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  1. #include <iostream>
  2. #include <vector>
  3. #include <string>
  4. #include <algorithm>
  5. #include <cmath>
  6.  
  7. using namespace std;
  8.  
  9. long long a, b, c;
  10.  
  11.  
  12. float gpa(int n) {
  13.     return (float)(2 * a + 3 * b + 4 * c + 5 * n) / (a + b + c + n);
  14. }
  15.  
  16. long double f(long double x)
  17. {
  18. return x * x;
  19. }
  20.  
  21. int main() {
  22.     long double c, left = 0, right = 1e15, middle, eps =10e-10;
  23.     cin >> c;
  24.     if (c < 0) cout << "No solutions!";
  25.     else {
  26.         while (fabs(right - left) > eps) {
  27.         middle = (left + right) / 2.0;
  28.         if (f(middle) - c < 0) left = middle;
  29.         else right = middle;
  30.         }
  31.         cout << fixed;
  32.         cout.precision(2);
  33.         cout << right;
  34.     }
  35.     return 0;
  36. }
Success #stdin #stdout 0.01s 5504KB
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https://ideone.com/Lypop3
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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