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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. using namespace std;
  5.  
  6. const int MAXA = 1000000;
  7. int sum_div[MAXA + 5];
  8.  
  9. int main() {
  10.     ios_base::sync_with_stdio(false);
  11.     cin.tie(NULL);
  12.  
  13.     for (int i = 1; i <= MAXA; ++i) {
  14.         for (int j = i * 2; j <= MAXA; j += i) {
  15.             sum_div[j] += i;
  16.         }
  17.     }
  18.  
  19.     return 0;
  20.  
  21.     int n;
  22.     if (cin >> n) {
  23.         vector<int> res;
  24.         for (int i = 0; i < n; ++i) {
  25.             int x;
  26.             cin >> x;
  27.             if (sum_div[x] > x) {
  28.                 res.push_back(x);
  29.             }
  30.         }
  31.  
  32.         cout << res.size() << "\n";
  33.         for (int i = 0; i < (int)res.size(); ++i) {
  34.             cout << res[i] << (i == (int)res.size() - 1 ? "" : " ");
  35.         }
  36.         cout << "\n";
  37.     }
  38.  
  39.     return 0;
  40. }
Success #stdin #stdout 0.04s 7396KB
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https://ideone.com/Dw9gkn
language:
C++14 (gcc 8.3)
created:
8 hours ago
visibility:
public

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