fork download 
  1. // The sum of 1+(1-2)+(1-2+3)+(1-2+3-n)... where even integers are -k and odd integers are +k.
  2. #include <stdio.h>
  3.  
  4. int ancho(int n)
  5. {
  6. 	int sum=0;
  7. 	for(int i=1; i<=n; ++i)
  8. 	{
  9. 		for(int j=1; j<=i; ++j)
  10. 		{
  11. 			sum += (2*(j%2)-1)*j;
  12. 		}
  13. 	}
  14. 	return sum;
  15. }
  16.  
  17. int main(void)
  18. {
  19. 	int n = 5;
  20.  
  21. 	printf("Solution is %d\n", ancho(n));
  22. }
  23.  
  24. // Solution is 0 for n = 5, 
  25. // because: 1 + (1-2) + (1-2+3) + (1-2+3-4) + (1-2+3-4+5) = 
  26. // 1-1+2-2+3 =
Success #stdin #stdout 0s 5476KB
comments (?)
stdin 
Standard input is empty
stdout 
Solution is 3
https://ideone.com/z1mwCs
language:
C (gcc 8.3)
created:
3 years ago
visibility:
secret

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!