Day 23: BST Level-Order Traversal Hackerrank Solution Java

 Day 23: BST Level-Order Traversal

For Explanation Check Video:

 

Sample Input

6
3
5
4
7
2
1

Sample Output

3 2 5 1 4 7 

Code:

import java.util.*;
import java.io.*;
class Node{
    Node left,right;
    int data;
    Node(int data){
        this.data=data;
        left=right=null;
    }
}
class Solution{
static void levelOrder(Node root){   
    Queue<Node> queue = new LinkedList<>();
    queue.add(root);
    while(queue.peek()!=null){
        Node node = queue.remove();
        System.out.print(node.data+" ");
        if(node.left!=null){
            queue.add(node.left);
        }
        if(node.right!=null){
            queue.add(node.right);
        }
    }
       
    }
public static Node insert(Node root,int data){
        if(root==null){
            return new Node(data);
        }
        else{
            Node cur;
            if(data<=root.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(System.in);
            int T=sc.nextInt();
            Node root=null;
            while(T-->0){
                int data=sc.nextInt();
                root=insert(root,data);
            }
            levelOrder(root);
        }   
}