[프로그래머스] Level 2 : 위장 (Python)

[프로그래머스]  Level 2 : 위장 (Python)

 

목차

 

 

 

https://school.programmers.co.kr/learn/courses/30/lessons/42578

프로그래머스

 

코드 링크

https://github.com/stellaluminary/Programmers

GitHub - stellaluminary/Programmers

 

 

Python

 

방법 1 

 

def solution(clothes):
    answer = 1
    d = {}

    for name, type in clothes:
        if type not in d:
            d[type] = ['', name]
        else:
            d[type].append(name)

    for i in d:
        answer *= len(d[i])
    return answer - 1

 

방법 2 

 

def solution(clothes):
    answer = 1
    d = {}

    for name, type in clothes:
        if type not in d:
            d[type] = 2
        else:
            d[type] += 1

    for i in d.values():
        answer *= i
    return answer - 1

 

 

방법 3 

 

def solution(clothes):
    from collections import Counter
    from functools import reduce
    cnt = Counter([kind for name, kind in clothes])
    # Noramlly use like "reduce(function, list or dict)"
    # However, we can use with additional initial value
    # "reduce(function, list or dict, initial value)"

    answer = reduce(lambda x, y: x*(y+1), cnt.values(), 1) - 1
    return answer