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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. bool snt(int n) {
  5.     if (n<2) return false;
  6.     for (int i=2;i*i<=n;i++) {
  7.         if (n%i==0) {
  8.         	return false;
  9.         }
  10.     }
  11.     return true;
  12. }
  13.  
  14. int demcs(int n) {
  15.     int d=0;
  16.     while (n>0) {
  17.         d++;
  18.         n/=10;
  19.     }
  20.     return d;
  21. }
  22.  
  23. int main() {
  24.     int n,k;
  25.     cin >> n >> k;
  26.     int m=n,d=demcs(n);
  27.     if (k>=d) {
  28.     	cout << "a) 0" << endl;
  29.     } else {
  30.         for (int i=0;i<k;i++) {
  31.         	n/=10;
  32.         }
  33.         cout << "a) " << n << endl;
  34.     }
  35.     cout << "b) " << d << endl;
  36.     m/=10;
  37.     while (m>0 && !snt(m)) {
  38.     	m/=10;
  39.     }
  40.     if (m>0) {
  41.     	cout << "c) " << m;
  42.     } else {
  43.     	cout << "c) KHONG THE";
  44.     }
  45. }
Success #stdin #stdout 0s 5268KB
comments (?)
stdin
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3079 2
stdout
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a) 30
b) 4
c) 307
https://ideone.com/svtmzy
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

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