AC

```#include <bits/stdc++.h>
using namespace std;
int u;
int main(){
	int num[10] = {};
	int flag = 0;
    for (int x = 1;x <= 9;x ++){
        for (int y = 1;y <= 9;y ++){
            for (int z = 1;z <= 9;z ++){
                u = x * 100 + y * 10 + z;
                int a = u * 2,b = u * 3;
                if (a > 999 || b > 999) continue;
                int a_1 = a % 10,a_2 = a / 10 % 10,a_3 = a / 100;
				int b_1 = b % 10,b_2 = b / 10 % 10,b_3 = b / 100;
                num[x] ++;
                num[y] ++;
                num[z] ++;
                num[a_1] ++;
                num[a_2] ++;
                num[a_3] ++;
                num[b_1] ++;
                num[b_2] ++;
                num[b_3] ++;
                for (int i = 1;i <= 9;i ++){
                	if (num[i] > 1 || num[i] == 0){
 			            flag = 1;
  	             		break;
					}
				}
	   			if(!flag)cout << u << " " << a << " " << b << endl;
	   			flag = 0;
	   			for (int i = 1;i < 10;i ++) num[i]=0;
            }
        }
    }
    return 0;
}