public void AddTo(AVLTreeNode <T> node, T value)
{
if (value.CompareTo(node.Value) < 0)
{
if (node.Left == null)
{
node.Left = new AVLTreeNode <T>(value, node, this);
}
else
{
AddTo(node.Left, value);
}
}
else
{
if (node.Right == null)
{
node.Right = new AVLTreeNode <T>(value, node, this);
}
else
{
AddTo(node.Right, value);
}
}
node.Balance();
}
//delete
public bool Remove(T value)
{
AVLTreeNode <T> current;
current = Find(value);
if (current == null)
{
return(false);
}
AVLTreeNode <T> treeToBalance = current.Parent;
Count--;
if (current.Right == null)
{
if (current.Parent == null)
{
Head = current.Left;
if (Head != null)
{
Head.Parent = null;
}
}
else
{
int result = current.Parent.CompareTo(current.Value);
if (result > 0)
{
current.Parent.Left = current.Left;
}
else if (result < 0)
{
current.Parent.Right = current.Left;
}
}
}
else if (current.Right.Left == null)
{
current.Right.Left = current.Left;
if (current.Parent == null)
{
Head = current.Right;
if (Head != null)
{
Head.Parent = null;
}
}
else
{
int result = current.Parent.CompareTo(current.Value);
if (result > 0)
{
current.Parent.Left = current.Right;
}
else if (result < 0)
{
current.Parent.Right = current.Right;
}
}
}
else
{
AVLTreeNode <T> leftmost = current.Right.Left;
while (leftmost.Left != null)
{
leftmost = leftmost.Left;
}
leftmost.Parent.Left = leftmost.Right;
leftmost.Left = current.Left;
leftmost.Right = current.Right;
if (current.Parent == null)
{
Head = leftmost;
if (Head != null)
{
Head.Parent = null;
}
}
else
{
int result = current.Parent.CompareTo(current.Value);
if (result > 0)
{
current.Parent.Left = leftmost;
}
else if (result < 0)
{
current.Parent.Right = leftmost;
}
}
}
if (treeToBalance != null)
{
treeToBalance.Balance();
}
else
{
if (Head != null)
{
Head.Balance();
}
}
return(true);
}