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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	ios::sync_with_stdio(false);
  7.     cin.tie(nullptr);
  8.  
  9. 	int r;
  10. 	cin >> r;
  11. 	int count = 4*r + 1;
  12.  
  13.  
  14. 	for (int i = 1; i<=r; i++){
  15. 		count += 4*floor(sqrt(r*r-i*i));
  16. 	}
  17. 	cout << count;
  18. 	return 0;
  19. }
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/IJslvv
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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