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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	double sum = 0;
  7. 	cin >> n;
  8. 	double x1, x2, x3;
  9. 	cin >> x2 >> x3;
  10.  
  11. 	for (int i = 0; i < n-2; i++ ){
  12. 		x1 = x2;
  13. 		x2 = x3;
  14. 		cin >> x3;
  15. 		sum += (x1 + x2 + x3) * x2;
  16. 	}
  17.  
  18. 	cout << "sum" << " = " << sum;
  19.  
  20. 	return 0;
  21. }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin
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5
0 0 2 -4 7
3
1 2 3
4
1 2 3 4
4
1.1 2.3 4.5 6.7
stdout
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sum = -24
https://ideone.com/l7qlqZ
A156 б
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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