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

int main ()
{
  vector<int> v (4);
  v[0] = 1;
  v[1] = 4;
  v[2] = 9;
  v[3] = 16;
  cout << "front = " << v.front () << endl;
  cout << "back = " << v.back () << ", size = " << v.size () << endl;
  v.push_back (25);
  cout << "back = " << v.back () << ", size = " << v.size () << endl;
  v.pop_back ();
  cout << "back = " << v.back () << ", size = " << v.size () << endl;
  return 0;
}