#include <stl.h>
#include <iostream.h>

int less_10 (int a_)
{
  return a_ < 10 ? 1 : 0;
}

int numbers[6] = { 6, 12, 3, 10, 1, 20 };

int main ()
{
  partition (numbers, numbers + 6, less_10);
  for (int i = 0; i < 6; i++)
    cout << numbers[i] << ' ';
  cout << endl;
  return 0;
}