leetcode--20. Valid Parentheses
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题目:20. Valid Parentheses
链接:https://leetcode.com/problems/valid-parentheses/description/
括号匹配。
python:
class Solution(object): def isValid(self, s): """ :type s: str :rtype: bool """ stack=["#"] for i in range(len(s)): if s[i] in ["[", "{", "("]: stack.append(s[i]) else: if s[i]==")": if stack[-1]!="(": return False else: stack.pop() elif s[i]=="}": if stack[-1]!="{": return False else: stack.pop() elif s[i]=="]": if stack[-1]!="[": return False else: stack.pop() if len(stack)!=1: return False return True
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