//TODO: copy-paste, parent-setter
protected override BaseTreapNode <T> Delete(int idx, BaseTreapNode <T> tNode)
{
int leftTreeCount = GetTreeLeftCount(tNode);
if (idx < leftTreeCount)
{
tNode.Left = Delete(idx, tNode.Left);
tNode.UpdateAggregate();
return(tNode);
}
if (idx > leftTreeCount)
{
tNode.Right = Delete(idx - leftTreeCount - 1, tNode.Right);
tNode.UpdateAggregate();
return(tNode);
}
ParentTreapNode <T> node = (ParentTreapNode <T>)tNode;
ParentTreapNode <T> parent = node.Parent;
tNode = tNode.DeleteRoot();
if (tNode != null)
{
((ParentTreapNode <T>)tNode).Parent = parent;
}
return(tNode);
}
public override BaseTreapNode <T> RotateRight()
{
ParentTreapNode <T> parent1 = parent;
BaseTreapNode <T> node = base.RotateRight();
((ParentTreapNode <T>)node).Parent = parent1;
return(node);
}
protected override void RightSetter(BaseTreapNode <T> node)
{
base.RightSetter(node);
ParentTreapNode <T> treapNode = node as ParentTreapNode <T>;
if (treapNode != null)
{
treapNode.Parent = this;
}
}
public int GetInverse(ParentTreapNode <T> node)
{
ParentTreapNode <T> input = node;
int res = GetTreeLeftCount(input);
while (input.Parent != null)
{
ParentTreapNode <T> parent = input.Parent;
if (ReferenceEquals(parent.Right, input))
{
res += GetTreeLeftCount(parent) + 1;
}
input = parent;
}
return(res);
}