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  1. #include<bits/stdc++.h>
  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. 		S+=pow(-1,i+1)*i;
  9. 	}
  10. 	cout<<S;
  11. 	return 0;
  12. }
Success #stdin #stdout 0.01s 5284KB
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Standard input is empty
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10941
https://ideone.com/quBbaN
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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