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  1. #include <stdio.h>
  2. const double EPS = 1e-8;
  3. double foo(double L, double R, double (*f)(double))
  4. {
  5.     while (R - L > EPS)
  6.     {
  7.         double m1 = (2 * L + R) / 3;
  8.         double m2 = (L + 2 * R) / 3;
  9.         if (f(m2) > f(m1))
  10.             L = m1;
  11.         else
  12.             R = m2;
  13.     }
  14.     return L;
  15. }
  16. double func(double x)
  17. {
  18.     return -x * x + 2 * x + 1;
  19. }
  20. int main(void)
  21. {
  22.     double L, R;
  23.     scanf("%lf%lf", &L, &R);
  24.     printf("%0.3lf\n", foo(L, R, func));
  25.     return 0;
  26. }
  27.  
Success #stdin #stdout 0s 9424KB
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https://ideone.com/FBMrFE
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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