public int Pop()
{
NodeWithMin temp = last;
last = last.Next;
return(temp.Data);
}
public void Push(int item)
{
int minvalue = GetMin();
if (item < minvalue)
{
minvalue = item;
}
NodeWithMin newitem = new NodeWithMin(item, minvalue);
newitem.Next = last;
last = newitem;
}