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  1. #include <iostream>
  2. using namespace std;
  3. int main() {
  4. 	int a,n,m;
  5. 	double s=0,q;
  6. 	cin>>n;
  7. 	for(int i=1;i<=n;i++){
  8. 		m=i;
  9. 		q=1;
  10. 		for(int j=1;j<=m;j++){
  11. 			q=q*2;	
  12. 		}
  13. 		s+=(2*i-1)/q;
  14. 	}
  15. 	cout<<s<<endl;
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 3472KB
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stdout
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https://ideone.com/47K757
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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