fork download
copy 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() 
  5. {
  6. 	int n, m;
  7. 	cin >> n;
  8. 	if (n < 0)
  9. 	{
  10. 	   m = -n;
  11. 	}
  12. 	else
  13. 	{
  14. 		m = n;
  15. 	}
  16. 	unsigned long long int counter = ((1 + m) * m) / 2;
  17.     if (n > 0)
  18.     {
  19. 	      cout << counter;
  20.     }
  21.     else if (n == 0)
  22.     {
  23.     	cout << 1;
  24.     }
  25. 	 else 
  26. 	 {
  27. 	 	cout << counter * - 1 + 1;
  28. 	 }
  29. 	return 0;
  30. }
Success #stdin #stdout 0s 15224KB
comments (?)
stdin
copy 
100
stdout
copy 
5050
https://ideone.com/kv0MO1
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!