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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4.  
  5. bool isPrime(int x) {
  6.     if (x==0 || x==1) return false;
  7.     if (x==2) return true;
  8.     if (x%2 == 0) return false;
  9.  
  10.     for (int i=3; i<=sqrt(x); i=i+2) {
  11.         if (x%i == 0) return false;
  12.     }
  13.  
  14.     return true;
  15. }
  16. int main()
  17. {
  18.     string s;
  19.     cin>>s;
  20.     int size = s.size();
  21.     set<int> set;
  22.  
  23.     for (int i=0; i<size; i++) {
  24.         for (int j=1; j<=6 && i+j-1<size; j++) {
  25.             int s1 = stoi(s.substr(i, j));
  26.             if (isPrime(s1)){
  27.                 set.insert(s1);
  28.             } 
  29.         }
  30.     }
  31.         cout<<set.size();
  32.  
  33.     return 0;
  34. }
Success #stdin #stdout 0.01s 5296KB
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https://ideone.com/9q9OsF
language:
C++ (gcc 8.3)
created:
19 hours ago
visibility:
public

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