Alien Invasion II

#include <bits/stdc++.h>
using namespace std;

#include <sstream>

int digits (int n) {
  int d = 0;
  while (n!=0) {
    n = n/10;
    d++;
  }
  return d;
}

int sum_of_digits (int n) {
  int sum = 0;
  while (n!=0) {
    sum += n%10;
    n = n/10;
  }
  return sum;
}

int main() {
  int n;
  cin >> n;

  int sum = sum_of_digits(n);
  int aux = 3;
  while (aux < sum) aux += 3;
  int add = aux - sum;

  ostringstream oss;
  oss << add << n;

  istringstream iss(oss.str());
  int num;
  iss >> num;

  cout << num << endl << 3 << ' ' << num/3 << endl;
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER