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  1. #include<bits/stdc++.h>
  2. //Phan Thanh Nhàn
  3. using namespace std;
  4. double c1a(int n,int x){
  5. 	if(n==1)	return sqrt(x);
  6. 	return sqrt(x+c1a(n-1,x));
  7. }
  8.  
  9. double c1b(int n,int x){
  10. 	double sum=0;
  11. 	for(int i=1;i<=n;i++){
  12. 	sum+=x;
  13. 	sum=sqrt(sum);	
  14. 	}
  15. 	return sum;
  16. }
  17. int main(){
  18. 	int n;cin>>n;
  19. 	cout<<c1b(n,2);
  20.  
  21.  
  22.  
  23. }
Success #stdin #stdout 0.01s 5288KB
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stdin 
Standard input is empty
stdout 
2
https://ideone.com/vGVIdP
language:
C++14 (gcc 8.3)
created:
280 days ago
visibility:
public

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