题解 | 最长的括号子串

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     *
     * @param s string字符串
     * @return int整型
     */
    public int longestValidParentheses (String s) {
        char[] charArray = s.toCharArray();
        //记录左括号的位置
        Stack<Integer> stack = new Stack<>();
        for (int i = 0; i < charArray.length; i++) {
            if (charArray[i] == '(') {
                stack.push(i);
            }
            if (charArray[i] == ')') {
                if (!stack.isEmpty()) {
                    Integer pop = stack.pop();
                    charArray[pop] = '1';
                    charArray[i] = '1';
                }
            }
        }

        int count = 0;
        int max = 0;
        for (int i = 0; i < charArray.length; i++) {

            if (charArray[i] == '1') {
                count++;
                if (count > max) {
                    max = count;
                }
            } else {
                count = 0;
            }
        }
        return max;
    }
}