public void Remove(int x)
{
var node = Find(x); //splay of x
//merge left and right childs
if (node != null)
{
node.LeftChild.Parent = null;
node.RightChild.Parent = null;
var resultTree = Merge(new SplayTree {
Root = node.LeftChild
}, new SplayTree {
Root = node.RightChild
});
Root = resultTree.Root;
}
}
private void Splay(SplayTreeNode v)
{
while (v.Parent != null)
{
if (v.Value == v.Parent.LeftChild.Value)
{
if (v.Parent.Parent == null)
{
RotateRight(v.Parent);
}
else if (v.Parent.Value == v.Parent.Parent.LeftChild.Value)
{
RotateRight(v.Parent.Parent);
RotateRight(v.Parent);
}
else
{
RotateRight(v.Parent);
RotateLeft(v.Parent);
}
}
else
{
if (v.Parent.Parent == null)
{
RotateLeft(v.Parent);
}
else if (v.Parent.Value == v.Parent.Parent.RightChild.Value)
{
RotateLeft(v.Parent.Parent);
RotateLeft(v.Parent);
}
else
{
RotateLeft(v.Parent);
RotateRight(v.Parent);
}
}
}
Root = v;
}
public SplayTree(int[] list)
{
foreach (var item in list)
{
var current = SearchCurrent(item, Root);
if (current == null)
{
var root = new SplayTreeNode(item);
Root = root;
}
else
{
var node = new SplayTreeNode(item, current);
if (current.Value < item)
{
current.RightChild = node;
}
else
{
current.LeftChild = node;
}
}
}
}
public SplayTreeNode(int val, SplayTreeNode parent = null, SplayTreeNode left = null, SplayTreeNode right = null)
{
Value = val;
Parent = parent;
LeftChild = left;
RightChild = right;
}