【因为这有三种括号,三个之间的嵌套比较复杂,所以不能简单地使用整形int作为判断(左括号++,右括号--),例如“([)]”这要是使用int那么就会判断正确。】 算法——利用一个栈,如果是左括号则直接放入,如果是右括号,pop栈顶看是否为对应左括号,否则return false;最后检查栈是否为空。 我的代码: 1publicbooleanis...
检查字符是用==,检查String是用.isEqual(),因为String是引用类型,值相等但是地址可能不等。 代码如下: 1publicbooleanisValid(String s) { 2if(s.length()==0||s.length()==1) 3returnfalse; 4 5Stack<Character> x =newStack<Character>(); 6for(inti=0;i<s.length();i++){ 7if(s.charAt(i...
An input string is valid if: 如果输入字符串有效 Open brackets must be closed by the same type of brackets. 必须使用相同类型的括号关闭左括号 Open brackets must be closed in the correct order. 必须用正确的顺序关闭左括号 Note that an empty string is also considered valid. 注意,空字符串也被视...
Output: true 题意:给定一个由括号字符组成的字符串,问是否合法。 思路: 最简单的思路,遍历判断入栈,最后判断栈是否为空。 Code: import java.util.Stack; public class Solution { public boolean isValid(String s) { Stack<Character> stack = new Stack<Character>(); for (char ch : s.toCharArray()...
Java publicclassSolution{publicbooleanisValid(String s){if(s==null||s.length()==0)returnfalse;Stack<Character>parentheses=new Stack<Character>();for(int i=0;i<s.length();i++){char c=s.charAt(i);if(c=='('||c=='['||c=='{')parentheses.push(c);else{if(parentheses.empty())re...
java代码 importjava.util.*;publicclassSolution{publicintlongestValidParentheses(Strings){if(s==null||s.length()<=1){return0;}chararr[]=s.toCharArray();intmax=0;intindex=0;intleftmost=-1;//装放下标Stack<Integer>stack=newStack<>();for(;index<arr.length;index++){if(arr[index]=='(')...
Formatting a negative amount with parentheses Formatting asp.net textbox decimal places Forms auth iis 8.0 - Error message 401.2.: Unauthorized: Logon failed due to server configuration. Forms Authentication - how to exclude certain files Free downlaod open sources inventory management system in...
[Leetcode] Valid Parentheses 验证有效括号对 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 "(]" ...
MinStack.java MyQueue.java StudentAttendanceRecordII.java ValidParentheses.java string tree two_pointers .gitignore README.md build.gradle Breadcrumbs leetcode /problems /src /stack / ValidParentheses.java Latest commit Cannot retrieve latest commit at this time. HistoryHistory File metadata and cont...
当出现:要从栈取字符时而栈为空、字符串遍历完而栈不为空 这 两种情况时,匹配失败。 (2)string s=”abcd”,最低位是a。别犯低级错误! code: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 classSolution{protected:boolcheck(char a,char b){cout<<"a: "<<a<<"b: "<<b<<endl;bool flag=...