Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3
import sys
import collections

def solve(N: int, s: "List[str]"):
    answer = 0
    ss = [collections.Counter(s[i]) for i in range(N)]

    for i in range(N):
        a = 1
        pop_index = []
        for j in range(i+1,len(ss)):
            if ss[i] == ss[j]:
                a += 1
                pop_index.append(j)
        
        ss = [ss[i] for i in range(len(ss)) if i not in pop_index]
        answer += int(a*(a-1)/2) if a > 1 else 0
    print(answer)
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    s = [next(tokens) for _ in range(N)]  # type: "List[str]"
    solve(N, s)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys
import collections
from itertools import groupby

def solve(N: int, s: "List[str]"):
    s = [sorted(s[i]) for i in range(N)]
    s.sort()
    group = groupby(s)
    answer = 0
    for key, group in group:
        a = len(list(group))
        answer += int(a*(a-1)/2) if a > 1 else 0
    print(answer)
   


    # for i in range(N):
    #     a = 1
    #     pop_index = []
    #     for j in range(i+1,len(ss)):
    #         if ss[i] == ss[j]:
    #             a += 1
    #             pop_index.append(j)
        
    #     ss = [ss[i] for i in range(len(ss)) if i not in pop_index]
    #     answer += int(a*(a-1)/2) if a > 1 else 0
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    s = [next(tokens) for _ in range(N)]  # type: "List[str]"
    solve(N, s)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3
import sys
import collections

def solve(N: int, s: "List[str]"):
    answer = 0
    ss = [collections.Counter(s[i]) for i in range(N)]
    for i in range(N):
        for j in range(i+1,N):
            if ss[i] == ss[j]:
                answer += 1
    print(answer)
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    s = [next(tokens) for _ in range(N)]  # type: "List[str]"
    solve(N, s)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys
import collections
from itertools import groupby

def solve(N: int, s: "List[str]"):
    s = [sorted(s[i]) for i in range(N)]
    s.sort()
    group = groupby(s)
    answer = 0
    for key, group in group:
        a = len(list(group))
        answer += int(a*(a-1)/2) if a > 1 else 0
    print(answer)
   


    # for i in range(N):
    #     a = 1
    #     pop_index = []
    #     for j in range(i+1,len(ss)):
    #         if ss[i] == ss[j]:
    #             a += 1
    #             pop_index.append(j)
        
    #     ss = [ss[i] for i in range(len(ss)) if i not in pop_index]
    #     answer += int(a*(a-1)/2) if a > 1 else 0
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    s = [next(tokens) for _ in range(N)]  # type: "List[str]"
    solve(N, s)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
#!/usr/bin/env python3
import sys
import collections

def solve(N: int, s: "List[str]"):
    answer = 0
    for i in range(N):
        for j in range(i+1,N):
            # print(collections.Counter(s[i]))
            if collections.Counter(s[i]) == collections.Counter(s[j]):
                answer += 1
    print(answer)
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    s = [next(tokens) for _ in range(N)]  # type: "List[str]"
    solve(N, s)

if __name__ == '__main__':
    main()


Fixed submission:
#!/usr/bin/env python3
import sys
import collections
from itertools import groupby

def solve(N: int, s: "List[str]"):
    s = [sorted(s[i]) for i in range(N)]
    s.sort()
    group = groupby(s)
    answer = 0
    for key, group in group:
        a = len(list(group))
        answer += int(a*(a-1)/2) if a > 1 else 0
    print(answer)
   


    # for i in range(N):
    #     a = 1
    #     pop_index = []
    #     for j in range(i+1,len(ss)):
    #         if ss[i] == ss[j]:
    #             a += 1
    #             pop_index.append(j)
        
    #     ss = [ss[i] for i in range(len(ss)) if i not in pop_index]
    #     answer += int(a*(a-1)/2) if a > 1 else 0
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    s = [next(tokens) for _ in range(N)]  # type: "List[str]"
    solve(N, s)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Runtime Error):

N = int(input())
mojiretu = [input() for _ in range(N)]
dict = {}
answer = 0

for n in mojiretu:
  a = ''.join(sorted(list(n)))
  if a in dict.keys():
    dict[a]+=1
  else:
    dict[a]= 1

def fact(n):
    if n == 0 or n == 1:
        return 1
    else:
        return n * fact(n-1) 
      
def nck(n,k):
  return int(fact(n)/(fact(n-k)*fact(k)))
      
for value in dict.values():
	if value > 1:
		answer += nck(value,2)

print(answer)

Fixed submission:
#!/usr/bin/env python3
import sys
import collections
from itertools import groupby

def solve(N: int, s: "List[str]"):
    s = [sorted(s[i]) for i in range(N)]
    s.sort()
    group = groupby(s)
    answer = 0
    for key, group in group:
        a = len(list(group))
        answer += int(a*(a-1)/2) if a > 1 else 0
    print(answer)
   


    # for i in range(N):
    #     a = 1
    #     pop_index = []
    #     for j in range(i+1,len(ss)):
    #         if ss[i] == ss[j]:
    #             a += 1
    #             pop_index.append(j)
        
    #     ss = [ss[i] for i in range(len(ss)) if i not in pop_index]
    #     answer += int(a*(a-1)/2) if a > 1 else 0
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    s = [next(tokens) for _ in range(N)]  # type: "List[str]"
    solve(N, s)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Runtime Error):
N = int(input())
mojiretu = [input() for _ in range(N)]
dict = {}
answer = 0

for n in mojiretu:
  a = ''.join(sorted(list(n)))
  if a in dict.keys():
    dict[a]+=1
  else:
    dict[a]= 1
 

def fact(n):
  if n == 0 or n == 1:
    return 1
  else:
    return n * fact(n-1)

  
for value in dict.values():
	if value > 1:
		answer += fact(value-1)

print(answer)

Fixed submission:
#!/usr/bin/env python3
import sys
import collections
from itertools import groupby

def solve(N: int, s: "List[str]"):
    s = [sorted(s[i]) for i in range(N)]
    s.sort()
    group = groupby(s)
    answer = 0
    for key, group in group:
        a = len(list(group))
        answer += int(a*(a-1)/2) if a > 1 else 0
    print(answer)
   


    # for i in range(N):
    #     a = 1
    #     pop_index = []
    #     for j in range(i+1,len(ss)):
    #         if ss[i] == ss[j]:
    #             a += 1
    #             pop_index.append(j)
        
    #     ss = [ss[i] for i in range(len(ss)) if i not in pop_index]
    #     answer += int(a*(a-1)/2) if a > 1 else 0
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    s = [next(tokens) for _ in range(N)]  # type: "List[str]"
    solve(N, s)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
mojiretu = [input() for _ in range(N)]
mojiretu2 = []
answer = 0

for n in mojiretu:
  mojiretu2.append(sorted(list(n)))
 
for index, moji in enumerate(mojiretu2):
  i = index+1
  while i < N:
    if moji == mojiretu2[i]:
      answer+=1
    i+=1

print(answer)

Fixed submission:
#!/usr/bin/env python3
import sys
import collections
from itertools import groupby

def solve(N: int, s: "List[str]"):
    s = [sorted(s[i]) for i in range(N)]
    s.sort()
    group = groupby(s)
    answer = 0
    for key, group in group:
        a = len(list(group))
        answer += int(a*(a-1)/2) if a > 1 else 0
    print(answer)
   


    # for i in range(N):
    #     a = 1
    #     pop_index = []
    #     for j in range(i+1,len(ss)):
    #         if ss[i] == ss[j]:
    #             a += 1
    #             pop_index.append(j)
        
    #     ss = [ss[i] for i in range(len(ss)) if i not in pop_index]
    #     answer += int(a*(a-1)/2) if a > 1 else 0
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    s = [next(tokens) for _ in range(N)]  # type: "List[str]"
    solve(N, s)

if __name__ == '__main__':
    main()

Buggy python submission (verdict: Time Limit Exceeded):
N = int(input())
mojiretu = [input() for _ in range(N)]
mojiretu2 = []
answer = 0

for n in mojiretu:
  mojiretu2.append(''.join(sorted(list(n))))
 
for index, moji in enumerate(mojiretu2):
  i = index+1
  while i < N:
    if moji == mojiretu2[i]:
      answer+=1
    i+=1

print(answer)

Fixed submission:
#!/usr/bin/env python3
import sys
import collections
from itertools import groupby

def solve(N: int, s: "List[str]"):
    s = [sorted(s[i]) for i in range(N)]
    s.sort()
    group = groupby(s)
    answer = 0
    for key, group in group:
        a = len(list(group))
        answer += int(a*(a-1)/2) if a > 1 else 0
    print(answer)
   


    # for i in range(N):
    #     a = 1
    #     pop_index = []
    #     for j in range(i+1,len(ss)):
    #         if ss[i] == ss[j]:
    #             a += 1
    #             pop_index.append(j)
        
    #     ss = [ss[i] for i in range(len(ss)) if i not in pop_index]
    #     answer += int(a*(a-1)/2) if a > 1 else 0
    return


def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    s = [next(tokens) for _ in range(N)]  # type: "List[str]"
    solve(N, s)

if __name__ == '__main__':
    main()