fork download
copy 
  1. /*
  2. * @Author: hungeazy
  3. * @Date:   2026-03-04 23:24:15
  4. * @Last Modified by:   hungeazy
  5. * @Last Modified time: 2026-03-11 23:03:10
  6. */
  7. #include <bits/stdc++.h>
  8. using namespace std;
  9. string s;
  10.  
  11. bool KTSNT(int n)
  12. {
  13.     if (n < 2) return false;
  14.     for (int i = 2; i <= sqrt(n); i++)
  15.         if (n%i == 0) return false;
  16.     return true;
  17. }
  18.  
  19. int main()
  20. {
  21.     ios_base::sync_with_stdio(false); 
  22.     cin.tie(NULL); cout.tie(NULL);
  23.     cin >> s;
  24.     int n = s.size(), sum = 0, pos = -1;
  25.     bool check = true;
  26.     for (int i = 0; i < n; i++)
  27.         if (s[i] == ',') pos = i;
  28.         else sum += s[i]-'0';
  29.     for (int i = 0; i < n; i++)
  30.     {
  31.         if (s[i] == ',') break;
  32.         int c = s[i]-'0';
  33.         if (!KTSNT(c))
  34.         {
  35.             check = false;
  36.             break;
  37.         }
  38.     }
  39.     if (!KTSNT(sum))
  40.     {
  41.         cout << "KHONG";
  42.         return 0;
  43.     }
  44.     if (check and KTSNT(sum))
  45.     {
  46.         cout << "CO";
  47.         return 0;
  48.     }
  49.     check = true;
  50.     for (int i = pos+1; i < n; i++)
  51.     {
  52.         int c = s[i]-'0';
  53.         if (!KTSNT(c))
  54.         {
  55.             check = false;
  56.             break;
  57.         }
  58.     }
  59.     if (check and KTSNT(sum)) cout << "CO";
  60.     else cout << "KHONG";
  61.     return 0;
  62. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
KHONG
https://ideone.com/u0vyBQ
language:
C++14 (gcc 8.3)
created:
5 hours 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!