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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. bool isPrime(int x){
  6.     if(x < 2) return false;
  7.     for(int i = 2 ; i * i <= x ; i++)
  8.         if(x % i == 0) return false;
  9.     return true;
  10. }
  11.  
  12. int main() {
  13.     string s;
  14.     getline(cin , s);
  15.  
  16.     // xác định vị trí của dấu phẩy 
  17.     int id = -1;
  18.  
  19.     for(int i = 0 ; i < s.size() ; i++)
  20.         if(s[i] == ','){
  21.             id = i;
  22.             break;
  23.         }
  24.  
  25.     bool dk1 = true;
  26.  
  27.     for(int i = id + 1 ; i < s.size() ; i++){
  28.         if(isPrime(s[i] - '0') == false){
  29.             dk1 = false;
  30.             break;
  31.         }
  32.     }
  33.  
  34.     int sum = 0;    
  35.     for(int i = 0 ; i < s.size() ; i++){
  36.         if(i == id) continue;
  37.         sum += s[i] - '0';
  38.     }
  39.  
  40.     //cout << sum << " " << dk1 << endl;
  41.  
  42.     if(isPrime(sum) == true && dk1 == true)
  43.         cout << "CO" << endl;
  44.     else cout << "KHONG" << endl;
  45. }
Success #stdin #stdout 0s 5324KB
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Standard input is empty
stdout
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KHONG
https://ideone.com/qlOvEg
language:
C++14 (gcc 8.3)
created:
15 hours ago
visibility:
public

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