// T(n) = O(n); S(n) = O(h) (height)
private IEnumerator <T> GetInOrderEnumerator()
{
Stack <AvlNode <T> > stack = new Stack <AvlNode <T> >();
AvlNode <T> current = Root;
while (current.IsNotNull() || !stack.IsEmpty)
{
while (current.IsNotNull())
{
stack.Push(current);
current = current.Left;
}
if (!stack.IsEmpty)
{
current = stack.Pop();
yield return(current.Item);
current = current.Right;
}
}
}
private AvlNode <T> Find(AvlNode <T> node, T item)
{
AvlNode <T> current = node;
while (current.IsNotNull())
{
if (current.Item.CompareTo(item) == 0)
{
return(current); // Match
}
else if (current.Item.CompareTo(item) > 0)
{
current = current.Left;
}
else
{
current = current.Right;
}
}
return(null); // Not found.
}
public AvlTree(T rootItem)
{
Root = new AvlNode <T>(rootItem);
}
private static int GetNodeHeight(AvlNode <T> node)
{
return(node.IsNull() ? -1 : node.Height);
}
private bool IsRoot(AvlNode <T> node)
{
return(Root.Item.CompareTo(node.Item) == 0);
}
private static AvlNode <T> DoubleWithRightChild(AvlNode <T> k1)
{
k1.Right = RotateWithLeftChild(k1.Right);
return(RotateWithRightChild(k1));
}
private static AvlNode <T> DoubleWithLeftChild(AvlNode <T> k3)
{
k3.Left = RotateWithRightChild(k3.Left);
return(RotateWithLeftChild(k3));
}