[프로그래머스] 큰 수 만들기 (42883, 파이썬)

def solution(number, k):
    answer = ""
    stack = []

    for i in number:
        while stack and stack[-1] < i and k > 0:
            k -= 1
            stack.pop()
        stack.append(i)
    while stack and k > 0:
        stack.pop()
        k -= 1
    for i in stack:
        answer += i
    return answer



number = "4321"
k = 1
print(solution(number, k))