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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. int  sum(int n){
  5. 	double  s=0; 
  6. 	for(int i=1;i<=n;i++){
  7. 		s+= (pow(-1,i+1))*i;
  8. 	} 
  9. 	return s; 
  10. } 
  11. int main(){
  12. int n;
  13. cin>>n;
  14. int  s=sum(n);
  15.  cout<<s; 
  16. return 0;
  17. }
Success #stdin #stdout 0.01s 5276KB
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16384
https://ideone.com/980ng9
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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