PROGRAMMERS 42576: 완주하지 못한 선수

Link : programmers.co.kr/learn/courses/30/lessons/42576

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Python

def solution(participant, completion):
    data = dict()
    for i in participant:
        if i not in data:
            data[i] = 1
        else:
            data[i] += 1
 
    for i in completion:
        if i not in data:
            return i
        else:
            data[i] -= 1
 
    for i in data:
        if data[i] >= 1:
            return i

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