private TAvlNode <int, int> _Add(TAvlNode <int, int> curNode, int key, int value)
{
if (curNode == null)
{
var newNode = new TAvlNode <int, int> (key, value);
newNode.Height = 1;
return(newNode);
}
if (key < curNode.Key)
{
curNode.Left = _Add(curNode.Left, key, value);
curNode.Height++;
}
else if (key > curNode.Key)
{
curNode.Right = _Add(curNode.Right, key, value);
curNode.Height++;
}
else
{
//curNode.Key == key;
curNode.Value = value;
}
//Rotate if node now becomes unbalanced.
var factor = curNode.GetBalanceFactor();
if (factor > 1 && curNode.Left != null && curNode.Left.GetBalanceFactor() > 1)
{
//LL
}
if (factor < 0 && curNode.Right != null && curNode.Right.GetBalanceFactor() > 1)
{
//RR
}
if (factor > 1 && curNode.Left != null && curNode.Right.GetBalanceFactor() > 1)
{
//LR
}
if (factor < 0 && curNode.Right != null && curNode.Left.GetBalanceFactor() > 1)
{
//RL
}
return(curNode);
}
private bool _IsBalanced(TAvlNode <int, int> node)
{
if (node == null)
{
return(true);
}
if (Math.Abs(node.GetBalanceFactor()) > 1)
{
return(false);
}
else
{
return(_IsBalanced(node.Left) && _IsBalanced(node.Right));
}
}