fork download 
  1. /*
  2. * @Author: hungeazy
  3. * @Date:   2026-03-04 23:24:15
  4. * @Last Modified by:   hungeazy
  5. * @Last Modified time: 2026-03-23 21:13:53
  6. */
  7. #include <bits/stdc++.h>
  8. using namespace std;
  9.  
  10. bool KTSNT(int n)
  11. {
  12.     if (n < 2) return false;
  13.     for (int i = 2; i <= sqrt(n); i++)
  14.         if (n%i == 0) return false;
  15.     return true;
  16. }
  17.  
  18. int main()
  19. {
  20.     ios_base::sync_with_stdio(false);
  21.     cin.tie(NULL); cout.tie(NULL);
  22.     string s;
  23.     cin >> s;
  24.     int pos = s.find(','), sum = 0;
  25.     for (int i = 0; i < s.size(); i++)
  26.         if (isdigit(s[i]) == true)
  27.             sum += s[i]-'0';
  28.     if (KTSNT(sum) == false)
  29.     {
  30.         cout << "KHONG";
  31.         return 0;
  32.     }
  33.     bool check = true;
  34.     for (int i = 0; i <= pos-1; i++)
  35.         if (KTSNT(s[i]-'0') == false)
  36.             check = false;
  37.     if (check == false)
  38.     {
  39.         check = true;
  40.         for (int i = pos+1; i < s.size(); i++)
  41.             if (KTSNT(s[i]-'0') == false)
  42.                 check = false;
  43.         if (check == true) cout << "CO";
  44.         else cout << "KHONG";
  45.     }
  46.     else cout << "CO";
  47.     return 0;
  48. }
Success #stdin #stdout 0.01s 5324KB
comments (?)
stdin 
Standard input is empty
stdout 
KHONG
https://ideone.com/k0pWnJ
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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!