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Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
The preferred way to generate user login in Polygon is to concatenate a prefix of the user's first name and a prefix of their last name, in that order. Each prefix must be non-empty, and any of the prefixes can be the full name. Typically there are multiple possible logins for each person.
You are given the first and the last name of a user. Return the alphabetically earliest login they can get (regardless of other potential Polygon users).
As a reminder, a prefix of a string s is its substring which occurs at the beginning of s: "a", "ab", "abc" etc. are prefixes of string "{abcdef}" but "b" and 'bc" are not. A string a is alphabetically earlier than a string b, if a is a prefix of b, or a and b coincide up to some position, and then a has a letter that is alphabetically earlier than the corresponding letter in b: "a" and "ab" are alphabetically earlier than "ac" but "b" and "ba" are alphabetically later than "ac".
Input
The input consists of a single line containing two space-separated strings: the first and the last names. Each character of each string is a lowercase English letter. The length of each string is between 1 and 10, inclusive.
Output
Output a single string — alphabetically earliest possible login formed from these names. The output should be given in lowercase as well.
Examples
Input
harry potter
Output
hap
Input
tom riddle
Output
tomr
Submitted Solution:
```
#list(map(int,input().split()))
#list(input().strip().split())
arr=list(input().strip().split())
s1=arr[0]
s2=arr[1]
ans=[s1[0]]
k=1
while k<len(s1):
if s1[k]>=s2[0]:
break
ans.append(s1[k])
k+=1
ans.append(s2[0])
print("".join(ans))
```
Yes
| 11,358
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
The preferred way to generate user login in Polygon is to concatenate a prefix of the user's first name and a prefix of their last name, in that order. Each prefix must be non-empty, and any of the prefixes can be the full name. Typically there are multiple possible logins for each person.
You are given the first and the last name of a user. Return the alphabetically earliest login they can get (regardless of other potential Polygon users).
As a reminder, a prefix of a string s is its substring which occurs at the beginning of s: "a", "ab", "abc" etc. are prefixes of string "{abcdef}" but "b" and 'bc" are not. A string a is alphabetically earlier than a string b, if a is a prefix of b, or a and b coincide up to some position, and then a has a letter that is alphabetically earlier than the corresponding letter in b: "a" and "ab" are alphabetically earlier than "ac" but "b" and "ba" are alphabetically later than "ac".
Input
The input consists of a single line containing two space-separated strings: the first and the last names. Each character of each string is a lowercase English letter. The length of each string is between 1 and 10, inclusive.
Output
Output a single string — alphabetically earliest possible login formed from these names. The output should be given in lowercase as well.
Examples
Input
harry potter
Output
hap
Input
tom riddle
Output
tomr
Submitted Solution:
```
a, b = input().split(' ')
for i in a[1:]:
if i >= b[0]:
i = a.find(i)
break
else:
i = None
# print(i)
if i == 0:
print(a[0],b[0], sep='')
else:
print(a[:i], b[0], sep='')
```
Yes
| 11,359
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
The preferred way to generate user login in Polygon is to concatenate a prefix of the user's first name and a prefix of their last name, in that order. Each prefix must be non-empty, and any of the prefixes can be the full name. Typically there are multiple possible logins for each person.
You are given the first and the last name of a user. Return the alphabetically earliest login they can get (regardless of other potential Polygon users).
As a reminder, a prefix of a string s is its substring which occurs at the beginning of s: "a", "ab", "abc" etc. are prefixes of string "{abcdef}" but "b" and 'bc" are not. A string a is alphabetically earlier than a string b, if a is a prefix of b, or a and b coincide up to some position, and then a has a letter that is alphabetically earlier than the corresponding letter in b: "a" and "ab" are alphabetically earlier than "ac" but "b" and "ba" are alphabetically later than "ac".
Input
The input consists of a single line containing two space-separated strings: the first and the last names. Each character of each string is a lowercase English letter. The length of each string is between 1 and 10, inclusive.
Output
Output a single string — alphabetically earliest possible login formed from these names. The output should be given in lowercase as well.
Examples
Input
harry potter
Output
hap
Input
tom riddle
Output
tomr
Submitted Solution:
```
a,b=input().split()
s=[]
for i in range(1,len(a)+1):
for j in range(1,len(b)+1):
s.append(a[:i]+b[:j])
s.sort()
print(s[0])
```
Yes
| 11,360
|
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0.82666015625,
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
The preferred way to generate user login in Polygon is to concatenate a prefix of the user's first name and a prefix of their last name, in that order. Each prefix must be non-empty, and any of the prefixes can be the full name. Typically there are multiple possible logins for each person.
You are given the first and the last name of a user. Return the alphabetically earliest login they can get (regardless of other potential Polygon users).
As a reminder, a prefix of a string s is its substring which occurs at the beginning of s: "a", "ab", "abc" etc. are prefixes of string "{abcdef}" but "b" and 'bc" are not. A string a is alphabetically earlier than a string b, if a is a prefix of b, or a and b coincide up to some position, and then a has a letter that is alphabetically earlier than the corresponding letter in b: "a" and "ab" are alphabetically earlier than "ac" but "b" and "ba" are alphabetically later than "ac".
Input
The input consists of a single line containing two space-separated strings: the first and the last names. Each character of each string is a lowercase English letter. The length of each string is between 1 and 10, inclusive.
Output
Output a single string — alphabetically earliest possible login formed from these names. The output should be given in lowercase as well.
Examples
Input
harry potter
Output
hap
Input
tom riddle
Output
tomr
Submitted Solution:
```
#909A
p,s = input().split(" ")
l = p[0]
for i in p[1:]:
if i > s[0]:
break
else:
l += i
print(l + s[0])
```
No
| 11,361
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
The preferred way to generate user login in Polygon is to concatenate a prefix of the user's first name and a prefix of their last name, in that order. Each prefix must be non-empty, and any of the prefixes can be the full name. Typically there are multiple possible logins for each person.
You are given the first and the last name of a user. Return the alphabetically earliest login they can get (regardless of other potential Polygon users).
As a reminder, a prefix of a string s is its substring which occurs at the beginning of s: "a", "ab", "abc" etc. are prefixes of string "{abcdef}" but "b" and 'bc" are not. A string a is alphabetically earlier than a string b, if a is a prefix of b, or a and b coincide up to some position, and then a has a letter that is alphabetically earlier than the corresponding letter in b: "a" and "ab" are alphabetically earlier than "ac" but "b" and "ba" are alphabetically later than "ac".
Input
The input consists of a single line containing two space-separated strings: the first and the last names. Each character of each string is a lowercase English letter. The length of each string is between 1 and 10, inclusive.
Output
Output a single string — alphabetically earliest possible login formed from these names. The output should be given in lowercase as well.
Examples
Input
harry potter
Output
hap
Input
tom riddle
Output
tomr
Submitted Solution:
```
f,l = input().split(' ')
ans =''
ans+=f[0]
i = 1
j = 0
while(True):
if(i==len(f)):
ans+=l[j]
break
x = ord(f[i])
y = ord(l[j])
if(x<=y):
ans+=f[i]
i+=1
else:
ans+=l[j]
break
print(ans)
```
No
| 11,362
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
The preferred way to generate user login in Polygon is to concatenate a prefix of the user's first name and a prefix of their last name, in that order. Each prefix must be non-empty, and any of the prefixes can be the full name. Typically there are multiple possible logins for each person.
You are given the first and the last name of a user. Return the alphabetically earliest login they can get (regardless of other potential Polygon users).
As a reminder, a prefix of a string s is its substring which occurs at the beginning of s: "a", "ab", "abc" etc. are prefixes of string "{abcdef}" but "b" and 'bc" are not. A string a is alphabetically earlier than a string b, if a is a prefix of b, or a and b coincide up to some position, and then a has a letter that is alphabetically earlier than the corresponding letter in b: "a" and "ab" are alphabetically earlier than "ac" but "b" and "ba" are alphabetically later than "ac".
Input
The input consists of a single line containing two space-separated strings: the first and the last names. Each character of each string is a lowercase English letter. The length of each string is between 1 and 10, inclusive.
Output
Output a single string — alphabetically earliest possible login formed from these names. The output should be given in lowercase as well.
Examples
Input
harry potter
Output
hap
Input
tom riddle
Output
tomr
Submitted Solution:
```
n = input().strip().split()
minVal = n[0][0]
index = 0
for i in range(1, len(n[0])):
if ord(n[0][i]) < ord(minVal):
minVal = n[0][i]
index = i
output = ''
for j in range(index + 1):
output += n[0][j]
output += n[1][0]
print(output)
```
No
| 11,364
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Tags: implementation, strings
Correct Solution:
```
import sys
s=input()
t=input()
st1=[]
st2=[]
checked=[]
right=[]
for i in range(len(s)):
a=[]
if s[i] in checked and t[i] not in checked:
print('-1')
sys.exit()
if s[i] not in checked and t[i] in checked:
print('-1')
sys.exit()
if s[i] in right and t[i] not in right:
print('-1')
sys.exit()
if s[i] not in right and t[i] in right:
print('-1')
sys.exit()
if s[i] not in st1 and s[i] not in st2:
if t[i] not in st1 and t[i] not in st2:
if s[i]!=t[i]:
checked.append(s[i])
checked.append(t[i])
st1.append(s[i])
st2.append(t[i])
else:
right.append(s[i])
right.append(t[i])
if s[i]==t[i]:
if s[i] in st1 or s[i] in st2:
print('-1')
sys.exit()
elif t[i] in st1 or t[i] in st2:
print('-1')
sys.exit()
if s[i] in st2:
if st1[st2.index(s[i])]!=t[i]:
print('-1')
sys.exit()
if s[i] in right or t[i] in right:
if s[i]!=t[i]:
print('-1')
sys.exit()
print(len(st1))
for i in range(len(st1)):
print(st1[i],end=" ")
print(st2[i])
```
| 12,130
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Tags: implementation, strings
Correct Solution:
```
a = input()
b = input()
alph = [0] * 26
for i in range(26):
alph[i] = chr(97 + i)
ans = []
for i in range(len(a)):
if a[i] != alph[ord(b[i]) - 97]:
if (alph[ord(a[i]) - 97] == a[i]) and (alph[ord(b[i]) - 97] == b[i]):
alph[ord(a[i]) - 97] = b[i]
alph[ord(b[i]) - 97] = a[i]
ans.append((a[i], b[i]))
else:
print(-1)
exit()
for i in range(len(b)):
if a[i] != alph[ord(b[i]) - 97]:
print(-1)
exit()
print(len(ans))
for i in range(len(ans)):
print(ans[i][0], ans[i][1])
```
| 12,131
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Tags: implementation, strings
Correct Solution:
```
def areBidirectionalDictionaries(s1, s2):
d = {}
other = {}
perfect = set()
for i, j in zip(s1, s2):
if i != j:
if (i in d and d[i] != j) or (j in d and d[j] != i) or (i in perfect) or (j in perfect):
print('-1')
return
if j not in d:
d[i] = j
other[j] = i
elif (i in d) or (i in other):
print('-1')
return
else:
perfect.add(i)
if len(d) != len(set(d.values())):
print('-1')
return
print(len(d))
for i, j in d.items():
print(str(i)+' '+str(j))
s1 = input()
s2 = input()
areBidirectionalDictionaries(s1, s2)
```
| 12,132
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Tags: implementation, strings
Correct Solution:
```
s = input()
t = input()
used, ln = set(), 0
for i in range(len(s)):
if (s[i] != t[i]) and (not (tuple(sorted([s[i], t[i]])) in used)):
ln += 1
used.add(tuple(sorted([s[i], t[i]])))
a = [i[0] for i in used]
b = [i[1] for i in used]
if s=='bd' and t=='cc':
print(-1)
elif len(a) != len(set(a)) or len(b) != len(set(b)):
print(-1)
elif len(a) == 0:
print(0)
else:
print(ln)
for i in used:
if i[0] != i[1]:
print(i[0], i[1])
```
| 12,133
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Tags: implementation, strings
Correct Solution:
```
def ic(s,t):
"""is correct"""
d=dict()
for c in range(len(s)):
if t[c] not in d or t[c] in d and s[c] not in d[t[c]]:
d.setdefault(s[c],set()).add(t[c])
d.setdefault(t[c],set()).add(s[c])
#print(d)
for k,v in d.items():
if len(v)>1:
return 0,None
d[k]=list(v)[0]
#print(d)
k,v=list(d.keys()),list(d.values())
#print(k,v)
sk,sv=set(k),set(v)
b=len(k)==len(sk) and len(v)==len(sv)
rv=set()
for k,v in d.items():
if k!=v and (v,k) not in rv:
rv.add((k,v))
return b,list(rv)
s,t=[input() for c in range(2)]
b,v=ic(s,t)
if b:
print(len(v))
for c in v:
print(c[0],c[1])
else:
print(-1)
```
| 12,134
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Tags: implementation, strings
Correct Solution:
```
def main():
d = {}
for a, b in zip(input(), input()):
if d.get(a, b) != b or d.get(b, a) != a:
print(-1)
return
d[a], d[b] = b, a
res = ['%s %s' % (a, b) for a, b in d.items() if a < b]
print(len(res))
print('\n'.join(res))
if __name__ == '__main__':
main()
```
| 12,135
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Tags: implementation, strings
Correct Solution:
```
s1 = input()
s2 = input()
a = [[0]*2 for i in range(29)]
used = [-1]*29
good = 1
c = 0
for i in range(len(s2)):
if good == 0:
break
if s2[i] != s1[i]:
if used[ord(s2[i])- ord('a')] == -1 and used[ord(s1[i])- ord('a')] == -1:
used[ord(s2[i])- ord('a')] = ord(s1[i])- ord('a')
used[ord(s1[i])- ord('a')] = ord(s2[i])- ord('a')
a[c][0] = s1[i]
a[c][1] = s2[i]
c += 1
elif used[ord(s2[i])- ord('a')] != ord(s1[i])- ord('a'):
good = 0
else:
if used[ord(s2[i])- ord('a')] == -1 :
used[ord(s2[i])- ord('a')] = ord(s1[i])- ord('a')
elif used[ord(s2[i])- ord('a')] != ord(s1[i])- ord('a'):
good = 0
if good == 0:
print(-1)
else:
print (c)
for i in range(c):
print(a[i][0], a[i][1])
```
| 12,136
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Tags: implementation, strings
Correct Solution:
```
before = input()
after = input()
length = len(before)
stock = {}
answer = []
for l in range(length):
if before[l] != after[l] and stock.get(after[l],0) == 0 and stock.get(before[l],0) == 0:
answer.append(str(before[l]) + " " + str(after[l]))
stock[before[l]] = after[l]
stock[after[l]] = before[l]
elif before[l] != after[l] and (stock.get(after[l],0) == -1 or stock.get(before[l],0) == -1):
print(-1)
break
elif before[l] != after[l]:
if stock.get(before[l],0) != after[l] or stock.get(after[l],0) != before[l]:
print(-1)
break
else:
continue
elif before[l] == after[l] and (stock.get(after[l],0) not in (0,-1) or stock.get(before[l],0) not in (0,-1)):
print(-1)
break
else:
stock[before[l]] = -1
stock[after[l]] = -1
else:
anslen = len(answer)
print(anslen)
for a in answer:
print(a)
```
| 12,137
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Submitted Solution:
```
s = input()
s1 = input()
mistake = False
d = dict()
ans = []
for i in range(len(s)):
if s[i] != s1[i]:
if s[i] in d and s1[i] in d:
if not (d[s[i]] == s1[i] and d[s1[i]] == s[i]):
mistake = True
break
elif s[i] in d or s1[i] in d:
mistake = True
break
else:
d[s[i]] = s1[i]
d[s1[i]] = s[i]
else:
if s[i] in d and d[s[i]] != s[i]:
mistake = True
break
d[s[i]] = s[i]
if mistake:
print(-1)
else:
ans = []
last = set()
for elem in d:
if elem not in last and elem != d[elem]:
ans.append([elem, d[elem]])
last.add(elem)
last.add(d[elem])
print(len(ans))
for elem in ans:
print(*elem)
```
Yes
| 12,138
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Submitted Solution:
```
s1, s2 = input(), input()
n = len(s1)
d = dict()
for i in range(n):
a = s1[i]
b = s2[i]
if b < a:
a, b = b, a
if a not in d and b not in d:
d[a] = b
d[b] = a
elif ((a in d and b not in d) or (a not in d and b in d)):
print(-1)
break
elif d[a] != b or d[b] != a:
print(-1)
break
else:
k = []
for i in d.items():
if i[0] < i[1]:
k.append('{} {}'.format(i[0], i[1]))
print(len(k))
print(*k, sep='\n')
```
Yes
| 12,139
|
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|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Submitted Solution:
```
s = input()
s1 = input()
q = set()
z =set()
flag=0
for i in range(len(s)):
if(s[i]!=s1[i] and (s1[i],s[i]) not in q and (s[i],s1[i])not in q):
q.add((s[i],s1[i]))
if(s[i] in z or s1[i] in z):
flag = 1
z.add(s[i])
z.add(s1[i])
for i in range(len(s)):
if(s[i]==s1[i] and s[i] in z):
flag = 1
if(flag):
print(-1)
else:
print(len(q))
for item in q:
print(item[0],item[1])
```
Yes
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Submitted Solution:
```
#k=int(input())
#n,m=map(int,input().split())
#a=list(map(int,input().split()))
#b=list(map(int,input().split()))
a=input()
b=input()
l=len(a)
d=set()
d2=set()
deg=dict()
for i in range(l):
if a[i]==b[i]:
d2.add(a[i])
deg[a[i]]=0
deg[b[i]]=0
for i in range(l):
if a[i]!=b[i]:
if a[i] in d2 or b[i] in d2:
print("-1")
quit()
if (not (a[i],b[i]) in d and not (b[i],a[i]) in d):
d.add((a[i],b[i]))
deg[a[i]]+=1
deg[b[i]]+=1
for i in d:
if deg[i[0]]>1 or deg[i[1]]>1:
print("-1")
quit()
print(len(d))
for i in d:
print(str(i[0]),'',str(i[1]))
```
Yes
| 12,141
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Submitted Solution:
```
s=input()
t=input()
num=len(s)
pair1=[0]*num
for i in range (num):
pair1[i]=[0]*2
def check(s,t,num):
arr=[0]*256
count=0
countie=0
for i in range (num):
if s[i] !=t[i]:
if (arr[ord(s[i])]>0 or arr[ord(t[i])]>0):
yy=0
for k in range (num):
if (pair1[k][0]==s[i] and pair1[k][1]==t[i]) or (pair1[k][1]==s[i] and pair1[k][0]==t[i]):
yy+=1
if yy==0:
return (-1)
else:
arr[ord(s[i])]+=1
arr[ord(t[i])]+=1
pair1[count][0]=s[i]
pair1[count][1]=t[i]
count+=1
countie+=1
return (countie)
ans=check(s,t,num)
if ans==-1 or ans==0:
print (ans)
else:
print (ans)
for p in range (ans):
print (pair1[p][0],pair1[p][1])
```
No
| 12,142
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Submitted Solution:
```
s = input()
t = input()
d = {}
p = {}
end = 0
for i in range(len(s)) :
if s[i] != t[i] :
if (s[i] in p ) or (t[i] in p) :
end = 1
else :
test = 0
for el in d :
if (el[0] == s[i] and el[1] == t[i]) or (el[1] == s[i] and el[0] == t[i]) :
test = 1
break
elif (s[i] == el[0] and t[i] != el[1]) or (t[i] == el[1] and s[i] != el[0]) or( (s[i] == el[1] and t[i] != el[0])) or (t[i] == el[0] and s[i] != el[1]) :
test = 1
end = 1
break
if test == 0 :
d[(s[i],t[i])] = 1
else :
p[s[i]] = 1
if end == 1 :
break
if end == 1 :
print(-1)
else :
print(len(d))
for el in d :
print(*[el[0],el[1]],sep =' ')
```
No
| 12,143
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Submitted Solution:
```
import traceback
import math
from collections import defaultdict
from functools import lru_cache
import os
import sys
from io import BytesIO, IOBase
BUFSIZE = 8192
class FastIO(IOBase):
newlines = 0
def __init__(self, file):
self._fd = file.fileno()
self.buffer = BytesIO()
self.writable = "x" in file.mode or "r" not in file.mode
self.write = self.buffer.write if self.writable else None
def read(self):
while True:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
if not b:
break
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines = 0
return self.buffer.read()
def readline(self):
while self.newlines == 0:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
self.newlines = b.count(b"\n") + (not b)
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines -= 1
return self.buffer.readline()
def flush(self):
if self.writable:
os.write(self._fd, self.buffer.getvalue())
self.buffer.truncate(0), self.buffer.seek(0)
class IOWrapper(IOBase):
def __init__(self, file):
self.buffer = FastIO(file)
self.flush = self.buffer.flush
self.writable = self.buffer.writable
self.write = lambda s: self.buffer.write(s.encode("ascii"))
self.read = lambda: self.buffer.read().decode("ascii")
self.readline = lambda: self.buffer.readline().decode("ascii")
sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")
def geti():
return int(input())
def gets():
return input()
def getil():
return list(map(int, input().split()))
def getsl():
return input().split()
def get2d(nrows, ncols, n=0):
return [[n] * ncols for r in range(nrows)]
# sys.stdin = open('input.txt', 'r')
# sys.stdout = open('output.txt', 'w')
inf = float('inf')
mod = 10 ** 9 + 7
def main():
T = gets()
S = gets()
pairs = {}
ans = []
for s, t in zip(S, T):
if s == t:
if s in pairs:
return -1
elif s in pairs:
if s != pairs[t]: return -1
else:
pairs[s] = t
pairs[t] = s
ans.append([s, t])
return ans
try:
ans = main()
if ans == -1:
print(-1)
else:
print(len(ans))
# ans = 'Yes' if ans else 'No'
for i in ans:
print(*i)
except Exception as e:
traceback.print_exc()
```
No
| 12,144
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|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he suddenly realized that some pairs of keys took each other's place! That is, Santa suspects that each key is either on its place, or on the place of another key, which is located exactly where the first key should be.
In order to make sure that he's right and restore the correct order of keys, Santa typed his favorite patter looking only to his keyboard.
You are given the Santa's favorite patter and the string he actually typed. Determine which pairs of keys could be mixed. Each key must occur in pairs at most once.
Input
The input consists of only two strings s and t denoting the favorite Santa's patter and the resulting string. s and t are not empty and have the same length, which is at most 1000. Both strings consist only of lowercase English letters.
Output
If Santa is wrong, and there is no way to divide some of keys into pairs and swap keys in each pair so that the keyboard will be fixed, print «-1» (without quotes).
Otherwise, the first line of output should contain the only integer k (k ≥ 0) — the number of pairs of keys that should be swapped. The following k lines should contain two space-separated letters each, denoting the keys which should be swapped. All printed letters must be distinct.
If there are several possible answers, print any of them. You are free to choose the order of the pairs and the order of keys in a pair.
Each letter must occur at most once. Santa considers the keyboard to be fixed if he can print his favorite patter without mistakes.
Examples
Input
helloworld
ehoolwlroz
Output
3
h e
l o
d z
Input
hastalavistababy
hastalavistababy
Output
0
Input
merrychristmas
christmasmerry
Output
-1
Submitted Solution:
```
# cook your dish here
import sys
s=input()
t=input()
set1=[]
set2=[]
right=[]
for i in range(len(s)):
if s[i]==t[i]:
right.append(s[i])
else:
if s[i] in set1 and t[i] in set2:
if set1.index(s[i])==set2.index(t[i]):
pass
else:
print('-1')
sys.exit()
elif s[i] in set1 and t[i] not in set2:
print(-1)
sys.exit()
elif s[i] not in set1 and t[i] in set2:
print('-1')
sys.exit()
else:
if s[i] not in set1 and s[i] not in set2:
if t[i] not in set1 and t[i] not in set2:
set1.append(s[i])
set2.append(t[i])
else:
print(-1)
sys.exit()
if s[i] in right or t[i] in right:
print(-1)
sys.exit()
print(len(set1))
for i in range(len(set1)):
print(set1[i],end=" ")
print(set2[i])
```
No
| 12,145
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Note that the only difference between String Transformation 1 and String Transformation 2 is in the move Koa does. In this version the letter y Koa selects must be strictly greater alphabetically than x (read statement for better understanding). You can make hacks in these problems independently.
Koa the Koala has two strings A and B of the same length n (|A|=|B|=n) consisting of the first 20 lowercase English alphabet letters (ie. from a to t).
In one move Koa:
1. selects some subset of positions p_1, p_2, …, p_k (k ≥ 1; 1 ≤ p_i ≤ n; p_i ≠ p_j if i ≠ j) of A such that A_{p_1} = A_{p_2} = … = A_{p_k} = x (ie. all letters on this positions are equal to some letter x).
2. selects a letter y (from the first 20 lowercase letters in English alphabet) such that y>x (ie. letter y is strictly greater alphabetically than x).
3. sets each letter in positions p_1, p_2, …, p_k to letter y. More formally: for each i (1 ≤ i ≤ k) Koa sets A_{p_i} = y.
Note that you can only modify letters in string A.
Koa wants to know the smallest number of moves she has to do to make strings equal to each other (A = B) or to determine that there is no way to make them equal. Help her!
Input
Each test contains multiple test cases. The first line contains t (1 ≤ t ≤ 10) — the number of test cases. Description of the test cases follows.
The first line of each test case contains one integer n (1 ≤ n ≤ 10^5) — the length of strings A and B.
The second line of each test case contains string A (|A|=n).
The third line of each test case contains string B (|B|=n).
Both strings consists of the first 20 lowercase English alphabet letters (ie. from a to t).
It is guaranteed that the sum of n over all test cases does not exceed 10^5.
Output
For each test case:
Print on a single line the smallest number of moves she has to do to make strings equal to each other (A = B) or -1 if there is no way to make them equal.
Example
Input
5
3
aab
bcc
4
cabc
abcb
3
abc
tsr
4
aabd
cccd
5
abcbd
bcdda
Output
2
-1
3
2
-1
Note
* In the 1-st test case Koa:
1. selects positions 1 and 2 and sets A_1 = A_2 = b (\color{red}{aa}b → \color{blue}{bb}b).
2. selects positions 2 and 3 and sets A_2 = A_3 = c (b\color{red}{bb} → b\color{blue}{cc}).
* In the 2-nd test case Koa has no way to make string A equal B.
* In the 3-rd test case Koa:
1. selects position 1 and sets A_1 = t (\color{red}{a}bc → \color{blue}{t}bc).
2. selects position 2 and sets A_2 = s (t\color{red}{b}c → t\color{blue}{s}c).
3. selects position 3 and sets A_3 = r (ts\color{red}{c} → ts\color{blue}{r}).
Tags: dsu, graphs, greedy, sortings, strings, trees, two pointers
Correct Solution:
```
"""Template for Python Competitive Programmers prepared by pajengod and many others """
# ////////// SHUBHAM SHARMA \\\\\\\\\\\\\
# to use the print and division function of Python3
from __future__ import division, print_function
"""value of mod"""
MOD = 998244353
mod = 10 ** 9 + 7
"""use resource"""
# import resource
# resource.setrlimit(resource.RLIMIT_STACK, [0x100000000, resource.RLIM_INFINITY])
"""for factorial"""
def prepare_factorial():
fact = [1]
for i in range(1, 100005):
fact.append((fact[-1] * i) % mod)
ifact = [0] * 100005
ifact[100004] = pow(fact[100004], mod - 2, mod)
for i in range(100004, 0, -1):
ifact[i - 1] = (i * ifact[i]) % mod
return fact, ifact
"""uncomment next 4 lines while doing recursion based question"""
# import threading
# threading.stack_size(1<<27)
import sys
# sys.setrecursionlimit(10000)
"""uncomment modules according to your need"""
from bisect import bisect_left, bisect_right, insort
# from itertools import repeat
from math import floor, ceil, sqrt, degrees, atan, pi, log, sin, radians
from heapq import heappop, heapify, heappush
# from random import randint as rn
# from Queue import Queue as Q
from collections import Counter, defaultdict, deque
# from copy import deepcopy
# from decimal import *
# import re
# import operator
def modinv(n, p):
return pow(n, p - 2, p)
def ncr(n, r, fact, ifact): # for using this uncomment the lines calculating fact and ifact
t = (fact[n] * (ifact[r] * ifact[n - r]) % mod) % mod
return t
def intarray(): return map(int, sys.stdin.readline().strip().split())
def array(): return list(map(int, sys.stdin.readline().strip().split()))
def input(): return sys.stdin.readline().strip()
"""*****************************************************************************************"""
def GCD(x, y):
while y:
x, y = y, x % y
return x
def lcm(x, y):
return (x * y) // (GCD(x, y))
def get_xor(n):
return [n, 1, n + 1, 0][n % 4]
def fast_expo(a, b):
res = 1
while b:
if b & 1:
res = (res * a)
res %= MOD
b -= 1
else:
a = (a * a)
a %= MOD
b >>= 1
res %= MOD
return res
def get_n(P): # this function returns the maximum n for which Summation(n) <= Sum
ans = (-1 + sqrt(1 + 8 * P)) // 2
return ans
""" ********************************************************************************************* """
"""
array() # for araay
intarray() # for map array
SAMPLE INPUT HERE
5
2
01
10
5
01011
11100
2
01
01
10
0110011011
1000110100
1
0
1
"""
""" OM SAI RAM """
def solve():
n= int(input())
a= list(input())
b= input()
ans= 0
for i in range(20):
x ='z'
for j in range(n):
if a[j]==chr(97+i):
if a[j]>b[j]:
flag = 0
print(-1)
return
elif a[j]==b[j]:
continue
else:
x = min(x,b[j])
if x=='z':
continue
for k in range(n):
if a[k]==chr(97+i) and a[k]!=b[k]:
a[k] = x
ans+=1
print(ans)
return
def main():
T = int(input())
while T:
solve()
T -= 1
"""OM SAI RAM """
""" -------- Python 2 and 3 footer by Pajenegod and c1729 ---------"""
py2 = round(0.5)
if py2:
from future_builtins import ascii, filter, hex, map, oct, zip
range = xrange
import os, sys
from io import IOBase, BytesIO
BUFSIZE = 8192
class FastIO(BytesIO):
newlines = 0
def __init__(self, file):
self._file = file
self._fd = file.fileno()
self.writable = "x" in file.mode or "w" in file.mode
self.write = super(FastIO, self).write if self.writable else None
def _fill(self):
s = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
self.seek((self.tell(), self.seek(0, 2), super(FastIO, self).write(s))[0])
return s
def read(self):
while self._fill(): pass
return super(FastIO, self).read()
def readline(self):
while self.newlines == 0:
s = self._fill();
self.newlines = s.count(b"\n") + (not s)
self.newlines -= 1
return super(FastIO, self).readline()
def flush(self):
if self.writable:
os.write(self._fd, self.getvalue())
self.truncate(0), self.seek(0)
class IOWrapper(IOBase):
def __init__(self, file):
self.buffer = FastIO(file)
self.flush = self.buffer.flush
self.writable = self.buffer.writable
if py2:
self.write = self.buffer.write
self.read = self.buffer.read
self.readline = self.buffer.readline
else:
self.write = lambda s: self.buffer.write(s.encode('ascii'))
self.read = lambda: self.buffer.read().decode('ascii')
self.readline = lambda: self.buffer.readline().decode('ascii')
sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip('\r\n')
# sys.stdin = open('input.txt', 'r')
# sys.stdout = open('output.txt', 'w')
""" main function"""
if __name__ == '__main__':
main()
# threading.Thread(target=main).start()
```
| 12,618
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Note that the only difference between String Transformation 1 and String Transformation 2 is in the move Koa does. In this version the letter y Koa selects must be strictly greater alphabetically than x (read statement for better understanding). You can make hacks in these problems independently.
Koa the Koala has two strings A and B of the same length n (|A|=|B|=n) consisting of the first 20 lowercase English alphabet letters (ie. from a to t).
In one move Koa:
1. selects some subset of positions p_1, p_2, …, p_k (k ≥ 1; 1 ≤ p_i ≤ n; p_i ≠ p_j if i ≠ j) of A such that A_{p_1} = A_{p_2} = … = A_{p_k} = x (ie. all letters on this positions are equal to some letter x).
2. selects a letter y (from the first 20 lowercase letters in English alphabet) such that y>x (ie. letter y is strictly greater alphabetically than x).
3. sets each letter in positions p_1, p_2, …, p_k to letter y. More formally: for each i (1 ≤ i ≤ k) Koa sets A_{p_i} = y.
Note that you can only modify letters in string A.
Koa wants to know the smallest number of moves she has to do to make strings equal to each other (A = B) or to determine that there is no way to make them equal. Help her!
Input
Each test contains multiple test cases. The first line contains t (1 ≤ t ≤ 10) — the number of test cases. Description of the test cases follows.
The first line of each test case contains one integer n (1 ≤ n ≤ 10^5) — the length of strings A and B.
The second line of each test case contains string A (|A|=n).
The third line of each test case contains string B (|B|=n).
Both strings consists of the first 20 lowercase English alphabet letters (ie. from a to t).
It is guaranteed that the sum of n over all test cases does not exceed 10^5.
Output
For each test case:
Print on a single line the smallest number of moves she has to do to make strings equal to each other (A = B) or -1 if there is no way to make them equal.
Example
Input
5
3
aab
bcc
4
cabc
abcb
3
abc
tsr
4
aabd
cccd
5
abcbd
bcdda
Output
2
-1
3
2
-1
Note
* In the 1-st test case Koa:
1. selects positions 1 and 2 and sets A_1 = A_2 = b (\color{red}{aa}b → \color{blue}{bb}b).
2. selects positions 2 and 3 and sets A_2 = A_3 = c (b\color{red}{bb} → b\color{blue}{cc}).
* In the 2-nd test case Koa has no way to make string A equal B.
* In the 3-rd test case Koa:
1. selects position 1 and sets A_1 = t (\color{red}{a}bc → \color{blue}{t}bc).
2. selects position 2 and sets A_2 = s (t\color{red}{b}c → t\color{blue}{s}c).
3. selects position 3 and sets A_3 = r (ts\color{red}{c} → ts\color{blue}{r}).
Tags: dsu, graphs, greedy, sortings, strings, trees, two pointers
Correct Solution:
```
import sys
input = sys.stdin.readline
class UnionFind:
def __init__(self, n):
self.parent = [-1] * n
self.cnt = n
def root(self, x):
if self.parent[x] < 0:
return x
else:
self.parent[x] = self.root(self.parent[x])
return self.parent[x]
def merge(self, x, y):
x = self.root(x)
y = self.root(y)
if x == y:
return
if self.parent[x] > self.parent[y]:
x, y = y, x
self.parent[x] += self.parent[y]
self.parent[y] = x
self.cnt -= 1
def is_same(self, x, y):
return self.root(x) == self.root(y)
def get_size(self, x):
return -self.parent[self.root(x)]
def get_cnt(self):
return self.cnt
t = int(input())
alph = "abcdefghijklmnopqrstuvwxyz"
to_ind = {char: i for i, char in enumerate(alph)}
for _ in range(t):
n = int(input())
a = list(input())
b = list(input())
flag = False
for i in range(n):
if a[i] > b[i]:
print(-1)
flag = True
break
if flag:
continue
uf = UnionFind(26)
for i in range(n):
u = to_ind[a[i]]
v = to_ind[b[i]]
uf.merge(u, v)
print(26 - uf.get_cnt())
```
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Note that the only difference between String Transformation 1 and String Transformation 2 is in the move Koa does. In this version the letter y Koa selects must be strictly greater alphabetically than x (read statement for better understanding). You can make hacks in these problems independently.
Koa the Koala has two strings A and B of the same length n (|A|=|B|=n) consisting of the first 20 lowercase English alphabet letters (ie. from a to t).
In one move Koa:
1. selects some subset of positions p_1, p_2, …, p_k (k ≥ 1; 1 ≤ p_i ≤ n; p_i ≠ p_j if i ≠ j) of A such that A_{p_1} = A_{p_2} = … = A_{p_k} = x (ie. all letters on this positions are equal to some letter x).
2. selects a letter y (from the first 20 lowercase letters in English alphabet) such that y>x (ie. letter y is strictly greater alphabetically than x).
3. sets each letter in positions p_1, p_2, …, p_k to letter y. More formally: for each i (1 ≤ i ≤ k) Koa sets A_{p_i} = y.
Note that you can only modify letters in string A.
Koa wants to know the smallest number of moves she has to do to make strings equal to each other (A = B) or to determine that there is no way to make them equal. Help her!
Input
Each test contains multiple test cases. The first line contains t (1 ≤ t ≤ 10) — the number of test cases. Description of the test cases follows.
The first line of each test case contains one integer n (1 ≤ n ≤ 10^5) — the length of strings A and B.
The second line of each test case contains string A (|A|=n).
The third line of each test case contains string B (|B|=n).
Both strings consists of the first 20 lowercase English alphabet letters (ie. from a to t).
It is guaranteed that the sum of n over all test cases does not exceed 10^5.
Output
For each test case:
Print on a single line the smallest number of moves she has to do to make strings equal to each other (A = B) or -1 if there is no way to make them equal.
Example
Input
5
3
aab
bcc
4
cabc
abcb
3
abc
tsr
4
aabd
cccd
5
abcbd
bcdda
Output
2
-1
3
2
-1
Note
* In the 1-st test case Koa:
1. selects positions 1 and 2 and sets A_1 = A_2 = b (\color{red}{aa}b → \color{blue}{bb}b).
2. selects positions 2 and 3 and sets A_2 = A_3 = c (b\color{red}{bb} → b\color{blue}{cc}).
* In the 2-nd test case Koa has no way to make string A equal B.
* In the 3-rd test case Koa:
1. selects position 1 and sets A_1 = t (\color{red}{a}bc → \color{blue}{t}bc).
2. selects position 2 and sets A_2 = s (t\color{red}{b}c → t\color{blue}{s}c).
3. selects position 3 and sets A_3 = r (ts\color{red}{c} → ts\color{blue}{r}).
Tags: dsu, graphs, greedy, sortings, strings, trees, two pointers
Correct Solution:
```
import sys
input = sys.stdin.readline
I = lambda : list(map(int,input().split()))
def find(x):
while x!=p[x]:
x=p[x]
return x
def union(a,b):
x=find(a)
y=find(b)
if x!=y:
p[y]=p[x]=min(x,y)
r[min(x,y)]+=r[max(x,y)]
t,=I()
for _ in range(t):
n,=I()
a=input().strip()
b=input().strip()
p=[i for i in range(20)]
r=[1]*20
pos=1
for i in range(n):
if a[i]<b[i]:
union(ord(a[i])-97,ord(b[i])-97)
elif a[i]!=b[i]:
pos=0
break
if pos:
an=0
for i in range(20):
if p[i]==i:
an+=r[i]-1
print(an)
else:
print(-1)
```
| 12,620
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Note that the only difference between String Transformation 1 and String Transformation 2 is in the move Koa does. In this version the letter y Koa selects must be strictly greater alphabetically than x (read statement for better understanding). You can make hacks in these problems independently.
Koa the Koala has two strings A and B of the same length n (|A|=|B|=n) consisting of the first 20 lowercase English alphabet letters (ie. from a to t).
In one move Koa:
1. selects some subset of positions p_1, p_2, …, p_k (k ≥ 1; 1 ≤ p_i ≤ n; p_i ≠ p_j if i ≠ j) of A such that A_{p_1} = A_{p_2} = … = A_{p_k} = x (ie. all letters on this positions are equal to some letter x).
2. selects a letter y (from the first 20 lowercase letters in English alphabet) such that y>x (ie. letter y is strictly greater alphabetically than x).
3. sets each letter in positions p_1, p_2, …, p_k to letter y. More formally: for each i (1 ≤ i ≤ k) Koa sets A_{p_i} = y.
Note that you can only modify letters in string A.
Koa wants to know the smallest number of moves she has to do to make strings equal to each other (A = B) or to determine that there is no way to make them equal. Help her!
Input
Each test contains multiple test cases. The first line contains t (1 ≤ t ≤ 10) — the number of test cases. Description of the test cases follows.
The first line of each test case contains one integer n (1 ≤ n ≤ 10^5) — the length of strings A and B.
The second line of each test case contains string A (|A|=n).
The third line of each test case contains string B (|B|=n).
Both strings consists of the first 20 lowercase English alphabet letters (ie. from a to t).
It is guaranteed that the sum of n over all test cases does not exceed 10^5.
Output
For each test case:
Print on a single line the smallest number of moves she has to do to make strings equal to each other (A = B) or -1 if there is no way to make them equal.
Example
Input
5
3
aab
bcc
4
cabc
abcb
3
abc
tsr
4
aabd
cccd
5
abcbd
bcdda
Output
2
-1
3
2
-1
Note
* In the 1-st test case Koa:
1. selects positions 1 and 2 and sets A_1 = A_2 = b (\color{red}{aa}b → \color{blue}{bb}b).
2. selects positions 2 and 3 and sets A_2 = A_3 = c (b\color{red}{bb} → b\color{blue}{cc}).
* In the 2-nd test case Koa has no way to make string A equal B.
* In the 3-rd test case Koa:
1. selects position 1 and sets A_1 = t (\color{red}{a}bc → \color{blue}{t}bc).
2. selects position 2 and sets A_2 = s (t\color{red}{b}c → t\color{blue}{s}c).
3. selects position 3 and sets A_3 = r (ts\color{red}{c} → ts\color{blue}{r}).
Tags: dsu, graphs, greedy, sortings, strings, trees, two pointers
Correct Solution:
```
y=lambda s:ord(s)-97
z=lambda:list(map(y,input()))
for _ in range(int(input())):
n=int(input())
a,b=z(),z()
f,c=0,0
for i in range(20):
m=20
l=[]
for j in range(n):
if a[j]==i:
if b[j]<i:
f=1
break
elif b[j]>i:
m=min(m,b[j])
l.append(j)
if f:break
if m==20:continue
else:
c+=1
for j in l:a[j]=m
if f:print(-1)
else:print(c)
```
| 12,621
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Note that the only difference between String Transformation 1 and String Transformation 2 is in the move Koa does. In this version the letter y Koa selects must be strictly greater alphabetically than x (read statement for better understanding). You can make hacks in these problems independently.
Koa the Koala has two strings A and B of the same length n (|A|=|B|=n) consisting of the first 20 lowercase English alphabet letters (ie. from a to t).
In one move Koa:
1. selects some subset of positions p_1, p_2, …, p_k (k ≥ 1; 1 ≤ p_i ≤ n; p_i ≠ p_j if i ≠ j) of A such that A_{p_1} = A_{p_2} = … = A_{p_k} = x (ie. all letters on this positions are equal to some letter x).
2. selects a letter y (from the first 20 lowercase letters in English alphabet) such that y>x (ie. letter y is strictly greater alphabetically than x).
3. sets each letter in positions p_1, p_2, …, p_k to letter y. More formally: for each i (1 ≤ i ≤ k) Koa sets A_{p_i} = y.
Note that you can only modify letters in string A.
Koa wants to know the smallest number of moves she has to do to make strings equal to each other (A = B) or to determine that there is no way to make them equal. Help her!
Input
Each test contains multiple test cases. The first line contains t (1 ≤ t ≤ 10) — the number of test cases. Description of the test cases follows.
The first line of each test case contains one integer n (1 ≤ n ≤ 10^5) — the length of strings A and B.
The second line of each test case contains string A (|A|=n).
The third line of each test case contains string B (|B|=n).
Both strings consists of the first 20 lowercase English alphabet letters (ie. from a to t).
It is guaranteed that the sum of n over all test cases does not exceed 10^5.
Output
For each test case:
Print on a single line the smallest number of moves she has to do to make strings equal to each other (A = B) or -1 if there is no way to make them equal.
Example
Input
5
3
aab
bcc
4
cabc
abcb
3
abc
tsr
4
aabd
cccd
5
abcbd
bcdda
Output
2
-1
3
2
-1
Note
* In the 1-st test case Koa:
1. selects positions 1 and 2 and sets A_1 = A_2 = b (\color{red}{aa}b → \color{blue}{bb}b).
2. selects positions 2 and 3 and sets A_2 = A_3 = c (b\color{red}{bb} → b\color{blue}{cc}).
* In the 2-nd test case Koa has no way to make string A equal B.
* In the 3-rd test case Koa:
1. selects position 1 and sets A_1 = t (\color{red}{a}bc → \color{blue}{t}bc).
2. selects position 2 and sets A_2 = s (t\color{red}{b}c → t\color{blue}{s}c).
3. selects position 3 and sets A_3 = r (ts\color{red}{c} → ts\color{blue}{r}).
Tags: dsu, graphs, greedy, sortings, strings, trees, two pointers
Correct Solution:
```
from collections import defaultdict
import string
T = int(input())
for t in range(T):
n = int(input())
source = input()
target = input()
exit_flag = False
for i in range(n): # feasibility test
if target[i] < source[i]:
print(-1)
exit_flag = True
break
if exit_flag:
continue
d = defaultdict(set)
for i in range(n):
if source[i] != target[i]:
d[source[i]].add(target[i]) # need to process this
ans = 0
for i in string.ascii_lowercase:
if i in d:
if d[i]:
smallest_e = min(d[i])
d[min(d[i])] |= set([j for j in d[i] if j!= smallest_e])
ans += 1
print(ans)
```
| 12,622
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Note that the only difference between String Transformation 1 and String Transformation 2 is in the move Koa does. In this version the letter y Koa selects must be strictly greater alphabetically than x (read statement for better understanding). You can make hacks in these problems independently.
Koa the Koala has two strings A and B of the same length n (|A|=|B|=n) consisting of the first 20 lowercase English alphabet letters (ie. from a to t).
In one move Koa:
1. selects some subset of positions p_1, p_2, …, p_k (k ≥ 1; 1 ≤ p_i ≤ n; p_i ≠ p_j if i ≠ j) of A such that A_{p_1} = A_{p_2} = … = A_{p_k} = x (ie. all letters on this positions are equal to some letter x).
2. selects a letter y (from the first 20 lowercase letters in English alphabet) such that y>x (ie. letter y is strictly greater alphabetically than x).
3. sets each letter in positions p_1, p_2, …, p_k to letter y. More formally: for each i (1 ≤ i ≤ k) Koa sets A_{p_i} = y.
Note that you can only modify letters in string A.
Koa wants to know the smallest number of moves she has to do to make strings equal to each other (A = B) or to determine that there is no way to make them equal. Help her!
Input
Each test contains multiple test cases. The first line contains t (1 ≤ t ≤ 10) — the number of test cases. Description of the test cases follows.
The first line of each test case contains one integer n (1 ≤ n ≤ 10^5) — the length of strings A and B.
The second line of each test case contains string A (|A|=n).
The third line of each test case contains string B (|B|=n).
Both strings consists of the first 20 lowercase English alphabet letters (ie. from a to t).
It is guaranteed that the sum of n over all test cases does not exceed 10^5.
Output
For each test case:
Print on a single line the smallest number of moves she has to do to make strings equal to each other (A = B) or -1 if there is no way to make them equal.
Example
Input
5
3
aab
bcc
4
cabc
abcb
3
abc
tsr
4
aabd
cccd
5
abcbd
bcdda
Output
2
-1
3
2
-1
Note
* In the 1-st test case Koa:
1. selects positions 1 and 2 and sets A_1 = A_2 = b (\color{red}{aa}b → \color{blue}{bb}b).
2. selects positions 2 and 3 and sets A_2 = A_3 = c (b\color{red}{bb} → b\color{blue}{cc}).
* In the 2-nd test case Koa has no way to make string A equal B.
* In the 3-rd test case Koa:
1. selects position 1 and sets A_1 = t (\color{red}{a}bc → \color{blue}{t}bc).
2. selects position 2 and sets A_2 = s (t\color{red}{b}c → t\color{blue}{s}c).
3. selects position 3 and sets A_3 = r (ts\color{red}{c} → ts\color{blue}{r}).
Tags: dsu, graphs, greedy, sortings, strings, trees, two pointers
Correct Solution:
```
import sys
import math
def II():
return int(sys.stdin.readline())
def LI():
return list(map(int, sys.stdin.readline().split()))
def MI():
return map(int, sys.stdin.readline().split())
def SI():
return sys.stdin.readline().strip()
t = II()
for q in range(t):
n = II()
a = SI()
b = SI()
d = [[] for i in range(20)]
boo = True
for i in range(n):
if a[i]>b[i]:
boo = False
break
d[ord(a[i])-97].append(ord(b[i])-97)
d[ord(b[i])-97].append(ord(a[i])-97)
if boo == False:
print(-1)
else:
v = [0]*20
def dfs(ind):
v[ind] = 1
for i in d[ind]:
if v[i] == 0:
dfs(i)
ans = 20
for i in range(20):
if v[i] == 0:
dfs(i)
ans-=1
print(ans)
```
| 12,623
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Note that the only difference between String Transformation 1 and String Transformation 2 is in the move Koa does. In this version the letter y Koa selects must be strictly greater alphabetically than x (read statement for better understanding). You can make hacks in these problems independently.
Koa the Koala has two strings A and B of the same length n (|A|=|B|=n) consisting of the first 20 lowercase English alphabet letters (ie. from a to t).
In one move Koa:
1. selects some subset of positions p_1, p_2, …, p_k (k ≥ 1; 1 ≤ p_i ≤ n; p_i ≠ p_j if i ≠ j) of A such that A_{p_1} = A_{p_2} = … = A_{p_k} = x (ie. all letters on this positions are equal to some letter x).
2. selects a letter y (from the first 20 lowercase letters in English alphabet) such that y>x (ie. letter y is strictly greater alphabetically than x).
3. sets each letter in positions p_1, p_2, …, p_k to letter y. More formally: for each i (1 ≤ i ≤ k) Koa sets A_{p_i} = y.
Note that you can only modify letters in string A.
Koa wants to know the smallest number of moves she has to do to make strings equal to each other (A = B) or to determine that there is no way to make them equal. Help her!
Input
Each test contains multiple test cases. The first line contains t (1 ≤ t ≤ 10) — the number of test cases. Description of the test cases follows.
The first line of each test case contains one integer n (1 ≤ n ≤ 10^5) — the length of strings A and B.
The second line of each test case contains string A (|A|=n).
The third line of each test case contains string B (|B|=n).
Both strings consists of the first 20 lowercase English alphabet letters (ie. from a to t).
It is guaranteed that the sum of n over all test cases does not exceed 10^5.
Output
For each test case:
Print on a single line the smallest number of moves she has to do to make strings equal to each other (A = B) or -1 if there is no way to make them equal.
Example
Input
5
3
aab
bcc
4
cabc
abcb
3
abc
tsr
4
aabd
cccd
5
abcbd
bcdda
Output
2
-1
3
2
-1
Note
* In the 1-st test case Koa:
1. selects positions 1 and 2 and sets A_1 = A_2 = b (\color{red}{aa}b → \color{blue}{bb}b).
2. selects positions 2 and 3 and sets A_2 = A_3 = c (b\color{red}{bb} → b\color{blue}{cc}).
* In the 2-nd test case Koa has no way to make string A equal B.
* In the 3-rd test case Koa:
1. selects position 1 and sets A_1 = t (\color{red}{a}bc → \color{blue}{t}bc).
2. selects position 2 and sets A_2 = s (t\color{red}{b}c → t\color{blue}{s}c).
3. selects position 3 and sets A_3 = r (ts\color{red}{c} → ts\color{blue}{r}).
Tags: dsu, graphs, greedy, sortings, strings, trees, two pointers
Correct Solution:
```
t=int(input())
for _ in range(t):
n=int(input())
a=list(input())
b=list(input())
count=[[0 for i in range(20)] for i in range(20)]
flag=1
for i in range(n):
if(ord(a[i])>ord(b[i])):
flag=0
print(-1)
break
if(flag==0):
continue
ans=0
count=[[0 for i in range(20)] for i in range(20)]
for i in range(n):
count[ord(b[i])-97][ord(a[i])-97]+=1
#print(count)
for i in range(1,20):
counter=set()
for j in range(i):
if(count[i][j]>0):
counter.add(j)
ans+=1
for j in range(20):
jem=0
for k in range(i):
if(k in counter):
jem+=count[j][k]
count[j][k]=0
count[j][i]+=jem
#print(counter)
#print(count)
print(ans)
```
| 12,624
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Note that the only difference between String Transformation 1 and String Transformation 2 is in the move Koa does. In this version the letter y Koa selects must be strictly greater alphabetically than x (read statement for better understanding). You can make hacks in these problems independently.
Koa the Koala has two strings A and B of the same length n (|A|=|B|=n) consisting of the first 20 lowercase English alphabet letters (ie. from a to t).
In one move Koa:
1. selects some subset of positions p_1, p_2, …, p_k (k ≥ 1; 1 ≤ p_i ≤ n; p_i ≠ p_j if i ≠ j) of A such that A_{p_1} = A_{p_2} = … = A_{p_k} = x (ie. all letters on this positions are equal to some letter x).
2. selects a letter y (from the first 20 lowercase letters in English alphabet) such that y>x (ie. letter y is strictly greater alphabetically than x).
3. sets each letter in positions p_1, p_2, …, p_k to letter y. More formally: for each i (1 ≤ i ≤ k) Koa sets A_{p_i} = y.
Note that you can only modify letters in string A.
Koa wants to know the smallest number of moves she has to do to make strings equal to each other (A = B) or to determine that there is no way to make them equal. Help her!
Input
Each test contains multiple test cases. The first line contains t (1 ≤ t ≤ 10) — the number of test cases. Description of the test cases follows.
The first line of each test case contains one integer n (1 ≤ n ≤ 10^5) — the length of strings A and B.
The second line of each test case contains string A (|A|=n).
The third line of each test case contains string B (|B|=n).
Both strings consists of the first 20 lowercase English alphabet letters (ie. from a to t).
It is guaranteed that the sum of n over all test cases does not exceed 10^5.
Output
For each test case:
Print on a single line the smallest number of moves she has to do to make strings equal to each other (A = B) or -1 if there is no way to make them equal.
Example
Input
5
3
aab
bcc
4
cabc
abcb
3
abc
tsr
4
aabd
cccd
5
abcbd
bcdda
Output
2
-1
3
2
-1
Note
* In the 1-st test case Koa:
1. selects positions 1 and 2 and sets A_1 = A_2 = b (\color{red}{aa}b → \color{blue}{bb}b).
2. selects positions 2 and 3 and sets A_2 = A_3 = c (b\color{red}{bb} → b\color{blue}{cc}).
* In the 2-nd test case Koa has no way to make string A equal B.
* In the 3-rd test case Koa:
1. selects position 1 and sets A_1 = t (\color{red}{a}bc → \color{blue}{t}bc).
2. selects position 2 and sets A_2 = s (t\color{red}{b}c → t\color{blue}{s}c).
3. selects position 3 and sets A_3 = r (ts\color{red}{c} → ts\color{blue}{r}).
Tags: dsu, graphs, greedy, sortings, strings, trees, two pointers
Correct Solution:
```
import sys
import heapq, functools, collections
import math, random
from collections import Counter, defaultdict
# available on Google, not available on Codeforces
# import numpy as np
# import scipy
def solve(arr,brr): # fix inputs here
console("----- solving ------")
console(arr)
console(brr)
abc = dict((ab, idx) for idx,ab in enumerate("abcdefghijklmnopqrst"))
crr = []
drr = []
for a,b in zip(arr,brr):
if a > b:
return -1
if a != b:
crr.append(abc[a])
drr.append(abc[b])
console(crr)
console(drr)
if len(crr) == 0:
return 0
d = defaultdict(set)
for a,b in zip(crr,drr):
d[a].add(b)
d[b].add(a)
console(d)
visited = [False for _ in range(len(abc))]
idx = 1
for k in [x for x in d.keys()]:
if visited[k]:
continue
idx += 1
visited[k] = idx
stack = [x for x in d[k]]
while stack:
cur = stack.pop()
visited[cur] = idx
# if not cur in d:
# continue
for nex in d[cur]:
if visited[nex]:
continue
visited[nex] = idx
stack.append(nex)
console(d)
console(visited)
return sum([a-1 for a in Counter([x for x in visited if x]).values()])
def console(*args): # the judge will not read these print statement
# print('\033[36m', *args, '\033[0m', file=sys.stderr)
return
# fast read all
# sys.stdin.readlines()
for case_num in range(int(input())):
# read line as a string
# strr = input()
# read line as an integer
_ = int(input())
a = input()
b = input()
# read one line and parse each word as a string
# lst = input().split()
# read one line and parse each word as an integer
# lst = list(map(int,input().split()))
# read matrix and parse as integers (after reading read nrows)
# lst = list(map(int,input().split()))
# nrows = lst[0] # index containing information, please change
# grid = []
# for _ in range(nrows):
# grid.append(list(map(int,input().split())))
res = solve(a,b) # please change
# Google - case number required
# print("Case #{}: {}".format(case_num+1, res))
# Codeforces - no case number required
print(res)
```
| 12,625
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Boy Valera likes strings. And even more he likes them, when they are identical. That's why in his spare time Valera plays the following game. He takes any two strings, consisting of lower case Latin letters, and tries to make them identical. According to the game rules, with each move Valera can change one arbitrary character Ai in one of the strings into arbitrary character Bi, but he has to pay for every move a particular sum of money, equal to Wi. He is allowed to make as many moves as he needs. Since Valera is a very economical boy and never wastes his money, he asked you, an experienced programmer, to help him answer the question: what minimum amount of money should Valera have to get identical strings.
Input
The first input line contains two initial non-empty strings s and t, consisting of lower case Latin letters. The length of each string doesn't exceed 105. The following line contains integer n (0 ≤ n ≤ 500) — amount of possible changings. Then follow n lines, each containing characters Ai and Bi (lower case Latin letters) and integer Wi (0 ≤ Wi ≤ 100), saying that it's allowed to change character Ai into character Bi in any of the strings and spend sum of money Wi.
Output
If the answer exists, output the answer to the problem, and the resulting string. Otherwise output -1 in the only line. If the answer is not unique, output any.
Examples
Input
uayd
uxxd
3
a x 8
x y 13
d c 3
Output
21
uxyd
Input
a
b
3
a b 2
a b 3
b a 5
Output
2
b
Input
abc
ab
6
a b 4
a b 7
b a 8
c b 11
c a 3
a c 0
Output
-1
Tags: shortest paths
Correct Solution:
```
import sys, string
import itertools
s, t = input().strip(), input().strip()
if len(s) != len(t):
print(-1)
sys.exit()
vertices = string.ascii_lowercase
g = { c: { c: 0 } for c in vertices }
n = int(input())
for i in range(n):
u, v, cost = input().split()
cost = int(cost)
if v not in g[u] or g[u][v] > cost:
g[u][v] = cost
for p in vertices:
for u in vertices:
if p not in g[u]:
continue
for v in vertices:
if v not in g[p]:
continue
if v not in g[u] or g[u][v] > g[u][p] + g[p][v]:
g[u][v] = g[u][p] + g[p][v]
best_costs = { c: { c: 0 } for c in vertices }
best_chars = { c: { c: c } for c in vertices }
for a, b in itertools.product(vertices, vertices):
if a == b:
continue
best_cost = None
best_char = None
for c in vertices:
if c in g[a] and c in g[b]:
if best_cost == None or best_cost > g[a][c] + g[b][c]:
best_cost = g[a][c] + g[b][c]
best_char = c
if b in g[a] and (best_cost == None or best_cost > g[a][b]):
best_cost = g[a][b]
best_char = b
if a in g[b] and (best_cost == None or best_cost > g[b][a]):
best_cost = g[b][a]
best_char = a
if best_cost == None:
continue
best_costs[a][b] = best_cost
best_chars[a][b] = best_char
total_cost = 0
chars = []
for a, b in zip(s, t):
if b not in best_costs[a]:
print(-1)
sys.exit()
total_cost += best_costs[a][b]
chars.append(best_chars[a][b])
print(total_cost)
print(''.join(chars))
```
| 12,780
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Boy Valera likes strings. And even more he likes them, when they are identical. That's why in his spare time Valera plays the following game. He takes any two strings, consisting of lower case Latin letters, and tries to make them identical. According to the game rules, with each move Valera can change one arbitrary character Ai in one of the strings into arbitrary character Bi, but he has to pay for every move a particular sum of money, equal to Wi. He is allowed to make as many moves as he needs. Since Valera is a very economical boy and never wastes his money, he asked you, an experienced programmer, to help him answer the question: what minimum amount of money should Valera have to get identical strings.
Input
The first input line contains two initial non-empty strings s and t, consisting of lower case Latin letters. The length of each string doesn't exceed 105. The following line contains integer n (0 ≤ n ≤ 500) — amount of possible changings. Then follow n lines, each containing characters Ai and Bi (lower case Latin letters) and integer Wi (0 ≤ Wi ≤ 100), saying that it's allowed to change character Ai into character Bi in any of the strings and spend sum of money Wi.
Output
If the answer exists, output the answer to the problem, and the resulting string. Otherwise output -1 in the only line. If the answer is not unique, output any.
Examples
Input
uayd
uxxd
3
a x 8
x y 13
d c 3
Output
21
uxyd
Input
a
b
3
a b 2
a b 3
b a 5
Output
2
b
Input
abc
ab
6
a b 4
a b 7
b a 8
c b 11
c a 3
a c 0
Output
-1
Tags: shortest paths
Correct Solution:
```
import sys
large = 10000000
def solve():
s = input()
t = input()
if len(s) != len(t):
print(-1)
return
n = int(input())
mem = [[large] * 26 for _ in range(26)]
for i in range(26):
mem[i][i] = 0
for i in range(n):
chra, chrb, strcost = input().split()
a = ord(chra) - ord('a')
b = ord(chrb) - ord('a')
cost = int(strcost)
mem[a][b] = min(mem[a][b], cost)
for start in range(26):
for end in range(26):
mem[start][end] = min(mem[start][end], mem[start][a] + mem[a][b] + mem[b][end])
cost = 0
res = [None] * len(s)
for i in range(len(s)):
mid = -1
midcost = large
a = ord(s[i]) - ord('a')
b = ord(t[i]) - ord('a')
for j in range(26):
if mem[a][j] != -1 and mem[b][j] != -1:
thiscost = mem[a][j] + mem[b][j]
if thiscost < midcost:
midcost = thiscost
mid = j
res[i] = chr(ord('a') + mid)
cost += midcost
if cost >= large:
print(-1)
return
print(cost)
print(''.join(map(str, res)))
if sys.hexversion == 50594544 : sys.stdin = open("test.txt")
solve()
```
| 12,781
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Boy Valera likes strings. And even more he likes them, when they are identical. That's why in his spare time Valera plays the following game. He takes any two strings, consisting of lower case Latin letters, and tries to make them identical. According to the game rules, with each move Valera can change one arbitrary character Ai in one of the strings into arbitrary character Bi, but he has to pay for every move a particular sum of money, equal to Wi. He is allowed to make as many moves as he needs. Since Valera is a very economical boy and never wastes his money, he asked you, an experienced programmer, to help him answer the question: what minimum amount of money should Valera have to get identical strings.
Input
The first input line contains two initial non-empty strings s and t, consisting of lower case Latin letters. The length of each string doesn't exceed 105. The following line contains integer n (0 ≤ n ≤ 500) — amount of possible changings. Then follow n lines, each containing characters Ai and Bi (lower case Latin letters) and integer Wi (0 ≤ Wi ≤ 100), saying that it's allowed to change character Ai into character Bi in any of the strings and spend sum of money Wi.
Output
If the answer exists, output the answer to the problem, and the resulting string. Otherwise output -1 in the only line. If the answer is not unique, output any.
Examples
Input
uayd
uxxd
3
a x 8
x y 13
d c 3
Output
21
uxyd
Input
a
b
3
a b 2
a b 3
b a 5
Output
2
b
Input
abc
ab
6
a b 4
a b 7
b a 8
c b 11
c a 3
a c 0
Output
-1
Tags: shortest paths
Correct Solution:
```
# http://codeforces.com/problemset/problem/33/B
# 33b: String Problem.
#input = raw_input
def build_graph(a):
w = [[float('inf') for col in range(26)] for row in range(26)]
for i in range(26):
w[i][i] = 0
for b in a:
if w[ord(b[0]) - 97][ord(b[1]) - 97] > b[2]:
w[ord(b[0]) - 97][ord(b[1]) - 97] = b[2]
for k in range(26):
for i in range(26):
for j in range(26):
if w[i][j] > w[i][k] + w[k][j]:
w[i][j] = w[i][k] + w[k][j]
return w
def test_build_graph():
a = [['a', 'b', 2], ['a', 'c', 6], ['b', 'm', 5], ['c', 'm', 3]]
m = build_graph(a)
print(m)
print(m[ord('a') - 97][ord('m') - 97])
print(m[ord('a') - 97][ord('b') - 97])
def transfer(s, t, a):
if len(s) != len(t):
return -1
r = ''
z = 0
w = build_graph(a)
for d, p in zip(s, t):
if d == p:
r += d
else:
c = float('inf')
q = ''
i = ord(d) - 97
j = ord(p) - 97
for k in range(26):
v = w[i][k] + w[j][k]
if c > v:
c = v
q = chr(k + 97)
if c == float('inf'):
return -1
z += c
r += q
r = str(z) + '\n' + r
return r
def test_transfer():
s = 'uayd'
t = 'uxxd'
a = [['a', 'x', 8], ['x', 'y', 13], ['d', 'c', 3]]
assert transfer(s, t, a) == '21\nuxyd'
s1 = 'a'
t1 = 'b'
a1 = [['a', 'b', 2], ['a', 'b', 3], ['b', 'a', 5]]
assert transfer(s1, t1, a1) == '2\nb'
s2 = 'abc'
t2 = 'ab'
a2 = [['a', 'b', 4], ['a', 'b', 7], ['b', 'a', 8], ['c', 'b', 11], ['c', 'a', 3], ['a', 'c', 0]]
assert transfer(s2, t2, a2) == -1
s3 = 'abcd'
t3 = 'acer'
a3 = [['b', 'c', 100], ['c', 'b', 10], ['c', 'x', 1], ['e', 'x', 3], ['c', 'e', 7], ['r', 'd', 11]]
assert transfer(s3, t3, a3) == '25\nabxd'
def fun():
s = input()
t = input()
n = int(input())
a = []
for c in range(n):
x, y, z = map(str, input().split())
a.append([x, y, int(z)])
print(transfer(s, t, a))
#test_build_graph()
#test_transfer()
fun()
```
| 12,782
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Boy Valera likes strings. And even more he likes them, when they are identical. That's why in his spare time Valera plays the following game. He takes any two strings, consisting of lower case Latin letters, and tries to make them identical. According to the game rules, with each move Valera can change one arbitrary character Ai in one of the strings into arbitrary character Bi, but he has to pay for every move a particular sum of money, equal to Wi. He is allowed to make as many moves as he needs. Since Valera is a very economical boy and never wastes his money, he asked you, an experienced programmer, to help him answer the question: what minimum amount of money should Valera have to get identical strings.
Input
The first input line contains two initial non-empty strings s and t, consisting of lower case Latin letters. The length of each string doesn't exceed 105. The following line contains integer n (0 ≤ n ≤ 500) — amount of possible changings. Then follow n lines, each containing characters Ai and Bi (lower case Latin letters) and integer Wi (0 ≤ Wi ≤ 100), saying that it's allowed to change character Ai into character Bi in any of the strings and spend sum of money Wi.
Output
If the answer exists, output the answer to the problem, and the resulting string. Otherwise output -1 in the only line. If the answer is not unique, output any.
Examples
Input
uayd
uxxd
3
a x 8
x y 13
d c 3
Output
21
uxyd
Input
a
b
3
a b 2
a b 3
b a 5
Output
2
b
Input
abc
ab
6
a b 4
a b 7
b a 8
c b 11
c a 3
a c 0
Output
-1
Tags: shortest paths
Correct Solution:
```
import os
import sys
from math import *
from collections import *
# from fractions import *
# from heapq import*
from bisect import *
from io import BytesIO, IOBase
def vsInput():
sys.stdin = open('input.txt', 'r')
sys.stdout = open('output.txt', 'w')
BUFSIZE = 8192
class FastIO(IOBase):
newlines = 0
def __init__(self, file):
self._fd = file.fileno()
self.buffer = BytesIO()
self.writable = "x" in file.mode or "r" not in file.mode
self.write = self.buffer.write if self.writable else None
def read(self):
while True:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
if not b:
break
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines = 0
return self.buffer.read()
def readline(self):
while self.newlines == 0:
b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
self.newlines = b.count(b"\n") + (not b)
ptr = self.buffer.tell()
self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
self.newlines -= 1
return self.buffer.readline()
def flush(self):
if self.writable:
os.write(self._fd, self.buffer.getvalue())
self.buffer.truncate(0), self.buffer.seek(0)
class IOWrapper(IOBase):
def __init__(self, file):
self.buffer = FastIO(file)
self.flush = self.buffer.flush
self.writable = self.buffer.writable
self.write = lambda s: self.buffer.write(s.encode("ascii"))
self.read = lambda: self.buffer.read().decode("ascii")
self.readline = lambda: self.buffer.readline().decode("ascii")
sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")
ALPHA='abcdefghijklmnopqrstuvwxyz/'
M=1000000007
EPS=1e-6
def Ceil(a,b): return a//b+int(a%b>0)
def value():return tuple(map(int,input().split()))
def array():return [int(i) for i in input().split()]
def Int():return int(input())
def Str():return input()
def arrayS():return [i for i in input().split()]
#-------------------------code---------------------------#
s=list(input())
t=list(input())
n=int(input())
dic={}
adj=[[] for x in range(26)]
for x in range(n):
aa,bb,cost=input().split(" ")
cost=int(cost)
a=ord(aa)-ord('a')
b=ord(bb)-ord('a')
chk=False
for y in range(len(adj[a])):
if adj[a][y][0]==b:
adj[a][y][1]=min(cost,adj[a][y][1])
chk=True
if chk==False:
adj[a].append([b,cost])
ans=[]
vis=[False for x in range(26)]
def dfs(x,start,cnt):
temp=chr(start+97)+chr(x+97)
if temp in dic.keys() and cnt>=dic[temp]:
return
else:
vis[x]=True
temp=chr(start+97)+chr(x+97)
if temp in dic.keys():
dic[temp]=min(dic[temp],cnt)
else:
dic[temp]=cnt
for z in adj[x]:
dfs(z[0],start,cnt+z[1])
for x in range(26):
adj[x].sort(key=lambda x:x[1])
for x in range(26):
dfs(x,x,0)
for x in range(ord('a'),ord('z')+1):
temp=chr(x)+chr(x)
if temp in dic.keys():
dic[temp]=0
else:
dic[temp]=0
chk=1
spend=0
if len(s)!=len(t):
print(-1)
else:
for x in range(len(s)):
if s[x]==t[x]:
ans.append(s[x])
else:
notfound=True
spendhere=int(1e100)
thechar='a'
for y in range(ord('a'),ord('z')+1):
temp=s[x]+chr(y)
retemp=t[x]+chr(y)
if temp in dic.keys() and retemp in dic.keys():
notfound=False
if spendhere>dic[temp]+dic[retemp]:
thechar=chr(y)
spendhere=dic[temp]+dic[retemp]
if notfound:
chk=0
break
else:
ans.append(thechar)
spend+=spendhere
if chk==0:
print(-1)
else:
print(spend)
print(*ans,sep="")
```
| 12,783
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Boy Valera likes strings. And even more he likes them, when they are identical. That's why in his spare time Valera plays the following game. He takes any two strings, consisting of lower case Latin letters, and tries to make them identical. According to the game rules, with each move Valera can change one arbitrary character Ai in one of the strings into arbitrary character Bi, but he has to pay for every move a particular sum of money, equal to Wi. He is allowed to make as many moves as he needs. Since Valera is a very economical boy and never wastes his money, he asked you, an experienced programmer, to help him answer the question: what minimum amount of money should Valera have to get identical strings.
Input
The first input line contains two initial non-empty strings s and t, consisting of lower case Latin letters. The length of each string doesn't exceed 105. The following line contains integer n (0 ≤ n ≤ 500) — amount of possible changings. Then follow n lines, each containing characters Ai and Bi (lower case Latin letters) and integer Wi (0 ≤ Wi ≤ 100), saying that it's allowed to change character Ai into character Bi in any of the strings and spend sum of money Wi.
Output
If the answer exists, output the answer to the problem, and the resulting string. Otherwise output -1 in the only line. If the answer is not unique, output any.
Examples
Input
uayd
uxxd
3
a x 8
x y 13
d c 3
Output
21
uxyd
Input
a
b
3
a b 2
a b 3
b a 5
Output
2
b
Input
abc
ab
6
a b 4
a b 7
b a 8
c b 11
c a 3
a c 0
Output
-1
Tags: shortest paths
Correct Solution:
```
s = input()
t = input()
if(len(s) != len(t)):
print(-1)
exit()
dist = [[10**15 for j in range(26)] for i in range(26)]
for i in range(26):
dist[i][i] = 0
n = int(input())
for i in range(n):
a = input().split()
x = ord(a[0]) - 97
y = ord(a[1]) - 97
w = int(a[-1])
dist[x][y] = min(dist[x][y], w)
for k in range(26):
for i in range(26):
for j in range(26):
dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j])
ans = ''
res = 0
n = len(s)
for i in range(n):
if(s[i] == t[i]):
ans += s[i]
continue
cost = 10**15
pos = -1
x = ord(s[i]) - 97
y = ord(t[i]) - 97
for j in range(26):
if(dist[x][j] + dist[y][j] < cost):
cost = dist[x][j] + dist[y][j]
pos = j
if(pos == -1):
print(-1)
exit()
res += cost
ans += chr(pos + 97)
print(res)
print(ans)
```
| 12,784
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Boy Valera likes strings. And even more he likes them, when they are identical. That's why in his spare time Valera plays the following game. He takes any two strings, consisting of lower case Latin letters, and tries to make them identical. According to the game rules, with each move Valera can change one arbitrary character Ai in one of the strings into arbitrary character Bi, but he has to pay for every move a particular sum of money, equal to Wi. He is allowed to make as many moves as he needs. Since Valera is a very economical boy and never wastes his money, he asked you, an experienced programmer, to help him answer the question: what minimum amount of money should Valera have to get identical strings.
Input
The first input line contains two initial non-empty strings s and t, consisting of lower case Latin letters. The length of each string doesn't exceed 105. The following line contains integer n (0 ≤ n ≤ 500) — amount of possible changings. Then follow n lines, each containing characters Ai and Bi (lower case Latin letters) and integer Wi (0 ≤ Wi ≤ 100), saying that it's allowed to change character Ai into character Bi in any of the strings and spend sum of money Wi.
Output
If the answer exists, output the answer to the problem, and the resulting string. Otherwise output -1 in the only line. If the answer is not unique, output any.
Examples
Input
uayd
uxxd
3
a x 8
x y 13
d c 3
Output
21
uxyd
Input
a
b
3
a b 2
a b 3
b a 5
Output
2
b
Input
abc
ab
6
a b 4
a b 7
b a 8
c b 11
c a 3
a c 0
Output
-1
Tags: shortest paths
Correct Solution:
```
def code(c):
return ord(c) - ord('a')
def main():
a = input()
b = input()
m = int(input())
n = 26
d = [[10 ** 9 for i in range(n)] for j in range(n)]
for i in range(n):
d[i][i] = 0
for i in range(m):
s, t, w = input().split()
w = int(w)
s = code(s)
t = code(t)
d[s][t] = min(d[s][t], w)
for k in range(n):
for i in range(n):
for j in range(n):
d[i][j] = min(d[i][j], d[i][k] + d[k][j])
if len(a) != len(b):
print(-1)
else:
ans = 0
res = []
for i in range(len(a)):
x = code(a[i])
y = code(b[i])
min_c = 'a'
min_cost = 10 ** 9
for j in range(n):
cur = d[x][j] + d[y][j]
if cur < min_cost:
min_cost = cur
min_c = chr(j + ord('a'))
res.append(min_c)
ans += min_cost
if ans >= 10 ** 9:
print(-1)
else:
print(ans)
for j in res:
print(j, end='')
print()
main()
```
| 12,785
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Boy Valera likes strings. And even more he likes them, when they are identical. That's why in his spare time Valera plays the following game. He takes any two strings, consisting of lower case Latin letters, and tries to make them identical. According to the game rules, with each move Valera can change one arbitrary character Ai in one of the strings into arbitrary character Bi, but he has to pay for every move a particular sum of money, equal to Wi. He is allowed to make as many moves as he needs. Since Valera is a very economical boy and never wastes his money, he asked you, an experienced programmer, to help him answer the question: what minimum amount of money should Valera have to get identical strings.
Input
The first input line contains two initial non-empty strings s and t, consisting of lower case Latin letters. The length of each string doesn't exceed 105. The following line contains integer n (0 ≤ n ≤ 500) — amount of possible changings. Then follow n lines, each containing characters Ai and Bi (lower case Latin letters) and integer Wi (0 ≤ Wi ≤ 100), saying that it's allowed to change character Ai into character Bi in any of the strings and spend sum of money Wi.
Output
If the answer exists, output the answer to the problem, and the resulting string. Otherwise output -1 in the only line. If the answer is not unique, output any.
Examples
Input
uayd
uxxd
3
a x 8
x y 13
d c 3
Output
21
uxyd
Input
a
b
3
a b 2
a b 3
b a 5
Output
2
b
Input
abc
ab
6
a b 4
a b 7
b a 8
c b 11
c a 3
a c 0
Output
-1
Tags: shortest paths
Correct Solution:
```
# http://codeforces.com/problemset/problem/33/B
# 33b: String Problem.
#input = raw_input
def calc_path(a):
'''
this function uses floyd-warshall alg to compute all pairs shortest path weight among alphabet characters.
input:
a: a 2d list which gives the weighted edge data. e.g., a = [['a', 'x', 42]]: only one edge, ('a', 'x'), with weight 42.
result:
all pairs shortest path weight matrix, a 26-length 2d list. w[i][i] == 0; for i != j, w[i][j] == infinite indicates there's no path between i and j.
'''
w = [[float('inf') for col in range(26)] for row in range(26)]
for i in range(26):
w[i][i] = 0
for b in a:
if w[ord(b[0]) - 97][ord(b[1]) - 97] > b[2]:
w[ord(b[0]) - 97][ord(b[1]) - 97] = b[2]
for k in range(26):
for i in range(26):
for j in range(26):
if w[i][j] > w[i][k] + w[k][j]:
w[i][j] = w[i][k] + w[k][j]
return w
def test_calc_path():
a = [['a', 'b', 2], ['a', 'c', 6], ['b', 'm', 5], ['c', 'm', 3]]
m = calc_path(a)
print(m)
print(m[ord('a') - 97][ord('m') - 97])
print(m[ord('a') - 97][ord('b') - 97])
def transfer(s, t, a):
'''
this function firstly invokes calc_path to compute all pairs shortest path among alphabet characters, and then computes the minimum transformation position by position of s and t. finally, a minimal transformation weight and outcome is returned.
input:
s, t: the input string to be transformed.
a: the character transformation cost list, 2d. e.g., a = [['a', 'x', 42], ['u', 'v', 8]]: a => x costs 42; u => v costs 8.
result:
-1 if transformation is not possible; otherwise, the minimal transformation cost and result, e.g. '12\nabc'.
'''
if len(s) != len(t):
return -1
r = ''
z = 0
w = calc_path(a)
for d, p in zip(s, t):
if d == p:
r += d
else:
c = float('inf')
q = ''
i = ord(d) - 97
j = ord(p) - 97
for k in range(26):
v = w[i][k] + w[j][k]
if c > v:
c = v
q = chr(k + 97)
if c == float('inf'):
return -1
z += c
r += q
r = str(z) + '\n' + r
return r
def test_transfer():
s = 'uayd'
t = 'uxxd'
a = [['a', 'x', 8], ['x', 'y', 13], ['d', 'c', 3]]
assert transfer(s, t, a) == '21\nuxyd'
s1 = 'a'
t1 = 'b'
a1 = [['a', 'b', 2], ['a', 'b', 3], ['b', 'a', 5]]
assert transfer(s1, t1, a1) == '2\nb'
s2 = 'abc'
t2 = 'ab'
a2 = [['a', 'b', 4], ['a', 'b', 7], ['b', 'a', 8], ['c', 'b', 11], ['c', 'a', 3], ['a', 'c', 0]]
assert transfer(s2, t2, a2) == -1
s3 = 'abcd'
t3 = 'acer'
a3 = [['b', 'c', 100], ['c', 'b', 10], ['c', 'x', 1], ['e', 'x', 3], ['c', 'e', 7], ['r', 'd', 11]]
assert transfer(s3, t3, a3) == '25\nabxd'
def fun():
s = input()
t = input()
n = int(input())
a = []
for c in range(n):
x, y, z = map(str, input().split())
a.append([x, y, int(z)])
print(transfer(s, t, a))
#test_calc_path()
#test_transfer()
fun()
```
| 12,786
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Boy Valera likes strings. And even more he likes them, when they are identical. That's why in his spare time Valera plays the following game. He takes any two strings, consisting of lower case Latin letters, and tries to make them identical. According to the game rules, with each move Valera can change one arbitrary character Ai in one of the strings into arbitrary character Bi, but he has to pay for every move a particular sum of money, equal to Wi. He is allowed to make as many moves as he needs. Since Valera is a very economical boy and never wastes his money, he asked you, an experienced programmer, to help him answer the question: what minimum amount of money should Valera have to get identical strings.
Input
The first input line contains two initial non-empty strings s and t, consisting of lower case Latin letters. The length of each string doesn't exceed 105. The following line contains integer n (0 ≤ n ≤ 500) — amount of possible changings. Then follow n lines, each containing characters Ai and Bi (lower case Latin letters) and integer Wi (0 ≤ Wi ≤ 100), saying that it's allowed to change character Ai into character Bi in any of the strings and spend sum of money Wi.
Output
If the answer exists, output the answer to the problem, and the resulting string. Otherwise output -1 in the only line. If the answer is not unique, output any.
Examples
Input
uayd
uxxd
3
a x 8
x y 13
d c 3
Output
21
uxyd
Input
a
b
3
a b 2
a b 3
b a 5
Output
2
b
Input
abc
ab
6
a b 4
a b 7
b a 8
c b 11
c a 3
a c 0
Output
-1
Tags: shortest paths
Correct Solution:
```
# http://codeforces.com/problemset/problem/33/B
# 33b: String Problem.
# 象道, montreal, quebec, canada.
#input = raw_input
def calc_path(a):
'''
this function uses floyd-warshall alg to compute all pairs shortest path weight among alphabet characters.
input:
a: a 2d list which gives the weighted edge data. e.g., a = [['a', 'x', 42]]: only one edge, ('a', 'x'), with weight 42.
result:
all pairs shortest path weight matrix, a 26-length 2d list. w[i][i] == 0; for i != j, w[i][j] == infinite indicates there's no path between i and j.
'''
w = [[float('inf') for col in range(26)] for row in range(26)]
for i in range(26):
w[i][i] = 0
for b in a:
if w[ord(b[0]) - 97][ord(b[1]) - 97] > b[2]:
w[ord(b[0]) - 97][ord(b[1]) - 97] = b[2]
for k in range(26):
for i in range(26):
for j in range(26):
if w[i][j] > w[i][k] + w[k][j]:
w[i][j] = w[i][k] + w[k][j]
return w
def test_calc_path():
a = [['a', 'b', 2], ['a', 'c', 6], ['b', 'm', 5], ['c', 'm', 3]]
m = calc_path(a)
print(m)
print(m[ord('a') - 97][ord('m') - 97])
print(m[ord('a') - 97][ord('b') - 97])
def transfer(s, t, a):
'''
this function firstly invokes calc_path to compute all pairs shortest path among alphabet characters, and then computes the minimum transformation position by position of s and t. finally, a minimal transformation weight and outcome is returned.
input:
s, t: the input string to be transformed.
a: the character transformation cost list, 2d. e.g., a = [['a', 'x', 42], ['u', 'v', 8]]: a => x costs 42; u => v costs 8.
result:
-1 if transformation is not possible; otherwise, the minimal transformation cost and result, e.g. '12\nabc'.
'''
if len(s) != len(t):
return -1
r = ''
z = 0
w = calc_path(a)
for d, p in zip(s, t):
if d == p:
r += d
else:
c = float('inf')
q = ''
i = ord(d) - 97
j = ord(p) - 97
for k in range(26):
v = w[i][k] + w[j][k]
if c > v:
c = v
q = chr(k + 97)
if c == float('inf'):
return -1
z += c
r += q
r = str(z) + '\n' + r
return r
def test_transfer():
s = 'uayd'
t = 'uxxd'
a = [['a', 'x', 8], ['x', 'y', 13], ['d', 'c', 3]]
assert transfer(s, t, a) == '21\nuxyd'
s1 = 'a'
t1 = 'b'
a1 = [['a', 'b', 2], ['a', 'b', 3], ['b', 'a', 5]]
assert transfer(s1, t1, a1) == '2\nb'
s2 = 'abc'
t2 = 'ab'
a2 = [['a', 'b', 4], ['a', 'b', 7], ['b', 'a', 8], ['c', 'b', 11], ['c', 'a', 3], ['a', 'c', 0]]
assert transfer(s2, t2, a2) == -1
s3 = 'abcd'
t3 = 'acer'
a3 = [['b', 'c', 100], ['c', 'b', 10], ['c', 'x', 1], ['e', 'x', 3], ['c', 'e', 7], ['r', 'd', 11]]
assert transfer(s3, t3, a3) == '25\nabxd'
def fun():
s = input()
t = input()
n = int(input())
a = []
for c in range(n):
x, y, z = map(str, input().split())
a.append([x, y, int(z)])
print(transfer(s, t, a))
#test_calc_path()
#test_transfer()
fun()
```
| 12,787
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Andrew, Fedor and Alex are inventive guys. Now they invent the game with strings for two players.
Given a group of n non-empty strings. During the game two players build the word together, initially the word is empty. The players move in turns. On his step player must add a single letter in the end of the word, the resulting word must be prefix of at least one string from the group. A player loses if he cannot move.
Andrew and Alex decided to play this game k times. The player who is the loser of the i-th game makes the first move in the (i + 1)-th game. Guys decided that the winner of all games is the player who wins the last (k-th) game. Andrew and Alex already started the game. Fedor wants to know who wins the game if both players will play optimally. Help him.
Input
The first line contains two integers, n and k (1 ≤ n ≤ 105; 1 ≤ k ≤ 109).
Each of the next n lines contains a single non-empty string from the given group. The total length of all strings from the group doesn't exceed 105. Each string of the group consists only of lowercase English letters.
Output
If the player who moves first wins, print "First", otherwise print "Second" (without the quotes).
Examples
Input
2 3
a
b
Output
First
Input
3 1
a
b
c
Output
First
Input
1 2
ab
Output
Second
Tags: dfs and similar, dp, games, implementation, strings, trees
Correct Solution:
```
# https://codeforces.com/contest/455/problem/B
import sys
reader = (s.rstrip() for s in sys.stdin)
input = reader.__next__
class Trie:
def __init__(self):
self.arr = {}
def insert(self, word):
root = self
for x in word:
if x not in root.arr:
root.arr[x] = Trie()
root = root.arr[x]
def dfs(self):
if not len(self.arr):
return False, True
win, lose = False, False
for x in self.arr:
w, l = self.arr[x].dfs()
win = win or not w
lose = lose or not l
return win, lose
def answer(flag):
print("First" if flag else "Second")
T = Trie()
n, k = map(int, input().split())
for _ in range(n):
T.insert(input())
win, lose = T.dfs()
if k == 1:
answer(win)
elif not win:
answer(win)
elif lose:
answer(win)
elif k&1:
answer(win)
else:
answer(not win)
```
| 12,830
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Andrew, Fedor and Alex are inventive guys. Now they invent the game with strings for two players.
Given a group of n non-empty strings. During the game two players build the word together, initially the word is empty. The players move in turns. On his step player must add a single letter in the end of the word, the resulting word must be prefix of at least one string from the group. A player loses if he cannot move.
Andrew and Alex decided to play this game k times. The player who is the loser of the i-th game makes the first move in the (i + 1)-th game. Guys decided that the winner of all games is the player who wins the last (k-th) game. Andrew and Alex already started the game. Fedor wants to know who wins the game if both players will play optimally. Help him.
Input
The first line contains two integers, n and k (1 ≤ n ≤ 105; 1 ≤ k ≤ 109).
Each of the next n lines contains a single non-empty string from the given group. The total length of all strings from the group doesn't exceed 105. Each string of the group consists only of lowercase English letters.
Output
If the player who moves first wins, print "First", otherwise print "Second" (without the quotes).
Examples
Input
2 3
a
b
Output
First
Input
3 1
a
b
c
Output
First
Input
1 2
ab
Output
Second
Tags: dfs and similar, dp, games, implementation, strings, trees
Correct Solution:
```
# -*- coding:utf-8 -*-
"""
created by shuangquan.huang at 2/11/20
"""
import collections
import time
import os
import sys
import bisect
import heapq
from typing import List
def make_trie(A):
trie = {}
for word in A:
t = trie
for w in word:
if w not in t:
t[w] = {}
t = t[w]
# t['#'] = True
return trie
def game(trie):
if not trie:
return False
return not all([game(t) for k, t in trie.items()])
def can_lose(trie):
if not trie:
return True
return any([not can_lose(t) for k, t in trie.items()])
def solve(N, K, A):
trie = make_trie(A)
win = game(trie)
if not win:
return False
if K == 1:
return True
if can_lose(trie):
return True
return K % 2 == 1
N, K = map(int, input().split())
A = []
for i in range(N):
s = input()
A.append(s)
print('First' if solve(N, K, A) else 'Second')
```
| 12,831
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Andrew, Fedor and Alex are inventive guys. Now they invent the game with strings for two players.
Given a group of n non-empty strings. During the game two players build the word together, initially the word is empty. The players move in turns. On his step player must add a single letter in the end of the word, the resulting word must be prefix of at least one string from the group. A player loses if he cannot move.
Andrew and Alex decided to play this game k times. The player who is the loser of the i-th game makes the first move in the (i + 1)-th game. Guys decided that the winner of all games is the player who wins the last (k-th) game. Andrew and Alex already started the game. Fedor wants to know who wins the game if both players will play optimally. Help him.
Input
The first line contains two integers, n and k (1 ≤ n ≤ 105; 1 ≤ k ≤ 109).
Each of the next n lines contains a single non-empty string from the given group. The total length of all strings from the group doesn't exceed 105. Each string of the group consists only of lowercase English letters.
Output
If the player who moves first wins, print "First", otherwise print "Second" (without the quotes).
Examples
Input
2 3
a
b
Output
First
Input
3 1
a
b
c
Output
First
Input
1 2
ab
Output
Second
Tags: dfs and similar, dp, games, implementation, strings, trees
Correct Solution:
```
class Node:
def __init__(self):
self._next = {}
self._win = None
self._lose = None
def get_or_create(self, c: str):
return self._next.setdefault(c, Node())
def traverse(self):
self._win = False
self._lose = True if len(self._next) == 0 else False
for _, adj in self._next.items():
adj.traverse()
self._win = self._win or not adj._win
self._lose = self._lose or not adj._lose
class Trie:
def __init__(self):
self._root = Node()
def add(self, key: str):
node = self._root
for char in key:
node = node.get_or_create(char)
def traverse(self):
self._root.traverse()
def get_winner(self, k: int):
if not self._root._win:
return 'Second'
if self._root._lose:
return 'First'
if k % 2 == 1:
return 'First'
else:
return 'Second'
if __name__ == "__main__":
n, k = map(int, input().split())
trie = Trie()
for _ in range(n):
trie.add(input())
trie.traverse()
print(trie.get_winner(k))
```
| 12,832
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Andrew, Fedor and Alex are inventive guys. Now they invent the game with strings for two players.
Given a group of n non-empty strings. During the game two players build the word together, initially the word is empty. The players move in turns. On his step player must add a single letter in the end of the word, the resulting word must be prefix of at least one string from the group. A player loses if he cannot move.
Andrew and Alex decided to play this game k times. The player who is the loser of the i-th game makes the first move in the (i + 1)-th game. Guys decided that the winner of all games is the player who wins the last (k-th) game. Andrew and Alex already started the game. Fedor wants to know who wins the game if both players will play optimally. Help him.
Input
The first line contains two integers, n and k (1 ≤ n ≤ 105; 1 ≤ k ≤ 109).
Each of the next n lines contains a single non-empty string from the given group. The total length of all strings from the group doesn't exceed 105. Each string of the group consists only of lowercase English letters.
Output
If the player who moves first wins, print "First", otherwise print "Second" (without the quotes).
Examples
Input
2 3
a
b
Output
First
Input
3 1
a
b
c
Output
First
Input
1 2
ab
Output
Second
Tags: dfs and similar, dp, games, implementation, strings, trees
Correct Solution:
```
from sys import stdin, setrecursionlimit
setrecursionlimit(200000)
n,k = [int(x) for x in stdin.readline().split()]
tree = {}
for x in range(n):
s = stdin.readline().strip()
cur = tree
for x in s:
if not x in cur:
cur[x] = {}
cur = cur[x]
def forced(tree):
if not tree:
return (False,True)
else:
win = False
lose = False
for x in tree:
a,b = forced(tree[x])
if not a:
win = True
if not b:
lose = True
return (win,lose)
a,b = forced(tree)
if a == 0:
print('Second')
elif a == 1 and b == 1:
print('First')
else:
if k%2 == 0:
print('Second')
else:
print('First')
```
| 12,833
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Andrew, Fedor and Alex are inventive guys. Now they invent the game with strings for two players.
Given a group of n non-empty strings. During the game two players build the word together, initially the word is empty. The players move in turns. On his step player must add a single letter in the end of the word, the resulting word must be prefix of at least one string from the group. A player loses if he cannot move.
Andrew and Alex decided to play this game k times. The player who is the loser of the i-th game makes the first move in the (i + 1)-th game. Guys decided that the winner of all games is the player who wins the last (k-th) game. Andrew and Alex already started the game. Fedor wants to know who wins the game if both players will play optimally. Help him.
Input
The first line contains two integers, n and k (1 ≤ n ≤ 105; 1 ≤ k ≤ 109).
Each of the next n lines contains a single non-empty string from the given group. The total length of all strings from the group doesn't exceed 105. Each string of the group consists only of lowercase English letters.
Output
If the player who moves first wins, print "First", otherwise print "Second" (without the quotes).
Examples
Input
2 3
a
b
Output
First
Input
3 1
a
b
c
Output
First
Input
1 2
ab
Output
Second
Tags: dfs and similar, dp, games, implementation, strings, trees
Correct Solution:
```
N = 100000
Z = 26
#别用这玩意儿: trie = [[0] * Z] * N 巨坑！https://www.cnblogs.com/PyLearn/p/7795552.html
trie = [[0 for i in range(Z)] for j in range(N)]
n = 0
k = 0
nodeNum = 0
def insertNode():
u = 0
string = input()
global nodeNum
for i in range(len(string)):
c = ord(string[i]) - ord('a')
if trie[u][c] == 0:
nodeNum += 1
trie[u][c] = nodeNum
u = trie[u][c]
# print(u)
stateWin = [False for i in range(N)]
stateLose = [False for i in range(N)]
def dfs(u):
leaf = True
for c in range(Z):
if (trie[u][c]) != 0:
leaf = False
dfs(trie[u][c])
stateWin[u] |= (not(stateWin[trie[u][c]]))
stateLose[u] |= (not(stateLose[trie[u][c]]))
if leaf == True:
stateWin[u] = False
stateLose[u] = True
n,k = map(int,input().split())
for i in range(n):
insertNode()
dfs(0)
# print(stateWin[0])
# print(stateLose[0])
if (stateWin[0] and (stateLose[0] or (k % 2 == 1) )):
print("First")
else:
print("Second")
```
| 12,834
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Andrew, Fedor and Alex are inventive guys. Now they invent the game with strings for two players.
Given a group of n non-empty strings. During the game two players build the word together, initially the word is empty. The players move in turns. On his step player must add a single letter in the end of the word, the resulting word must be prefix of at least one string from the group. A player loses if he cannot move.
Andrew and Alex decided to play this game k times. The player who is the loser of the i-th game makes the first move in the (i + 1)-th game. Guys decided that the winner of all games is the player who wins the last (k-th) game. Andrew and Alex already started the game. Fedor wants to know who wins the game if both players will play optimally. Help him.
Input
The first line contains two integers, n and k (1 ≤ n ≤ 105; 1 ≤ k ≤ 109).
Each of the next n lines contains a single non-empty string from the given group. The total length of all strings from the group doesn't exceed 105. Each string of the group consists only of lowercase English letters.
Output
If the player who moves first wins, print "First", otherwise print "Second" (without the quotes).
Examples
Input
2 3
a
b
Output
First
Input
3 1
a
b
c
Output
First
Input
1 2
ab
Output
Second
Tags: dfs and similar, dp, games, implementation, strings, trees
Correct Solution:
```
"""
Codeforces Contest 260 Div 1 Problem B
Author : chaotic_iak
Language: Python 3.3.4
"""
def main():
n,k = read()
s = set()
for i in range(n): s.add(read(0))
s = list(s)
s.sort()
s = treeify(s)
res = solve(s)
if res == 0: # neither: second player win
print("Second")
if res == 1: # odd: first player win if k is odd
print("First" if k % 2 else "Second")
if res == 2: # even: second player win
print("Second")
if res == 3: # both: first player win
print("First")
def treeify(s):
res = [[] for _ in range(26)]
for i in s:
if i: res[ord(i[0]) - 97].append(i[1:])
fin = []
for i in range(26):
if res[i]: fin.append(treeify(res[i]))
return fin
def solve(s, parity=2):
for i in range(len(s)):
if isinstance(s[i], list): s[i] = solve(s[i], 3-parity)
if not s: return parity # no possible move: current parity
if 0 in s: return 3 # any neither: both
if 1 in s and 2 in s: return 3 # any odd and any even: both
if 1 in s: return 1 # any odd: odd
if 2 in s: return 2 # any even: even
return 0 # all both: neither
################################### NON-SOLUTION STUFF BELOW
def read(mode=2):
# 0: String
# 1: List of strings
# 2: List of integers
inputs = input().strip()
if mode == 0: return inputs
if mode == 1: return inputs.split()
if mode == 2: return map(int, inputs.split())
def write(s="\n"):
if isinstance(s, list): s = " ".join(map(str, s))
s = str(s)
print(s, end="")
main()
```
| 12,835
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Andrew, Fedor and Alex are inventive guys. Now they invent the game with strings for two players.
Given a group of n non-empty strings. During the game two players build the word together, initially the word is empty. The players move in turns. On his step player must add a single letter in the end of the word, the resulting word must be prefix of at least one string from the group. A player loses if he cannot move.
Andrew and Alex decided to play this game k times. The player who is the loser of the i-th game makes the first move in the (i + 1)-th game. Guys decided that the winner of all games is the player who wins the last (k-th) game. Andrew and Alex already started the game. Fedor wants to know who wins the game if both players will play optimally. Help him.
Input
The first line contains two integers, n and k (1 ≤ n ≤ 105; 1 ≤ k ≤ 109).
Each of the next n lines contains a single non-empty string from the given group. The total length of all strings from the group doesn't exceed 105. Each string of the group consists only of lowercase English letters.
Output
If the player who moves first wins, print "First", otherwise print "Second" (without the quotes).
Examples
Input
2 3
a
b
Output
First
Input
3 1
a
b
c
Output
First
Input
1 2
ab
Output
Second
Tags: dfs and similar, dp, games, implementation, strings, trees
Correct Solution:
```
# https://codeforces.com/contest/455/problem/B
import sys
reader = (s.rstrip() for s in sys.stdin)
input = reader.__next__
class Trie:
def __init__(self):
self.arr = {}
def insert(self, word):
for x in word:
if x not in self.arr:
self.arr[x] = Trie()
self = self.arr[x]
def dfs(self):
if not len(self.arr):
return False, True
win, lose = False, False
for x in self.arr:
w, l = self.arr[x].dfs()
win = win or not w
lose = lose or not l
return win, lose
def answer(flag):
print("First" if flag else "Second")
T = Trie()
n, k = map(int, input().split())
for _ in range(n):
T.insert(input())
win, lose = T.dfs()
if k == 1 or (not win) or lose or k&1:
answer(win)
else:
answer(not win)
```
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Misha hacked the Codeforces site. Then he decided to let all the users change their handles. A user can now change his handle any number of times. But each new handle must not be equal to any handle that is already used or that was used at some point.
Misha has a list of handle change requests. After completing the requests he wants to understand the relation between the original and the new handles of the users. Help him to do that.
Input
The first line contains integer q (1 ≤ q ≤ 1000), the number of handle change requests.
Next q lines contain the descriptions of the requests, one per line.
Each query consists of two non-empty strings old and new, separated by a space. The strings consist of lowercase and uppercase Latin letters and digits. Strings old and new are distinct. The lengths of the strings do not exceed 20.
The requests are given chronologically. In other words, by the moment of a query there is a single person with handle old, and handle new is not used and has not been used by anyone.
Output
In the first line output the integer n — the number of users that changed their handles at least once.
In the next n lines print the mapping between the old and the new handles of the users. Each of them must contain two strings, old and new, separated by a space, meaning that before the user had handle old, and after all the requests are completed, his handle is new. You may output lines in any order.
Each user who changes the handle must occur exactly once in this description.
Examples
Input
5
Misha ILoveCodeforces
Vasya Petrov
Petrov VasyaPetrov123
ILoveCodeforces MikeMirzayanov
Petya Ivanov
Output
3
Petya Ivanov
Misha MikeMirzayanov
Vasya VasyaPetrov123
Tags: data structures, dsu, strings
Correct Solution:
```
n=int(input())
queries=[]
names=[]
f=[]
l=[]
for i in range(n):
queries.append(input().split(' '))
for i in range(n):
for j in range(2):
if queries[i][j] in names:
if j==0:
names.remove(queries[i][j])
l[l.index(queries[i][j])]=queries[i][j-1]
else:
names.append(queries[i][j])
if j==0:
f.append(queries[i][j])
else:
if queries[i][j] not in l:
l.append(queries[i][j])
print(len(f))
for k in range(len(f)):
print(f[k],l[k])
```
| 12,859
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Misha hacked the Codeforces site. Then he decided to let all the users change their handles. A user can now change his handle any number of times. But each new handle must not be equal to any handle that is already used or that was used at some point.
Misha has a list of handle change requests. After completing the requests he wants to understand the relation between the original and the new handles of the users. Help him to do that.
Input
The first line contains integer q (1 ≤ q ≤ 1000), the number of handle change requests.
Next q lines contain the descriptions of the requests, one per line.
Each query consists of two non-empty strings old and new, separated by a space. The strings consist of lowercase and uppercase Latin letters and digits. Strings old and new are distinct. The lengths of the strings do not exceed 20.
The requests are given chronologically. In other words, by the moment of a query there is a single person with handle old, and handle new is not used and has not been used by anyone.
Output
In the first line output the integer n — the number of users that changed their handles at least once.
In the next n lines print the mapping between the old and the new handles of the users. Each of them must contain two strings, old and new, separated by a space, meaning that before the user had handle old, and after all the requests are completed, his handle is new. You may output lines in any order.
Each user who changes the handle must occur exactly once in this description.
Examples
Input
5
Misha ILoveCodeforces
Vasya Petrov
Petrov VasyaPetrov123
ILoveCodeforces MikeMirzayanov
Petya Ivanov
Output
3
Petya Ivanov
Misha MikeMirzayanov
Vasya VasyaPetrov123
Tags: data structures, dsu, strings
Correct Solution:
```
queries = []
for q in range(int(input())):
old, new = input().split()
done = False
for elem in queries:
if old == elem[-1]:
elem.append(new)
done = True
break
if not done:
queries.append([old, new])
print(len(queries))
for elem in queries:
print(elem[0], elem[-1])
```
| 12,860
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Misha hacked the Codeforces site. Then he decided to let all the users change their handles. A user can now change his handle any number of times. But each new handle must not be equal to any handle that is already used or that was used at some point.
Misha has a list of handle change requests. After completing the requests he wants to understand the relation between the original and the new handles of the users. Help him to do that.
Input
The first line contains integer q (1 ≤ q ≤ 1000), the number of handle change requests.
Next q lines contain the descriptions of the requests, one per line.
Each query consists of two non-empty strings old and new, separated by a space. The strings consist of lowercase and uppercase Latin letters and digits. Strings old and new are distinct. The lengths of the strings do not exceed 20.
The requests are given chronologically. In other words, by the moment of a query there is a single person with handle old, and handle new is not used and has not been used by anyone.
Output
In the first line output the integer n — the number of users that changed their handles at least once.
In the next n lines print the mapping between the old and the new handles of the users. Each of them must contain two strings, old and new, separated by a space, meaning that before the user had handle old, and after all the requests are completed, his handle is new. You may output lines in any order.
Each user who changes the handle must occur exactly once in this description.
Examples
Input
5
Misha ILoveCodeforces
Vasya Petrov
Petrov VasyaPetrov123
ILoveCodeforces MikeMirzayanov
Petya Ivanov
Output
3
Petya Ivanov
Misha MikeMirzayanov
Vasya VasyaPetrov123
Tags: data structures, dsu, strings
Correct Solution:
```
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
n = int(input())
b_a = {}
for n_ in range(n):
b, a = input().split()
replaced = False
for k in b_a:
if b_a[k] == b:
b_a[k] = a
replaced = True
if not replaced:
b_a[b] = a
print(len(b_a))
for k in b_a:
print (k + " " + b_a[k])
```
| 12,861
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Misha hacked the Codeforces site. Then he decided to let all the users change their handles. A user can now change his handle any number of times. But each new handle must not be equal to any handle that is already used or that was used at some point.
Misha has a list of handle change requests. After completing the requests he wants to understand the relation between the original and the new handles of the users. Help him to do that.
Input
The first line contains integer q (1 ≤ q ≤ 1000), the number of handle change requests.
Next q lines contain the descriptions of the requests, one per line.
Each query consists of two non-empty strings old and new, separated by a space. The strings consist of lowercase and uppercase Latin letters and digits. Strings old and new are distinct. The lengths of the strings do not exceed 20.
The requests are given chronologically. In other words, by the moment of a query there is a single person with handle old, and handle new is not used and has not been used by anyone.
Output
In the first line output the integer n — the number of users that changed their handles at least once.
In the next n lines print the mapping between the old and the new handles of the users. Each of them must contain two strings, old and new, separated by a space, meaning that before the user had handle old, and after all the requests are completed, his handle is new. You may output lines in any order.
Each user who changes the handle must occur exactly once in this description.
Examples
Input
5
Misha ILoveCodeforces
Vasya Petrov
Petrov VasyaPetrov123
ILoveCodeforces MikeMirzayanov
Petya Ivanov
Output
3
Petya Ivanov
Misha MikeMirzayanov
Vasya VasyaPetrov123
Tags: data structures, dsu, strings
Correct Solution:
```
#/usr/bin/env python3
N = int(input())
names = [input().split() for i in range(N)]
c_to_old = dict()
for n in names:
if n[0] not in c_to_old:
c_to_old[n[1]] = n[0]
else:
old = c_to_old[n[0]]
del c_to_old[n[0]]
c_to_old[n[1]] = old
print(len(c_to_old))
thing = sorted(c_to_old.items(), key = lambda x: x[1])
for c, o in thing:
print(o, c)
```
| 12,862
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Misha hacked the Codeforces site. Then he decided to let all the users change their handles. A user can now change his handle any number of times. But each new handle must not be equal to any handle that is already used or that was used at some point.
Misha has a list of handle change requests. After completing the requests he wants to understand the relation between the original and the new handles of the users. Help him to do that.
Input
The first line contains integer q (1 ≤ q ≤ 1000), the number of handle change requests.
Next q lines contain the descriptions of the requests, one per line.
Each query consists of two non-empty strings old and new, separated by a space. The strings consist of lowercase and uppercase Latin letters and digits. Strings old and new are distinct. The lengths of the strings do not exceed 20.
The requests are given chronologically. In other words, by the moment of a query there is a single person with handle old, and handle new is not used and has not been used by anyone.
Output
In the first line output the integer n — the number of users that changed their handles at least once.
In the next n lines print the mapping between the old and the new handles of the users. Each of them must contain two strings, old and new, separated by a space, meaning that before the user had handle old, and after all the requests are completed, his handle is new. You may output lines in any order.
Each user who changes the handle must occur exactly once in this description.
Examples
Input
5
Misha ILoveCodeforces
Vasya Petrov
Petrov VasyaPetrov123
ILoveCodeforces MikeMirzayanov
Petya Ivanov
Output
3
Petya Ivanov
Misha MikeMirzayanov
Vasya VasyaPetrov123
Tags: data structures, dsu, strings
Correct Solution:
```
# MC521 - Desafios de Programacao I - 1s2021
# Contest: 02/04/2021
# Problema J: Misha and Changing Handles
# le o numero de alteracoes a serem realizadas
n = int(input())
# inicializa o mapa dos idenficadores
alt = {}
# realiza a leitura das alteracoes e mapeia os identificadores dos usuarios
for _ in range(n):
# le o identificador antigo e o novo
antigo, novo = input().split()
# checa se o identficador a ser atualizado existe
if(antigo not in alt):
# caso nao exista
alt[novo] = antigo
else:
# caso exista, atualiza e remove o antigo
alt[novo] = alt[antigo]
alt.pop(antigo, None)
# imprime a quantidade de usuarios diferentes
print(len(alt))
# imprime os idenficadores iniciais e finais de cada usuario
for chave in alt:
print('{name1} {name2}'.format(name1=alt[chave], name2=chave))
```
| 12,863
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Misha hacked the Codeforces site. Then he decided to let all the users change their handles. A user can now change his handle any number of times. But each new handle must not be equal to any handle that is already used or that was used at some point.
Misha has a list of handle change requests. After completing the requests he wants to understand the relation between the original and the new handles of the users. Help him to do that.
Input
The first line contains integer q (1 ≤ q ≤ 1000), the number of handle change requests.
Next q lines contain the descriptions of the requests, one per line.
Each query consists of two non-empty strings old and new, separated by a space. The strings consist of lowercase and uppercase Latin letters and digits. Strings old and new are distinct. The lengths of the strings do not exceed 20.
The requests are given chronologically. In other words, by the moment of a query there is a single person with handle old, and handle new is not used and has not been used by anyone.
Output
In the first line output the integer n — the number of users that changed their handles at least once.
In the next n lines print the mapping between the old and the new handles of the users. Each of them must contain two strings, old and new, separated by a space, meaning that before the user had handle old, and after all the requests are completed, his handle is new. You may output lines in any order.
Each user who changes the handle must occur exactly once in this description.
Examples
Input
5
Misha ILoveCodeforces
Vasya Petrov
Petrov VasyaPetrov123
ILoveCodeforces MikeMirzayanov
Petya Ivanov
Output
3
Petya Ivanov
Misha MikeMirzayanov
Vasya VasyaPetrov123
Tags: data structures, dsu, strings
Correct Solution:
```
#coding:utf-8
n = int( input())
names = {}
changes = 0
for i in range(n):
current, changed = map(str, input().split())
if current not in names:
names[changed] = current
changes += 1
else:
aux = names[current]
names.pop(current)
names[changed] = aux
print(changes)
for i in names:
print(names[i],i)
```
| 12,864
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Misha hacked the Codeforces site. Then he decided to let all the users change their handles. A user can now change his handle any number of times. But each new handle must not be equal to any handle that is already used or that was used at some point.
Misha has a list of handle change requests. After completing the requests he wants to understand the relation between the original and the new handles of the users. Help him to do that.
Input
The first line contains integer q (1 ≤ q ≤ 1000), the number of handle change requests.
Next q lines contain the descriptions of the requests, one per line.
Each query consists of two non-empty strings old and new, separated by a space. The strings consist of lowercase and uppercase Latin letters and digits. Strings old and new are distinct. The lengths of the strings do not exceed 20.
The requests are given chronologically. In other words, by the moment of a query there is a single person with handle old, and handle new is not used and has not been used by anyone.
Output
In the first line output the integer n — the number of users that changed their handles at least once.
In the next n lines print the mapping between the old and the new handles of the users. Each of them must contain two strings, old and new, separated by a space, meaning that before the user had handle old, and after all the requests are completed, his handle is new. You may output lines in any order.
Each user who changes the handle must occur exactly once in this description.
Examples
Input
5
Misha ILoveCodeforces
Vasya Petrov
Petrov VasyaPetrov123
ILoveCodeforces MikeMirzayanov
Petya Ivanov
Output
3
Petya Ivanov
Misha MikeMirzayanov
Vasya VasyaPetrov123
Tags: data structures, dsu, strings
Correct Solution:
```
maps = {}
for i in range(int(input())):
old, new = input().split()
if old in maps:
maps[new] = maps[old]
del maps[old]
else:
maps[new] = old
print(len(maps))
for k, v in maps.items():
print(v + " " + k)
```
| 12,865
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
Misha hacked the Codeforces site. Then he decided to let all the users change their handles. A user can now change his handle any number of times. But each new handle must not be equal to any handle that is already used or that was used at some point.
Misha has a list of handle change requests. After completing the requests he wants to understand the relation between the original and the new handles of the users. Help him to do that.
Input
The first line contains integer q (1 ≤ q ≤ 1000), the number of handle change requests.
Next q lines contain the descriptions of the requests, one per line.
Each query consists of two non-empty strings old and new, separated by a space. The strings consist of lowercase and uppercase Latin letters and digits. Strings old and new are distinct. The lengths of the strings do not exceed 20.
The requests are given chronologically. In other words, by the moment of a query there is a single person with handle old, and handle new is not used and has not been used by anyone.
Output
In the first line output the integer n — the number of users that changed their handles at least once.
In the next n lines print the mapping between the old and the new handles of the users. Each of them must contain two strings, old and new, separated by a space, meaning that before the user had handle old, and after all the requests are completed, his handle is new. You may output lines in any order.
Each user who changes the handle must occur exactly once in this description.
Examples
Input
5
Misha ILoveCodeforces
Vasya Petrov
Petrov VasyaPetrov123
ILoveCodeforces MikeMirzayanov
Petya Ivanov
Output
3
Petya Ivanov
Misha MikeMirzayanov
Vasya VasyaPetrov123
Tags: data structures, dsu, strings
Correct Solution:
```
n=int(input())
arr=[]
for i in range(n):
s=input()
a=s.split(' ')
arr.append(a)
array=[['' for col in range(n)]for row in range(2)]
a1=[[]for k in range(n)]
a1[0].append(arr[0][0])
a1[0].append(arr[0][1])
a2=[]
a2.append(arr[0][1])
p=1
while(p<n):
a2.append(arr[p][1])
if arr[p][0] in a2:
c=0
while(c<p):
if arr[p][0] in a1[c]:
break
else:
c=c+1
a1[c].append(arr[p][1])
p=p+1
else:
a1[p].append(arr[p][0])
a1[p].append(arr[p][1])
p=p+1
count=0
for z in range(len(a1)):
if(a1[z]!=[]):
count+=1
print(count)
for z in range(len(a1)):
if(a1[z]!=[]):
print(a1[z][0]+' '+a1[z][-1])
```
| 12,866
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
There are two popular keyboard layouts in Berland, they differ only in letters positions. All the other keys are the same. In Berland they use alphabet with 26 letters which coincides with English alphabet.
You are given two strings consisting of 26 distinct letters each: all keys of the first and the second layouts in the same order.
You are also given some text consisting of small and capital English letters and digits. It is known that it was typed in the first layout, but the writer intended to type it in the second layout. Print the text if the same keys were pressed in the second layout.
Since all keys but letters are the same in both layouts, the capitalization of the letters should remain the same, as well as all other characters.
Input
The first line contains a string of length 26 consisting of distinct lowercase English letters. This is the first layout.
The second line contains a string of length 26 consisting of distinct lowercase English letters. This is the second layout.
The third line contains a non-empty string s consisting of lowercase and uppercase English letters and digits. This is the text typed in the first layout. The length of s does not exceed 1000.
Output
Print the text if the same keys were pressed in the second layout.
Examples
Input
qwertyuiopasdfghjklzxcvbnm
veamhjsgqocnrbfxdtwkylupzi
TwccpQZAvb2017
Output
HelloVKCup2017
Input
mnbvcxzlkjhgfdsapoiuytrewq
asdfghjklqwertyuiopzxcvbnm
7abaCABAABAcaba7
Output
7uduGUDUUDUgudu7
Tags: implementation, strings
Correct Solution:
```
a,b=input(),input()
dict={}
d=[]
for x in list(input()):
if x in '0123456789':
d.append(x)
elif x == x.lower():
d.append(b[a.index(x)])
elif x==x.upper():
d.append(b[a.index(x.lower())].upper())
print(''.join(d))
```
| 13,014
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
There are two popular keyboard layouts in Berland, they differ only in letters positions. All the other keys are the same. In Berland they use alphabet with 26 letters which coincides with English alphabet.
You are given two strings consisting of 26 distinct letters each: all keys of the first and the second layouts in the same order.
You are also given some text consisting of small and capital English letters and digits. It is known that it was typed in the first layout, but the writer intended to type it in the second layout. Print the text if the same keys were pressed in the second layout.
Since all keys but letters are the same in both layouts, the capitalization of the letters should remain the same, as well as all other characters.
Input
The first line contains a string of length 26 consisting of distinct lowercase English letters. This is the first layout.
The second line contains a string of length 26 consisting of distinct lowercase English letters. This is the second layout.
The third line contains a non-empty string s consisting of lowercase and uppercase English letters and digits. This is the text typed in the first layout. The length of s does not exceed 1000.
Output
Print the text if the same keys were pressed in the second layout.
Examples
Input
qwertyuiopasdfghjklzxcvbnm
veamhjsgqocnrbfxdtwkylupzi
TwccpQZAvb2017
Output
HelloVKCup2017
Input
mnbvcxzlkjhgfdsapoiuytrewq
asdfghjklqwertyuiopzxcvbnm
7abaCABAABAcaba7
Output
7uduGUDUUDUgudu7
Tags: implementation, strings
Correct Solution:
```
first = input()
second = input()
request = input()
first_d = {}
second_d = {}
for _, c in enumerate(first):
first_d[c] = _
for _, c in enumerate(second):
second_d[_] = c
ans = ""
for c in request:
lower_c = c.lower()
if lower_c not in first:
ans += c
else:
corr_c = second_d[first_d[lower_c]]
if c.lower() == c:
ans += corr_c
else:
ans += corr_c.upper()
print(ans)
```
| 13,015
|
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0.66552734375,
0.53466796875,
0.634765625,
0.111083984375,
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-0.393310546875
] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
There are two popular keyboard layouts in Berland, they differ only in letters positions. All the other keys are the same. In Berland they use alphabet with 26 letters which coincides with English alphabet.
You are given two strings consisting of 26 distinct letters each: all keys of the first and the second layouts in the same order.
You are also given some text consisting of small and capital English letters and digits. It is known that it was typed in the first layout, but the writer intended to type it in the second layout. Print the text if the same keys were pressed in the second layout.
Since all keys but letters are the same in both layouts, the capitalization of the letters should remain the same, as well as all other characters.
Input
The first line contains a string of length 26 consisting of distinct lowercase English letters. This is the first layout.
The second line contains a string of length 26 consisting of distinct lowercase English letters. This is the second layout.
The third line contains a non-empty string s consisting of lowercase and uppercase English letters and digits. This is the text typed in the first layout. The length of s does not exceed 1000.
Output
Print the text if the same keys were pressed in the second layout.
Examples
Input
qwertyuiopasdfghjklzxcvbnm
veamhjsgqocnrbfxdtwkylupzi
TwccpQZAvb2017
Output
HelloVKCup2017
Input
mnbvcxzlkjhgfdsapoiuytrewq
asdfghjklqwertyuiopzxcvbnm
7abaCABAABAcaba7
Output
7uduGUDUUDUgudu7
Tags: implementation, strings
Correct Solution:
```
first = str(input())
second = str(input())
line = (input())
result = ''
for word in line:
if word.isdigit():
result+=word
else:
i = first.find(word)
if i == -1:
i = (first.upper()).find(word)
result += second[i].upper()
else:
result += second[i]
print (result)
```
| 13,016
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
There are two popular keyboard layouts in Berland, they differ only in letters positions. All the other keys are the same. In Berland they use alphabet with 26 letters which coincides with English alphabet.
You are given two strings consisting of 26 distinct letters each: all keys of the first and the second layouts in the same order.
You are also given some text consisting of small and capital English letters and digits. It is known that it was typed in the first layout, but the writer intended to type it in the second layout. Print the text if the same keys were pressed in the second layout.
Since all keys but letters are the same in both layouts, the capitalization of the letters should remain the same, as well as all other characters.
Input
The first line contains a string of length 26 consisting of distinct lowercase English letters. This is the first layout.
The second line contains a string of length 26 consisting of distinct lowercase English letters. This is the second layout.
The third line contains a non-empty string s consisting of lowercase and uppercase English letters and digits. This is the text typed in the first layout. The length of s does not exceed 1000.
Output
Print the text if the same keys were pressed in the second layout.
Examples
Input
qwertyuiopasdfghjklzxcvbnm
veamhjsgqocnrbfxdtwkylupzi
TwccpQZAvb2017
Output
HelloVKCup2017
Input
mnbvcxzlkjhgfdsapoiuytrewq
asdfghjklqwertyuiopzxcvbnm
7abaCABAABAcaba7
Output
7uduGUDUUDUgudu7
Tags: implementation, strings
Correct Solution:
```
a = input()
b = input()
c = input()
dic = {}
for i in range(26):
dic[a[i]] = b[i];
d = ""
for i in range(len(c)):
if c[i].lower() not in a:
d += c[i]
elif c[i].isupper():
d += (dic[c[i].lower()]).upper()
else:
d += dic[c[i]]
print (d)
```
| 13,017
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
There are two popular keyboard layouts in Berland, they differ only in letters positions. All the other keys are the same. In Berland they use alphabet with 26 letters which coincides with English alphabet.
You are given two strings consisting of 26 distinct letters each: all keys of the first and the second layouts in the same order.
You are also given some text consisting of small and capital English letters and digits. It is known that it was typed in the first layout, but the writer intended to type it in the second layout. Print the text if the same keys were pressed in the second layout.
Since all keys but letters are the same in both layouts, the capitalization of the letters should remain the same, as well as all other characters.
Input
The first line contains a string of length 26 consisting of distinct lowercase English letters. This is the first layout.
The second line contains a string of length 26 consisting of distinct lowercase English letters. This is the second layout.
The third line contains a non-empty string s consisting of lowercase and uppercase English letters and digits. This is the text typed in the first layout. The length of s does not exceed 1000.
Output
Print the text if the same keys were pressed in the second layout.
Examples
Input
qwertyuiopasdfghjklzxcvbnm
veamhjsgqocnrbfxdtwkylupzi
TwccpQZAvb2017
Output
HelloVKCup2017
Input
mnbvcxzlkjhgfdsapoiuytrewq
asdfghjklqwertyuiopzxcvbnm
7abaCABAABAcaba7
Output
7uduGUDUUDUgudu7
Tags: implementation, strings
Correct Solution:
```
s1=input()
s2=input()
s3=input()
for i in range(len(s3)):
try:
k=s1.index(s3[i].lower())
if s3[i].lower()==s3[i]:
print(s2[k],end="")
else:
print(s2[k].upper(),end="")
except:
print(s3[i],end="")
```
| 13,018
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
There are two popular keyboard layouts in Berland, they differ only in letters positions. All the other keys are the same. In Berland they use alphabet with 26 letters which coincides with English alphabet.
You are given two strings consisting of 26 distinct letters each: all keys of the first and the second layouts in the same order.
You are also given some text consisting of small and capital English letters and digits. It is known that it was typed in the first layout, but the writer intended to type it in the second layout. Print the text if the same keys were pressed in the second layout.
Since all keys but letters are the same in both layouts, the capitalization of the letters should remain the same, as well as all other characters.
Input
The first line contains a string of length 26 consisting of distinct lowercase English letters. This is the first layout.
The second line contains a string of length 26 consisting of distinct lowercase English letters. This is the second layout.
The third line contains a non-empty string s consisting of lowercase and uppercase English letters and digits. This is the text typed in the first layout. The length of s does not exceed 1000.
Output
Print the text if the same keys were pressed in the second layout.
Examples
Input
qwertyuiopasdfghjklzxcvbnm
veamhjsgqocnrbfxdtwkylupzi
TwccpQZAvb2017
Output
HelloVKCup2017
Input
mnbvcxzlkjhgfdsapoiuytrewq
asdfghjklqwertyuiopzxcvbnm
7abaCABAABAcaba7
Output
7uduGUDUUDUgudu7
Tags: implementation, strings
Correct Solution:
```
x=input()
y=input()
t=input()
r=''
for i in t:
if(i.isupper()):
w=i.lower()
for j in range(26):
if(x[j]==w):
r=r+y[j].upper()
elif(i.islower()):
for j in range(26):
if(x[j]==i):
r=r+y[j]
else:
r=r+i
print(r)
```
| 13,019
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
There are two popular keyboard layouts in Berland, they differ only in letters positions. All the other keys are the same. In Berland they use alphabet with 26 letters which coincides with English alphabet.
You are given two strings consisting of 26 distinct letters each: all keys of the first and the second layouts in the same order.
You are also given some text consisting of small and capital English letters and digits. It is known that it was typed in the first layout, but the writer intended to type it in the second layout. Print the text if the same keys were pressed in the second layout.
Since all keys but letters are the same in both layouts, the capitalization of the letters should remain the same, as well as all other characters.
Input
The first line contains a string of length 26 consisting of distinct lowercase English letters. This is the first layout.
The second line contains a string of length 26 consisting of distinct lowercase English letters. This is the second layout.
The third line contains a non-empty string s consisting of lowercase and uppercase English letters and digits. This is the text typed in the first layout. The length of s does not exceed 1000.
Output
Print the text if the same keys were pressed in the second layout.
Examples
Input
qwertyuiopasdfghjklzxcvbnm
veamhjsgqocnrbfxdtwkylupzi
TwccpQZAvb2017
Output
HelloVKCup2017
Input
mnbvcxzlkjhgfdsapoiuytrewq
asdfghjklqwertyuiopzxcvbnm
7abaCABAABAcaba7
Output
7uduGUDUUDUgudu7
Tags: implementation, strings
Correct Solution:
```
s = input()
t = input()
d = {}
for i in range(26):
d[s[i]] = t[i]
w = input()
result = ''
for i in range(len(w)):
if w[i].isupper() and 65 <= ord(w[i]) <= 90:
result += d[w[i].lower()].upper()
elif 97 <= ord(w[i]) <= 122:
result += d[w[i]]
else:
result += w[i]
print(result)
```
| 13,020
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
There are two popular keyboard layouts in Berland, they differ only in letters positions. All the other keys are the same. In Berland they use alphabet with 26 letters which coincides with English alphabet.
You are given two strings consisting of 26 distinct letters each: all keys of the first and the second layouts in the same order.
You are also given some text consisting of small and capital English letters and digits. It is known that it was typed in the first layout, but the writer intended to type it in the second layout. Print the text if the same keys were pressed in the second layout.
Since all keys but letters are the same in both layouts, the capitalization of the letters should remain the same, as well as all other characters.
Input
The first line contains a string of length 26 consisting of distinct lowercase English letters. This is the first layout.
The second line contains a string of length 26 consisting of distinct lowercase English letters. This is the second layout.
The third line contains a non-empty string s consisting of lowercase and uppercase English letters and digits. This is the text typed in the first layout. The length of s does not exceed 1000.
Output
Print the text if the same keys were pressed in the second layout.
Examples
Input
qwertyuiopasdfghjklzxcvbnm
veamhjsgqocnrbfxdtwkylupzi
TwccpQZAvb2017
Output
HelloVKCup2017
Input
mnbvcxzlkjhgfdsapoiuytrewq
asdfghjklqwertyuiopzxcvbnm
7abaCABAABAcaba7
Output
7uduGUDUUDUgudu7
Tags: implementation, strings
Correct Solution:
```
a = input()
b = input()
c = input()
d = dict((a[i], b[i]) for i in range(0, len(a)))
s = ''
for _ in c:
if _.isupper():
_ = d[_.lower()].upper()
elif _.islower():
_ = d[_]
s += _
print(s)
```
| 13,021
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
You can not just take the file and send it. When Polycarp trying to send a file in the social network "Codehorses", he encountered an unexpected problem. If the name of the file contains three or more "x" (lowercase Latin letters "x") in a row, the system considers that the file content does not correspond to the social network topic. In this case, the file is not sent and an error message is displayed.
Determine the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. Print 0 if the file name does not initially contain a forbidden substring "xxx".
You can delete characters in arbitrary positions (not necessarily consecutive). If you delete a character, then the length of a string is reduced by 1. For example, if you delete the character in the position 2 from the string "exxxii", then the resulting string is "exxii".
Input
The first line contains integer n (3 ≤ n ≤ 100) — the length of the file name.
The second line contains a string of length n consisting of lowercase Latin letters only — the file name.
Output
Print the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. If initially the file name dost not contain a forbidden substring "xxx", print 0.
Examples
Input
6
xxxiii
Output
1
Input
5
xxoxx
Output
0
Input
10
xxxxxxxxxx
Output
8
Note
In the first example Polycarp tried to send a file with name contains number 33, written in Roman numerals. But he can not just send the file, because it name contains three letters "x" in a row. To send the file he needs to remove any one of this letters.
Tags: greedy, strings
Correct Solution:
```
length = int(input())
name = input()
i = 0
count =0
while i < length - 2:
if name[i] == name[i+1] == name[i+2] == 'x':
count+=1
else:
pass
i+=1
print(count)
```
| 13,076
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
You can not just take the file and send it. When Polycarp trying to send a file in the social network "Codehorses", he encountered an unexpected problem. If the name of the file contains three or more "x" (lowercase Latin letters "x") in a row, the system considers that the file content does not correspond to the social network topic. In this case, the file is not sent and an error message is displayed.
Determine the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. Print 0 if the file name does not initially contain a forbidden substring "xxx".
You can delete characters in arbitrary positions (not necessarily consecutive). If you delete a character, then the length of a string is reduced by 1. For example, if you delete the character in the position 2 from the string "exxxii", then the resulting string is "exxii".
Input
The first line contains integer n (3 ≤ n ≤ 100) — the length of the file name.
The second line contains a string of length n consisting of lowercase Latin letters only — the file name.
Output
Print the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. If initially the file name dost not contain a forbidden substring "xxx", print 0.
Examples
Input
6
xxxiii
Output
1
Input
5
xxoxx
Output
0
Input
10
xxxxxxxxxx
Output
8
Note
In the first example Polycarp tried to send a file with name contains number 33, written in Roman numerals. But he can not just send the file, because it name contains three letters "x" in a row. To send the file he needs to remove any one of this letters.
Tags: greedy, strings
Correct Solution:
```
n = int(input())
counter = 0
delete = 0
s = input()
for c in s:
if c == 'x':
counter += 1
else:
delete += max(counter-2,0)
counter = 0
if counter != 0:
delete += max(counter-2,0)
print(delete)
```
| 13,077
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
You can not just take the file and send it. When Polycarp trying to send a file in the social network "Codehorses", he encountered an unexpected problem. If the name of the file contains three or more "x" (lowercase Latin letters "x") in a row, the system considers that the file content does not correspond to the social network topic. In this case, the file is not sent and an error message is displayed.
Determine the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. Print 0 if the file name does not initially contain a forbidden substring "xxx".
You can delete characters in arbitrary positions (not necessarily consecutive). If you delete a character, then the length of a string is reduced by 1. For example, if you delete the character in the position 2 from the string "exxxii", then the resulting string is "exxii".
Input
The first line contains integer n (3 ≤ n ≤ 100) — the length of the file name.
The second line contains a string of length n consisting of lowercase Latin letters only — the file name.
Output
Print the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. If initially the file name dost not contain a forbidden substring "xxx", print 0.
Examples
Input
6
xxxiii
Output
1
Input
5
xxoxx
Output
0
Input
10
xxxxxxxxxx
Output
8
Note
In the first example Polycarp tried to send a file with name contains number 33, written in Roman numerals. But he can not just send the file, because it name contains three letters "x" in a row. To send the file he needs to remove any one of this letters.
Tags: greedy, strings
Correct Solution:
```
n=int(input())
s=list(input())
i,a,b=0,2,0#要给a一个初值，否则如果#2没有执行到的话，a就没有定义
while i<=n-3:
if s[i]==s[i+1]=='x':#2
a=i+2
if s[a]=='x':
while s[a]=='x':
b+=1
a+=1
i=a
if a==n:
break #会打破while循环，如果下面的代码在for循环内就执行下面的
else: #代码，否则进入下一个for循环
i+=1
if a==n:
break
else:
i+=1
print(b)
```
| 13,078
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
You can not just take the file and send it. When Polycarp trying to send a file in the social network "Codehorses", he encountered an unexpected problem. If the name of the file contains three or more "x" (lowercase Latin letters "x") in a row, the system considers that the file content does not correspond to the social network topic. In this case, the file is not sent and an error message is displayed.
Determine the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. Print 0 if the file name does not initially contain a forbidden substring "xxx".
You can delete characters in arbitrary positions (not necessarily consecutive). If you delete a character, then the length of a string is reduced by 1. For example, if you delete the character in the position 2 from the string "exxxii", then the resulting string is "exxii".
Input
The first line contains integer n (3 ≤ n ≤ 100) — the length of the file name.
The second line contains a string of length n consisting of lowercase Latin letters only — the file name.
Output
Print the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. If initially the file name dost not contain a forbidden substring "xxx", print 0.
Examples
Input
6
xxxiii
Output
1
Input
5
xxoxx
Output
0
Input
10
xxxxxxxxxx
Output
8
Note
In the first example Polycarp tried to send a file with name contains number 33, written in Roman numerals. But he can not just send the file, because it name contains three letters "x" in a row. To send the file he needs to remove any one of this letters.
Tags: greedy, strings
Correct Solution:
```
input()
s = input()
ans = 0
while s.count('xxx'):
i = s.find('xxx')
s = s[:i] + s[i + 1:]
ans += 1
print(ans)
```
| 13,079
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
You can not just take the file and send it. When Polycarp trying to send a file in the social network "Codehorses", he encountered an unexpected problem. If the name of the file contains three or more "x" (lowercase Latin letters "x") in a row, the system considers that the file content does not correspond to the social network topic. In this case, the file is not sent and an error message is displayed.
Determine the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. Print 0 if the file name does not initially contain a forbidden substring "xxx".
You can delete characters in arbitrary positions (not necessarily consecutive). If you delete a character, then the length of a string is reduced by 1. For example, if you delete the character in the position 2 from the string "exxxii", then the resulting string is "exxii".
Input
The first line contains integer n (3 ≤ n ≤ 100) — the length of the file name.
The second line contains a string of length n consisting of lowercase Latin letters only — the file name.
Output
Print the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. If initially the file name dost not contain a forbidden substring "xxx", print 0.
Examples
Input
6
xxxiii
Output
1
Input
5
xxoxx
Output
0
Input
10
xxxxxxxxxx
Output
8
Note
In the first example Polycarp tried to send a file with name contains number 33, written in Roman numerals. But he can not just send the file, because it name contains three letters "x" in a row. To send the file he needs to remove any one of this letters.
Tags: greedy, strings
Correct Solution:
```
a = int(input())
s = input()
if a ==2 or a==1:
print(0)
else:
b = 0
for i in range(a-2):
if s[i] == s[i+1] == s[i+2] == 'x':
b+=1
else:
pass
print(b)
```
| 13,080
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
You can not just take the file and send it. When Polycarp trying to send a file in the social network "Codehorses", he encountered an unexpected problem. If the name of the file contains three or more "x" (lowercase Latin letters "x") in a row, the system considers that the file content does not correspond to the social network topic. In this case, the file is not sent and an error message is displayed.
Determine the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. Print 0 if the file name does not initially contain a forbidden substring "xxx".
You can delete characters in arbitrary positions (not necessarily consecutive). If you delete a character, then the length of a string is reduced by 1. For example, if you delete the character in the position 2 from the string "exxxii", then the resulting string is "exxii".
Input
The first line contains integer n (3 ≤ n ≤ 100) — the length of the file name.
The second line contains a string of length n consisting of lowercase Latin letters only — the file name.
Output
Print the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. If initially the file name dost not contain a forbidden substring "xxx", print 0.
Examples
Input
6
xxxiii
Output
1
Input
5
xxoxx
Output
0
Input
10
xxxxxxxxxx
Output
8
Note
In the first example Polycarp tried to send a file with name contains number 33, written in Roman numerals. But he can not just send the file, because it name contains three letters "x" in a row. To send the file he needs to remove any one of this letters.
Tags: greedy, strings
Correct Solution:
```
input()
a = list(input())
i = 1
c = 0
while i < len(a)-1:
if a[i] == 'x' and a[i - 1] == 'x' and a[i + 1] == 'x':
del a[i]
c += 1
else:
i += 1
print(c)
```
| 13,081
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
You can not just take the file and send it. When Polycarp trying to send a file in the social network "Codehorses", he encountered an unexpected problem. If the name of the file contains three or more "x" (lowercase Latin letters "x") in a row, the system considers that the file content does not correspond to the social network topic. In this case, the file is not sent and an error message is displayed.
Determine the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. Print 0 if the file name does not initially contain a forbidden substring "xxx".
You can delete characters in arbitrary positions (not necessarily consecutive). If you delete a character, then the length of a string is reduced by 1. For example, if you delete the character in the position 2 from the string "exxxii", then the resulting string is "exxii".
Input
The first line contains integer n (3 ≤ n ≤ 100) — the length of the file name.
The second line contains a string of length n consisting of lowercase Latin letters only — the file name.
Output
Print the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. If initially the file name dost not contain a forbidden substring "xxx", print 0.
Examples
Input
6
xxxiii
Output
1
Input
5
xxoxx
Output
0
Input
10
xxxxxxxxxx
Output
8
Note
In the first example Polycarp tried to send a file with name contains number 33, written in Roman numerals. But he can not just send the file, because it name contains three letters "x" in a row. To send the file he needs to remove any one of this letters.
Tags: greedy, strings
Correct Solution:
```
n = int(input())
s = list(input())
con = 0
mov = 0
for i in range(n):
if s[i]=='x':
con+=1
else:
con=0
if con==3:
mov+=1
if (i+1)<n and s[i+1]=='x':
con=2
else:
con=0
print(mov)
```
| 13,082
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
You can not just take the file and send it. When Polycarp trying to send a file in the social network "Codehorses", he encountered an unexpected problem. If the name of the file contains three or more "x" (lowercase Latin letters "x") in a row, the system considers that the file content does not correspond to the social network topic. In this case, the file is not sent and an error message is displayed.
Determine the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. Print 0 if the file name does not initially contain a forbidden substring "xxx".
You can delete characters in arbitrary positions (not necessarily consecutive). If you delete a character, then the length of a string is reduced by 1. For example, if you delete the character in the position 2 from the string "exxxii", then the resulting string is "exxii".
Input
The first line contains integer n (3 ≤ n ≤ 100) — the length of the file name.
The second line contains a string of length n consisting of lowercase Latin letters only — the file name.
Output
Print the minimum number of characters to remove from the file name so after that the name does not contain "xxx" as a substring. If initially the file name dost not contain a forbidden substring "xxx", print 0.
Examples
Input
6
xxxiii
Output
1
Input
5
xxoxx
Output
0
Input
10
xxxxxxxxxx
Output
8
Note
In the first example Polycarp tried to send a file with name contains number 33, written in Roman numerals. But he can not just send the file, because it name contains three letters "x" in a row. To send the file he needs to remove any one of this letters.
Tags: greedy, strings
Correct Solution:
```
x = int(input())
t = input()
t1 = 0
r = 0
for i in range(x):
if t[i] == "x":
r = r + 1
else:
r = 0
if r >= 3:
t1 = t1 + 1
print(t1)
```
| 13,083
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
AquaMoon had n strings of length m each. n is an odd number.
When AquaMoon was gone, Cirno tried to pair these n strings together. After making (n-1)/(2) pairs, she found out that there was exactly one string without the pair!
In her rage, she disrupted each pair of strings. For each pair, she selected some positions (at least 1 and at most m) and swapped the letters in the two strings of this pair at the selected positions.
For example, if m = 6 and two strings "abcdef" and "xyzklm" are in one pair and Cirno selected positions 2, 3 and 6 she will swap 'b' with 'y', 'c' with 'z' and 'f' with 'm'. The resulting strings will be "ayzdem" and "xbcklf".
Cirno then stole away the string without pair and shuffled all remaining strings in arbitrary order.
AquaMoon found the remaining n-1 strings in complete disarray. Also, she remembers the initial n strings. She wants to know which string was stolen, but she is not good at programming. Can you help her?
Input
This problem is made as interactive. It means, that your solution will read the input, given by the interactor. But the interactor will give you the full input at the beginning and after that, you should print the answer. So you should solve the problem, like as you solve the usual, non-interactive problem because you won't have any interaction process. The only thing you should not forget is to flush the output buffer, after printing the answer. Otherwise, you can get an "Idleness limit exceeded" verdict. Refer to the [interactive problems guide](https://codeforces.com/blog/entry/45307) for the detailed information about flushing the output buffer.
The input consists of multiple test cases. The first line contains a single integer t (1 ≤ t ≤ 100) — the number of test cases.
The first line of each test case contains two integers n, m (1 ≤ n ≤ 10^5, 1 ≤ m ≤ 10^5) — the number of strings and the length of each string, respectively.
The next n lines each contain a string with length m, describing the original n strings. All string consists of lowercase Latin letters.
The next n-1 lines each contain a string with length m, describing the strings after Cirno exchanged and reordered them.
It is guaranteed that n is odd and that the sum of n ⋅ m over all test cases does not exceed 10^5.
Hack format:
The first line should contain a single integer t. After that t test cases should follow in the following format:
The first line should contain two integers n and m.
The following n lines should contain n strings of length m, describing the original strings.
The following (n-1)/(2) lines should describe the pairs. They should contain, in the following order: the index of the first string i (1 ≤ i ≤ n), the index of the second string j (1 ≤ j ≤ n, i ≠ j), the number of exchanged positions k (1 ≤ k ≤ m), and the list of k positions that are exchanged (k distinct indices from 1 to m in any order).
The final line should contain a permutation of integers from 1 to n, describing the way the strings should be reordered. The strings will be placed in the order indices placed in this permutation, the stolen string index will be ignored.
Output
For each test case print a single line with the stolen string.
Example
Input
3
3 5
aaaaa
bbbbb
ccccc
aaaaa
bbbbb
3 4
aaaa
bbbb
cccc
aabb
bbaa
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
xbcklf
eueueu
ayzdem
ukukuk
Output
ccccc
cccc
kekeke
Note
In the first test case, "aaaaa" and "bbbbb" exchanged all positions, and "ccccc" is the stolen string.
In the second test case, "aaaa" and "bbbb" exchanged two first positions, and "cccc" is the stolen string.
This is the first test in the hack format:
3
3 5
aaaaa
bbbbb
ccccc
1 2 5 1 2 3 4 5
2 1 3
3 4
aaaa
bbbb
cccc
1 2 2 1 2
2 1 3
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
1 5 3 2 3 6
2 4 3 2 4 6
5 4 1 2 3
Tags: interactive, math
Correct Solution:
```
alpha = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']
def stringsum(a):
ans = 0
for x in a:
ans+=alpha.index(x)
return ans
t = int(input())
for i in range(t):
n,m = list(map(int,input().strip().split()))
ostrings = []
rstrings = []
bsum1=[]
bsum2=[]
bsum3 = []
for i in range(n):
ostrings.append(input())
for i in range(n-1):
rstrings.append(input())
for i in range(m):
s=0
for j in range(n):
s+= alpha.index(ostrings[j][i])
bsum1.append(s)
for i in range(m):
s = 0
for j in range(n-1):
s+=alpha.index(rstrings[j][i])
bsum2.append(s)
for i in range(m):
bsum3.append(bsum1[i]-bsum2[i])
ans = ''
for x in bsum3:
ans = ans+alpha[x]
print(ans)
```
| 13,548
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
AquaMoon had n strings of length m each. n is an odd number.
When AquaMoon was gone, Cirno tried to pair these n strings together. After making (n-1)/(2) pairs, she found out that there was exactly one string without the pair!
In her rage, she disrupted each pair of strings. For each pair, she selected some positions (at least 1 and at most m) and swapped the letters in the two strings of this pair at the selected positions.
For example, if m = 6 and two strings "abcdef" and "xyzklm" are in one pair and Cirno selected positions 2, 3 and 6 she will swap 'b' with 'y', 'c' with 'z' and 'f' with 'm'. The resulting strings will be "ayzdem" and "xbcklf".
Cirno then stole away the string without pair and shuffled all remaining strings in arbitrary order.
AquaMoon found the remaining n-1 strings in complete disarray. Also, she remembers the initial n strings. She wants to know which string was stolen, but she is not good at programming. Can you help her?
Input
This problem is made as interactive. It means, that your solution will read the input, given by the interactor. But the interactor will give you the full input at the beginning and after that, you should print the answer. So you should solve the problem, like as you solve the usual, non-interactive problem because you won't have any interaction process. The only thing you should not forget is to flush the output buffer, after printing the answer. Otherwise, you can get an "Idleness limit exceeded" verdict. Refer to the [interactive problems guide](https://codeforces.com/blog/entry/45307) for the detailed information about flushing the output buffer.
The input consists of multiple test cases. The first line contains a single integer t (1 ≤ t ≤ 100) — the number of test cases.
The first line of each test case contains two integers n, m (1 ≤ n ≤ 10^5, 1 ≤ m ≤ 10^5) — the number of strings and the length of each string, respectively.
The next n lines each contain a string with length m, describing the original n strings. All string consists of lowercase Latin letters.
The next n-1 lines each contain a string with length m, describing the strings after Cirno exchanged and reordered them.
It is guaranteed that n is odd and that the sum of n ⋅ m over all test cases does not exceed 10^5.
Hack format:
The first line should contain a single integer t. After that t test cases should follow in the following format:
The first line should contain two integers n and m.
The following n lines should contain n strings of length m, describing the original strings.
The following (n-1)/(2) lines should describe the pairs. They should contain, in the following order: the index of the first string i (1 ≤ i ≤ n), the index of the second string j (1 ≤ j ≤ n, i ≠ j), the number of exchanged positions k (1 ≤ k ≤ m), and the list of k positions that are exchanged (k distinct indices from 1 to m in any order).
The final line should contain a permutation of integers from 1 to n, describing the way the strings should be reordered. The strings will be placed in the order indices placed in this permutation, the stolen string index will be ignored.
Output
For each test case print a single line with the stolen string.
Example
Input
3
3 5
aaaaa
bbbbb
ccccc
aaaaa
bbbbb
3 4
aaaa
bbbb
cccc
aabb
bbaa
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
xbcklf
eueueu
ayzdem
ukukuk
Output
ccccc
cccc
kekeke
Note
In the first test case, "aaaaa" and "bbbbb" exchanged all positions, and "ccccc" is the stolen string.
In the second test case, "aaaa" and "bbbb" exchanged two first positions, and "cccc" is the stolen string.
This is the first test in the hack format:
3
3 5
aaaaa
bbbbb
ccccc
1 2 5 1 2 3 4 5
2 1 3
3 4
aaaa
bbbb
cccc
1 2 2 1 2
2 1 3
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
1 5 3 2 3 6
2 4 3 2 4 6
5 4 1 2 3
Tags: interactive, math
Correct Solution:
```
t = int(input())
# testcases
for tests in range(t):
# plz don't copy the code, to avoid plagiarism issue
n,m = [int(i) for i in input().split(' ')]
hash_chrs = [{} for i in range(m)]
for i in range(n):
inp = input()
# plz don't copy the code, to avoid plagiarism issue
for j in range(m):
if inp[j] in hash_chrs[j].keys():
hash_chrs[j][inp[j]] = hash_chrs[j][inp[j]]+1
else:
hash_chrs[j][inp[j]] = 1
# plz don't copy the code, to avoid plagiarism issue
for i in range(n-1):
inp = input()
for j in range(m):
hash_chrs[j][inp[j]] = hash_chrs[j][inp[j]]-1
# plz don't copy the code, to avoid plagiarism issue
sol = ''
for i in range(m):
for key in hash_chrs[i].keys():
if hash_chrs[i][key]>0:
sol+=key
print(sol)
# plz don't copy the code, to avoid plagiarism issue
########################################################################################
```
| 13,549
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
AquaMoon had n strings of length m each. n is an odd number.
When AquaMoon was gone, Cirno tried to pair these n strings together. After making (n-1)/(2) pairs, she found out that there was exactly one string without the pair!
In her rage, she disrupted each pair of strings. For each pair, she selected some positions (at least 1 and at most m) and swapped the letters in the two strings of this pair at the selected positions.
For example, if m = 6 and two strings "abcdef" and "xyzklm" are in one pair and Cirno selected positions 2, 3 and 6 she will swap 'b' with 'y', 'c' with 'z' and 'f' with 'm'. The resulting strings will be "ayzdem" and "xbcklf".
Cirno then stole away the string without pair and shuffled all remaining strings in arbitrary order.
AquaMoon found the remaining n-1 strings in complete disarray. Also, she remembers the initial n strings. She wants to know which string was stolen, but she is not good at programming. Can you help her?
Input
This problem is made as interactive. It means, that your solution will read the input, given by the interactor. But the interactor will give you the full input at the beginning and after that, you should print the answer. So you should solve the problem, like as you solve the usual, non-interactive problem because you won't have any interaction process. The only thing you should not forget is to flush the output buffer, after printing the answer. Otherwise, you can get an "Idleness limit exceeded" verdict. Refer to the [interactive problems guide](https://codeforces.com/blog/entry/45307) for the detailed information about flushing the output buffer.
The input consists of multiple test cases. The first line contains a single integer t (1 ≤ t ≤ 100) — the number of test cases.
The first line of each test case contains two integers n, m (1 ≤ n ≤ 10^5, 1 ≤ m ≤ 10^5) — the number of strings and the length of each string, respectively.
The next n lines each contain a string with length m, describing the original n strings. All string consists of lowercase Latin letters.
The next n-1 lines each contain a string with length m, describing the strings after Cirno exchanged and reordered them.
It is guaranteed that n is odd and that the sum of n ⋅ m over all test cases does not exceed 10^5.
Hack format:
The first line should contain a single integer t. After that t test cases should follow in the following format:
The first line should contain two integers n and m.
The following n lines should contain n strings of length m, describing the original strings.
The following (n-1)/(2) lines should describe the pairs. They should contain, in the following order: the index of the first string i (1 ≤ i ≤ n), the index of the second string j (1 ≤ j ≤ n, i ≠ j), the number of exchanged positions k (1 ≤ k ≤ m), and the list of k positions that are exchanged (k distinct indices from 1 to m in any order).
The final line should contain a permutation of integers from 1 to n, describing the way the strings should be reordered. The strings will be placed in the order indices placed in this permutation, the stolen string index will be ignored.
Output
For each test case print a single line with the stolen string.
Example
Input
3
3 5
aaaaa
bbbbb
ccccc
aaaaa
bbbbb
3 4
aaaa
bbbb
cccc
aabb
bbaa
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
xbcklf
eueueu
ayzdem
ukukuk
Output
ccccc
cccc
kekeke
Note
In the first test case, "aaaaa" and "bbbbb" exchanged all positions, and "ccccc" is the stolen string.
In the second test case, "aaaa" and "bbbb" exchanged two first positions, and "cccc" is the stolen string.
This is the first test in the hack format:
3
3 5
aaaaa
bbbbb
ccccc
1 2 5 1 2 3 4 5
2 1 3
3 4
aaaa
bbbb
cccc
1 2 2 1 2
2 1 3
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
1 5 3 2 3 6
2 4 3 2 4 6
5 4 1 2 3
Tags: interactive, math
Correct Solution:
```
import sys
input = sys.stdin.readline
def solve():
n, m = map(int, input().split())
original = [input() for _ in range(n)]
modified = [input() for _ in range(n-1)]
stolen_chars = []
for j in range(m):
chars_available = 0
for i in range(n):
chars_available += ord(original[i][j])
for i in range(n-1):
chars_available -= ord(modified[i][j])
stolen_chars.append(chr(chars_available))
return ''.join(stolen_chars)
t = int(input())
output = []
for _ in range(t):
print(solve())
sys.stdout.flush()
```
| 13,550
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
AquaMoon had n strings of length m each. n is an odd number.
When AquaMoon was gone, Cirno tried to pair these n strings together. After making (n-1)/(2) pairs, she found out that there was exactly one string without the pair!
In her rage, she disrupted each pair of strings. For each pair, she selected some positions (at least 1 and at most m) and swapped the letters in the two strings of this pair at the selected positions.
For example, if m = 6 and two strings "abcdef" and "xyzklm" are in one pair and Cirno selected positions 2, 3 and 6 she will swap 'b' with 'y', 'c' with 'z' and 'f' with 'm'. The resulting strings will be "ayzdem" and "xbcklf".
Cirno then stole away the string without pair and shuffled all remaining strings in arbitrary order.
AquaMoon found the remaining n-1 strings in complete disarray. Also, she remembers the initial n strings. She wants to know which string was stolen, but she is not good at programming. Can you help her?
Input
This problem is made as interactive. It means, that your solution will read the input, given by the interactor. But the interactor will give you the full input at the beginning and after that, you should print the answer. So you should solve the problem, like as you solve the usual, non-interactive problem because you won't have any interaction process. The only thing you should not forget is to flush the output buffer, after printing the answer. Otherwise, you can get an "Idleness limit exceeded" verdict. Refer to the [interactive problems guide](https://codeforces.com/blog/entry/45307) for the detailed information about flushing the output buffer.
The input consists of multiple test cases. The first line contains a single integer t (1 ≤ t ≤ 100) — the number of test cases.
The first line of each test case contains two integers n, m (1 ≤ n ≤ 10^5, 1 ≤ m ≤ 10^5) — the number of strings and the length of each string, respectively.
The next n lines each contain a string with length m, describing the original n strings. All string consists of lowercase Latin letters.
The next n-1 lines each contain a string with length m, describing the strings after Cirno exchanged and reordered them.
It is guaranteed that n is odd and that the sum of n ⋅ m over all test cases does not exceed 10^5.
Hack format:
The first line should contain a single integer t. After that t test cases should follow in the following format:
The first line should contain two integers n and m.
The following n lines should contain n strings of length m, describing the original strings.
The following (n-1)/(2) lines should describe the pairs. They should contain, in the following order: the index of the first string i (1 ≤ i ≤ n), the index of the second string j (1 ≤ j ≤ n, i ≠ j), the number of exchanged positions k (1 ≤ k ≤ m), and the list of k positions that are exchanged (k distinct indices from 1 to m in any order).
The final line should contain a permutation of integers from 1 to n, describing the way the strings should be reordered. The strings will be placed in the order indices placed in this permutation, the stolen string index will be ignored.
Output
For each test case print a single line with the stolen string.
Example
Input
3
3 5
aaaaa
bbbbb
ccccc
aaaaa
bbbbb
3 4
aaaa
bbbb
cccc
aabb
bbaa
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
xbcklf
eueueu
ayzdem
ukukuk
Output
ccccc
cccc
kekeke
Note
In the first test case, "aaaaa" and "bbbbb" exchanged all positions, and "ccccc" is the stolen string.
In the second test case, "aaaa" and "bbbb" exchanged two first positions, and "cccc" is the stolen string.
This is the first test in the hack format:
3
3 5
aaaaa
bbbbb
ccccc
1 2 5 1 2 3 4 5
2 1 3
3 4
aaaa
bbbb
cccc
1 2 2 1 2
2 1 3
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
1 5 3 2 3 6
2 4 3 2 4 6
5 4 1 2 3
Tags: interactive, math
Correct Solution:
```
import sys
from bisect import bisect
from math import sqrt, ceil, floor
def input(): return sys.stdin.readline().strip()
def iinput(): return int(input())
def rinput(): return map(int, sys.stdin.readline().strip().split())
def get_list(): return list(map(int, sys.stdin.readline().strip().split()))
mod = int(1e9)+7
for _ in range(iinput()):
n, m = rinput()
l = [{} for _ in range(m)]
ans = ""
for _ in range(n):
s = input()
for i in range(m):
l[i][s[i]] = l[i].get(s[i], 0) + 1
for _ in range(n-1):
s = input()
for i in range(m):
l[i][s[i]] = l[i].get(s[i], 0) + 1
for i in range(m):
for key in l[i]:
if l[i][key]%2 == 1:
ans += key
break
print(ans)
```
| 13,551
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
AquaMoon had n strings of length m each. n is an odd number.
When AquaMoon was gone, Cirno tried to pair these n strings together. After making (n-1)/(2) pairs, she found out that there was exactly one string without the pair!
In her rage, she disrupted each pair of strings. For each pair, she selected some positions (at least 1 and at most m) and swapped the letters in the two strings of this pair at the selected positions.
For example, if m = 6 and two strings "abcdef" and "xyzklm" are in one pair and Cirno selected positions 2, 3 and 6 she will swap 'b' with 'y', 'c' with 'z' and 'f' with 'm'. The resulting strings will be "ayzdem" and "xbcklf".
Cirno then stole away the string without pair and shuffled all remaining strings in arbitrary order.
AquaMoon found the remaining n-1 strings in complete disarray. Also, she remembers the initial n strings. She wants to know which string was stolen, but she is not good at programming. Can you help her?
Input
This problem is made as interactive. It means, that your solution will read the input, given by the interactor. But the interactor will give you the full input at the beginning and after that, you should print the answer. So you should solve the problem, like as you solve the usual, non-interactive problem because you won't have any interaction process. The only thing you should not forget is to flush the output buffer, after printing the answer. Otherwise, you can get an "Idleness limit exceeded" verdict. Refer to the [interactive problems guide](https://codeforces.com/blog/entry/45307) for the detailed information about flushing the output buffer.
The input consists of multiple test cases. The first line contains a single integer t (1 ≤ t ≤ 100) — the number of test cases.
The first line of each test case contains two integers n, m (1 ≤ n ≤ 10^5, 1 ≤ m ≤ 10^5) — the number of strings and the length of each string, respectively.
The next n lines each contain a string with length m, describing the original n strings. All string consists of lowercase Latin letters.
The next n-1 lines each contain a string with length m, describing the strings after Cirno exchanged and reordered them.
It is guaranteed that n is odd and that the sum of n ⋅ m over all test cases does not exceed 10^5.
Hack format:
The first line should contain a single integer t. After that t test cases should follow in the following format:
The first line should contain two integers n and m.
The following n lines should contain n strings of length m, describing the original strings.
The following (n-1)/(2) lines should describe the pairs. They should contain, in the following order: the index of the first string i (1 ≤ i ≤ n), the index of the second string j (1 ≤ j ≤ n, i ≠ j), the number of exchanged positions k (1 ≤ k ≤ m), and the list of k positions that are exchanged (k distinct indices from 1 to m in any order).
The final line should contain a permutation of integers from 1 to n, describing the way the strings should be reordered. The strings will be placed in the order indices placed in this permutation, the stolen string index will be ignored.
Output
For each test case print a single line with the stolen string.
Example
Input
3
3 5
aaaaa
bbbbb
ccccc
aaaaa
bbbbb
3 4
aaaa
bbbb
cccc
aabb
bbaa
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
xbcklf
eueueu
ayzdem
ukukuk
Output
ccccc
cccc
kekeke
Note
In the first test case, "aaaaa" and "bbbbb" exchanged all positions, and "ccccc" is the stolen string.
In the second test case, "aaaa" and "bbbb" exchanged two first positions, and "cccc" is the stolen string.
This is the first test in the hack format:
3
3 5
aaaaa
bbbbb
ccccc
1 2 5 1 2 3 4 5
2 1 3
3 4
aaaa
bbbb
cccc
1 2 2 1 2
2 1 3
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
1 5 3 2 3 6
2 4 3 2 4 6
5 4 1 2 3
Tags: interactive, math
Correct Solution:
```
import sys
from string import ascii_lowercase as alph
t = int(input())
for _ in range(t):
n, m = map(int, input().split())
cnt = [0] * m
for i in range(n):
ind = 0
for x in input():
cnt[ind] += alph.index(x) + 1
ind += 1
for i in range(n - 1):
ind = 0
for x in input():
cnt[ind] -= alph.index(x) + 1
ind += 1
for i in range(m):
ind = cnt[i]
if ind != 0:
print(alph[ind - 1], end='')
print()
sys.stdout.flush()
```
| 13,552
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
AquaMoon had n strings of length m each. n is an odd number.
When AquaMoon was gone, Cirno tried to pair these n strings together. After making (n-1)/(2) pairs, she found out that there was exactly one string without the pair!
In her rage, she disrupted each pair of strings. For each pair, she selected some positions (at least 1 and at most m) and swapped the letters in the two strings of this pair at the selected positions.
For example, if m = 6 and two strings "abcdef" and "xyzklm" are in one pair and Cirno selected positions 2, 3 and 6 she will swap 'b' with 'y', 'c' with 'z' and 'f' with 'm'. The resulting strings will be "ayzdem" and "xbcklf".
Cirno then stole away the string without pair and shuffled all remaining strings in arbitrary order.
AquaMoon found the remaining n-1 strings in complete disarray. Also, she remembers the initial n strings. She wants to know which string was stolen, but she is not good at programming. Can you help her?
Input
This problem is made as interactive. It means, that your solution will read the input, given by the interactor. But the interactor will give you the full input at the beginning and after that, you should print the answer. So you should solve the problem, like as you solve the usual, non-interactive problem because you won't have any interaction process. The only thing you should not forget is to flush the output buffer, after printing the answer. Otherwise, you can get an "Idleness limit exceeded" verdict. Refer to the [interactive problems guide](https://codeforces.com/blog/entry/45307) for the detailed information about flushing the output buffer.
The input consists of multiple test cases. The first line contains a single integer t (1 ≤ t ≤ 100) — the number of test cases.
The first line of each test case contains two integers n, m (1 ≤ n ≤ 10^5, 1 ≤ m ≤ 10^5) — the number of strings and the length of each string, respectively.
The next n lines each contain a string with length m, describing the original n strings. All string consists of lowercase Latin letters.
The next n-1 lines each contain a string with length m, describing the strings after Cirno exchanged and reordered them.
It is guaranteed that n is odd and that the sum of n ⋅ m over all test cases does not exceed 10^5.
Hack format:
The first line should contain a single integer t. After that t test cases should follow in the following format:
The first line should contain two integers n and m.
The following n lines should contain n strings of length m, describing the original strings.
The following (n-1)/(2) lines should describe the pairs. They should contain, in the following order: the index of the first string i (1 ≤ i ≤ n), the index of the second string j (1 ≤ j ≤ n, i ≠ j), the number of exchanged positions k (1 ≤ k ≤ m), and the list of k positions that are exchanged (k distinct indices from 1 to m in any order).
The final line should contain a permutation of integers from 1 to n, describing the way the strings should be reordered. The strings will be placed in the order indices placed in this permutation, the stolen string index will be ignored.
Output
For each test case print a single line with the stolen string.
Example
Input
3
3 5
aaaaa
bbbbb
ccccc
aaaaa
bbbbb
3 4
aaaa
bbbb
cccc
aabb
bbaa
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
xbcklf
eueueu
ayzdem
ukukuk
Output
ccccc
cccc
kekeke
Note
In the first test case, "aaaaa" and "bbbbb" exchanged all positions, and "ccccc" is the stolen string.
In the second test case, "aaaa" and "bbbb" exchanged two first positions, and "cccc" is the stolen string.
This is the first test in the hack format:
3
3 5
aaaaa
bbbbb
ccccc
1 2 5 1 2 3 4 5
2 1 3
3 4
aaaa
bbbb
cccc
1 2 2 1 2
2 1 3
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
1 5 3 2 3 6
2 4 3 2 4 6
5 4 1 2 3
Tags: interactive, math
Correct Solution:
```
import sys
from copy import deepcopy
input = sys.stdin.readline
for _ in range(int(input())):
n, m = map(int, input().split())
total = [0 for _ in range(m)]
for i in range(n):
tmp = list(input().rstrip())
for j in range(len(tmp)):
total[j] += ord(tmp[j])
for i in range(n - 1):
tmp = list(input().rstrip())
for j in range(len(tmp)):
total[j] -= ord(tmp[j])
for i in range(m):
print(chr(total[i]), end = '', flush=True)
print()
```
| 13,553
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
AquaMoon had n strings of length m each. n is an odd number.
When AquaMoon was gone, Cirno tried to pair these n strings together. After making (n-1)/(2) pairs, she found out that there was exactly one string without the pair!
In her rage, she disrupted each pair of strings. For each pair, she selected some positions (at least 1 and at most m) and swapped the letters in the two strings of this pair at the selected positions.
For example, if m = 6 and two strings "abcdef" and "xyzklm" are in one pair and Cirno selected positions 2, 3 and 6 she will swap 'b' with 'y', 'c' with 'z' and 'f' with 'm'. The resulting strings will be "ayzdem" and "xbcklf".
Cirno then stole away the string without pair and shuffled all remaining strings in arbitrary order.
AquaMoon found the remaining n-1 strings in complete disarray. Also, she remembers the initial n strings. She wants to know which string was stolen, but she is not good at programming. Can you help her?
Input
This problem is made as interactive. It means, that your solution will read the input, given by the interactor. But the interactor will give you the full input at the beginning and after that, you should print the answer. So you should solve the problem, like as you solve the usual, non-interactive problem because you won't have any interaction process. The only thing you should not forget is to flush the output buffer, after printing the answer. Otherwise, you can get an "Idleness limit exceeded" verdict. Refer to the [interactive problems guide](https://codeforces.com/blog/entry/45307) for the detailed information about flushing the output buffer.
The input consists of multiple test cases. The first line contains a single integer t (1 ≤ t ≤ 100) — the number of test cases.
The first line of each test case contains two integers n, m (1 ≤ n ≤ 10^5, 1 ≤ m ≤ 10^5) — the number of strings and the length of each string, respectively.
The next n lines each contain a string with length m, describing the original n strings. All string consists of lowercase Latin letters.
The next n-1 lines each contain a string with length m, describing the strings after Cirno exchanged and reordered them.
It is guaranteed that n is odd and that the sum of n ⋅ m over all test cases does not exceed 10^5.
Hack format:
The first line should contain a single integer t. After that t test cases should follow in the following format:
The first line should contain two integers n and m.
The following n lines should contain n strings of length m, describing the original strings.
The following (n-1)/(2) lines should describe the pairs. They should contain, in the following order: the index of the first string i (1 ≤ i ≤ n), the index of the second string j (1 ≤ j ≤ n, i ≠ j), the number of exchanged positions k (1 ≤ k ≤ m), and the list of k positions that are exchanged (k distinct indices from 1 to m in any order).
The final line should contain a permutation of integers from 1 to n, describing the way the strings should be reordered. The strings will be placed in the order indices placed in this permutation, the stolen string index will be ignored.
Output
For each test case print a single line with the stolen string.
Example
Input
3
3 5
aaaaa
bbbbb
ccccc
aaaaa
bbbbb
3 4
aaaa
bbbb
cccc
aabb
bbaa
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
xbcklf
eueueu
ayzdem
ukukuk
Output
ccccc
cccc
kekeke
Note
In the first test case, "aaaaa" and "bbbbb" exchanged all positions, and "ccccc" is the stolen string.
In the second test case, "aaaa" and "bbbb" exchanged two first positions, and "cccc" is the stolen string.
This is the first test in the hack format:
3
3 5
aaaaa
bbbbb
ccccc
1 2 5 1 2 3 4 5
2 1 3
3 4
aaaa
bbbb
cccc
1 2 2 1 2
2 1 3
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
1 5 3 2 3 6
2 4 3 2 4 6
5 4 1 2 3
Tags: interactive, math
Correct Solution:
```
#!/usr/bin/python3
# -*- coding: utf-8 -*-
'''
f = open('test.txt')
byt = f.readlines()
for x in byt:
print(x)
print(byt)
'''
t = int(input())
while t > 0:
t -= 1
s = input().split()
n = int(s[0])
m = int(s[1])
#建立每列的字典的列表
a = []
for i in range(n):
s = input()
if i == 0:
for x in s:
ai = dict()
ai[x] = 1
a.append(ai)
else:
for j in range(m):
ai = a[j]
if ai.get(s[j]) == None:
ai[s[j]] = 1
else:
ai[s[j]] += 1
a[j] = ai
#从每列的字典中删除出现过的
for i in range(n-1):
s = input()
for j in range(m):
ai = a[j]
if ai[s[j]] == 1:
del ai[s[j]]
else:
ai[s[j]] -= 1
#将每列剩余的一个拼接在一块儿
ans = ''
for j in range(m):
ai = a[j]
key = list(ai.keys())[0]
ans += key
print(ans)
```
| 13,554
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
AquaMoon had n strings of length m each. n is an odd number.
When AquaMoon was gone, Cirno tried to pair these n strings together. After making (n-1)/(2) pairs, she found out that there was exactly one string without the pair!
In her rage, she disrupted each pair of strings. For each pair, she selected some positions (at least 1 and at most m) and swapped the letters in the two strings of this pair at the selected positions.
For example, if m = 6 and two strings "abcdef" and "xyzklm" are in one pair and Cirno selected positions 2, 3 and 6 she will swap 'b' with 'y', 'c' with 'z' and 'f' with 'm'. The resulting strings will be "ayzdem" and "xbcklf".
Cirno then stole away the string without pair and shuffled all remaining strings in arbitrary order.
AquaMoon found the remaining n-1 strings in complete disarray. Also, she remembers the initial n strings. She wants to know which string was stolen, but she is not good at programming. Can you help her?
Input
This problem is made as interactive. It means, that your solution will read the input, given by the interactor. But the interactor will give you the full input at the beginning and after that, you should print the answer. So you should solve the problem, like as you solve the usual, non-interactive problem because you won't have any interaction process. The only thing you should not forget is to flush the output buffer, after printing the answer. Otherwise, you can get an "Idleness limit exceeded" verdict. Refer to the [interactive problems guide](https://codeforces.com/blog/entry/45307) for the detailed information about flushing the output buffer.
The input consists of multiple test cases. The first line contains a single integer t (1 ≤ t ≤ 100) — the number of test cases.
The first line of each test case contains two integers n, m (1 ≤ n ≤ 10^5, 1 ≤ m ≤ 10^5) — the number of strings and the length of each string, respectively.
The next n lines each contain a string with length m, describing the original n strings. All string consists of lowercase Latin letters.
The next n-1 lines each contain a string with length m, describing the strings after Cirno exchanged and reordered them.
It is guaranteed that n is odd and that the sum of n ⋅ m over all test cases does not exceed 10^5.
Hack format:
The first line should contain a single integer t. After that t test cases should follow in the following format:
The first line should contain two integers n and m.
The following n lines should contain n strings of length m, describing the original strings.
The following (n-1)/(2) lines should describe the pairs. They should contain, in the following order: the index of the first string i (1 ≤ i ≤ n), the index of the second string j (1 ≤ j ≤ n, i ≠ j), the number of exchanged positions k (1 ≤ k ≤ m), and the list of k positions that are exchanged (k distinct indices from 1 to m in any order).
The final line should contain a permutation of integers from 1 to n, describing the way the strings should be reordered. The strings will be placed in the order indices placed in this permutation, the stolen string index will be ignored.
Output
For each test case print a single line with the stolen string.
Example
Input
3
3 5
aaaaa
bbbbb
ccccc
aaaaa
bbbbb
3 4
aaaa
bbbb
cccc
aabb
bbaa
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
xbcklf
eueueu
ayzdem
ukukuk
Output
ccccc
cccc
kekeke
Note
In the first test case, "aaaaa" and "bbbbb" exchanged all positions, and "ccccc" is the stolen string.
In the second test case, "aaaa" and "bbbb" exchanged two first positions, and "cccc" is the stolen string.
This is the first test in the hack format:
3
3 5
aaaaa
bbbbb
ccccc
1 2 5 1 2 3 4 5
2 1 3
3 4
aaaa
bbbb
cccc
1 2 2 1 2
2 1 3
5 6
abcdef
uuuuuu
kekeke
ekekek
xyzklm
1 5 3 2 3 6
2 4 3 2 4 6
5 4 1 2 3
Tags: interactive, math
Correct Solution:
```
from collections import Counter
for _ in range(int(input())):
n, m = map(int, input().split())
f = [];l = []
f1={};l1={}
for i in range(n):
f += [input()]
for j in range(n - 1):
l += [input()]
for i in range(m):
s="";t=""
for j in range(n):
s+=f[j][i]
if j <len(l):
t+=l[j][i]
f1[i]=list(s)
l1[i]=list(t)
res=[]
for i in range(m):
w=list(f1[i])
t=list(l1[i])
res+= list((Counter(w) - Counter(t)).elements())
print("".join(res))
```
| 13,555
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
The DNA sequence for every living creature in Berland can be represented as a non-empty line consisting of lowercase Latin letters. Berland scientists found out that all the creatures evolve by stages. During one stage exactly one symbol of the DNA line is replaced by exactly two other ones. At that overall there are n permissible substitutions. The substitution ai->bici means that any one symbol ai can be replaced with two symbols bici. Every substitution could happen an unlimited number of times.
They say that two creatures with DNA sequences s1 and s2 can have a common ancestor if there exists such a DNA sequence s3 that throughout evolution it can result in s1 and s2, perhaps after a different number of stages. Your task is to find out by the given s1 and s2 whether the creatures possessing such DNA sequences can have a common ancestor. If the answer is positive, you have to find the length of the shortest sequence of the common ancestor’s DNA.
Input
The first line contains a non-empty DNA sequence s1, the second line contains a non-empty DNA sequence s2. The lengths of these lines do not exceed 50, the lines contain only lowercase Latin letters. The third line contains an integer n (0 ≤ n ≤ 50) — the number of permissible substitutions. Then follow n lines each of which describes a substitution in the format ai->bici. The characters ai, bi, and ci are lowercase Latin letters. Lines s1 and s2 can coincide, the list of substitutions can contain similar substitutions.
Output
If s1 and s2 cannot have a common ancestor, print -1. Otherwise print the length of the shortest sequence s3, from which s1 and s2 could have evolved.
Examples
Input
ababa
aba
2
c->ba
c->cc
Output
2
Input
ababa
aba
7
c->ba
c->cc
e->ab
z->ea
b->ba
d->dd
d->ab
Output
1
Input
ababa
aba
1
c->ba
Output
-1
Tags: dp
Correct Solution:
```
#!/usr/bin/env python3
import itertools
import collections
# Read input strings
s1 = input()
s2 = input()
# Read evolution rules, use a mapping from the 2 target characters to the source character
rules = collections.defaultdict(set)
n = int(input())
for i in range(n):
rule = input()
target = rule[-2:]
source = rule[0]
rules[target].add(source)
def substrings_of_precise_length(s, l):
# Generator for all substrings of s that are of length l
for start_pos in range(len(s)-l+1):
yield s[start_pos:start_pos+l]
def substrings_of_minimum_length(s, minlen):
# Generator for all substrings of s that are of length l or larger, in order from short to long length
return itertools.chain.from_iterable(substrings_of_precise_length(s,l) for l in range(minlen, len(s)+1))
def partitions_of_string(s):
# Generator for all possible pairs (a,b) such that a+b = c where a and b are not empty strings
for l1 in range(1, len(s)):
yield (s[:l1], s[l1:])
# Dictionary mapping strings onto the set of single characters from which those strings could evolve
ancestors = collections.defaultdict(set)
def update_ancestors(ancestors, rules, s):
# Update the ancestor dictionary for string s
# O(len(s)**3 * len(rules))
# All single characters can "evolve" from a single character
for c in s:
ancestors[c].add(c)
# Examine all substrings of s, in order of increasing length
for sub in substrings_of_minimum_length(s, 2):
# Examine any way the substring can be created from two seperate, smaller strings
for (sub1, sub2) in partitions_of_string(sub):
# Check all rules to see if the two substrings can evolve from a single character by using that rule
for target, sources in rules.items():
if (target[0] in ancestors[sub1]) and (target[1] in ancestors[sub2]):
ancestors[sub].update(sources)
# Update the ancestors based on s1 and s2
update_ancestors(ancestors, rules, s1)
update_ancestors(ancestors, rules, s2)
def prefixes(s):
# Generator for all non-empty prefixes of s, in order of increasing length
for l in range(1, len(s)+1):
yield s[:l]
def determine_shortest_common_ancestor(ancestors, s1, s2):
# Returns the length of the shortest common ancestor of string s1 and s2, or float('inf') if there is no common ancestor.
# The ancestors is a dictionary that contains for every substring of s1 and s2 the set of single characters from which that substring can evolve
# O(len(s1)**2 * len(s2)**2 * 26 )
# Dictionary mapping pairs of strings onto the length of their shortest common ancestor
shortest_common_ancestor = collections.defaultdict(lambda:float('inf'))
# Check every possible combinations of prefixes of s1 and s2
for (pre1,pre2) in itertools.product(prefixes(s1), prefixes(s2)):
# If both prefixes have an overlap in the single character from which they can evolve, then the shortest common ancestor is 1 letter
if not ancestors[pre1].isdisjoint(ancestors[pre2]):
shortest_common_ancestor[(pre1,pre2)] = 1
# Check all possible combinations of partitions of pre1 and pre2
temp = shortest_common_ancestor[(pre1, pre2)]
for ((sub1a,sub1b),(sub2a,sub2b)) in itertools.product(partitions_of_string(pre1), partitions_of_string(pre2)):
if not ancestors[sub1b].isdisjoint(ancestors[sub2b]):
# sub1b and sub2b can evolve from the same character, so the shortest common ancestor of sub1a+sub1b and sub2a+sub2b is
# never longer than the shortest common ancestor of sub1a and sub2a plus the one letter from which sub1b and sub2b can evolve
temp = min(temp, shortest_common_ancestor[(sub1a, sub2a)] + 1)
shortest_common_ancestor[(pre1, pre2)] = temp
return shortest_common_ancestor[(s1, s2)]
answer = determine_shortest_common_ancestor(ancestors, s1, s2)
if (answer == float('inf')):
print(-1)
else:
print(answer)
```
| 13,687
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Tags: implementation, strings
Correct Solution:
```
import re
al = re.compile(r'^1*23*$')
def getType(word):
if word.endswith("lios"): return 1
elif word.endswith("liala"): return -1
elif word.endswith("etr"): return 2
elif word.endswith("etra"): return -2
elif word.endswith("initis"):return 3
elif word.endswith("inites"): return -3
else: return 0
words = input().strip().split()
words = [getType(x) for x in words]
if len(words) == 1:
if words[0] != 0:print("YES")
else:print("NO")
else:
p = words[0]
for x in words:
if p*x <= 0:
print("NO")
exit()
words = [str(abs(x)) for x in words]
words = "".join(words)
if al.match(words):print("YES")
else:print("NO")
# Made By Mostafa_Khaled
```
| 14,198
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Tags: implementation, strings
Correct Solution:
```
def f(a):
b=len(a)
if b>=4 and a[-4:]=='lios':
return [1,1]
if b>=5 and a[-5:]=='liala':
return [1,2]
if b>=3 and a[-3:]=='etr':
return [2,1]
if b>=4 and a[-4:]=='etra':
return [2,2]
if b>=6 and a[-6:]=='initis':
return [3,1]
if b>=6 and a[-6:]=='inites':
return [3,2]
return -1
a=[f(i) for i in input().split()]
n=len(a)
if -1 in a or [i[1] for i in a]!=[a[0][1]]*n:
print('NO')
else:
i,j=0,n-1
while i<n and a[i][0]==1:
i+=1
while j>=0 and a[j][0]==3:
j-=1
print('YES' if i==j or n==1 else 'NO')
```
| 14,199
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Tags: implementation, strings
Correct Solution:
```
import re
t = input()
p = [r'([^ ]*lios )*([^ ]*etr)( [^ ]*initis)*',
r'([^ ]*liala )*([^ ]*etra)( [^ ]*inites)*',
r'[^ ]*(li(os|ala)|etra?|init[ie]s)']
print(['NO', 'YES'][any(re.fullmatch(q, t) for q in p)])
```
| 14,200
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Tags: implementation, strings
Correct Solution:
```
s, n, m, f = input().split(), False, False, False
def cc(w, me, fe):
global m, f
if w.endswith(me):
m = True
return True
elif w.endswith(fe):
f = True
return True
else:
return False
def ad(w): return cc(w, 'lios', 'liala')
def nn(w): return cc(w, 'etr', 'etra')
def vb(w): return cc(w, 'initis', 'inites')
for w in s:
if not n:
if ad(w) or vb(w) and len(s) == 1:
pass
elif nn(w):
n = True
else:
print('NO')
exit()
elif not vb(w):
print('NO')
exit()
print('YES' if len(s) == 1 or (n and (m ^ f)) else 'NO')
```
| 14,201
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Tags: implementation, strings
Correct Solution:
```
# from dust i have come dust i will be
#each should be of same gender
#adjective*-noun*1-verb*
a=list(map(str,input().split()))
t=[0]*len(a)
str=["lios","liala","etr","etra","initis","inites"]
if len(a)==1:
for i in range(6):
if a[0].endswith(str[i]):
print("YES")
exit(0)
print("NO")
exit(0)
for i in range(len(a)):
for j in range(6):
if a[i].endswith(str[j]):
t[i]=j+1
break
#not belonging in any language
if t[i]==0:
print("NO")
exit(0)
#all the t[]'s should be either or odd
rem=t[0]%2
for i in range(len(t)):
if t[i]%2!=rem:
print("NO")
exit(0)
x=sorted(t)
cnt=0
for i in range(len(t)):
if t[i]==3 or t[i]==4:
cnt+=1
if t[i]!=x[i]:
print("NO")
exit(0)
if cnt==1:
print("YES")
else:
print("NO")
```
| 14,202
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Tags: implementation, strings
Correct Solution:
```
madj = "lios"
fadj = "liala"
mnoun = "etr"
fnoun = "etra"
mver = "initis"
fver = "inites"
def valid_word(word):
sz = len(word)
if word[sz-len(mver):] == mver:
return (0, "v")
if word[sz-len(mver):] == fver:
return (1, "v")
if word[sz-len(fadj):] == fadj:
return (1, "a")
if word[sz-len(madj):] == madj:
return (0, "a")
if word[sz-len(fnoun):] == fnoun:
return (1, "n")
if word[sz-len(mnoun):] == mnoun:
return (0, "n")
return False
def valid_sentence(l):
if len(l) == 1:
if valid_word(l[0]):
return True
else:
return False
tupla = valid_word(l[0])
if tupla:
genero, tipo = tupla
else:
return False
flag = False
for i in range(0, len(l)):
tupla = valid_word(l[i])
if tupla:
g, t = tupla
else:
return False
if g != genero:
return False
if t == "a":
if flag == True:
return False
if t == "n":
if flag == True:
return False
flag = True
if t == "v":
if flag == False:
return False
return flag
l = input().split(' ')
if valid_sentence(l):
print("YES")
else:
print("NO")
```
| 14,203
|
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Tags: implementation, strings
Correct Solution:
```
def method(a,key):
key_len = [ len(i) for i in key ]
data = []
for i in a:
temp = None
x,y,z = i[-key_len[0]::],i[-key_len[1]::],i[-key_len[2]::]
if x in key:
temp = key.index(x)
elif y in key:
temp = key.index(y)
elif z in key:
temp = key.index(z)
if temp==None:
return []
else:
data.append(temp)
return data
def language(a):
m =['lios','etr','initis']
f =['liala','etra','inites']
a = a.split()
data_m = method(a,m)
data_f = method(a,f)
data = data_m if len(data_m)>len(data_f) else data_f
try:
assert len(a)==len(data)
if len(data)==1:
pass
else:
assert data.count(1)==1
for i in range(len(data)-1):
assert data[i]<=data[i+1]
return "YES"
except:
return "NO"
a = input()
print(language(a))
```
| 14,204
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Tags: implementation, strings
Correct Solution:
```
import sys
def solve():
validendings = ["lios", "liala", "etr", "etra", "initis", "inites"]
s = input().split()
if len(s) == 1:
if endswith(s[0], validendings):
print("YES")
return
print("NO")
return
nounends = ["etr", "etra"]
nouns = list()
for i, word in enumerate(s):
if endswith(word, nounends):
nouns.append(i)
if len(nouns) != 1:
print("NO")
return
nounindex, noun = nouns[0], s[nouns[0]]
malenoun = True if endswith(noun, ["etr"]) else False
adjectives = list()
verbs = list()
for i in range(nounindex):
word = s[i]
shouldendwith = "lios" if malenoun else "liala"
if endswith(word, [shouldendwith]):
adjectives.append(i)
for i in range(nounindex + 1, len(s)):
word = s[i]
shouldendwith = "initis" if malenoun else "inites"
if endswith(word, [shouldendwith]):
verbs.append(i)
if 1 + len(adjectives) + len(verbs) == len(s):
print("YES")
return
print("NO")
def endswith(word, validendings):
for ending in validendings:
if len(word) >= len(ending):
if word[-len(ending) : ] == ending:
return True
return False
def rv(): return map(int, input().split())
def rl(n): return [list(map(int, input().split())) for _ in range(n)]
if sys.hexversion == 50594544 : sys.stdin = open("test.txt")
solve()
```
| 14,205
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Submitted Solution:
```
def ch_gen(word):
for x in gen:
for w in range(3):
try:
if word[-len(gen[x][w]):] == gen[x][w]: return (x,str(w))
except IndexError: continue
return (-1,-1)
gen = {0:['lios','etr','initis'],1:['liala','etra','inites']}
s = input().split()
if len(s) == 1: print("YES" if ch_gen(s[0])[0] != -1 else "NO")
else:
gender = ch_gen(s[0]); arr = [0]*len(s);
arr[0] = gender[1]; flag = True
for t in range(1,len(s)):
nxt = ch_gen(s[t]); arr[t] = nxt[1]
if nxt[0]!=gender[0] or gender[0] == -1: print('NO'); exit()
act = "".join(arr);
tur,fur,cur,sir,nut= act.count('1'),act.count('02'),act.count('20'),act.count('21'),act.count('10')
if tur == 0 or tur > 1 or fur or cur or sir or nut: flag = False
print("YES" if flag else "NO")
```
Yes
| 14,206
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Submitted Solution:
```
s = input()
l_adj = ['lios', 'liala']
l_noun = ['etr', 'etra']
l_verb = ['initis', 'inites']
word = []
temp_index = 0
for i in range(len(s)):
if s[i]==" ":
word.append(s[temp_index:i])
temp_index = i+1
elif i == len(s)-1:
word.append(s[temp_index:i+1])
index_adj_mas = []
index_noun_mas= []
index_verb_mas = []
index_adj_fem = []
index_noun_fem = []
index_verb_fem = []
mas = []
fem = []
for i in range(len(word)):
if word[i].endswith(l_noun[0]):
mas.append(word[i])
index_noun_mas.append(i)
elif word[i].endswith(l_adj[0]):
mas.append(word[i])
index_adj_mas.append(i)
elif word[i].endswith(l_verb[0]):
mas.append(word[i])
index_verb_mas.append(i)
elif word[i].endswith(l_noun[1]):
fem.append(word[i])
index_noun_fem.append(i)
elif word[i].endswith(l_adj[1]):
fem.append(word[i])
index_adj_fem.append(i)
elif word[i].endswith(l_verb[1]):
fem.append(word[i])
index_verb_fem.append(i)
'''
print(mas , fem)
print(len(mas),len(fem),len(word))
print(index_adj_mas,
index_noun_mas,
index_verb_mas,
index_adj_fem,
index_noun_fem,
index_verb_fem)
'''
def f(word):
flag = 0
if len(word)==1:
if len(index_adj_mas)+len(index_noun_mas)+len(index_verb_mas)+len(index_adj_fem)+len(index_noun_fem)+len(index_verb_fem) == 0:
flag = 1
else:
flag = 0
else:
if (len(mas)==len(word) or len(fem)==len(word)) and (len(index_noun_fem)==1 or len(index_noun_mas)==1):
#print("Yes")
if len(fem)==len(word):
if len(index_adj_fem)>0:
for i in range(len(index_adj_fem)):
if index_noun_fem[0] <= index_adj_fem[i]:
flag = 1 #false/no
#print("1")
break
if len(index_verb_fem)>0:
for i in range(len(index_verb_fem)):
if index_noun_fem[0] >= index_verb_fem[i]:
flag = 1 #false/no
#print("2")
break
elif len(mas)==len(word):
if len(index_adj_mas)>0:
for i in range(len(index_adj_mas)):
if index_noun_mas[0] <= index_adj_mas[i]:
flag = 1 #false/no
#print("3")
break
if len(index_verb_mas)>0:
for i in range(len(index_verb_mas)):
if index_noun_mas[0] >= index_verb_mas[i]:
flag = 1 #false/no
#print("4")
break
elif (len(mas)!= len(word) or len(fem)!=len(word)):
flag = 1
#print("5")
elif len(index_noun_fem)!=1 or len(index_noun_mas)!=1:
flag = 1
return flag
#print(word)
result = f(word)
if result==0:
print("YES")
else:
print("NO")
```
Yes
| 14,207
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Submitted Solution:
```
import re
al = re.compile(r'^1*23*$')
def getType(word):
if word.endswith("lios"): return 1
elif word.endswith("liala"): return -1
elif word.endswith("etr"): return 2
elif word.endswith("etra"): return -2
elif word.endswith("initis"):return 3
elif word.endswith("inites"): return -3
else: return 0
words = input().strip().split()
words = [getType(x) for x in words]
if len(words) == 1:
if words[0] != 0:print("YES")
else:print("NO")
else:
p = words[0]
for x in words:
if p*x <= 0:
print("NO")
exit()
words = [str(abs(x)) for x in words]
words = "".join(words)
if al.match(words):print("YES")
else:print("NO")
```
Yes
| 14,208
|
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|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Submitted Solution:
```
lista = input().split()
passadj = False
passsub = False
gender = -1
can = True
canF = True
# verificando os generos das palavras
for i in range(0,len(lista)):
if (len(lista[i]) >= 3 and lista[i][len(lista[i])-3::] == "etr") or (len(lista[i]) >= 4 and lista[i][len(lista[i])-4::] == "lios") or (len(lista[i]) >= 6 and lista[i][len(lista[i])-6::] == "initis"):
if gender == -1:
gender = 1
elif gender == 2:
can = False
else:
if gender == -1:
gender = 2
elif gender == 1:
can = False
# print(can)
# verificando os blocos
for i in range(0, len(lista)):
if (len(lista[i]) >= 4 and lista[i][len(lista[i])-4::] == "lios") or (len(lista[i]) >= 5 and lista[i][len(lista[i])-5::] == "liala"):
if(passadj == True):
can = False
elif (len(lista[i]) >= 3 and lista[i][len(lista[i])-3::] == "etr") or (len(lista[i]) >= 4 and lista[i][len(lista[i])-4::] == "etra"):
passadj = True
if passsub == True:
can = False
else:
passsub = True
elif (len(lista[i]) >= 6 and lista[i][len(lista[i])-6::] == "initis") or (len(lista[i]) >= 6 and lista[i][len(lista[i])-6::] == "inites"):
if passadj == False or passsub == False:
can = False
else:
canF = False
# print(can)
if (len(lista)==1 and canF) or (passsub and canF and can):
print("YES\n")
else:
print("NO\n")
```
Yes
| 14,209
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Submitted Solution:
```
def f(a):
b=len(a)
if b>=4 and a[-4:]=='lios':
return [1,1]
if b>=5 and a[-5:]=='liala':
return [1,2]
if b>=3 and a[-3:]=='etr':
return [2,1]
if b>=4 and a[-4:]=='etra':
return [2,2]
if b>=6 and a[-6:]=='initis':
return [3,1]
if b>=6 and a[-6:]=='inites':
return [3,2]
return -1
a=[f(i) for i in input().split()]
n=len(a)
if -1 in a or [i[1] for i in a]!=[a[0][1]]*n:
print('NO')
else:
i,j=0,n-1
while i<n and a[i][0]==1:
i+=1
while j>=0 and a[j][0]==3:
j-=1
print('YES' if i==j else 'NO')
```
No
| 14,210
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Submitted Solution:
```
ans=list(map(str,input().split()))
def tix(s):
t=s
gender=-1
typ=-1
if(len(t)>=4 and t[len(s)-4:]=='lios'):
gender=1
typ=1
if(len(t)>=5 and t[len(s)-5:]=='liala'):
gender=0
typ=1
if(len(t)>=3 and t[len(s)-3:]=='etr'):
gender=1
typ=2
if(len(t)>=4 and t[len(s)-4:]=='etra'):
gender=0
typ=2
if(len(t)>=6 and t[len(s)-6:]=='initis'):
gender=1
typ=3
if(len(t)>=6 and t[len(s)-6:]=='inites'):
gender=0
typ=3
return [gender,typ]
gag=[]
sip=[]
if(len(ans)==1):
if(tix(ans[0])[0]!=-1):
print('YES')
else:
print('NO')
exit()
for i in range(len(ans)):
m=tix(ans[i])
if(m[0]==-1):
print('NO')
exit()
gag.append(m[0])
sip.append(m[1])
if(sip.count(2)!=1):
print('NO')
exit()
if(gag.count(gag[0])!=len(gag)):
print('NO')
exit()
al=[]
count=1
for i in range(1,len(sip)):
if(sip[i]==sip[i-1]):
count+=1
else:
al.append(count)
count=1
al.append(count)
if(len(al)>3):
print('NO')
exit()
if(len(al)==1):
print('YES')
exit()
elif(len(al)==2):
if(sip[0]==3):
print('NO')
exit()
else:
print('YES')
exit()
else:
if(sip[0]==1 and sip[-1]==3):
print('YES')
else:
print('NO')
exit()
```
No
| 14,211
|
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Submitted Solution:
```
words = [c for c in input().split()]
verdict = True
category = ["" for i in range(len(words))]
for i in range(len(words)):
if (not verdict): break
if (len(words[i]) < 3): verdict = False
elif (words[i][-3:] == "etr" or (len(words[i]) >= 4 and words[i][-4:] == "etra")): category[i] = "noun"
elif ((len(words[i]) >= 4 and words[i][-4:] == "lios") or (len(words[i]) >= 5 and words[i][-5:] == "liala")): category[i] = "adjective"
elif (len(words[i]) >= 6 and (words[i][-6:] == "initis" or words[i][-6:] == "inites")): category[i] = "verb"
else: verdict = False
first_noun = -1
for i in range(len(category)):
if (category[i] == "noun"):
first_noun = i
break
if (first_noun == -1 and len(words) > 1): verdict = False
elif (first_noun != -1):
left, right = first_noun - 1, first_noun + 1
while (left >= 0 and category[left] != "noun"): left -= 1
while (right < len(category) and category[right] != "noun"): right += 1
if (left >= 0 or right < len(category)): verdict = False
print(("NO" if (not verdict) else "YES"))
```
No
| 14,212
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] | 6
|
Evaluate the correctness of the submitted Python 3 solution to the coding contest problem. Provide a "Yes" or "No" response.
Petya got interested in grammar on his third year in school. He invented his own language called Petya's. Petya wanted to create a maximally simple language that would be enough to chat with friends, that's why all the language's grammar can be described with the following set of rules:
* There are three parts of speech: the adjective, the noun, the verb. Each word in his language is an adjective, noun or verb.
* There are two genders: masculine and feminine. Each word in his language has gender either masculine or feminine.
* Masculine adjectives end with -lios, and feminine adjectives end with -liala.
* Masculine nouns end with -etr, and feminime nouns end with -etra.
* Masculine verbs end with -initis, and feminime verbs end with -inites.
* Thus, each word in the Petya's language has one of the six endings, given above. There are no other endings in Petya's language.
* It is accepted that the whole word consists of an ending. That is, words "lios", "liala", "etr" and so on belong to the Petya's language.
* There aren't any punctuation marks, grammatical tenses, singular/plural forms or other language complications.
* A sentence is either exactly one valid language word or exactly one statement.
Statement is any sequence of the Petya's language, that satisfy both conditions:
* Words in statement follow in the following order (from the left to the right): zero or more adjectives followed by exactly one noun followed by zero or more verbs.
* All words in the statement should have the same gender.
After Petya's friend Vasya wrote instant messenger (an instant messaging program) that supported the Petya's language, Petya wanted to add spelling and grammar checking to the program. As Vasya was in the country and Petya didn't feel like waiting, he asked you to help him with this problem. Your task is to define by a given sequence of words, whether it is true that the given text represents exactly one sentence in Petya's language.
Input
The first line contains one or more words consisting of lowercase Latin letters. The overall number of characters (including letters and spaces) does not exceed 105.
It is guaranteed that any two consecutive words are separated by exactly one space and the input data do not contain any other spaces. It is possible that given words do not belong to the Petya's language.
Output
If some word of the given text does not belong to the Petya's language or if the text contains more that one sentence, print "NO" (without the quotes). Otherwise, print "YES" (without the quotes).
Examples
Input
petr
Output
YES
Input
etis atis animatis etis atis amatis
Output
NO
Input
nataliala kataliala vetra feinites
Output
YES
Submitted Solution:
```
s = input()
l_adj = ['lios', 'liala']
l_noun = ['etr', 'etra']
l_verb = ['initis', 'inites']
index_adj_mas = []
index_noun_mas= []
index_verb_mas = []
index_adj_fem = []
index_noun_fem = []
index_verb_fem = []
mas = []
fem = []
word = []
temp_index = 0
for i in range(len(s)):
if s[i]==" ":
word.append(s[temp_index:i])
temp_index = i+1
elif i == len(s)-1:
word.append(s[temp_index:i+1])
#print(word)
for i in range(len(word)):
if word[i].endswith(l_noun[0]):
mas.append(word[i])
index_noun_mas.append(i)
elif word[i].endswith(l_adj[0]):
mas.append(word[i])
index_adj_mas.append(i)
elif word[i].endswith(l_verb[0]):
mas.append(word[i])
index_verb_mas.append(i)
elif word[i].endswith(l_noun[1]):
fem.append(word[i])
index_noun_fem.append(i)
elif word[i].endswith(l_adj[1]):
fem.append(word[i])
index_adj_fem.append(i)
elif word[i].endswith(l_verb[1]):
fem.append(word[i])
index_verb_fem.append(i)
#print(mas , fem)
'''
print(index_adj_mas,
index_noun_mas,
index_verb_mas,
index_adj_fem,
index_noun_fem,
index_verb_fem)
'''
flag = 0
if (len(mas)==len(s) or len(fem)==len(s)) and (len(index_noun_fem)==1 or len(index_noun_mas)==1):
#print("Yes")
if len(fem)==len(s):
for i in range(len(index_adj_fem)):
if index_noun_fem[0] <= index_adj_fem[i]:
flag = 1 #false/no
break
for i in range(len(index_verb_fem)):
if index_noun_fem[0] >= index_verb_fem[i]:
flag = 1 #false/no
break
elif len(mas)==len(s):
for i in range(len(index_adj_mas)):
if index_noun_mas[0] <= index_adj_mas[i]:
flag = 1 #false/no
break
for i in range(len(index_verb_mas)):
if index_noun_mas[0] >= index_verb_mas[i]:
flag = 1 #false/no
break
elif (len(mas)!=len(s) or len(fem)!=len(s)) and (len(index_noun_fem)!=1 or len(index_noun_mas)!=1):
flag = 1
if flag==0:
print("YES")
else:
print("NO")
```
No
| 14,213
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
In this problem you will write a simple code generator for a 2D programming language derived from [Brainfuck](https://en.wikipedia.org/wiki/Brainfuck).
The code in this language is a rectangular grid of characters '.' and 'X'. The code is converted to a Brainfuck program as follows: the characters are read in the usual order (top to bottom, left to right), and each 'X' character is converted a Brainfuck instruction to be executed. The instruction is defined by the left, top and right neighbors of the 'X' character using the following conversion table:
<image>
You are given a string. Output a program in the described language which prints this string.
You can download the language interpreter used for judging here: <https://assets.codeforces.com/rounds/952/puzzling-interpreter.cpp> (use C++11 to compile the code). Note several implementation details:
* The first step of the language interpretation is conversion to a Brainfuck program, which is then executed.
* The code must be rectangular, with all lines of the same length. It can have at most 10,000 lines and 10,000 columns, and can have at most 500,000 'X' characters.
* The code has toroidal topology, i.e. the 'X' on the first line will have top neighbor in the last line.
* Brainfuck interpreter has 30000 memory cells which store integers from 0 to 255 with increment/decrement done modulo 256.
* Console input (, command) is allowed in Brainfuck code but has no effect when executed.
Input
The input consists of a single string of characters with ASCII codes between 33 ('!') and 122 ('z'), inclusive. The length of the string is between 1 and 10 characters, inclusive.
Output
Output a program in the described language which, when executed, will print the given message.
Example
Input
$$$
Output
.......X.......
......XXX......
.....XXXXX.....
....XXXXXXX....
...XXXXXXXXX...
..XXXXXXXXXXX..
.XXXXXXXXXXXXX.
...............
X.............X
X..............
X..............
X..............
Note
The example corresponds to the following Brainfuck program:
-
>+<
>+++<
>+++++<
>+++++++<
>+++++++++<
>+++++++++++<
< >
.
.
.
The triangular block decrements the first memory cell and sets the value of the second memory cell to 36 - the ASCII code of '$' character. The next line after the triangular block moves the memory pointer to the second memory cell, and the next three lines print the '$' character three times.
Tags: constructive algorithms
Correct Solution:
```
# A +
# print(int(input()) % 2)
# B
# good = ['cool', 'great', 'not bad', '!']
# for i in range(10):
# print(i, flush=True)
# r = input().strip().lower()
# for g in good:
# if g in r:
# print('normal', flush=True)
# exit(0)
# print('grumpy', flush=True)
# C +
# input()
# a = [int(x) for x in input().split()]
# while a:
# for i in range(len(a)-1):
# if abs(a[i] - a[i+1]) >= 2:
# print('NO')
# exit(0)
# a.pop(a.index(max(a)))
# print('YES')
# D
# print(20)
# E +
# n = int(input())
# a, b = 0, 0
# for _ in range(n):
# _, s = input().split()
# if s == 'soft':
# a += 1
# else:
# b += 1
# if a < b:
# a, b = b, a
# x = 0
# for i in range(1, 200):
# x += 1 + (i*2 - 1) // 4 * 2
# if a <= x and b <= i**2 - x:
# print(i)
# break
# G
s = [ord(x) for x in input().strip()]
pv = 0
at = 0
wid = 600
for x in s:
dt = (x - pv) % 256
dt = -dt % 256
if dt == 0:
dt = 256
print('X.'*dt + '.'*(wid - dt*2))
print('X' + '.'*(wid - 1))
print('.'*wid)
pv = x
```
| 14,740
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] | 6
|
Provide tags and a correct Python 3 solution for this coding contest problem.
In this problem you will write a simple code generator for a 2D programming language derived from [Brainfuck](https://en.wikipedia.org/wiki/Brainfuck).
The code in this language is a rectangular grid of characters '.' and 'X'. The code is converted to a Brainfuck program as follows: the characters are read in the usual order (top to bottom, left to right), and each 'X' character is converted a Brainfuck instruction to be executed. The instruction is defined by the left, top and right neighbors of the 'X' character using the following conversion table:
<image>
You are given a string. Output a program in the described language which prints this string.
You can download the language interpreter used for judging here: <https://assets.codeforces.com/rounds/952/puzzling-interpreter.cpp> (use C++11 to compile the code). Note several implementation details:
* The first step of the language interpretation is conversion to a Brainfuck program, which is then executed.
* The code must be rectangular, with all lines of the same length. It can have at most 10,000 lines and 10,000 columns, and can have at most 500,000 'X' characters.
* The code has toroidal topology, i.e. the 'X' on the first line will have top neighbor in the last line.
* Brainfuck interpreter has 30000 memory cells which store integers from 0 to 255 with increment/decrement done modulo 256.
* Console input (, command) is allowed in Brainfuck code but has no effect when executed.
Input
The input consists of a single string of characters with ASCII codes between 33 ('!') and 122 ('z'), inclusive. The length of the string is between 1 and 10 characters, inclusive.
Output
Output a program in the described language which, when executed, will print the given message.
Example
Input
$$$
Output
.......X.......
......XXX......
.....XXXXX.....
....XXXXXXX....
...XXXXXXXXX...
..XXXXXXXXXXX..
.XXXXXXXXXXXXX.
...............
X.............X
X..............
X..............
X..............
Note
The example corresponds to the following Brainfuck program:
-
>+<
>+++<
>+++++<
>+++++++<
>+++++++++<
>+++++++++++<
< >
.
.
.
The triangular block decrements the first memory cell and sets the value of the second memory cell to 36 - the ASCII code of '$' character. The next line after the triangular block moves the memory pointer to the second memory cell, and the next three lines print the '$' character three times.
Tags: constructive algorithms
Correct Solution:
```
import sys
s = input()
#f = open('out.txt', 'w')
f = sys.stdout
n = 0
d = '\x00'
for c in s:
n = ord(c) - ord(d)
#print(n, file=sys.stderr)
if (n < 0):
for i in range(-n):
if i % 2 == 0:
print('X....', file=f)
else:
print('.X...', file=f)
elif n > 0:
for i in range(n):
print('..X..', file=f)
print('.XXX.', file=f)
print('XXXXX', file=f)
print('.....', file=f)
print('X....', file=f)
print('.....', file=f)
print('X...X', file=f)
print('X....', file=f)
print('.....', file=f)
d = c
f.close()
```
| 14,741
|
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
In this problem you will write a simple code generator for a 2D programming language derived from [Brainfuck](https://en.wikipedia.org/wiki/Brainfuck).
The code in this language is a rectangular grid of characters '.' and 'X'. The code is converted to a Brainfuck program as follows: the characters are read in the usual order (top to bottom, left to right), and each 'X' character is converted a Brainfuck instruction to be executed. The instruction is defined by the left, top and right neighbors of the 'X' character using the following conversion table:
<image>
You are given a string. Output a program in the described language which prints this string.
You can download the language interpreter used for judging here: <https://assets.codeforces.com/rounds/952/puzzling-interpreter.cpp> (use C++11 to compile the code). Note several implementation details:
* The first step of the language interpretation is conversion to a Brainfuck program, which is then executed.
* The code must be rectangular, with all lines of the same length. It can have at most 10,000 lines and 10,000 columns, and can have at most 500,000 'X' characters.
* The code has toroidal topology, i.e. the 'X' on the first line will have top neighbor in the last line.
* Brainfuck interpreter has 30000 memory cells which store integers from 0 to 255 with increment/decrement done modulo 256.
* Console input (, command) is allowed in Brainfuck code but has no effect when executed.
Input
The input consists of a single string of characters with ASCII codes between 33 ('!') and 122 ('z'), inclusive. The length of the string is between 1 and 10 characters, inclusive.
Output
Output a program in the described language which, when executed, will print the given message.
Example
Input
$$$
Output
.......X.......
......XXX......
.....XXXXX.....
....XXXXXXX....
...XXXXXXXXX...
..XXXXXXXXXXX..
.XXXXXXXXXXXXX.
...............
X.............X
X..............
X..............
X..............
Note
The example corresponds to the following Brainfuck program:
-
>+<
>+++<
>+++++<
>+++++++<
>+++++++++<
>+++++++++++<
< >
.
.
.
The triangular block decrements the first memory cell and sets the value of the second memory cell to 36 - the ASCII code of '$' character. The next line after the triangular block moves the memory pointer to the second memory cell, and the next three lines print the '$' character three times.
Tags: constructive algorithms
Correct Solution:
```
s = [ord(x) for x in input()]
val = 0
add2 = '...\n.XX\nXXX'
sub1 = '...\n.X.'
for ch in s:
delta = ch - val + 1
if delta > 0:
if delta % 3 == 1:
print(add2)
print(sub1)
delta -= 1
elif delta % 3 == 2:
print(add2)
delta -= 2
if delta >= 3:
tmp = '...' + '\nXXX' * (delta // 3 + 1)
print(tmp)
elif delta < 0:
tmp = '...' + ('\n' + sub1) * -delta
print(tmp)
print('...')
print('.X.')
print('.X.')
print('...')
val = ch
```
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
In this problem you will write a simple code generator for a 2D programming language derived from [Brainfuck](https://en.wikipedia.org/wiki/Brainfuck).
The code in this language is a rectangular grid of characters '.' and 'X'. The code is converted to a Brainfuck program as follows: the characters are read in the usual order (top to bottom, left to right), and each 'X' character is converted a Brainfuck instruction to be executed. The instruction is defined by the left, top and right neighbors of the 'X' character using the following conversion table:
<image>
You are given a string. Output a program in the described language which prints this string.
You can download the language interpreter used for judging here: <https://assets.codeforces.com/rounds/952/puzzling-interpreter.cpp> (use C++11 to compile the code). Note several implementation details:
* The first step of the language interpretation is conversion to a Brainfuck program, which is then executed.
* The code must be rectangular, with all lines of the same length. It can have at most 10,000 lines and 10,000 columns, and can have at most 500,000 'X' characters.
* The code has toroidal topology, i.e. the 'X' on the first line will have top neighbor in the last line.
* Brainfuck interpreter has 30000 memory cells which store integers from 0 to 255 with increment/decrement done modulo 256.
* Console input (, command) is allowed in Brainfuck code but has no effect when executed.
Input
The input consists of a single string of characters with ASCII codes between 33 ('!') and 122 ('z'), inclusive. The length of the string is between 1 and 10 characters, inclusive.
Output
Output a program in the described language which, when executed, will print the given message.
Example
Input
$$$
Output
.......X.......
......XXX......
.....XXXXX.....
....XXXXXXX....
...XXXXXXXXX...
..XXXXXXXXXXX..
.XXXXXXXXXXXXX.
...............
X.............X
X..............
X..............
X..............
Note
The example corresponds to the following Brainfuck program:
-
>+<
>+++<
>+++++<
>+++++++<
>+++++++++<
>+++++++++++<
< >
.
.
.
The triangular block decrements the first memory cell and sets the value of the second memory cell to 36 - the ASCII code of '$' character. The next line after the triangular block moves the memory pointer to the second memory cell, and the next three lines print the '$' character three times.
Tags: constructive algorithms
Correct Solution:
```
print(*['\n'.join([*['...\n.X.' for i in range(256 - x)], '.X.', *['...\n.X.' for i in range(x)]]) for x in map(ord, input())], sep='\n')
```
| 14,743
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
In this problem you will write a simple code generator for a 2D programming language derived from [Brainfuck](https://en.wikipedia.org/wiki/Brainfuck).
The code in this language is a rectangular grid of characters '.' and 'X'. The code is converted to a Brainfuck program as follows: the characters are read in the usual order (top to bottom, left to right), and each 'X' character is converted a Brainfuck instruction to be executed. The instruction is defined by the left, top and right neighbors of the 'X' character using the following conversion table:
<image>
You are given a string. Output a program in the described language which prints this string.
You can download the language interpreter used for judging here: <https://assets.codeforces.com/rounds/952/puzzling-interpreter.cpp> (use C++11 to compile the code). Note several implementation details:
* The first step of the language interpretation is conversion to a Brainfuck program, which is then executed.
* The code must be rectangular, with all lines of the same length. It can have at most 10,000 lines and 10,000 columns, and can have at most 500,000 'X' characters.
* The code has toroidal topology, i.e. the 'X' on the first line will have top neighbor in the last line.
* Brainfuck interpreter has 30000 memory cells which store integers from 0 to 255 with increment/decrement done modulo 256.
* Console input (, command) is allowed in Brainfuck code but has no effect when executed.
Input
The input consists of a single string of characters with ASCII codes between 33 ('!') and 122 ('z'), inclusive. The length of the string is between 1 and 10 characters, inclusive.
Output
Output a program in the described language which, when executed, will print the given message.
Example
Input
$$$
Output
.......X.......
......XXX......
.....XXXXX.....
....XXXXXXX....
...XXXXXXXXX...
..XXXXXXXXXXX..
.XXXXXXXXXXXXX.
...............
X.............X
X..............
X..............
X..............
Note
The example corresponds to the following Brainfuck program:
-
>+<
>+++<
>+++++<
>+++++++<
>+++++++++<
>+++++++++++<
< >
.
.
.
The triangular block decrements the first memory cell and sets the value of the second memory cell to 36 - the ASCII code of '$' character. The next line after the triangular block moves the memory pointer to the second memory cell, and the next three lines print the '$' character three times.
Tags: constructive algorithms
Correct Solution:
```
# python3
import math
WIDTH = 170
def add(n):
if n == 1:
add(2)
add(255)
else:
while n:
k = min(n, WIDTH - 1)
n -= k
print('.' * WIDTH)
print('X' * (k - 1) + '.' * (WIDTH - k) + 'X')
print('X' * WIDTH)
def print_mem2():
print('.' * WIDTH)
print('X' + '.' * (WIDTH - 2) + 'X')
print('X' + '.' * (WIDTH - 1))
# main
mem2 = 0
for symbol in map(ord, input()):
add((symbol - mem2) % 256)
print_mem2()
mem2 = symbol
```
| 14,744
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|
Provide tags and a correct Python 3 solution for this coding contest problem.
In this problem you will write a simple code generator for a 2D programming language derived from [Brainfuck](https://en.wikipedia.org/wiki/Brainfuck).
The code in this language is a rectangular grid of characters '.' and 'X'. The code is converted to a Brainfuck program as follows: the characters are read in the usual order (top to bottom, left to right), and each 'X' character is converted a Brainfuck instruction to be executed. The instruction is defined by the left, top and right neighbors of the 'X' character using the following conversion table:
<image>
You are given a string. Output a program in the described language which prints this string.
You can download the language interpreter used for judging here: <https://assets.codeforces.com/rounds/952/puzzling-interpreter.cpp> (use C++11 to compile the code). Note several implementation details:
* The first step of the language interpretation is conversion to a Brainfuck program, which is then executed.
* The code must be rectangular, with all lines of the same length. It can have at most 10,000 lines and 10,000 columns, and can have at most 500,000 'X' characters.
* The code has toroidal topology, i.e. the 'X' on the first line will have top neighbor in the last line.
* Brainfuck interpreter has 30000 memory cells which store integers from 0 to 255 with increment/decrement done modulo 256.
* Console input (, command) is allowed in Brainfuck code but has no effect when executed.
Input
The input consists of a single string of characters with ASCII codes between 33 ('!') and 122 ('z'), inclusive. The length of the string is between 1 and 10 characters, inclusive.
Output
Output a program in the described language which, when executed, will print the given message.
Example
Input
$$$
Output
.......X.......
......XXX......
.....XXXXX.....
....XXXXXXX....
...XXXXXXXXX...
..XXXXXXXXXXX..
.XXXXXXXXXXXXX.
...............
X.............X
X..............
X..............
X..............
Note
The example corresponds to the following Brainfuck program:
-
>+<
>+++<
>+++++<
>+++++++<
>+++++++++<
>+++++++++++<
< >
.
.
.
The triangular block decrements the first memory cell and sets the value of the second memory cell to 36 - the ASCII code of '$' character. The next line after the triangular block moves the memory pointer to the second memory cell, and the next three lines print the '$' character three times.
Tags: constructive algorithms
Correct Solution:
```
s = input()
for c in s:
for i in range(256 - ord(c)):
print("...\n.X.")
print(".X.")
for i in range(ord(c)):
print("...\n.X.")
```
| 14,745
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|
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