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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	double a, sum;
  7. 	int n;
  8. 	cin >> n;
  9. 	sum =  0;
  10. 	for(int i =  0; i < n; i++)
  11.   	{
  12. 		cin >> a;
  13. 		sum += a;
  14.   	}
  15. 	cout << 2*sum*sum;
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 3476KB
comments (?)
stdin 
4
0.5 2.5 -0.7 2.6
stdout 
48.02
https://ideone.com/Q0cUmW
сумма элементов
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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