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  1. #include <iostream>
  2. #include <iomanip>
  3. using namespace std;
  4.  
  5.  
  6. int main() {
  7. 	int n;
  8. 	cin >> n;
  9.  
  10. 	double res;
  11.  
  12. 	for (int i = 0; i < n; i++) {
  13. 		double v; bool mode;
  14.  
  15. 		cin >> mode;
  16. 		cin >> v;
  17.  
  18. 		if (mode) res += 1 / v;
  19. 		else res -= 1 / v;
  20. 	}
  21.  
  22. 	if (res > 0) {
  23. 		cout << setprecision(4) << 1 / res;
  24. 	} else {
  25. 		cout << -1;
  26. 	}
  27.  
  28.  
  29. 	return 0;
  30. }
Success #stdin #stdout 0.01s 5320KB
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-1
https://ideone.com/2sNLl0
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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