public void Push(Object value)
{
if(!_values.ContainsKey(value))
{
_values.Add(value, value);
Node temp = new Node(value);
temp.next = _head;
_head = temp;
}
}
public Object Pop()
{
if (_head != null)
{
Node temp = _head;
_head = _head.next;
temp.next = null;
_values.Remove(temp.data);
return temp.data;
}
else
{
return null;
}
}
public Problem2()
{
_head = null;
_values = new Hashtable();
}
public Node(Object value)
{
next = null;
data = value;
}