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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. double stirling(double x) {
  6.   return sqrt(2*acos(-1.0)*x)*pow(x/exp(1.0),x);
  7. }
  8.  
  9. unsigned long fd (unsigned long x) {
  10.   return floor(log(stirling(x))) + 1;
  11. }
  12.  
  13. int main() {
  14. 	cout << fd(10);
  15. 	return 0;
  16. }
Success #stdin #stdout 0s 3096KB
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https://ideone.com/xXxuHO
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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