코딩테스트 고득점 Kit - 해시 3 (Level 2)

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from collections import defaultdict

def solution(clothes):
    answer = 0

    comb = defaultdict(list)
    for val, key in clothes:
        comb[key].append(val)

    answer = 1
    for val in comb.values():
        answer *= len(val) + 1
    answer -= 1

    return answer