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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. void fop_strange(long long upper, long long lower, long long* freq)
  6. {
  7.     long long i, j;
  8.     if (lower == 2) { *freq = upper; }
  9.     else { *freq = upper - lower; }
  10.     for (i = lower; i <= upper; ++i)
  11.         for (j = (long long)sqrt(i); j>1; --j)
  12.             if (i%j == 0) { --(*freq); break; }
  13.     return;
  14. }
  15.  
  16. long long fop(long long a, long long b) {
  17.   long long f = 0;
  18.   fop_strange (b, a, &f);
  19.   return f;
  20. }
  21.  
  22. int main() {
  23.   cout << fop(2, 4) << endl;
  24.   cout << fop(10, 14) << endl;
  25.   return 0;
  26. }
Success #stdin #stdout 0s 3412KB
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https://ideone.com/BUNgru
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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