1064 number of friends (20 points)

1064 number of friends (20 points)

Link to the original question: Portal

I, entitled:

Second, resolve:

AC Code:

import java.util.Scanner;

/**
 * 1064 朋友数 (20分)
 * 
 * @author: ChangSheng 
 * @date:   2020年1月3日 下午5:56:22
 */
public class Main {
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int N = s.nextInt();
		int[] arr = new int[9+9+9+9+1];
		for (int i = 0; i < N; i++) {
			int num = s.nextInt();
			int sum = 0;
			while (num != 0) {
				sum += num % 10;
				num /= 10;
			}
			arr[sum]++;
		}
		StringBuilder sb = new StringBuilder();
		int count = 0;
		for (int i = 0; i < arr.length; i++) {
			if (arr[i] != 0) {
				count++;
				sb.append(i + " ");				
			}
		}
		System.out.print(count+"\n" + sb.toString().trim());
	}
}