private AvlNode LeftRotate(AvlNode root)
{
var newRoot = root.GetRightChild();
root.SetRightChild(newRoot.GetLeftChild());
newRoot.SetLeftChild(root);
SetHeight(root);
SetHeight(newRoot);
return(newRoot);
}
private AvlNode Balance(AvlNode root)
{
if (IsLeftHeavy(root))
{
if (BalanceFactor(root.GetLeftChild()) < 0)
{
//Console.WriteLine("Left Rotate " + root.GetLeftChild().GetValue());
root.SetLeftChild(LeftRotate(root.GetLeftChild()));
}
//Console.WriteLine("Right Rotate" + root.GetValue());
return(RightRotate(root));
}
if (IsRightHeavy(root))
{
if (BalanceFactor(root.GetRightChild()) > 0)
{
root.SetRightChild(RightRotate(root.GetRightChild()));
//Console.WriteLine("Right Rotate " + root.GetRightChild().GetValue());
}
//Console.WriteLine("Left Rotate " + root.GetValue());
return(LeftRotate(root));
}
return(root);
}
private AvlNode Insert(AvlNode root, int value)
{
if (root == null)
{
return(new AvlNode(value));
}
if (value > root.GetValue())
{
root.SetRightChild(Insert(root.GetRightChild(), value));
}
else
{
root.SetLeftChild(Insert(root.GetLeftChild(), value));
}
SetHeight(root);
return(Balance(root));
}
private int BalanceFactor(AvlNode node)
{
return(node == null ? 0 : Height(node.GetLeftChild()) - Height(node.GetRightChild()));
}
private void SetHeight(AvlNode node)
{
node.SetHeight(Math.Max(
Height(node.GetLeftChild()),
Height(node.GetRightChild())) + 1);
}