// sample program to show how to use vectors

#include <vector>
#include <iostream>

using namespace std;

main ()
{
  vector < double > v;
  v.push_back (1.1);
  v.push_back (2.2);
  cout << v[0] << "\n";
  int size = v.size ();
  cout << v[size - 1] << "\n";
  v.clear();
  cout << v.size() << "\n";
}