Day 23: BST Level-Order Traversal In Java | 30 Days Of Code | Hackerrank Programming Solutions

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Link for the ProblemDay 23: BST Level-Order Traversal – Hacker Rank Solution

Day 23: BST Level-Order Traversal – Hacker Rank Solution


Day 23: BST Level-Order Traversal – Hacker Rank Solution
import java.util.LinkedList;
import java.util.Queue;
import java.util.Scanner;

 * @author Techno-RJ
public class Day23BSTLevelOrderTraversal {
	static class Node {
		Node left, right;
		int data;

		Node(int data) { = data;
			left = right = null;

	static void levelOrder(Node root) {
		if (root == null)
			System.out.println("nothing to display");
		Queue<Node> q = new LinkedList<Node>();
		while (!q.isEmpty()) {
			Node node = (Node) q.poll();
			System.out.print( + " ");
			if (node.left != null)
			if (node.right != null)


	public static Node insert(Node root, int data) {
		if (root == null) {
			return new Node(data);
		} else {
			Node cur;
			if (data <= {
				cur = insert(root.left, data);
				root.left = cur;
			} else {
				cur = insert(root.right, data);
				root.right = cur;
			return root;

	public static void main(String args[]) {
		Scanner sc = new Scanner(;
		int T = sc.nextInt();
		Node root = null;
		while (T-- > 0) {
			int data = sc.nextInt();
			root = insert(root, data);

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