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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. bool check1(int k, int n){
  5.     int cnt = 0;
  6.     int tmp = k;
  7.     while (tmp) {
  8.         ++cnt;
  9.         tmp /= 10;
  10.     }
  11.     return cnt == n;
  12. }
  13.  
  14. bool check2(int k){
  15.     if (k <= 1) return false;
  16.     for (int i = 2; i * i <= k; i++) {
  17.         if (k % i == 0)
  18.             return false;
  19.     }
  20.     return true;
  21. }
  22.  
  23. bool check3(int k){
  24.     int tong = 0;
  25.     int tmp = k;
  26.     while (tmp) {
  27.         tong += tmp % 10;
  28.         tmp /= 10;
  29.     }
  30.     return check2(tong);
  31. }
  32.  
  33. bool check4(int k){
  34.     int tmp = k;
  35.     while (tmp) {
  36.         if (!check2(tmp % 10))
  37.             return false;
  38.         tmp /= 10;
  39.     }
  40.     return true;
  41. }
  42.  
  43. int main() {
  44.     int n, k; cin >> n >> k;
  45.     if (check4(k) && check3(k) && check2(k) && check1(k, n))
  46.         cout << "YES\n";
  47.     else
  48.         cout << "NO\n";
  49. }
  50.  
Success #stdin #stdout 0.01s 5276KB
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stdin
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Standard input is empty
stdout
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NO
https://ideone.com/QljAgi
language:
C++14 (gcc 8.3)
created:
5 hours ago
visibility:
public

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