#include <algorithm>
#include <iostream>

int main( ) {
   int a[10] = { 1, 3, 4, 6, 8, 9, 11, 13, 17, 19 };
   for (int v = 0; v <= 20; ++v) {
      std::cout << v << ": " << busqueda_binaria(&a[0], &a[0] + 10, v) << "\n";
   }
}