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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	vector<int> n;
  7. 	vector<double> x;
  8. 	int a, sum2 = 0;
  9. 	double b, res = 0, sum1 = 0; 
  10. 	while (cin >> a >> b) 
  11. 	{ 
  12. 		n.push_back(a); 
  13. 		x.push_back(b); 
  14. 	} 
  15. 	for (int i=0; i < x.size(); i++) 
  16. 	{ 
  17. 		sum1 += n[i] * x[i];
  18. 		sum2 += n[i];
  19. 		res = sum1 / sum2;
  20. 	} 
  21. 	cout << res << endl; 
  22. 	return 0;
  23. }
Success #stdin #stdout 0s 3460KB
comments (?)
stdin 
3 -0.5 2 -0.4 1 -0.3 5 32 11 5 20 -1
stdout 
4.58095
https://ideone.com/63WBJF
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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