public void Push(int x)
{
if (head == null)
{
head = new Node_minStack(x, x, null);
}
else
{
head = new Node_minStack(x, Math.Min(x, head.min), head);
}
}
public void Pop()
{
head = head.next;
}
public Node_minStack(int val, int min, Node_minStack next)
{
this.val = val;
this.min = min;
this.next = next;
}
