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  1. #include <iostream>
  2. using namespace std;
  3. int main() {
  4. 	// номер 8 P2
  5. 	double fp, fpp, fppp;
  6. 	cin >> fppp >> fpp >> fp;
  7. 	int n;
  8. 	double x;
  9. 	cin >> n >> x;
  10. 	double ans = 0;
  11. 	if (n >= 0) ans += fppp;
  12. 	if (n >= 1) ans += fpp*x;
  13. 	if (n >= 2) ans += fp*x*x;
  14. 	double X = x*x*x;
  15. 	for (int i = 3; i <= n; i += 1) {
  16. 		const double f = fp * fpp - 3 * fppp;
  17. 		X *= x;
  18. 		ans += X * f;
  19. 		fppp = fpp;
  20. 		fpp = fp;
  21. 		fp = f;
  22. 	}
  23. 	cout << ans << "\n";
  24. }
Success #stdin #stdout 0.01s 5320KB
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Standard input is empty
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-nan
https://ideone.com/aCLkH2
language:
C++ (gcc 8.3)
created:
15 days ago
visibility:
public

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