protected virtual BinarySearchTreeNode <T> DoDeleteRecursive(T value, BinarySearchTreeNode <T> root, ref bool result)
{
if (root == null)
{
result = false;
return(root);
}
int comparisonResult = Compare(root.Value, value);
if (comparisonResult == 0)
{
if (root.IsFull)
{
BinarySearchTreeNode <T> .ExchangeValues(root, DoGetMaximum(root.Left));
root.SetLeft(DoDeleteRecursive(value, root.Left, ref result));
}
else
{
root = root.Left ?? root.Right;
}
}
else if (comparisonResult < 0)
{
root.SetRight(DoDeleteRecursive(value, root.Right, ref result));
}
else
{
root.SetLeft(DoDeleteRecursive(value, root.Left, ref result));
}
return(root);
}
protected override BinarySearchTreeNode <T> DoDeleteRecursive(T value, BinarySearchTreeNode <T> root, ref bool result)
{
if (root == null)
{
result = false;
return(root);
}
int comparisonResult = Compare(root.Value, value);
if (comparisonResult == 0)
{
if (root.IsFull)
{
BinarySearchTreeNode <T> .ExchangeValues(root, DoGetMaximum(root.Left));
root.SetLeft(DoDeleteRecursive(value, root.Left, ref result));
root = EnsureBalanced(root, x => GetHeight(x.Right.Left) > GetHeight(x.Right.Right), RotateRL, RotateRR);
}
else
{
root = root.Left ?? root.Right;
}
}
else if (comparisonResult < 0)
{
root.SetRight(DoDeleteRecursive(value, root.Right, ref result));
root = EnsureBalanced(root, x => GetHeight(x.Left.Left) > GetHeight(x.Left.Right), RotateLL, RotateLR);
}
else
{
root.SetLeft(DoDeleteRecursive(value, root.Left, ref result));
root = EnsureBalanced(root, x => GetHeight(x.Right.Left) > GetHeight(x.Right.Right), RotateRL, RotateRR);
}
if (root != null)
{
root.SetHeight(Math.Max(GetHeight(root.Left), GetHeight(root.Right)) + 1);
}
return(root);
}