코딩테스트 고득점 Kit - 해시 1 (Level 1)

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from collections import Counter

def solution(participant, completion):
    p = Counter(participant)
    c = Counter(completion)
    p = p - c
    answer = list(p.keys())[0]
    return answer

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def solution(participant, completion):
    answer = ''
    temp = 0
    dic = {}
    for part in participant:
      dic[hash(part)] = part
      temp += int(hash(part))
    for com in completion:
      temp -= hash(com)
    answer = dic[temp]
    return answer