햄버거 만들기

나의 코드

def solution(ingredient):

    answer=0

    list_ingredient = []

    for i in ingredient:

        list_ingredient.append(i)

        if list_ingredient[-4:] == [1,2,3,1]:

            del list_ingredient[-4:]

            answer+=1

    print(answer)

    return answer

solution([2, 1, 1, 2, 3, 1, 2, 3, 1])