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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. using namespace std;
  5.  
  6. double downhillLength(int h, int r) {
  7.     double ratio = (double)h / r;
  8.     double downhill = sqrt(2 * r * h - h * h);
  9.     return downhill;
  10. }
  11.  
  12. int main() {
  13.     int t;
  14.     cin >> t;
  15.  
  16.     for (int i = 0; i < t; ++i) {
  17.         int h, r;
  18.         cin >> h >> r;
  19.  
  20.         // Kiểm tra điều kiện hợp lệ
  21.         if (h <= r) {
  22.             cout << -1 << endl;
  23.         } else {
  24.             double result = downhillLength(h, r);
  25.             cout << fixed << result << endl;
  26.         }
  27.     }
  28.  
  29.     return 0;
  30. }
  31.  
Success #stdin #stdout 0s 5292KB
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https://ideone.com/Pc9GKr
language:
C++14 (gcc 8.3)
created:
13 days ago
visibility:
public

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