leetcode个人题解——#20 Valid Parentheses

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leetcode个人题解——#20 Valid Parentheses

class Solution { public: bool isValid(string s) { stack<char> brackts; ; i < s.size(); i++) { if(s[i] == '(' || s[i] == '[' || s[i] == '{') brackts.push(s[i]); else if(brackts.empty() || s[i] == ')' && brackts.top() != '(' || s[i] == ']'…

《LeetBook》leetcode题解(20):Valid Parentheses[E]——栈解决括号匹配问题

我现在在做一个叫<leetbook>的免费开源书项目,力求提供最易懂的中文思路,目前把解题思路都同步更新到gitbook上了,需要的同学可以去看看书的地址:https://hk029.gitbooks.io/leetbook/ 20. Valid Parentheses 问题 Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[’ and ‘]’, determine if the input string…

LeetCode解题笔记 - 20. Valid Parentheses

这星期听别人说在做LeetCode,让他分享一题来看看.试了感觉挺有意思,可以培养自己的思路,还能方便的查看优秀的解决方案.准备自己也开始. 解决方案通常有多种多样,我觉得把自己的解决思路记录下来,阶段性查看,一定能对自己有帮助. 这是我做的第一题,所以记录也从这题开始,之后尽力以简短的说明,描述出思路,方便以后能回顾到简介明了的记录. 20. Valid Parentheses Given a string containing just the characters '(', ')', '{…

leetCode练题——20. Valid Parentheses

1.题目 20. Valid Parentheses——Easy Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brac…

LeetCode题解(20)--Valid Parentheses

https://leetcode.com/problems/valid-parentheses/ 原题: Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}"…

LeetCode记录之20——Valid Parentheses

09.18更新算法采用栈的思想解决,方法①所示. 本题主要是找是否有匹配的字符串,因为还没有复习到栈之类的知识点,只能还是采用暴力方法了,后期会补上更加优化的算法.我的思路就是先遍历一遍找是否有匹配的符号,有的话就删除,然后继续遍历,直至结束. Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brac…

<LeetCode OJ> 20. Valid Parentheses

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]"…

【leetcode❤python】 20. Valid Parentheses

#-*- coding: UTF-8 -*-#利用栈的思想#如果输入的左测扩则入栈,如果输入为右侧扩,判断其是否与当前栈顶配对,如果匹配则删除这一对,否则return False#'(', ')', '{', '}', '[' and ']'class Solution(object): def isValid(self, s): """ :type s: str :rtype: bool ""…

[Leetcode][Python]20: Valid Parentheses

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 20: Valid Parentheseshttps://oj.leetcode.com/problems/valid-parentheses/ Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is vali…

20. Valid Parentheses【leetcode】

20. Valid Parentheses Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]&quo…

leetcode 20. Valid Parentheses 、32. Longest Valid Parentheses 、

20. Valid Parentheses 错误解法: "[])"就会报错,没考虑到出现')'.']'.'}'时,stack为空的情况,这种情况也无法匹配 class Solution { public: bool isValid(string s) { if(s.empty()) return false; stack<char> st; st.push(s[]); ;i < s.size();i++){ if(s[i] == '(' || s[i] == '['…

乘风破浪：LeetCode真题_032_Longest Valid Parentheses

乘风破浪:LeetCode真题_032_Longest Valid Parentheses 一.前言这也是非常有意思的一个题目,我们之前已经遇到过两个这种括号的题目了,基本上都要用到堆栈来解决,这次最简单的方法当然也不例外. 二.Longest Valid Parentheses 2.1 问题 2.2 分析与解决通过分析题意,这里我们有几种方法: 暴力算法: public class Solution { public boolean isValid(String s)…

Leetcode 题目整理-5 Valid Parentheses & Merge Two Sorted Lists

20. Valid Parentheses Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]&quo…

刷题20. Valid Parentheses

一.题目说明这个题目是20. Valid Parentheses,简单来说就是括号匹配.在学数据结构的时候,用栈可以解决.题目难度是Medium. 二.我的解答栈涉及的内容不多,push.pop.top,. 我总共提交了3次: 第1次:Runtime Error,错误原因在于pop的时候,未判断栈是否为空. 第2次:Wrong Answer,这个是"眼大"疏忽导致的,我写的时候只考虑了()[]未考虑{}. 第3次:终于正确了,性能还可以: Runtime: 0 ms, faster…

[LeetCode] 20. Valid Parentheses 验证括号

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct…

C# 写 LeetCode easy #20 Valid Parentheses

20.Valid Parentheses Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be…

[LeetCode] 20. Valid Parentheses 合法括号

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct…

[leetcode]20. Valid Parentheses有效括号序列

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct…

leetCode 20.Valid Parentheses (有效的括号) 解题思路和方法

Valid Parentheses Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]"…

[Leetcode][Python]32: Longest Valid Parentheses

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 32: Longest Valid Parentheseshttps://oj.leetcode.com/problems/longest-valid-parentheses/ Given a string containing just the characters '(' and ')',find the length of the longest valid (well…