题解HJ85 | #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 in = new Scanner(System.in);

        String s = in.nextLine();

        int maxLength = 0;

        for (int i = 0; i < s.length(); i++) {
            for (int j = i + 2; j <= s.length(); j++) {
                if (check(s.substring(i, j))) {
                    if (j - i - 1 > maxLength) {
                        maxLength = j - i;
                    }
                }
            }
        }

        System.out.println(maxLength);
    }

    public static boolean check(String s) {
        boolean flag = false;

        if (s.length() == 1) {
            flag = true;

            return flag;
        } else if (s.length() == 2 && s.charAt(0) == s.charAt(1)) {
            flag = true;

            return flag;
        } else {
            if (s.charAt(0) == s.charAt(s.length() - 1)) {
                return check(s.substring(1, s.length() - 1));
            }

            return flag;
        }
    }
}

很简单 做的很顺