Ruudukko

import itertools

def optimize(str):
    combinations = itertools.combinations(list(str), 2)
    return ''.join(map(lambda x: x[0] == x[1] and '1' or '0', list(combinations)))

def solve(input):
    input = map(optimize, input)
    res = 0

    for x in list(set(input)):
        count = input.count(x)
        if count > 1:
            for i in range(1, count):
                res += i

    return res


count = int(raw_input())
input = list()
for x in range(0, count):
    input.append(raw_input())

print(solve(input))

Test 1

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 23, in <module>
    input....

Test 2

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 23, in <module>
    input....

Test 3

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 23, in <module>
    input....

Test 4

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 23, in <module>
    input....

Test 5

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 23, in <module>
    input....

Test 6

Verdict: RUNTIME ERROR

Traceback (most recent call last):
  File "input/code.py", line 23, in <module>
    input....