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  1. #include <iostream>
  2. #include <iomanip>
  3.  
  4. using namespace std;
  5.  
  6. unsigned long long isFact(unsigned long long N)
  7. {
  8.     unsigned long long f = 1;
  9.     for(unsigned long long i = 1; f < N; ++i)
  10.     {
  11.         if ((f *= i) == N) return i;
  12.     }
  13.     return 0;
  14. }
  15.  
  16. int main(int argc, const char * argv[])
  17. {
  18.     cout << isFact(5039) << endl;
  19.     cout << isFact(5040) << endl;
  20.     cout << isFact(5041) << endl;
  21. }
  22.  
Success #stdin #stdout 0s 4372KB
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https://ideone.com/55dtZo
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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