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  1. #include <iostream>
  2. using namespace std;
  3. int main(){
  4. 	int n;
  5. 	cin >> n;
  6. 	int s = 0;
  7. 	for(int i = 0;i<=n;i++){
  8. 		if(i%2==0) s = s - i;
  9. 		else s = s + i;
  10.  
  11. }
  12. cout << s;
  13. }
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/N3xlsp
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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