历届试题 回文数字

import java.util.Scanner;

public class Main {
    static int N;
    static int cnt = 0;

    public static boolean IsEqual(String str){
        char[] charArray = str.toCharArray();
        int sum = 0;
        boolean flag = false;
        for( int i = 0 ; i < charArray.length ; i++){
            sum += (int) (charArray[i]-'0');
        }
        if ( sum == N){
            flag = true;
        }
        return flag;
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in = new Scanner(System.in);
        N = in.nextInt();
        for ( int i = 10000 ; i < 1000000 ; i++){
            StringBuffer str = new StringBuffer(String.valueOf(i));
            StringBuffer tmp = new StringBuffer(str.toString());
            String reverse = tmp.reverse().toString();
            if (reverse.equals(str.toString()) && IsEqual(str.toString())){
                System.out.println(str);
                cnt++;
            }
        }

        if ( cnt == 0){
            System.out.print(-1);
        }
        in.close();
    }

}