[Programmers] Level 1 - 완주하지 못한 선수

문제

프로그래머스

 

풀이 1

def solution(participant, completion):
    attendees = {name: 0 for name in participant}

    for name in participant:
        attendees[name] += 1
    
    for name in completion:
        attendees[name] -= 1

    return next(index for index, value in attendees.items() if value == 1)

 

채점 결과

 

풀이 2

from collections import Counter

def solution_refactor(participant, completion):
    return list((Counter(participant) - Counter(completion)).elements())[0]

 

채점 결과