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  1. #include <iostream>
  2. using namespace std;
  3. using ll = int64_t;
  4.  
  5. int main() {
  6. 	// your code goes here
  7. 	int n;
  8. 	cin >> n;
  9. 	ll ans=0;
  10. 	for(int i=1;i<n;i++){
  11. 		for(int j=i+1;j<2*i;j++){
  12. 			if(n-i-j>=2*i){
  13. 				ans--;
  14. 			}
  15. 			if(n-i-j<=j){
  16. 				break;
  17. 			}
  18. 			ans++;
  19. 		}
  20. 	}
  21.  	cout << ans << endl;
  22. 	return 0;
  23. }
Success #stdin #stdout 0.01s 5652KB
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https://ideone.com/X9x57A
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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