[12일차][프로그래머스][133502]햄버거 만들기

def solution(ingredient):
    count = 0
    stack_arr = []
    for data in ingredient:        
        if int(data) == 1 and stack_arr[-3:] == [1,2,3]:      
            stack_arr.pop()
            stack_arr.pop()
            stack_arr.pop()
            count += 1
        else:
            stack_arr.append(data)
    
    return count