Output: false Example 4: Input: s = "([)]" Output: false Example 5: Input: s = "{[]}" Output: true Constraints: 1 <= s.length <= 104 s consists of parentheses only '()[]{}'. After trying to finish this problem,I did solve the question with a not very good way.And I f...
20. Valid Parentheses (JAVA) 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 order...
import java.util.Stack; class Solution { public boolean isValid(String s) { Stack<Character> stack_match = new Stack<Character>(); for(int i=0;i
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. 栈法 复杂度 时间O(...
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....
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. ...
建议和leetcode 32. Longest Valid Parentheses 最长有效括号长度和 leetcode 678. Valid Parenthesis String 有效括号的判断 一起学习 代码如下: import java.util.ArrayList; import java.util.List; public class Solution { public boolean isValid(String s) ...
[leetcode] 20. Valid Parentheses (easy) 原题链接 匹配括号思路: 用栈,遍历过程中,匹配的成对出栈;结束后,栈空则对,栈非空则错。 Runtime: 4 ms, faster than 99.94% of Java class Solution { public boolean isValid(String s) { Stack<Character> sta = new Stack<Character>(); for (int i ...
Leetcode上Valid Parentheses问题的时间复杂度是多少? 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 “...
java编程算法数据结构http 链接:https://leetcode.com/problems/valid-parentheses/#/description 难度:Easy 题目:20. Valid Parentheses Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid. The brackets must close i...