public static void levelOrder(BstNode root)
{
var q = new GenericDsQueue <BstNode>();
if (root == null)
{
return;
}
q.Enqueue(root);
while (!q.isEmpty())
{
var current = q.getFront();
Console.Write(current.value.value + " ");
if (current.value.left != null)
{
q.Enqueue(current.value.left);
}
if (current.value.right != null)
{
q.Enqueue(current.value.right);
}
q.Dequeue();
}
}
protected override BstNode <T> LeftRightRotation(BstNode <T> node)
{
var newHead = base.LeftRightRotation(node);
if (((AvlNode <T>)newHead).Balance < 0)
{
((AvlNode <T>)node).Balance = 1;
((AvlNode <T>)newHead.LeftChild).Balance = 0;
}
else
{
if (((AvlNode <T>)newHead).Balance == 0)
{
((AvlNode <T>)node).Balance = 0;
((AvlNode <T>)newHead.LeftChild).Balance = 0;
}
else
{
((AvlNode <T>)node).Balance = 0;
((AvlNode <T>)newHead.LeftChild).Balance = -1;
}
}
((AvlNode <T>)newHead).Balance = 0;
return(newHead);
}
static void Main(string[] args)
{
BstNode root = null;
root = Insert(root, 2);
root = Insert(root, -25);
root = Insert(root, 10);
root = Insert(root, 4);
root = Insert(root, -3);
root = Insert(root, 20);
root = Insert(root, 21);
root = Insert(root, 0);
root = Insert(root, 20);
root = Insert(root, 25);
root = Insert(root, 8);
root = Insert(root, 12);
Console.WriteLine(Search(root, 5));
Console.WriteLine(Search(root, 10));
Console.WriteLine(FindMin(root));
Console.WriteLine(FindMax(root));
Console.WriteLine(height(root));
Console.WriteLine();
levelOrder(root);
Console.WriteLine();
PreOrder(root);
Console.WriteLine();
InOrder(root);
Console.WriteLine();
PostOrder(root);
Console.WriteLine();
Console.WriteLine(IsBST(root));
}
protected virtual BstNode <T> LeftRotation(BstNode <T> node)
{
var newHead = node.RightChild;
var newHeadLeftRightChild = newHead.LeftChild;
var newHeadParent = node.Parent;
newHead.Parent = newHeadParent;
node.Parent = newHead;
newHead.LeftChild = node;
node.RightChild = newHeadLeftRightChild;
if (newHeadLeftRightChild != null)
{
newHeadLeftRightChild.Parent = node;
}
if (newHeadParent == null)
{
Root = newHead;
return(newHead);
}
if (newHeadParent.RightChild == node)
{
newHeadParent.RightChild = newHead;
}
else
{
newHeadParent.LeftChild = newHead;
}
return(newHead);
}
private BstNode <T> FindNode(BstNode <T> node, T data)
{
var currentNode = node;
while (currentNode != null)
{
if (data.CompareTo(currentNode.Data) == 0)
{
return(currentNode);
}
if (data.CompareTo(currentNode.Data) < 0)
{
currentNode = currentNode.LeftChild;
continue;
}
if (data.CompareTo(currentNode.Data) > 0)
{
currentNode = currentNode.RightChild;
continue;
}
}
return(null);
}
private bool FromLeft(BstNode <T> node)
{
if (node.HasOneChild && node.Parent.LeftChild == node.OnlyChild) //ak som mal jedno decko a parent ho ma teraz nalavo
{
return(true);
}
if (node.HasOneChild && node.Parent.RightChild == node.OnlyChild) //ak som mal jedno decko a parent ho ma teraz napravo
{
return(false);
}
//teraz uz mozem byt len list
if (node.Parent.RightChild == null && node.Parent.LeftChild == null) //ak parent nema deti (novy list)
{
var n = (AvlNode <T>)node.Parent;
if (n.Balance < 0) //balance sa mu nezmenili
{
return(true); //ak som ho tahal do lava
}
if (n.Balance > 0)
{
return(false); //ak som ho tahal doprava
}
}
//bol som list ale mal som brata
if (node.Parent.RightChild != null) //ak pravy brat stale existuje tak som bol lavy
{
return(true);
}
return(false);
}
public BstNode <T> Minimun()
{
BstNode <T> current = RootNode;
while (current.LeftChild != null)
{
current = current.LeftChild;
}
return(current);
}
private void DoInOrder(BstNode <T> node, Processor processor) //act
{
if (node != null)
{
DoInOrder(node.LeftChild, processor);
Console.WriteLine($"I am: {node.Data} and my parent is {(node.Parent != null ? node.Parent.Data: default(T))}");
//processor(node.Data);
DoInOrder(node.RightChild, processor);
}
}
public BstNode <T> Maximum()
{
BstNode <T> current = RootNode;
while (current.RightChild != null)
{
current = current.RightChild;
}
return(current);
}
public static int FindMax(BstNode root)
{
if (root.right == null)
{
return(root.value);
}
else
{
return(FindMax(root.right));
}
}
private BstNode <T> RightMostValueFromLeftSubTree(BstNode <T> childNode)
{
while (true)
{
if (childNode.RightChild == null)
{
return(childNode);
}
childNode = childNode.RightChild;
}
}
public static int FindMin(BstNode root)
{
if (root.left == null)
{
return(root.value);
}
else
{
return(FindMin(root.left));
}
}
public static int height(BstNode root)
{
if (root == null)
{
return(-1);
}
if (root.left == null && root.right == null)
{
return(0);
}
return(Math.Max(height(root.left), height(root.right)) + 1);
}
static void PreOrder(BstNode root)
{
if (root != null)
{
Console.Write(root.value + " ");
}
if (root.left != null)
{
PreOrder(root.left);
}
if (root.right != null)
{
PreOrder(root.right);
}
}
//adds a value to the tree.
public void Insert(T data)
{
if (RootNode == null)
{
RootNode = new BstNode <T>(data);
}
else
{
BstNode <T> current = RootNode;
bool done = false; //lets us exit the loop when a leaf is added.
while (!done)
{
//check left
if (data.CompareTo(current.Value) < 0)
{
if (current.LeftChild == null)
{
current.LeftChild = new BstNode <T>(data, current);
done = true;
}
current = current.LeftChild;
}
else //check right
{
if (current.RightChild == null)
{
current.RightChild = new BstNode <T>(data, current);
done = true;
}
current = current.RightChild;
}
}
}
////check if the tree has a root, if so, add to the tree,
//if(RootNode != null)
//{
// RootNode.Insert(data);
//}
//else
//{
// //otherwise, the value becomes the root.
// Console.WriteLine($"Inserted {data}");
// RootNode = new BstNode<T>(data);
//}
}
static void PostOrder(BstNode root)
{
if (root == null)
{
return;
}
if (root.left != null)
{
PostOrder(root.left);
}
if (root.right != null)
{
PostOrder(root.right);
}
Console.Write(root.value + " ");
}
protected BstNode <T> DeleteNode(BstNode <T> node, T data)
{
var nodeToDelete = FindNode(node, data);
if (nodeToDelete != null)
{
if (nodeToDelete.LeftChild != null && nodeToDelete.RightChild != null)
{
var rightMostNode = RightMostValueFromLeftSubTree(nodeToDelete.LeftChild);
var savedData = nodeToDelete.Data;
nodeToDelete.Data = rightMostNode.Data; //switch data
rightMostNode.Data = savedData;
nodeToDelete = rightMostNode;
}
if (nodeToDelete.IsLeaf)
{
nodeToDelete.RemoveMeFromParent();
if (nodeToDelete == Root)
{
Root = null;
}
return(nodeToDelete);
}
else if (nodeToDelete.HasOneChild)
{
if (nodeToDelete == Root)
{
Root = Root.OnlyChild;
Root.Parent = null;
return(nodeToDelete);
}
if (nodeToDelete.Parent.LeftChild == nodeToDelete)
{
nodeToDelete.Parent.LeftChild = nodeToDelete.OnlyChild;
}
else
{
nodeToDelete.Parent.RightChild = nodeToDelete.OnlyChild;
}
nodeToDelete.OnlyChild.Parent = nodeToDelete.Parent;
return(nodeToDelete);
}
}
return(null);
}
static bool IsSubtreeGreater(BstNode root, int value)
{
if (root == null)
{
return(true);
}
if (root.value > value &&
IsSubtreeGreater(root.left, value) &&
IsSubtreeGreater(root.right, value)
)
{
return(true);
}
else
{
return(false);
}
}
static bool IsBST(BstNode root)
{
if (root == null)
{
return(true);
}
if (IsSubtreeLesser(root.left, root.value) &&
IsSubtreeGreater(root.right, root.value) &&
IsBST(root.left) &&
IsBST(root.right))
{
return(true);
}
else
{
return(false);
}
}
static BstNode Insert(BstNode root, int value)
{
var newNode = new BstNode(value);
if (root == null)
{
root = newNode;
}
else if (value <= root.value)
{
root.left = Insert(root.left, value);
}
else
{
root.right = Insert(root.right, value);
}
return(root);
}
protected override BstNode <T> RightRotation(BstNode <T> node)
{
var newHead = base.RightRotation(node);
if (((AvlNode <T>)newHead).Balance == 0)
{
((AvlNode <T>)node).Balance = -1;
((AvlNode <T>)newHead).Balance = 1;
}
else
{
((AvlNode <T>)node).Balance = 0;
((AvlNode <T>)newHead).Balance = 0;
}
return(newHead);
}
static bool Search(BstNode root, int value)
{
if (root == null)
{
return(false);
}
else if (root.value == value)
{
return(true);
}
else if (root.value > value)
{
return(Search(root.left, value));
}
else
{
return(Search(root.right, value));
}
}
public BstNode <T> Search(T data)
{
BstNode <T> current = RootNode;
while (current != null)
{
if (data.CompareTo(current.Value) < 0)
{
current = current.LeftChild;
}
else if (data.CompareTo(current.Value) > 0)
{
current = current.RightChild;
}
else if (data.CompareTo(current.Value) == 0)
{
return(current);
}
}
return(null);
}
protected BstNode <T> InsertNode(BstNode <T> newNode, T data)
{
if (Root == null)
{
Root = newNode;
return(Root);
}
var currentNode = Root;
while (currentNode != null)
{
if (data.CompareTo(currentNode.Data) == 0)
{
throw new Exception("Tree already contains such data");
}
if (data.CompareTo(currentNode.Data) < 0)
{
if (currentNode.LeftChild == null)
{
currentNode.LeftChild = newNode;
newNode.Parent = currentNode;
return(currentNode.LeftChild);
}
currentNode = currentNode.LeftChild;
}
else
{
if (currentNode.RightChild == null)
{
currentNode.RightChild = newNode;
newNode.Parent = currentNode;
return(currentNode.RightChild);
}
currentNode = currentNode.RightChild;
}
}
return(null);
}
//constructor
public BstNode(T value, BstNode <T> parent = null)
{
Value = value;
Parent = parent;
}
public BstNode(T data, BstNode <T> parent)
{
Data = data;
Parent = parent;
}
public BstNode(T data)
{
Data = data;
Parent = null;
}
public BST()
{
RootNode = null;
}