【LeetCode】2. Valid Parentheses·有效的括号 秦她的菜 吉利 程序员 来自专栏 · Leetcode刷题笔记 题目描述 英文版描述 Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.An input string is valid if: Open ...
classSolution{privateHashMap<Character, Character> mappings;publicSolution(){this.mappings =newHashMap<Character, Character>();this.mappings.put(')','(');this.mappings.put('}','{');this.mappings.put(']','['); }publicbooleanisValid(String s){ Stack<Character> stack =newStack<Character>(...
classSolution{publicbooleanisValid(String s){ Stack<Character> stack =newStack<>();for(inti=0; i<s.length(); i++) {charc=s.charAt(i);if(c =='('|| c =='['|| c =='{') { stack.push(c); }else{if(stack.empty()) {returnfalse; }chartopChar=stack.pop();if(c ==')'&...
determine if the input string is valid. The brackets must close in the correct order,"()"and"()[]{}"are all valid but"(]"and"([)]"are not. 原题链接:https://oj.leetcode.com/problems/valid-parentheses/ 题目:给定一个仅包括'(',')','{','}','['和']' 的字符串,检測输入的串是...
2. 求解过程 ## 整体思路:如果碰到左括号,就压入栈底,如果是右括号,就和栈内元素进行配对## 栈顶的左括号,必须和新进来的右括号进行匹配,负责就是非法字符串## 这是一个比较巧妙的方法,先在栈底部加入一个元素,以解决空字符串的问题classSolution(object):defisValid(self,s):""":type s: str 字符串...
The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]" and "([)]" are not. 2. 思路 如果是有效的,则符合有序的先进后出序列,构造栈进行模拟验证。 顺序扫描,遇到左括号进栈,遇到右括号弹栈进行匹配,不匹配则失败。匹配则继续。
LeetCode之Valid Parentheses 1、题目 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"([)]"are not....
LeetCode之Valid Parentheses 1、题目 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"([)]"are not....
Leetcode20 - 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 "([)]" are not....
Longest Valid Parentheses 题目 https://leetcode.com/problems/longest-valid-parentheses/description/ 找出最长的合法括号组合子串。 思路及解法 这道题是20. Valid Parentheses的进阶。20题是用栈存储字符来完成的。这道题也会用的到栈,但是如果存储字符......