private string PrintNode(AvlNode node, int tabs = 0)
{
var prefix = "\n|";
for (int i = 0; i < tabs; i++)
{
prefix += "--";
}
if (node == null)
{
return(prefix + "None");
}
tabs++;
return(prefix + "V: " + node.Value + "" + PrintNode(node.Left, tabs) + "" + PrintNode(node.Right, tabs));
}
public AvlNode DeleteNode(AvlNode root, int key)
{
if (root == null)
{
return(root);
}
if (key < root.Value)
{
root.Left = DeleteNode(root.Left, key);
}
else if (key > root.Value)
{
root.Right = DeleteNode(root.Right, key);
}
else
{
if (root.Left == null || root.Right == null)
{
AvlNode temp = null;
if (temp == root.Left)
{
temp = root.Right;
}
else
{
temp = root.Left;
}
if (temp == null)
{
temp = root;
root = null;
}
else
{
root = temp;
}
}
else
{
var temp = MinValueNode(root.Right);
root.Value = temp.Value;
root.Right = DeleteNode(root.Right, temp.Value);
}
}
if (root == null)
{
return(root);
}
root.Height = Math.Max(Height(root.Left), Height(root.Right)) + 1;
var balance = GetBalance(root);
if (balance > 1 && GetBalance(root.Left) >= 0)
{
return(RightRotate(root));
}
if (balance > 1 && GetBalance(root.Left) < 0)
{
root.Left = LeftRotate(root.Left);
return(RightRotate(root));
}
if (balance < -1 && GetBalance(root.Right) <= 0)
{
return(LeftRotate(root));
}
if (balance < -1 && GetBalance(root.Right) > 0)
{
root.Right = RightRotate(root.Right);
return(LeftRotate(root));
}
return(root);
}