Day 23 : BST Level-Order Travarsal
Solution In Java 8:
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.isEmpty()) {
Node curr = queue.remove();
System.out.print(curr.data + " ");
if (curr.left != null) queue.add(curr.left);
if (curr.right != null) queue.add(curr.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);
}
}
Solution In Python 3:
import sys
class Node:
def __init__(self,data):
self.right=self.left=None
self.data = data
class Solution:
def insert(self,root,data):
if root==None:
return Node(data)
else:
if data<=root.data:
cur=self.insert(root.left,data)
root.left=cur
else:
cur=self.insert(root.right,data)
root.right=cur
return root
def levelOrder(self, root):
queue = [root]
while len(queue) is not 0:
curr = queue[0]
queue = queue[1:]
print(str(curr.data) + " ", end="")
if curr.left is not None:
queue.append(curr.left)
if curr.right is not None:
queue.append(curr.right)
T=int(input())
myTree=Solution()
root=None
for i in range(T):
data=int(input())
root=myTree.insert(root,data)
myTree.levelOrder(root)
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);
}
}
Solution In Python 3:
import sys
class Node:
def __init__(self,data):
self.right=self.left=None
self.data = data
class Solution:
def insert(self,root,data):
if root==None:
return Node(data)
else:
if data<=root.data:
cur=self.insert(root.left,data)
root.left=cur
else:
cur=self.insert(root.right,data)
root.right=cur
return root
def levelOrder(self, root):
queue = [root]
while len(queue) is not 0:
curr = queue[0]
queue = queue[1:]
print(str(curr.data) + " ", end="")
if curr.left is not None:
queue.append(curr.left)
if curr.right is not None:
queue.append(curr.right)
T=int(input())
myTree=Solution()
root=None
for i in range(T):
data=int(input())
root=myTree.insert(root,data)
myTree.levelOrder(root)
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