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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define task "DPRIME3"
  4. #define ll long long int
  5. #define pb push_back
  6. #define el "\n"
  7. #define vpll vector<pair<ll, ll>> 
  8. #define vll vector<long long>
  9. #define pii pair<int, int>
  10. #define pqll priority_queue
  11. const ll N = 1e6 + 2;
  12. const ll MOD = 1e9 + 7;
  13. const ll INF = 1e5;
  14. ll n, x, y, z;
  15. vector<bool> f(MOD, 1);
  16. void tassk(){
  17.     ios_base::sync_with_stdio(0);
  18.     cin.tie(0);
  19.     cout.tie(0);
  20.     if (fopen(task".inp","r"))
  21.     {
  22.         freopen(task".inp","r",stdin);
  23.         freopen(task".out","w",stdout);
  24.     }
  25. }
  26. void solve() {
  27.     f[0] = f[1] = 0;
  28.     cin >> n;
  29.     for (int i = 2; i <= sqrt(n); i++){
  30.         if (f[i]){
  31.             for (int j = i * i; j <= n; j += i){
  32.                 f[j] = 0;
  33.             }
  34.         }
  35.     }
  36.     ll dem = 0;
  37.     for (int y = 3; y <= sqrt(n - 4); y++){
  38.         if (f[y]){
  39.             z = y * y + 4;
  40.             if (f[z]){
  41.                 cout << 2 << " " << y << " " << z << el;
  42.                 dem++;
  43.             }
  44.         }
  45.     }
  46.     if (dem == 0) cout << -1;
  47. }
  48. int main()
  49. {
  50.     tassk();
  51.     solve();
  52.     return 0;
  53. }
  54.  
Success #stdin #stdout 0.02s 125340KB
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stdin
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Standard input is empty
stdout
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-1
https://ideone.com/m7O2Zs
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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