[baekjoon]python #4949 균형잡힌 세상

[baekjoon]python #4949 균형잡힌 세상

https://www.acmicpc.net/problem/4949

4949번: 균형잡힌 세상

while True:
    a=input()
    stack=[]
    flag=1

    if a=='.':
        break

    for i in a:
        if i=='[' or i=='(':
            stack.append(i)

        elif i==']':
            if len(stack) !=0 and stack[-1] =='[':
                stack.pop()
            else:
                stack.append(']')
                flag=0
                break

        elif i==')':
            if len(stack) !=0 and stack[-1] == '(':
                stack.pop()
            else:
                stack.append(')')
                flag=0
                break

    print('yes' if flag and not(stack) else 'no')