/// <summary>
/// Searches for an element that matches the conditions defined by the specified
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
public Node <T> FindNode(Node <T> node)
{
if (node == null)
{
return(null);
}
Node <T> temp = root;
while (temp != null)
{
if (temp.CompareTo(node) == 0)
{
return(temp);
}
if (temp > node)
{
temp = temp.Left;
}
else
{
temp = temp.Right;
}
}
return(null);
//throw new NotImplementedException();
}
/// <summary>
/// Searches for an element that matches the conditions defined by the specified
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="root"></param>
/// <param name="node"></param>
/// <returns></returns>
public static Node <T> FindNode <T>(this Node <T> root, Node <T> node) where T : IComparable
{
if (node == null)
{
return(null);
}
Node <T> temp = root;
while (temp != null)
{
if (temp.CompareTo(node) == 0)
{
return(temp);
}
if (temp > node)
{
temp = temp.Left;
}
else
{
temp = temp.Right;
}
}
return(null);
}
/// <summary>
/// Searches for an parent of element that matches the conditions defined by the specified
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
public Tuple <Node <T>, int> FindParent(Node <T> node)
{
int check = 0;
if (node == null)
{
return(null);
}
Node <T> temp = root;
Node <T> parent = null;
while (temp != null)
{
if (temp.CompareTo(node) == 0)
{
return(new Tuple <Node <T>, int>(parent, check));// temp;
}
if (temp > node)
{
parent = temp;
check = -1;
temp = temp.Left;
}
else
{
parent = temp;
check = 1;
temp = temp.Right;
}
}
return(null);
}
/// <summary>
/// Determines whether an element is in the BST
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
public bool Contains(Node <T> nodeMatch, Node <T> nodeRoot)
{
Node <T> temp = nodeRoot;
if (nodeMatch == null)
{
return(false);
}
while (temp != null)
{
if (temp.CompareTo(nodeMatch) == 0)
{
return(true);
}
if (temp > nodeMatch)
{
temp = temp.Left;
}
else
{
temp = temp.Right;
}
}
return(false);
}
private int _insert(TK key, TV value)
{
var newNode = new Node <TK, TV>(key, value);
var nodes = SearchNodes(key);
var previousNode = nodes.Item1;
var currentNode = nodes.Item2;
Tuple <Node <TK, TV>, Node <TK, TV>, bool> newChildren;
if (currentNode != null)
{
if (!currentNode.ChildrenM.Item3)
{
return(0);
}
newNode.ChildrenM = currentNode.ChildrenM;
}
if (previousNode == null)
{
if (null != CompareExchange(ref _root, newNode, null))
{
return(-1);
}
return(0);
}
var oldChildren = previousNode.ChildrenM;
switch (newNode.CompareTo(previousNode))
{
case 1:
newChildren = new Tuple <Node <TK, TV>, Node <TK, TV>, bool>
(oldChildren.Item1, newNode, oldChildren.Item3);
if (!ReferenceEquals(oldChildren,
CompareExchange(ref previousNode.ChildrenM, newChildren, oldChildren)))
{
return(-1);
}
break;
case -1:
newChildren = new Tuple <Node <TK, TV>, Node <TK, TV>, bool>
(newNode, oldChildren.Item2, oldChildren.Item3);
if (!ReferenceEquals(oldChildren,
CompareExchange(ref previousNode.ChildrenM, newChildren, oldChildren)))
{
return(-1);
}
break;
default:
throw new ArgumentException("Unexpected return in Node's CompareTo");
}
return(0);
}
public int Rank(Node <T> node, Node <T> nodeTree)
{
if (nodeTree == null)
{
return(0);
}
int cmp = node.CompareTo(nodeTree);
if (cmp < 0)
{
return(Rank(node, nodeTree.Left));
}
else if (cmp > 0)
{
return(1 + Size(nodeTree.Left) + Rank(node, nodeTree.Right));
}
else
{
return(Size(nodeTree.Left));
}
}
/// <summary>
/// Remove a element in BST
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
private bool Remove(Node <T> item, Node <T> nodeTree)
{
Node <T> node = nodeTree;
if (item == null)
{
return(false);
}
while (node != null)
{
if (node.CompareTo(item) == 0)
{
if (node.Right == null && node.Left == null)//no child
{
var parent = FindParent(node);
if (parent.Item1 == null)
{
root = null;
return(false);
}
parent.Item1.Left = parent.Item2 == -1 ? null : parent.Item1.Left;
parent.Item1.Right = parent.Item2 == 1 ? null : parent.Item1.Right;
return(true);
}
if (node.Right == null)
{
node.Data = node.Left.Data;
var right = node.Left == null ? null : node.Left.Right;
node.Left = node.Left == null ? null : node.Left.Left;
node.Right = right;
return(true);
}
else if (node.Left == null)
{
node.Data = node.Right.Data;
var left = node.Right == null ? null : node.Right.Left;
node.Right = node.Right == null ? null : node.Right.Right;
node.Left = left;
return(true);
}
else//two child
{
var suc = Successor(node) as Node <T>;// (T)node.Successor();
//var nodeFind = FindNode(suc);
var parent = FindParent(suc);
if (parent.Item1.Data.Equals(item.Data))
{
parent.Item1.Right = suc.Right;
node.Data = suc.Data;
return(true);
}
if (suc.Right != null)
{
parent.Item1.Right = suc.Right;
}
else
{
parent.Item1.Left = null;
}
node.Data = suc.Data;
return(true);
}
}
if (node < item)
{
node = node.Right;
}
else
{
node = node.Left;
}
}
return(false);
//throw new NotImplementedException();
}
