위장 (프로그래머스 코딩테스트 연습-해시)

 

from collections import defaultdict
 
 
def solution(clothes):
    clot = defaultdict(list)
    for item in clothes:
        clot[item[1]].append(clot[item[0]])
    
    answer = 1
    for key in clot.keys():
        answer *= (len(clot[key])+1)
    return answer-1