Find kth node in diagonal traversal of binary tree

Here given code implementation process.

/*
    Java program
    Find kth node in diagonal traversal of binary tree
*/
// Binary Tree node
class TreeNode
{
	public int data;
	public TreeNode left;
	public TreeNode right;
	public TreeNode(int data)
	{
		// Set node value
		this.data = data;
		this.left = null;
		this.right = null;
	}
}
class QNode
{
	public TreeNode data;
	public QNode next;
	public QNode(TreeNode data)
	{
		this.data = data;
		this.next = null;
	}
}
// Define custom queue class
class MyQueue
{
	public QNode front;
	public QNode rear;
	public int size;
	public MyQueue()
	{
		this.front = null;
		this.rear = null;
		this.size = 0;
	}
	// Add a new node at last of queue
	public void enqueue(TreeNode data)
	{
		QNode node = new QNode(data);
		if (this.front == null)
		{
			// When first node of queue
			this.front = node;
		}
		else
		{
			// Add node at last level
			this.rear.next = node;
		}
		this.size++;
		this.rear = node;
	}
	// Delete front node of queue
	public void dequeue()
	{
		if (this.front != null)
		{
			if (this.rear == this.front)
			{
				this.rear = null;
				this.front = null;
			}
			else
			{
				this.front = this.front.next;
			}
			this.size--;
		}
	}
	public int isSize()
	{
		return this.size;
	}
	public boolean isEmpty()
	{
		if (this.isSize() == 0)
		{
			return true;
		}
		return false;
	}
	public QNode peek()
	{
		if (this.isSize() == 0)
		{
			return null;
		}
		else
		{
			return this.front;
		}
	}
}
public class BinaryTree
{
	public TreeNode root;
	public BinaryTree()
	{
		// Set initial value
		this.root = null;
	}
	public void findKthDiagonal(int k)
	{
		if (k <= 0)
		{
			System.out.print("\n Invalid k " + k);
			return;
		}
		if (this.root == null)
		{
			System.out.print("Empty Tree\n");
			return;
		}
		int count = 0;
		TreeNode temp = null;
		TreeNode result = null;
		// Empty Queue
		MyQueue record = new MyQueue();
		// Add first element
		record.enqueue(this.root);
		while (record.isEmpty() == false)
		{
			// Collect Tree node
			temp = record.peek().data;
			while (temp != null && result == null)
			{
				count++;
				if (temp.left != null)
				{
					record.enqueue(temp.left);
				}
				if (count == k)
				{
					result = temp;
				}
				// Visit to right child
				temp = temp.right;
			}
			// Remove front node
			record.dequeue();
		}
		if (result == null)
		{
			System.out.print("\n " + k + 
                             "th diagonal element are not exist\n");
		}
		else
		{
			System.out.println("\n " + k + 
                               "th diagonal element is : " + 
                               (result.data));
		}
	}
	public static void main(String[] args)
	{
		BinaryTree tree = new BinaryTree();
		/*
		         1
		       /   \
		     -8    13
		     / \   / \
		    3  11 16  5
		       /   \   \
		     -7     4   2
		     /     / \
		    9     1  -2  
		         /     \
		       -5       12
		       /       /
		      6       14
		-----------------------
		    Binary Tree
		-----------------------
		*/
		tree.root = new TreeNode(1);
		tree.root.left = new TreeNode(-8);
		tree.root.right = new TreeNode(13);
		tree.root.left.left = new TreeNode(3);
		tree.root.left.right = new TreeNode(11);
		tree.root.left.right.left = new TreeNode(-7);
		tree.root.left.right.left.left = new TreeNode(9);
		tree.root.right.left = new TreeNode(16);
		tree.root.right.right = new TreeNode(5);
		tree.root.right.left.right = new TreeNode(4);
		tree.root.right.right.right = new TreeNode(2);
		tree.root.right.left.right.left = new TreeNode(1);
		tree.root.right.left.right.right = new TreeNode(-2);
		tree.root.right.left.right.right.right = new TreeNode(12);
		tree.root.right.left.right.left.left = new TreeNode(-5);
		tree.root.right.left.right.left.left.left = new TreeNode(6);
		tree.root.right.left.right.right.right.left = new TreeNode(14);
		// Test
		// Diagonal traversal
		// [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
		// k = 3
		// Result = 5
		tree.findKthDiagonal(3);
		// k = 7
		// Result = 16
		tree.findKthDiagonal(7);
		// k = 19
		// Result = None
		tree.findKthDiagonal(19);
		// k = 13
		// Result = 1
		tree.findKthDiagonal(13);
	}
}

Output

 3th diagonal element is : 5

 7th diagonal element is : 16

 19th diagonal element are not exist

 13th diagonal element is : 1
// Include header file
#include <iostream>

using namespace std;
/*
    C++ program
    Find kth node in diagonal traversal of binary tree
*/
// Binary Tree node
class TreeNode
{
	public: int data;
	TreeNode *left;
	TreeNode *right;
	TreeNode(int data)
	{
		// Set node value
		this->data = data;
		this->left = NULL;
		this->right = NULL;
	}
};
class QNode
{
	public: TreeNode *data;
	QNode *next;
	QNode(TreeNode *data)
	{
		this->data = data;
		this->next = NULL;
	}
};
// Define custom queue class
class MyQueue
{
	public: QNode *front;
	QNode *rear;
	int size;
	MyQueue()
	{
		this->front = NULL;
		this->rear = NULL;
		this->size = 0;
	}
	// Add a new node at last of queue
	void enqueue(TreeNode *data)
	{
		QNode *node = new QNode(data);
		if (this->front == NULL)
		{
			// When first node of queue
			this->front = node;
		}
		else
		{
			// Add node at last level
			this->rear->next = node;
		}
		this->size++;
		this->rear = node;
	}
	// Delete front node of queue
	void dequeue()
	{
		if (this->front != NULL)
		{
			if (this->rear == this->front)
			{
				this->rear = NULL;
				this->front = NULL;
			}
			else
			{
				this->front = this->front->next;
			}
			this->size--;
		}
	}
	int isSize()
	{
		return this->size;
	}
	bool isEmpty()
	{
		if (this->isSize() == 0)
		{
			return true;
		}
		return false;
	}
	QNode *peek()
	{
		if (this->isSize() == 0)
		{
			return NULL;
		}
		else
		{
			return this->front;
		}
	}
};
class BinaryTree
{
	public: TreeNode *root;
	BinaryTree()
	{
		this->root = NULL;
	}
	void findKthDiagonal(int k)
	{
		if (k <= 0)
		{
			cout << "\n Invalid k " << k;
			return;
		}
		if (this->root == NULL)
		{
			cout << "Empty Tree\n";
			return;
		}
		int count = 0;
		TreeNode *temp = NULL;
		TreeNode *result = NULL;
		// Empty Queue
		MyQueue *record = new MyQueue();
		// Add first element
		record->enqueue(this->root);
		while (record->isEmpty() == false)
		{
			// Collect Tree node
			temp = record->peek()->data;
			while (temp != NULL && result == NULL)
			{
				count++;
				if (temp->left != NULL)
				{
					record->enqueue(temp->left);
				}
				if (count == k)
				{
					result = temp;
				}
				// Visit to right child
				temp = temp->right;
			}
			// Remove front node
			record->dequeue();
		}
		if (result == NULL)
		{
			cout << "\n " << k 
                 << "th diagonal element are not exist\n";
		}
		else
		{
			cout << "\n " << k 
                 << "th diagonal element is : " 
                 << (result->data) << endl;
		}
	}
};
int main()
{
	BinaryTree *tree = new BinaryTree();
	/*
	         1
	       /   \
	     -8    13
	     / \   / \
	    3  11 16  5
	       /   \   \
	     -7     4   2
	     /     / \
	    9     1  -2  
	         /     \
	       -5       12
	       /       /
	      6       14
	-----------------------
	    Binary Tree
	-----------------------
	*/
	tree->root = new TreeNode(1);
	tree->root->left = new TreeNode(-8);
	tree->root->right = new TreeNode(13);
	tree->root->left->left = new TreeNode(3);
	tree->root->left->right = new TreeNode(11);
	tree->root->left->right->left = new TreeNode(-7);
	tree->root->left->right->left->left = new TreeNode(9);
	tree->root->right->left = new TreeNode(16);
	tree->root->right->right = new TreeNode(5);
	tree->root->right->left->right = new TreeNode(4);
	tree->root->right->right->right = new TreeNode(2);
	tree->root->right->left->right->left = new TreeNode(1);
	tree->root->right->left->right->right = new TreeNode(-2);
	tree->root->right->left->right->right->right = new TreeNode(12);
	tree->root->right->left->right->left->left = new TreeNode(-5);
	tree->root->right->left->right->left->left->left = new TreeNode(6);
	tree->root->right->left->right->right->right->left = new TreeNode(14);
	// Test
	// Diagonal traversal
	// [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
	// k = 3
	// Result = 5
	tree->findKthDiagonal(3);
	// k = 7
	// Result = 16
	tree->findKthDiagonal(7);
	// k = 19
	// Result = None
	tree->findKthDiagonal(19);
	// k = 13
	// Result = 1
	tree->findKthDiagonal(13);
	return 0;
}

Output

 3th diagonal element is : 5

 7th diagonal element is : 16

 19th diagonal element are not exist

 13th diagonal element is : 1
// Include namespace system
using System;
/*
    Csharp program
    Find kth node in diagonal traversal of binary tree
*/
// Binary Tree node
public class TreeNode
{
	public int data;
	public TreeNode left;
	public TreeNode right;
	public TreeNode(int data)
	{
		// Set node value
		this.data = data;
		this.left = null;
		this.right = null;
	}
}
public class QNode
{
	public TreeNode data;
	public QNode next;
	public QNode(TreeNode data)
	{
		this.data = data;
		this.next = null;
	}
}
// Define custom queue class
public class MyQueue
{
	public QNode front;
	public QNode rear;
	public int size;
	public MyQueue()
	{
		this.front = null;
		this.rear = null;
		this.size = 0;
	}
	// Add a new node at last of queue
	public void enqueue(TreeNode data)
	{
		QNode node = new QNode(data);
		if (this.front == null)
		{
			// When first node of queue
			this.front = node;
		}
		else
		{
			// Add node at last level
			this.rear.next = node;
		}
		this.size++;
		this.rear = node;
	}
	// Delete front node of queue
	public void dequeue()
	{
		if (this.front != null)
		{
			if (this.rear == this.front)
			{
				this.rear = null;
				this.front = null;
			}
			else
			{
				this.front = this.front.next;
			}
			this.size--;
		}
	}
	public int isSize()
	{
		return this.size;
	}
	public Boolean isEmpty()
	{
		if (this.isSize() == 0)
		{
			return true;
		}
		return false;
	}
	public QNode peek()
	{
		if (this.isSize() == 0)
		{
			return null;
		}
		else
		{
			return this.front;
		}
	}
}
public class BinaryTree
{
	public TreeNode root;
	public BinaryTree()
	{
		// Set initial value
		this.root = null;
	}
	public void findKthDiagonal(int k)
	{
		if (k <= 0)
		{
			Console.Write("\n Invalid k " + k);
			return;
		}
		if (this.root == null)
		{
			Console.Write("Empty Tree\n");
			return;
		}
		int count = 0;
		TreeNode temp = null;
		TreeNode result = null;
		// Empty Queue
		MyQueue record = new MyQueue();
		// Add first element
		record.enqueue(this.root);
		while (record.isEmpty() == false)
		{
			// Collect Tree node
			temp = record.peek().data;
			while (temp != null && result == null)
			{
				count++;
				if (temp.left != null)
				{
					record.enqueue(temp.left);
				}
				if (count == k)
				{
					result = temp;
				}
				// Visit to right child
				temp = temp.right;
			}
			// Remove front node
			record.dequeue();
		}
		if (result == null)
		{
			Console.Write("\n " + k + 
                          "th diagonal element are not exist\n");
		}
		else
		{
			Console.WriteLine("\n " + k + 
                              "th diagonal element is : " + 
                              (result.data));
		}
	}
	public static void Main(String[] args)
	{
		BinaryTree tree = new BinaryTree();
		/*
		         1
		       /   \
		     -8    13
		     / \   / \
		    3  11 16  5
		       /   \   \
		     -7     4   2
		     /     / \
		    9     1  -2  
		         /     \
		       -5       12
		       /       /
		      6       14
		-----------------------
		    Binary Tree
		-----------------------
		*/
		tree.root = new TreeNode(1);
		tree.root.left = new TreeNode(-8);
		tree.root.right = new TreeNode(13);
		tree.root.left.left = new TreeNode(3);
		tree.root.left.right = new TreeNode(11);
		tree.root.left.right.left = new TreeNode(-7);
		tree.root.left.right.left.left = new TreeNode(9);
		tree.root.right.left = new TreeNode(16);
		tree.root.right.right = new TreeNode(5);
		tree.root.right.left.right = new TreeNode(4);
		tree.root.right.right.right = new TreeNode(2);
		tree.root.right.left.right.left = new TreeNode(1);
		tree.root.right.left.right.right = new TreeNode(-2);
		tree.root.right.left.right.right.right = new TreeNode(12);
		tree.root.right.left.right.left.left = new TreeNode(-5);
		tree.root.right.left.right.left.left.left = new TreeNode(6);
		tree.root.right.left.right.right.right.left = new TreeNode(14);
		// Test
		// Diagonal traversal
		// [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
		// k = 3
		// Result = 5
		tree.findKthDiagonal(3);
		// k = 7
		// Result = 16
		tree.findKthDiagonal(7);
		// k = 19
		// Result = None
		tree.findKthDiagonal(19);
		// k = 13
		// Result = 1
		tree.findKthDiagonal(13);
	}
}

Output

 3th diagonal element is : 5

 7th diagonal element is : 16

 19th diagonal element are not exist

 13th diagonal element is : 1
package main
import "fmt"
/*
    Go program
    Find kth node in diagonal traversal of binary tree
*/
// Binary Tree node
type TreeNode struct {
	data int
	left * TreeNode
	right * TreeNode
}
func getTreeNode(data int) * TreeNode {
	var me *TreeNode = &TreeNode {}
	// Set node value
	me.data = data
	me.left = nil
	me.right = nil
	return me
}
type QNode struct {
	data * TreeNode
	next * QNode
}
func getQNode(data * TreeNode) * QNode {
	var me *QNode = &QNode {}
	me.data = data
	me.next = nil
	return me
}
// Define custom queue class
type MyQueue struct {
	front * QNode
	rear * QNode
	size int
}
func getMyQueue() * MyQueue {
	var me *MyQueue = &MyQueue {}
	me.front = nil
	me.rear = nil
	me.size = 0
	return me
}
// Add a new node at last of queue
func(this *MyQueue) enqueue(data * TreeNode) {
	var node * QNode = getQNode(data)
	if this.front == nil {
		// When first node of queue
		this.front = node
	} else {
		// Add node at last level
		this.rear.next = node
	}
	this.size++
	this.rear = node
}
// Delete front node of queue
func(this *MyQueue) dequeue() {
	if this.front != nil {
		if this.rear == this.front {
			this.rear = nil
			this.front = nil
		} else {
			this.front = this.front.next
		}
		this.size--
	}
}
func(this MyQueue) isSize() int {
	return this.size
}
func(this MyQueue) isEmpty() bool {
	if this.isSize() == 0 {
		return true
	}
	return false
}
func(this MyQueue) peek() * QNode {
	if this.isSize() == 0 {
		return nil
	} else {
		return this.front
	}
}
type BinaryTree struct {
	root * TreeNode
}
func getBinaryTree() * BinaryTree {
	var me *BinaryTree = &BinaryTree {}
	// Set initial value
	me.root = nil
	return me
}
func(this BinaryTree) findKthDiagonal(k int) {
	if k <= 0 {
		fmt.Print("\n Invalid k ", k)
		return
	}
	if this.root == nil {
		fmt.Print("Empty Tree\n")
		return
	}
	var count int = 0
	var temp * TreeNode = nil
	var result * TreeNode = nil
	// Empty Queue
	var record * MyQueue = getMyQueue()
	// Add first element
	record.enqueue(this.root)
	for (record.isEmpty() == false) {
		// Collect Tree node
		temp = record.peek().data
		for (temp != nil && result == nil) {
			count++
			if temp.left != nil {
				record.enqueue(temp.left)
			}
			if count == k {
				result = temp
			}
			// Visit to right child
			temp = temp.right
		}
		// Remove front node
		record.dequeue()
	}
	if result == nil {
		fmt.Print("\n ", k, 
			"th diagonal element are not exist\n")
	} else {
		fmt.Println("\n ", k, 
			"th diagonal element is : ", (result.data))
	}
}
func main() {
	var tree * BinaryTree = getBinaryTree()
	/*
	         1
	       /   \
	     -8    13
	     / \   / \
	    3  11 16  5
	       /   \   \
	     -7     4   2
	     /     / \
	    9     1  -2  
	         /     \
	       -5       12
	       /       /
	      6       14
	-----------------------
	    Binary Tree
	-----------------------
	*/
	tree.root = getTreeNode(1)
	tree.root.left = getTreeNode(-8)
	tree.root.right = getTreeNode(13)
	tree.root.left.left = getTreeNode(3)
	tree.root.left.right = getTreeNode(11)
	tree.root.left.right.left = getTreeNode(-7)
	tree.root.left.right.left.left = getTreeNode(9)
	tree.root.right.left = getTreeNode(16)
	tree.root.right.right = getTreeNode(5)
	tree.root.right.left.right = getTreeNode(4)
	tree.root.right.right.right = getTreeNode(2)
	tree.root.right.left.right.left = getTreeNode(1)
	tree.root.right.left.right.right = getTreeNode(-2)
	tree.root.right.left.right.right.right = getTreeNode(12)
	tree.root.right.left.right.left.left = getTreeNode(-5)
	tree.root.right.left.right.left.left.left = getTreeNode(6)
	tree.root.right.left.right.right.right.left = getTreeNode(14)
	// Test
	// Diagonal traversal
	// [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
	// k = 3
	// Result = 5
	tree.findKthDiagonal(3)
	// k = 7
	// Result = 16
	tree.findKthDiagonal(7)
	// k = 19
	// Result = None
	tree.findKthDiagonal(19)
	// k = 13
	// Result = 1
	tree.findKthDiagonal(13)
}

Output

 3 th diagonal element is : 5

 7 th diagonal element is : 16

 19 th diagonal element are not exist

 13 th diagonal element is : 1
<?php
/*
    Php program
    Find kth node in diagonal traversal of binary tree
*/
// Binary Tree node
class TreeNode
{
	public $data;
	public $left;
	public $right;
	public	function __construct($data)
	{
		// Set node value
		$this->data = $data;
		$this->left = NULL;
		$this->right = NULL;
	}
}
class QNode
{
	public $data;
	public $next;
	public	function __construct($data)
	{
		$this->data = $data;
		$this->next = NULL;
	}
}
// Define custom queue class
class MyQueue
{
	public $front;
	public $rear;
	public $size;
	public	function __construct()
	{
		$this->front = NULL;
		$this->rear = NULL;
		$this->size = 0;
	}
	// Add a new node at last of queue
	public	function enqueue($data)
	{
		$node = new QNode($data);
		if ($this->front == NULL)
		{
			// When first node of queue
			$this->front = $node;
		}
		else
		{
			// Add node at last level
			$this->rear->next = $node;
		}
		$this->size++;
		$this->rear = $node;
	}
	// Delete front node of queue
	public	function dequeue()
	{
		if ($this->front != NULL)
		{
			if ($this->rear == $this->front)
			{
				$this->rear = NULL;
				$this->front = NULL;
			}
			else
			{
				$this->front = $this->front->next;
			}
			$this->size--;
		}
	}
	public	function isSize()
	{
		return $this->size;
	}
	public	function isEmpty()
	{
		if ($this->isSize() == 0)
		{
			return true;
		}
		return false;
	}
	public	function peek()
	{
		if ($this->isSize() == 0)
		{
			return NULL;
		}
		else
		{
			return $this->front;
		}
	}
}
class BinaryTree
{
	public $root;
	public	function __construct()
	{
		$this->root = NULL;
	}
	public	function findKthDiagonal($k)
	{
		if ($k <= 0)
		{
			echo("\n Invalid k ".$k);
			return;
		}
		if ($this->root == NULL)
		{
			echo("Empty Tree\n");
			return;
		}
		$count = 0;
		$temp = NULL;
		$result = NULL;
		// Empty Queue
		$record = new MyQueue();
		// Add first element
		$record->enqueue($this->root);
		while ($record->isEmpty() == false)
		{
			// Collect Tree node
			$temp = $record->peek()->data;
			while ($temp != NULL && $result == NULL)
			{
				$count++;
				if ($temp->left != NULL)
				{
					$record->enqueue($temp->left);
				}
				if ($count == $k)
				{
					$result = $temp;
				}
				// Visit to right child
				$temp = $temp->right;
			}
			// Remove front node
			$record->dequeue();
		}
		if ($result == NULL)
		{
			echo("\n ".$k.
				"th diagonal element are not exist\n");
		}
		else
		{
			echo("\n ".$k.
				"th diagonal element is : ".($result->data).
				"\n");
		}
	}
}

function main()
{
	$tree = new BinaryTree();
	/*
	         1
	       /   \
	     -8    13
	     / \   / \
	    3  11 16  5
	       /   \   \
	     -7     4   2
	     /     / \
	    9     1  -2  
	         /     \
	       -5       12
	       /       /
	      6       14
	-----------------------
	    Binary Tree
	-----------------------
	*/
	$tree->root = new TreeNode(1);
	$tree->root->left = new TreeNode(-8);
	$tree->root->right = new TreeNode(13);
	$tree->root->left->left = new TreeNode(3);
	$tree->root->left->right = new TreeNode(11);
	$tree->root->left->right->left = new TreeNode(-7);
	$tree->root->left->right->left->left = new TreeNode(9);
	$tree->root->right->left = new TreeNode(16);
	$tree->root->right->right = new TreeNode(5);
	$tree->root->right->left->right = new TreeNode(4);
	$tree->root->right->right->right = new TreeNode(2);
	$tree->root->right->left->right->left = new TreeNode(1);
	$tree->root->right->left->right->right = new TreeNode(-2);
	$tree->root->right->left->right->right->right = new TreeNode(12);
	$tree->root->right->left->right->left->left = new TreeNode(-5);
	$tree->root->right->left->right->left->left->left = new TreeNode(6);
	$tree->root->right->left->right->right->right->left = new TreeNode(14);
	// Test
	// Diagonal traversal
	// [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
	// k = 3
	// Result = 5
	$tree->findKthDiagonal(3);
	// k = 7
	// Result = 16
	$tree->findKthDiagonal(7);
	// k = 19
	// Result = None
	$tree->findKthDiagonal(19);
	// k = 13
	// Result = 1
	$tree->findKthDiagonal(13);
}
main();

Output

 3th diagonal element is : 5

 7th diagonal element is : 16

 19th diagonal element are not exist

 13th diagonal element is : 1
/*
    Node JS program
    Find kth node in diagonal traversal of binary tree
*/
// Binary Tree node
class TreeNode
{
	constructor(data)
	{
		// Set node value
		this.data = data;
		this.left = null;
		this.right = null;
	}
}
class QNode
{
	constructor(data)
	{
		this.data = data;
		this.next = null;
	}
}
// Define custom queue class
class MyQueue
{
	constructor()
	{
		this.front = null;
		this.rear = null;
		this.size = 0;
	}
	// Add a new node at last of queue
	enqueue(data)
	{
		var node = new QNode(data);
		if (this.front == null)
		{
			// When first node of queue
			this.front = node;
		}
		else
		{
			// Add node at last level
			this.rear.next = node;
		}
		this.size++;
		this.rear = node;
	}
	// Delete front node of queue
	dequeue()
	{
		if (this.front != null)
		{
			if (this.rear == this.front)
			{
				this.rear = null;
				this.front = null;
			}
			else
			{
				this.front = this.front.next;
			}
			this.size--;
		}
	}
	isSize()
	{
		return this.size;
	}
	isEmpty()
	{
		if (this.isSize() == 0)
		{
			return true;
		}
		return false;
	}
	peek()
	{
		if (this.isSize() == 0)
		{
			return null;
		}
		else
		{
			return this.front;
		}
	}
}
class BinaryTree
{
	constructor()
	{
		this.root = null;
	}
	findKthDiagonal(k)
	{
		if (k <= 0)
		{
			process.stdout.write("\n Invalid k " + k);
			return;
		}
		if (this.root == null)
		{
			process.stdout.write("Empty Tree\n");
			return;
		}
		var count = 0;
		var temp = null;
		var result = null;
		// Empty Queue
		var record = new MyQueue();
		// Add first element
		record.enqueue(this.root);
		while (record.isEmpty() == false)
		{
			// Collect Tree node
			temp = record.peek().data;
			while (temp != null && result == null)
			{
				count++;
				if (temp.left != null)
				{
					record.enqueue(temp.left);
				}
				if (count == k)
				{
					result = temp;
				}
				// Visit to right child
				temp = temp.right;
			}
			// Remove front node
			record.dequeue();
		}
		if (result == null)
		{
			process.stdout.write("\n " + k + 
                                 "th diagonal element are not exist\n");
		}
		else
		{
			console.log("\n " + k + 
                        "th diagonal element is : " + 
                        (result.data));
		}
	}
}

function main()
{
	var tree = new BinaryTree();
	/*
	         1
	       /   \
	     -8    13
	     / \   / \
	    3  11 16  5
	       /   \   \
	     -7     4   2
	     /     / \
	    9     1  -2  
	         /     \
	       -5       12
	       /       /
	      6       14
	-----------------------
	    Binary Tree
	-----------------------
	*/
	tree.root = new TreeNode(1);
	tree.root.left = new TreeNode(-8);
	tree.root.right = new TreeNode(13);
	tree.root.left.left = new TreeNode(3);
	tree.root.left.right = new TreeNode(11);
	tree.root.left.right.left = new TreeNode(-7);
	tree.root.left.right.left.left = new TreeNode(9);
	tree.root.right.left = new TreeNode(16);
	tree.root.right.right = new TreeNode(5);
	tree.root.right.left.right = new TreeNode(4);
	tree.root.right.right.right = new TreeNode(2);
	tree.root.right.left.right.left = new TreeNode(1);
	tree.root.right.left.right.right = new TreeNode(-2);
	tree.root.right.left.right.right.right = new TreeNode(12);
	tree.root.right.left.right.left.left = new TreeNode(-5);
	tree.root.right.left.right.left.left.left = new TreeNode(6);
	tree.root.right.left.right.right.right.left = new TreeNode(14);
	// Test
	// Diagonal traversal
	// [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
	// k = 3
	// Result = 5
	tree.findKthDiagonal(3);
	// k = 7
	// Result = 16
	tree.findKthDiagonal(7);
	// k = 19
	// Result = None
	tree.findKthDiagonal(19);
	// k = 13
	// Result = 1
	tree.findKthDiagonal(13);
}
main();

Output

 3th diagonal element is : 5

 7th diagonal element is : 16

 19th diagonal element are not exist

 13th diagonal element is : 1
#    Python 3 program
#    Find kth node in diagonal traversal of binary tree

#  Binary Tree node
class TreeNode :
	def __init__(self, data) :
		#  Set node value
		self.data = data
		self.left = None
		self.right = None
	

class QNode :
	def __init__(self, data) :
		self.data = data
		self.next = None
	

#  Define custom queue class
class MyQueue :
	def __init__(self) :
		self.front = None
		self.rear = None
		self.size = 0
	
	#  Add a new node at last of queue
	def enqueue(self, data) :
		node = QNode(data)
		if (self.front == None) :
			#  When first node of queue
			self.front = node
		else :
			#  Add node at last level
			self.rear.next = node
		
		self.size += 1
		self.rear = node
	
	#  Delete front node of queue
	def dequeue(self) :
		if (self.front != None) :
			if (self.rear == self.front) :
				self.rear = None
				self.front = None
			else :
				self.front = self.front.next
			
			self.size -= 1
		
	
	def isSize(self) :
		return self.size
	
	def isEmpty(self) :
		if (self.isSize() == 0) :
			return True
		
		return False
	
	def peek(self) :
		if (self.isSize() == 0) :
			return None
		else :
			return self.front
		
	

class BinaryTree :
	def __init__(self) :
		self.root = None
	
	def findKthDiagonal(self, k) :
		if (k <= 0) :
			print("\n Invalid k ", k, end = "")
			return
		
		if (self.root == None) :
			print("Empty Tree")
			return
		
		count = 0
		temp = None
		result = None
		#  Empty Queue
		record = MyQueue()
		#  Add first element
		record.enqueue(self.root)
		while (record.isEmpty() == False) :
			#  Collect Tree node
			temp = record.peek().data
			while (temp != None and result == None) :
				count += 1
				if (temp.left != None) :
					record.enqueue(temp.left)
				
				if (count == k) :
					result = temp
				
				#  Visit to right child
				temp = temp.right
			
			#  Remove front node
			record.dequeue()
		
		if (result == None) :
			print("\n ", k ,"th diagonal element are not exist")
		else :
			print("\n ", k ,"th diagonal element is : ", (result.data))
		
	

def main() :
	tree = BinaryTree()
	#         1
	#       /   \
	#     -8    13
	#     / \   / \
	#    3  11 16  5
	#       /   \   \
	#     -7     4   2
	#     /     / \
	#    9     1  -2  
	#         /     \
	#       -5       12
	#       /       /
	#      6       14
	# -----------------------
	#    Binary Tree
	# -----------------------
	tree.root = TreeNode(1)
	tree.root.left = TreeNode(-8)
	tree.root.right = TreeNode(13)
	tree.root.left.left = TreeNode(3)
	tree.root.left.right = TreeNode(11)
	tree.root.left.right.left = TreeNode(-7)
	tree.root.left.right.left.left = TreeNode(9)
	tree.root.right.left = TreeNode(16)
	tree.root.right.right = TreeNode(5)
	tree.root.right.left.right = TreeNode(4)
	tree.root.right.right.right = TreeNode(2)
	tree.root.right.left.right.left = TreeNode(1)
	tree.root.right.left.right.right = TreeNode(-2)
	tree.root.right.left.right.right.right = TreeNode(12)
	tree.root.right.left.right.left.left = TreeNode(-5)
	tree.root.right.left.right.left.left.left = TreeNode(6)
	tree.root.right.left.right.right.right.left = TreeNode(14)
	#  Test
	#  Diagonal traversal
	#  [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
	#  k = 3
	#  Result = 5
	tree.findKthDiagonal(3)
	#  k = 7
	#  Result = 16
	tree.findKthDiagonal(7)
	#  k = 19
	#  Result = None
	tree.findKthDiagonal(19)
	#  k = 13
	#  Result = 1
	tree.findKthDiagonal(13)

if __name__ == "__main__": main()

Output

  3 th diagonal element is :  5

  7 th diagonal element is :  16

  19 th diagonal element are not exist

  13 th diagonal element is :  1
#    Ruby program
#    Find kth node in diagonal traversal of binary tree

#  Binary Tree node
class TreeNode 
	# Define the accessor and reader of class TreeNode
	attr_reader :data, :left, :right
	attr_accessor :data, :left, :right
	def initialize(data) 
		#  Set node value
		self.data = data
		self.left = nil
		self.right = nil
	end

end

class QNode 
	# Define the accessor and reader of class QNode
	attr_reader :data, :next
	attr_accessor :data, :next
	def initialize(data) 
		self.data = data
		self.next = nil
	end

end

#  Define custom queue class
class MyQueue 
	# Define the accessor and reader of class MyQueue
	attr_reader :front, :rear, :size
	attr_accessor :front, :rear, :size
	def initialize() 
		self.front = nil
		self.rear = nil
		self.size = 0
	end

	#  Add a new node at last of queue
	def enqueue(data) 
		node = QNode.new(data)
		if (self.front == nil) 
			#  When first node of queue
			self.front = node
		else
 
			#  Add node at last level
			self.rear.next = node
		end

		self.size += 1
		self.rear = node
	end

	#  Delete front node of queue
	def dequeue() 
		if (self.front != nil) 
			if (self.rear == self.front) 
				self.rear = nil
				self.front = nil
			else
 
				self.front = self.front.next
			end

			self.size -= 1
		end

	end

	def isSize() 
		return self.size
	end

	def isEmpty() 
		if (self.isSize() == 0) 
			return true
		end

		return false
	end

	def peek() 
		if (self.isSize() == 0) 
			return nil
		else
 
			return self.front
		end

	end

end

class BinaryTree 
	# Define the accessor and reader of class BinaryTree
	attr_reader :root
	attr_accessor :root
	def initialize() 
		self.root = nil
	end

	def findKthDiagonal(k) 
		if (k <= 0) 
			print("\n Invalid k ", k)
			return
		end

		if (self.root == nil) 
			print("Empty Tree\n")
			return
		end

		count = 0
		temp = nil
		result = nil
		#  Empty Queue
		record = MyQueue.new()
		#  Add first element
		record.enqueue(self.root)
		while (record.isEmpty() == false) 
			#  Collect Tree node
			temp = record.peek().data
			while (temp != nil && result == nil) 
				count += 1
				if (temp.left != nil) 
					record.enqueue(temp.left)
				end

				if (count == k) 
					result = temp
				end

				#  Visit to right child
				temp = temp.right
			end

			#  Remove front node
			record.dequeue()
		end

		if (result == nil) 
			print("\n ", k ,
                  "th diagonal element are not exist\n")
		else
 
			print("\n ", k ,
                  "th diagonal element is : ", 
                  (result.data), "\n")
		end

	end

end

def main() 
	tree = BinaryTree.new()
	#         1
	#       /   \
	#     -8    13
	#     / \   / \
	#    3  11 16  5
	#       /   \   \
	#     -7     4   2
	#     /     / \
	#    9     1  -2  
	#         /     \
	#       -5       12
	#       /       /
	#      6       14
	# -----------------------
	#    Binary Tree
	# -----------------------
	tree.root = TreeNode.new(1)
	tree.root.left = TreeNode.new(-8)
	tree.root.right = TreeNode.new(13)
	tree.root.left.left = TreeNode.new(3)
	tree.root.left.right = TreeNode.new(11)
	tree.root.left.right.left = TreeNode.new(-7)
	tree.root.left.right.left.left = TreeNode.new(9)
	tree.root.right.left = TreeNode.new(16)
	tree.root.right.right = TreeNode.new(5)
	tree.root.right.left.right = TreeNode.new(4)
	tree.root.right.right.right = TreeNode.new(2)
	tree.root.right.left.right.left = TreeNode.new(1)
	tree.root.right.left.right.right = TreeNode.new(-2)
	tree.root.right.left.right.right.right = TreeNode.new(12)
	tree.root.right.left.right.left.left = TreeNode.new(-5)
	tree.root.right.left.right.left.left.left = TreeNode.new(6)
	tree.root.right.left.right.right.right.left = TreeNode.new(14)
	#  Test
	#  Diagonal traversal
	#  [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
	#  k = 3
	#  Result = 5
	tree.findKthDiagonal(3)
	#  k = 7
	#  Result = 16
	tree.findKthDiagonal(7)
	#  k = 19
	#  Result = None
	tree.findKthDiagonal(19)
	#  k = 13
	#  Result = 1
	tree.findKthDiagonal(13)
end

main()

Output

 3th diagonal element is : 5

 7th diagonal element is : 16

 19th diagonal element are not exist

 13th diagonal element is : 1
/*
    Scala program
    Find kth node in diagonal traversal of binary tree
*/
// Binary Tree node
class TreeNode(var data: Int,
	var left: TreeNode,
		var right: TreeNode)
{
	def this(data: Int)
	{
		// Set node value
		this(data, null, null);
	}
}
class QNode(var data: TreeNode,
	var next: QNode)
{
	def this(data: TreeNode)
	{
		this(data, null);
	}
}
// Define custom queue class
class MyQueue(var front: QNode,
	var rear: QNode,
		var size: Int)
{
	def this()
	{
		this(null, null, 0);
	}
	// Add a new node at last of queue
	def enqueue(data: TreeNode): Unit = {
		var node: QNode = new QNode(data);
		if (this.front == null)
		{
			// When first node of queue
			this.front = node;
		}
		else
		{
			// Add node at last level
			this.rear.next = node;
		}
		this.size += 1;
		this.rear = node;
	}
	// Delete front node of queue
	def dequeue(): Unit = {
		if (this.front != null)
		{
			if (this.rear == this.front)
			{
				this.rear = null;
				this.front = null;
			}
			else
			{
				this.front = this.front.next;
			}
			this.size -= 1;
		}
	}
	def isSize(): Int = {
		return this.size;
	}
	def isEmpty(): Boolean = {
		if (this.isSize() == 0)
		{
			return true;
		}
		return false;
	}
	def peek(): QNode = {
		if (this.isSize() == 0)
		{
			return null;
		}
		else
		{
			return this.front;
		}
	}
}
class BinaryTree(var root: TreeNode)
{
	def this()
	{
		this(null);
	}
	def findKthDiagonal(k: Int): Unit = {
		if (k <= 0)
		{
			print("\n Invalid k " + k);
			return;
		}
		if (this.root == null)
		{
			print("Empty Tree\n");
			return;
		}
		var count: Int = 0;
		var temp: TreeNode = null;
		var result: TreeNode = null;
		// Empty Queue
		var record: MyQueue = new MyQueue();
		// Add first element
		record.enqueue(this.root);
		while (record.isEmpty() == false)
		{
			// Collect Tree node
			temp = record.peek().data;
			while (temp != null && result == null)
			{
				count += 1;
				if (temp.left != null)
				{
					record.enqueue(temp.left);
				}
				if (count == k)
				{
					result = temp;
				}
				// Visit to right child
				temp = temp.right;
			}
			// Remove front node
			record.dequeue();
		}
		if (result == null)
		{
			print("\n " + k + "th diagonal element are not exist\n");
		}
		else
		{
			println("\n " + k + 
                    "th diagonal element is : " + (result.data));
		}
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var tree: BinaryTree = new BinaryTree();
		/*
		         1
		       /   \
		     -8    13
		     / \   / \
		    3  11 16  5
		       /   \   \
		     -7     4   2
		     /     / \
		    9     1  -2  
		         /     \
		       -5       12
		       /       /
		      6       14
		-----------------------
		    Binary Tree
		-----------------------
		*/
		tree.root = new TreeNode(1);
		tree.root.left = new TreeNode(-8);
		tree.root.right = new TreeNode(13);
		tree.root.left.left = new TreeNode(3);
		tree.root.left.right = new TreeNode(11);
		tree.root.left.right.left = new TreeNode(-7);
		tree.root.left.right.left.left = new TreeNode(9);
		tree.root.right.left = new TreeNode(16);
		tree.root.right.right = new TreeNode(5);
		tree.root.right.left.right = new TreeNode(4);
		tree.root.right.right.right = new TreeNode(2);
		tree.root.right.left.right.left = new TreeNode(1);
		tree.root.right.left.right.right = new TreeNode(-2);
		tree.root.right.left.right.right.right = new TreeNode(12);
		tree.root.right.left.right.left.left = new TreeNode(-5);
		tree.root.right.left.right.left.left.left = new TreeNode(6);
		tree.root.right.left.right.right.right.left = new TreeNode(14);
		// Test
		// Diagonal traversal
		// [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
		// k = 3
		// Result = 5
		tree.findKthDiagonal(3);
		// k = 7
		// Result = 16
		tree.findKthDiagonal(7);
		// k = 19
		// Result = None
		tree.findKthDiagonal(19);
		// k = 13
		// Result = 1
		tree.findKthDiagonal(13);
	}
}

Output

 3th diagonal element is : 5

 7th diagonal element is : 16

 19th diagonal element are not exist

 13th diagonal element is : 1
/*
    Swift 4 program
    Find kth node in diagonal traversal of binary tree
*/
// Binary Tree node
class TreeNode
{
	var data: Int;
	var left: TreeNode? ;
	var right: TreeNode? ;
	init(_ data: Int)
	{
		// Set node value
		self.data = data;
		self.left = nil;
		self.right = nil;
	}
}
class QNode
{
	var data: TreeNode? ;
	var next: QNode? ;
	init(_ data: TreeNode? )
	{
		self.data = data;
		self.next = nil;
	}
}
// Define custom queue class
class MyQueue
{
	var front: QNode? ;
	var rear: QNode? ;
	var size: Int;
	init()
	{
		self.front = nil;
		self.rear = nil;
		self.size = 0;
	}
	// Add a new node at last of queue
	func enqueue(_ data: TreeNode? )
	{
		let node: QNode = QNode(data);
		if (self.front == nil)
		{
			// When first node of queue
			self.front = node;
		}
		else
		{
			// Add node at last level
			self.rear!.next = node;
		}
		self.size += 1;
		self.rear = node;
	}
	// Delete front node of queue
	func dequeue()
	{
		if (self.front  != nil)
		{
			if (self.rear === self.front)
			{
				self.rear = nil;
				self.front = nil;
			}
			else
			{
				self.front = self.front!.next;
			}
			self.size -= 1;
		}
	}
	func isSize() -> Int
	{
		return self.size;
	}
	func isEmpty() -> Bool
	{
		if (self.isSize() == 0)
		{
			return true;
		}
		return false;
	}
	func peek() -> QNode?
	{
		if (self.isSize() == 0)
		{
			return nil;
		}
		else
		{
			return self.front;
		}
	}
}
class BinaryTree
{
	var root: TreeNode? ;
	init()
	{
		self.root = nil;
	}
	func findKthDiagonal(_ k: Int)
	{
		if (k <= 0)
		{
			print("\n Invalid k ", k, terminator: "");
			return;
		}
		if (self.root == nil)
		{
			print("Empty Tree");
			return;
		}
		var count: Int = 0;
		var temp: TreeNode? = nil;
		var result: TreeNode? = nil;
		// Empty Queue
		let record: MyQueue = MyQueue();
		// Add first element
		record.enqueue(self.root);
		while (record.isEmpty() == false)
		{
			// Collect Tree node
			temp = record.peek()!.data;
			while (temp  != nil && result == nil)
			{
				count += 1;
				if (temp!.left  != nil)
				{
					record.enqueue(temp!.left);
				}
				if (count == k)
				{
					result = temp;
				}
				// Visit to right child
				temp = temp!.right;
			}
			// Remove front node
			record.dequeue();
		}
		if (result == nil)
		{
			print("\n ", k ,"th diagonal element are not exist");
		}
		else
		{
			print("\n ", k ,
                  "th diagonal element is : ", 
                  (result!.data));
		}
	}
}
func main()
{
	let tree: BinaryTree = BinaryTree();
	/*
	         1
	       /   \
	     -8    13
	     / \   / \
	    3  11 16  5
	       /   \   \
	     -7     4   2
	     /     / \
	    9     1  -2  
	         /     \
	       -5       12
	       /       /
	      6       14
	-----------------------
	    Binary Tree
	-----------------------
	*/
	tree.root = TreeNode(1);
	tree.root!.left = TreeNode(-8);
	tree.root!.right = TreeNode(13);
	tree.root!.left!.left = TreeNode(3);
	tree.root!.left!.right = TreeNode(11);
	tree.root!.left!.right!.left = TreeNode(-7);
	tree.root!.left!.right!.left!.left = TreeNode(9);
	tree.root!.right!.left = TreeNode(16);
	tree.root!.right!.right = TreeNode(5);
	tree.root!.right!.left!.right = TreeNode(4);
	tree.root!.right!.right!.right = TreeNode(2);
	tree.root!.right!.left!.right!.left = TreeNode(1);
	tree.root!.right!.left!.right!.right = TreeNode(-2);
	tree.root!.right!.left!.right!.right!.right = TreeNode(12);
	tree.root!.right!.left!.right!.left!.left = TreeNode(-5);
	tree.root!.right!.left!.right!.left!.left!.left = TreeNode(6);
	tree.root!.right!.left!.right!.right!.right!.left = TreeNode(14);
	// Test
	// Diagonal traversal
	// [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
	// k = 3
	// Result = 5
	tree.findKthDiagonal(3);
	// k = 7
	// Result = 16
	tree.findKthDiagonal(7);
	// k = 19
	// Result = None
	tree.findKthDiagonal(19);
	// k = 13
	// Result = 1
	tree.findKthDiagonal(13);
}
main();

Output

  3 th diagonal element is :  5

  7 th diagonal element is :  16

  19 th diagonal element are not exist

  13 th diagonal element is :  1
/*
    Kotlin program
    Find kth node in diagonal traversal of binary tree
*/
// Binary Tree node
class TreeNode
{
	var data: Int;
	var left: TreeNode ? ;
	var right: TreeNode ? ;
	constructor(data: Int)
	{
		// Set node value
		this.data = data;
		this.left = null;
		this.right = null;
	}
}
class QNode
{
	var data: TreeNode ? ;
	var next: QNode ? ;
	constructor(data: TreeNode ? )
	{
		this.data = data;
		this.next = null;
	}
}
// Define custom queue class
class MyQueue
{
	var front: QNode ? ;
	var rear: QNode ? ;
	var size: Int;
	constructor()
	{
		this.front = null;
		this.rear = null;
		this.size = 0;
	}
	// Add a new node at last of queue
	fun enqueue(data: TreeNode ? ): Unit
	{
		val node: QNode = QNode(data);
		if (this.front == null)
		{
			// When first node of queue
			this.front = node;
		}
		else
		{
			// Add node at last level
			this.rear?.next = node;
		}
		this.size += 1;
		this.rear = node;
	}
	// Delete front node of queue
	fun dequeue(): Unit
	{
		if (this.front != null)
		{
			if (this.rear == this.front)
			{
				this.rear = null;
				this.front = null;
			}
			else
			{
				this.front = this.front?.next;
			}
			this.size -= 1;
		}
	}
	fun isSize(): Int
	{
		return this.size;
	}
	fun isEmpty(): Boolean
	{
		if (this.isSize() == 0)
		{
			return true;
		}
		return false;
	}
	fun peek(): QNode ?
	{
		if (this.isSize() == 0)
		{
			return null;
		}
		else
		{
			return this.front;
		}
	}
}
class BinaryTree
{
	var root: TreeNode ? ;
	constructor()
	{
		this.root = null;
	}
	fun findKthDiagonal(k: Int): Unit
	{
		if (k <= 0)
		{
			print("\n Invalid k " + k);
			return;
		}
		if (this.root == null)
		{
			print("Empty Tree\n");
			return;
		}
		var count: Int = 0;
		var temp: TreeNode ?;
		var result: TreeNode ? = null;
		// Empty Queue
		val record: MyQueue = MyQueue();
		// Add first element
		record.enqueue(this.root);
		while (record.isEmpty() == false)
		{
			// Collect Tree node
			temp = record.peek()?.data;
			while (temp != null && result == null)
			{
				count += 1;
				if (temp.left != null)
				{
					record.enqueue(temp.left);
				}
				if (count == k)
				{
					result = temp;
				}
				// Visit to right child
				temp = temp.right;
			}
			// Remove front node
			record.dequeue();
		}
		if (result == null)
		{
			print("\n " + k + 
                  "th diagonal element are not exist\n");
		}
		else
		{
			println("\n " + k + 
                    "th diagonal element is : " + 
                    (result.data));
		}
	}
}
fun main(args: Array < String > ): Unit
{
	val tree: BinaryTree = BinaryTree();
	/*
	         1
	       /   \
	     -8    13
	     / \   / \
	    3  11 16  5
	       /   \   \
	     -7     4   2
	     /     / \
	    9     1  -2  
	         /     \
	       -5       12
	       /       /
	      6       14
	-----------------------
	    Binary Tree
	-----------------------
	*/
	tree.root = TreeNode(1);
	tree.root?.left = TreeNode(-8);
	tree.root?.right = TreeNode(13);
	tree.root?.left?.left = TreeNode(3);
	tree.root?.left?.right = TreeNode(11);
	tree.root?.left?.right?.left = TreeNode(-7);
	tree.root?.left?.right?.left?.left = TreeNode(9);
	tree.root?.right?.left = TreeNode(16);
	tree.root?.right?.right = TreeNode(5);
	tree.root?.right?.left?.right = TreeNode(4);
	tree.root?.right?.right?.right = TreeNode(2);
	tree.root?.right?.left?.right?.left = TreeNode(1);
	tree.root?.right?.left?.right?.right = TreeNode(-2);
	tree.root?.right?.left?.right?.right?.right = TreeNode(12);
	tree.root?.right?.left?.right?.left?.left = TreeNode(-5);
	tree.root?.right?.left?.right?.left?.left?.left = TreeNode(6);
	tree.root?.right?.left?.right?.right?.right?.left = TreeNode(14);
	// Test
	// Diagonal traversal
	// [1 13 5 2 -8 11 16 4 -2 12 3 -7 1 14 9 -5 6]
	// k = 3
	// Result = 5
	tree.findKthDiagonal(3);
	// k = 7
	// Result = 16
	tree.findKthDiagonal(7);
	// k = 19
	// Result = None
	tree.findKthDiagonal(19);
	// k = 13
	// Result = 1
	tree.findKthDiagonal(13);
}

Output

 3th diagonal element is : 5

 7th diagonal element is : 16

 19th diagonal element are not exist

 13th diagonal element is : 1


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