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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. constexpr unsigned floorlog2(unsigned x)
  5. {
  6.     return x == 1 ? 0 : 1+floorlog2(x >> 1);
  7. }
  8.  
  9. constexpr unsigned ceillog2(unsigned x)
  10. {
  11.     return x == 1 ? 0 : floorlog2(x - 1) + 1;
  12. }
  13.  
  14.  
  15. int main() {
  16.         cout << ceillog2(2) << endl;
  17.  
  18. 	// your code goes here
  19. 	return 0;
  20. }
Success #stdin #stdout 0s 3296KB
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https://ideone.com/6ztr7X
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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