题解 | #最长回文子串#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        int maxLen = 0;
        for (int i = 0; i < s.length(); i++) {
            for (int j = s.length(); j > i; j--) {
                String subStr = s.substring(i, j);
                if (isHuiWenStr(subStr)) {
                    maxLen = Math.max(j - i, maxLen);
                }
            }
        }
        System.out.print(maxLen);
    }
//是否为回文串
    static boolean isHuiWenStr(String str) {
        return  str.equals( new StringBuilder(str).reverse().toString()) ;
    }
}