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 scanner = new Scanner(System.in);
        scanner.useDelimiter("\n");

        while (scanner.hasNext()) {
            String S = scanner.next();
            char[] chars = S.toCharArray();
            int max = 0;
            for (int i = 0; i < chars.length; i++) {
                for (int j = i + 1; j < chars.length; j++) {
                    if (j - i + 1 > max && is(chars, i, j)) {
                        max = j - i + 1;
                    }
                }
            }
            System.out.println(max == 0 ? 1 : max);
        }
    }
    public static boolean is(char[] chars, int left, int right) {
        while (left < right) {
            if (chars[left] != chars[right]) {
                return false;
            }
            left++;
            right--;
        }
        return true;
    }
}