题解 | #有效括号序列#

#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
# 
# @param s string字符串 
# @return bool布尔型
#

class Solution:
    def __init__(self):
        self.stack=[]
    def isValid(self , s: str) -> bool:
        # write code her
        if len(s)%2!=0:
            return False
        for i in s:
            if(i=='('):
                self.stack.append(')')
            elif i=='{':
                self.stack.append('}')
            elif i=='[':
                self.stack.append(']')
            elif not self.stack or self.stack[-1]!=i:
                return False
            else:
                self.stack.pop()
        if self.stack:
            return False
        else:
            return True