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

int v1[3] = { 13, 18, 23 };
int v2[4] = { 10, 13, 17, 23 };
int result[4] = { 0, 0, 0, 0 };

int main ()
{
  set_difference (v1, v1 + 3, v2, v2 + 4, result);
  for (int i = 0; i < 4; i++)
    cout << result[i] << ' ';
  cout << endl;
  set_difference (v2, v2 + 4, v1, v1 + 2, result);
  for (i = 0; i < 4; i++)
    cout << result[i] << ' ';
  cout << endl;
  return 0;
}