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  1. #include <iostream>
  2. #include <math.h>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int n;
  7. 	cin >> n;
  8. 	int a[n];
  9. 	for (int i=0; i<n; i++) {
  10. 		cin >> a[i];
  11. 	}
  12. 	double sum=0;
  13. 	int f=1;
  14. 	for (int i=1; i<=n; i++) {
  15. 		f*=i;
  16. 		double sign = (i%2==0) ? 1 : -1;
  17. 		sum+=(sign*a[i-1])/f;
  18. 	}
  19. 	cout << sum << endl;
  20. 	return 0;
  21. }
Success #stdin #stdout 0s 3432KB
comments (?)
stdin 
5
0 0 0 2 3
stdout 
0.0583333
https://ideone.com/F0UyqY
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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