小易爱回文

暴力
isHuiWen 双指针判断是不是回文
reverse 把原来的word逆序 从最后一个字符开始加 是回文就返回

import java.util.Scanner;
import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        String word = in.nextLine();

        if(isHuiWen(word)) {System.out.println(word); return;}

        String re_word = reverse(word);

        for(int i = re_word.length()-1; i>0;i--){
            String temp = word + re_word.substring(i,re_word.length());
            if(isHuiWen(temp)) {System.out.println(temp); return;}
        }
        return;
    }
    public static boolean isHuiWen(String word){
        int i=0;
        int j=word.length()-1;
        while(i<=j){
            if(word.charAt(i) == word.charAt(j)){
                i++;j--;
            }else return false;
        }
        return true;
    }
    public static String reverse(String word){
        String new_word = "";
        for(int i=0; i< word.length(); i++){
            new_word = word.charAt(i) + new_word;
        }
        return new_word;
    }
}