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 isValid(self , s: str) -> bool:
        # write code here
        stack = []
        d = {"(":")","[":"]","{":"}"}
        for c in s:
            if stack and stack[-1] in "([{" and d[stack[-1]] == c:
                stack.pop()
            else:
                stack.append(c)
        if stack:
            return False
        else:
            return True