import java.util.Stack; class Solution { public boolean isValid(String s) { Stack<Character> stack_match = new Stack<Character>(); for(int i=0;i<s.length();i++){ if(s.charAt(i)=='(' || s.charAt(i)=='[' || s.charAt(i)=='{'){ stack_match.push(s.charAt(i)); }else...
【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...
【LeetCode 20. Valid Parentheses】(合法括号匹配判断,栈的应用),题目链接Givenastringcontainingjustthecharacters‘(‘,‘)’,‘{‘,‘}’,‘[’and‘]’,determineiftheinputstringisvalid.Aninputstringisvalidif:Openbracketsmustbeclosedbythesametyp...
package leetcode._20;import java.util.Stack;publicclassSolution{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.isEmpty()){returnfalse;}chartop=stack...
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...
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...