fork download 
  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. bool ktra(int a)
  5. {
  6.     if (a < 2)
  7.     {
  8.         return false;
  9.     }
  10.     if (a == 2 || a == 3)
  11.     {
  12.         return true;
  13.     }
  14.     if (a % 2 == 0 || a % 3 == 0)
  15.     {
  16.         return false;
  17.     }
  18.     for (int i = 5; i * i <= a; i += 6)
  19.     {
  20.         if (a % i == 0 || a % (i + 2) == 0)
  21.         {
  22.             return false;
  23.         }
  24.     }
  25.     return true;
  26. }
  27.  
  28. int main()
  29. {
  30.     int n;
  31.     cin >> n;
  32.     while (n != 0)
  33.     {
  34.         if (!ktra(n))
  35.         {
  36.             cout << "NO";
  37.             return 0;
  38.         }
  39.         n /= 10;
  40.     }
  41.     cout << "YES";
  42. }
  43.  
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin 
Standard input is empty
stdout 
NO
https://ideone.com/Vn0yh3
language:
C++ (gcc 8.3)
created:
250 days ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!