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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main(){
  4. 	int n;
  5. 	cin>>n;
  6. 	long long s=0;
  7. 	for(int i=0;i<=n;i++){
  8. 		s=s+pow(-1,i+1)*i;
  9. 	}
  10. 	cout<<s;
  11. }
  12.  
Success #stdin #stdout 0.01s 5288KB
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Standard input is empty
stdout
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10950
https://ideone.com/wywG9h
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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