题解 | #密码截取#

暴力枚举所有情况，找到最长字符串

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);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            String a = in.nextLine();
            System.out.println(cathcerWork(a));
            //System.out.println(isSuccess(a));
        }
    }
    public static int cathcerWork(String a) {
        int maxLen = 0;
        for (int i = 0; i < a.length(); i++) {
            for (int j = a.length(); j >= i; j--) {
                String temp = a.substring(i, j);
                int tempLent = temp.length();
                if (tempLent < maxLen) {
                    break;
                }
                if (isSuccess(temp)) {
                    maxLen = tempLent;
                    break;
                }
            }
        }
        return maxLen;
    }
    public static boolean isSuccess(String a) {
        int length = a.length();
        for (int i = 0; i < length / 2 + 1; i++) {
            if (a.charAt(i) != a.charAt(length- i - 1)) {
                return false;
            }
        }
        return true;
    }
}