protected AATreeNode <T> Insert(AATreeNode <T> node, T item)
{
if (node == null)
{
Count++;
return(new AATreeNode <T> {
Value = item
});
}
int comp = item.CompareTo(node.Value);
switch (comp)
{
case -1:
node.Left = Insert(node.Left, item);
break;
case 1:
node.Right = Insert(node.Right, item);
break;
}
node = Skew(node);
node = Split(node);
// Return node as-is if item is equal
return(node);
}
protected void InorderTraversal(AATreeNode <T> node, Action <T> action)
{
if (node == null)
{
return;
}
InorderTraversal(node.Left, action);
action(node.Value);
InorderTraversal(node.Right, action);
}
private AATreeNode <T> Skew(AATreeNode <T> node)
{
if (node == null)
{
return(null);
}
if (node.Left == null)
{
return(node);
}
if (node.Left.Level == node.Level)
{
var left = node.Left;
node.Left = left.Right;
left.Right = node;
return(left);
}
return(node);
}
private AATreeNode <T> Split(AATreeNode <T> node)
{
if (node == null)
{
return(null);
}
if (node.Right?.Right == null)
{
return(node);
}
if (node.Level == node.Right.Right.Level)
{
var right = node.Right;
node.Right = right.Left;
right.Left = node;
right.Level = right.Level + 1;
return(right);
}
return(node);
}
public override void Add(T item)
{
RootNode = Insert(RootNode, item);
}