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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. unsigned long long stirlingLn(double x) {
  6.   return floor(log10(sqrt(2*acos(-1.0)*x))+x*log10(x/exp(1)))+1;
  7. }
  8.  
  9. int main() {
  10. 	cout << stirlingLn(1e9);
  11. }
Success #stdin #stdout 0s 3140KB
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8565705523
https://ideone.com/KCrQmy
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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