없는 숫자 더하기

문제:
https://programmers.co.kr/learn/courses/30/lessons/86051

풀이:

def solution(numbers):
    answer = 0
    cnt=[0]*10
    for x in numbers:
        cnt[x]=1
    for idx, value in enumerate(cnt):
        if value == 0:
            answer+=idx        
    return answer

한번에 풀었다!