1064 朋友数 (20分)
一、题目:
二、解析:
AC代码:
import java.util.Scanner;
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());
}
}