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=[s[0]]
        try:
            for i in range(1,len(s)):
                if (s[i]==')' and stack[-1]=='(') or (s[i]==']' and stack[-1]=='[') or (s[i]=='}' and stack[-1]=='{'):
                    stack.pop()
                else:
                    stack.append(s[i])
            return len(stack)==0
        except:
            return False