LeetCode_20---Valid Parentheses

来源：互联网发布：网站流量统计软件编辑：程序博客网时间：2024/05/20 18:48

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.

翻译：

Code:

import java.util.HashMap;import java.util.Stack;/** * @author MohnSnow * @time 2015年6月5日 下午3:36:49 *  */public class LeetCode20 {/** * @param argsmengdx *            -fnst *///288msA---没有前五行的时候316mspublic static boolean isValid(String s) {int len = s.length();if (len == 0)return true;if (len % 2 != 0)return false;HashMap<Character, Character> map = new HashMap<Character, Character>();map.put('(', ')');map.put('[', ']');map.put('{', '}');System.out.println(map.keySet().toString());Stack<Character> stack = new Stack<Character>();for (int i = 0; i < s.length(); i++) {char curr = s.charAt(i);if (map.keySet().contains(curr)) {stack.push(curr);} else if (map.values().contains(curr)) {if (!stack.empty() && map.get(stack.peek()) == curr) {stack.pop();} else {return false;}}}return stack.empty();}public static void main(String[] args) {String s = "{}{}[][][]{}]}[{[()())()))(()";System.out.println(isValid(s));}}

0 0