static void Main(string[] args)
{
while (true)
{
string[] values = { "andrew", "kisya", "kotik", "evgen", "wkola", "ryry", "kiol",
"sam", "slava", "baking", "brut", "truba", "lul", "poggers","pog","pogu",
"strong", "easy", "hard", "imp" };
var tree = new AVLTree.AVLTree();
Random rand = new Random();
string entered = "";
while (true)
{
Console.Clear();
tree.Draw();
Console.SetCursorPosition(0, 15);
Console.WriteLine("Press 0 for restart");
Console.WriteLine("Entered values: " + entered);
Console.Write("Enter the value: ");
try
{
int value = Convert.ToInt32(Console.ReadLine());
if (value == 0)
{
break;
}
tree.Add(value);
entered += value.ToString() + ", ";
}
catch { continue; }
}
}
}
static void Main(string[] args)
{
//int[] nums = { 64, 28, 26, 80, 50, 77, 82, 3, 65, 16, 9, 87, 38, 67, 69, 49, 10, 79, 15, 62, 30, 48, 52, 31, 19, 35, 59, 41, 97, 92, 22, 37, 7, 70, 78, 21, 72, 96, 91, 73, 4, 54, 27, 75, 46, 44, 51, 84, 57, 2, 42, 93, 33, 13, 88, 94, 55, 43, 5, 40, 18, 36, 76, 60, 86, 45, 25, 99, 39, 95, 71, 66, 81, 90, 6, 53, 24, 11, 56, 98, 14, 20, 83, 61, 23, 74, 68, 12, 17, 29, 34, 32, 8, 0, 63, 85, 89, 47, 58, 1 };
int[] nums = { 15, 10, 24, 25, 9, 13, 14, 23, 0, 5, 4, 8, 11, 17, 2, 12, 21, 16, 22, 6, 3, 18, 7, 20, 1, 19 };
//int[] nums = { 1, 0, 6, 3, 9, 2, 7, 8, 5, 4 };
//int[] nums = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,12};
//int[] nums = { 7, 6, 5, 4, 3, 2, 1 };
//int[] nums = {1,5,7,6,8,9};
var tree = new AVLTree<int>();
Console.Write("AVL tree\n\nWild list:\n ");
foreach (var i in nums) {
Console.Write(i + " ");
tree.Add(i);
}
Console.Write("\n\nSorted list:\n ");
foreach (var i in tree)
Console.Write(i + " ");
Console.Write("\n\nTree count:\n {0}", tree.Count);
Console.Write("\n\nVertical tree draw:\n ");
Console.Write(tree.ToString());
Console.Write("\n\nTree root's historical balances:\n ");
foreach (int i in tree.HistoricalBalances)
Console.Write("{0} ", i);
Console.Write("\n\nHistorical roots:\n ");
foreach (var i in tree.HistoricalRoots)
Console.Write("{0} ", i);
Console.ReadKey();
}
public AVLTreeNode(TNode value, AVLTreeNode <TNode> parent, AVLTree <TNode> tree)
{
Value = value;
Parent = parent;
_tree = tree;
}
static void Main(string[] args)
{
AVLTree tree = new AVLTree();
bool flag = true;
while (flag)
{
Console.Clear();
Console.WriteLine("Demo: AVLTree of Integer");
Console.WriteLine("--------------------------------");
Console.WriteLine("1 - Insert node");
Console.WriteLine("2 - Delete node");
Console.WriteLine("3 - Search node");
Console.WriteLine("4 - Traverse Tree In-Order");
Console.WriteLine("5 - Display Tree");
Console.WriteLine("6 - Exit");
Console.WriteLine("--------------------------------");
ConsoleKeyInfo cki = Console.ReadKey(true);
switch (cki.Key)
{
case ConsoleKey.D1:
Console.WriteLine("Enter node to insert:");
string insertInput = Console.ReadLine();
if (Int32.TryParse(insertInput, out int insertNode))
{
tree.Insert(insertNode);
Console.WriteLine("Node " + insertNode + " has been inserted.");
}
else
{
Console.WriteLine("Invalid input. Enter integer number");
}
Console.WriteLine("\nPress any key...");
Console.ReadLine();
break;
case ConsoleKey.D2:
Console.WriteLine("Enter node to delete:");
string deleteInput = Console.ReadLine();
if (Int32.TryParse(deleteInput, out int deleteNode))
{
if (tree.Search(deleteNode) == null)
{
Console.WriteLine("No such node in the tree");
}
else
{
tree.Delete(deleteNode);
Console.WriteLine("Node " + deleteNode + " has been deleted.");
}
}
else
{
Console.WriteLine("Invalid input. Enter integer number");
}
Console.WriteLine("\nPress any key...");
Console.ReadLine();
break;
case ConsoleKey.D3:
tree.PrintTree();
Console.WriteLine("Enter node to search:");
string getInput = Console.ReadLine();
if (Int32.TryParse(getInput, out int getNode))
{
if (tree.Search(getNode) != null)
{
Console.WriteLine("Node " + getNode + " is present in the tree");
}
else
{
Console.WriteLine("No such node in the tree");
}
}
else
{
Console.WriteLine("Invalid input. Enter integer number");
}
Console.WriteLine("\nPress any key...");
Console.ReadLine();
break;
case ConsoleKey.D4:
Console.WriteLine("Current tree In-Order traverse:");
tree.TraverseInOrder();
Console.WriteLine("\nPress any key...");
Console.ReadLine();
break;
case ConsoleKey.D5:
Console.WriteLine("Current tree(from left to right):");
tree.PrintTree();
Console.WriteLine("\nPress any key...");
Console.ReadLine();
break;
case ConsoleKey.D6:
flag = false;
break;
default:
Console.WriteLine("Invalid menu item, enter numbers 1-4");
Console.WriteLine("\nPress any key...");
Console.ReadLine();
break;
}
}
}
/// <summary>
/// Deletes the given key from the tree, if present.
/// </summary>
/// <param name="key"></param>
/// <returns>True if the depth of the tree decreased.</returns>
public bool Delete(int key)
{
if (this.isHead)
{
// empty tree
if (this.rightChild == null)
{
return(false);
}
// delete recursively from the tree
else
{
return(this.rightChild.Delete(key));
}
}
// recursively try to find and delete the key
switch (key.CompareTo(this.key))
{
// look in the right subtree
case 1:
{
// key is not in the tree, do nothing
if (rightChild == null)
{
break;
}
// delete the key from the right subtree
bool depthDecreased = rightChild.Delete(key);
// check balance
if (depthDecreased)
{
switch (this.balance)
{
// the node is being balanced, but the depth decreases -> send the information to the upper levels
case 1:
{
balance--;
return(true);
}
// node is being unbalanced to the left, the depth does NOT decrease
case 0:
{
balance--;
return(false);
}
// node is already unbalanced to the left, now double unbalanced -> need to rotate
case -1:
{
balance--;
switch (leftChild.balance)
{
// rotate right, depth decreases
case -1:
{
RotateRight(this);
return(true);
}
// rotate right, depth does NOT decrease
case 0:
{
RotateRight(this);
return(false);
}
// double rotate, depth decreases
case 1:
{
RotateLeft(this.leftChild);
RotateRight(this);
return(true);
}
default:
return(false);
}
}
default:
break;
}
}
break;
}
// look in the right subtree
case -1:
{
// key is not in the tree, do nothing
if (leftChild == null)
{
break;
}
// delete the key from the left subtree
bool depthDecreased = leftChild.Delete(key);
// check balance
if (depthDecreased)
{
switch (this.balance)
{
// the node is being balanced, but the depth decreases -> send the information to the upper levels
case -1:
{
balance++;
return(true);
}
// node is being unbalanced to the right, the depth does NOT decrease
case 0:
{
balance++;
return(false);
}
// node is already unbalanced to the right, now double unbalanced -> need to rotate
case 1:
{
balance++;
switch (rightChild.balance)
{
// rotate left, depth decreases
case 1:
{
RotateLeft(this);
return(true);
}
// rotate left, depth does NOT decrease
case 0:
{
RotateLeft(this);
return(false);
}
// double rotate, depth decreases
case -1:
{
RotateRight(this.rightChild);
RotateLeft(this);
return(true);
}
default:
return(false);
}
}
default:
break;
}
}
break;
}
// we have found the key, now we will delete it
case 0:
{
// node is leaf, simply delete
if ((this.rightChild == null) && (this.leftChild == null))
{
if (this.key < parent.key)
{
parent.leftChild = null;
}
else
{
parent.rightChild = null;
}
return(true);
}
// node has only a left child, just reconnect it
else if (this.rightChild == null)
{
if (this.key < parent.key)
{
parent.leftChild = this.leftChild;
this.leftChild.parent = this.parent;
}
else
{
parent.rightChild = this.leftChild;
this.leftChild.parent = this.parent;
}
return(true);
}
// node has only a right child, just reconnect it
else if (this.leftChild == null)
{
if (this.key < parent.key)
{
parent.leftChild = this.rightChild;
this.rightChild.parent = this.parent;
}
else
{
parent.rightChild = this.rightChild;
this.rightChild.parent = this.parent;
}
return(true);
}
// node has both children, replace it with a node from the subtree
else
{
int replacementKey;
// choose the replacement in the deeper subtree (avoid disbalancing)
if (this.balance == -1)
{
replacementKey = leftChild.findMaxKey();
}
else
{
replacementKey = rightChild.findMinKey();
}
// delete the replacement key (it has surely atmost one child)
bool depthDecreased = this.Delete(replacementKey);
// replace the key in this node by the key of the deleted replacement
this.key = replacementKey;
// deleting in the subtree might change depth, propagate
return(depthDecreased);
}
}
default:
break;
}
return(false);
}
/// <summary>
/// Inserts the given key into the tree.
/// </summary>
/// <param name="key"></param>
/// <returns>True if the depth of the tree increased.</returns>
public bool Insert(int key)
{
// empty node, simply fill with key
if (this.containsKey == false)
{
this.key = key;
this.containsKey = true;
// depth increased
return(true);
}
// non-empty node, insert to the correct subtree
else
{
switch (key.CompareTo(this.key))
{
// insert to the right subtree
case 1:
{
// create right child if nonexistent
if (rightChild == null)
{
rightChild = new AVLTree(this);
}
// insert the key to the left subtree
bool depthIncreased = rightChild.Insert(key);
// check balance
if (depthIncreased)
{
// head does not need to be balanced
if (this.isHead == true)
{
break;
}
switch (this.balance)
{
// right subtree was deeper, now increased by another level -> rotation necessary
case 1:
{
this.balance++;
// single left rotation
if (this.rightChild.balance == 1)
{
RotateLeft(this);
}
// double rotation
else if (this.rightChild.balance == -1)
{
RotateRight(this.rightChild);
RotateLeft(this);
}
// balance of the right child cannot be 0, the depth would not increase in such case
// tree has been balanced and the depth change does not propagate any further
return(false);
}
case 0:
{
// right child was balanced, now it will be unbalanced by one (still OK) - propagate the information about depth increase to the upper levels
this.balance++;
return(true);
}
case -1:
{
// right child was unbalanced to the left, now it will be balanced and the depth will stay the same
this.balance++;
return(false);
}
default:
break;
}
}
break;
}
// insert to the left subtree (mirror situation)
case -1:
{
// create right child if nonexistent
if (leftChild == null)
{
leftChild = new AVLTree(this);
}
// insert the key to the left subtree
if (leftChild.Insert(key))
{
// head does not need to be balanced
if (this.isHead == true)
{
break;
}
switch (this.balance)
{
// left subtree was deeper, now increased by another level -> rotation necessary
case -1:
{
this.balance--;
// single right rotation
if (this.leftChild.balance == -1)
{
RotateRight(this);
}
// double rotation
else if (this.leftChild.balance == 1)
{
RotateLeft(this.leftChild);
RotateRight(this);
}
// balance of the left child cannot be 0, the depth would not increase in such case
// tree has been balanced and the depth change does not propagate any further
return(false);
}
case 0:
{
// left child was balanced, now it will be unbalanced by one (still OK) - propagate the information about depth increase to the upper levels
this.balance--;
return(true);
}
case 1:
{
// left child was unbalanced to the right, now it will be balanced and the depth will stay the same
this.balance--;
return(false);
}
default:
break;
}
}
break;
}
// key is already in the tree, do nothing
case 0:
break;
default:
break;
}
}
return(false);
}
