Print the middle nodes of each level of a binary tree
Here given code implementation process.
import java.util.ArrayList;
// Java program for
// Print the middle nodes of each level of a 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;
}
}
// Queue Node
class QNode
{
public TreeNode n;
public QNode next;
public QNode(TreeNode n)
{
this.n = n;
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 n)
{
QNode node = new QNode(n);
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 TreeNode peek()
{
if (this.isSize() == 0)
{
return null;
}
else
{
return this.front.n;
}
}
}
// Define Binary Tree
public class BinaryTree
{
public TreeNode root;
public BinaryTree()
{
this.root = null;
}
// Print the middle element of given level
public void printMiddleNode(ArrayList < Integer > level)
{
if (level.size() > 0)
{
int middle = level.size() / 2;
if ((level.size() % 2) == 0)
{
// When two middle element possible
System.out.print("\n " + level.get(middle - 1));
System.out.print(" " + level.get(middle));
}
else
{
System.out.print("\n " + level.get(middle));
}
}
}
// This is display middle node of each level in binary tree
public void middleLevelNode()
{
if (this.root == null)
{
// When tree is empty
return;
}
// Auxiliary queue which is capable to contain a tree level nodes
MyQueue q1 = new MyQueue();
MyQueue q2 = new MyQueue();
// Auxiliary temp variable
TreeNode temp = null;
int level = 1;
// It will be use assemble a level node.
ArrayList < Integer > record = new ArrayList < Integer > ();
// Add first node in q1
q1.enqueue(this.root);
// This loop execute until auxiliary queue q1 and q2 are not empty
while (!q1.isEmpty() || !q2.isEmpty())
{
// Execute loop until q1 queue are not empty
// And store the next level node in q2 queue
while (!q1.isEmpty())
{
// Get top node of q1 queue
temp = q1.peek();
// Add node value
record.add(temp.data);
if (temp.left != null)
{
q2.enqueue(temp.left);
}
if (temp.right != null)
{
q2.enqueue(temp.right);
}
// Remove top element of q1 queue
q1.dequeue();
}
printMiddleNode(record);
record.clear();
level++;
// Execute loop until q2 queue are not empty
// And store the next level node in q1 queue
while (!q2.isEmpty())
{
// Get top node of q2 queue
temp = q2.peek();
// Add node value
record.add(temp.data);
if (temp.left != null)
{
q1.enqueue(temp.left);
}
if (temp.right != null)
{
q1.enqueue(temp.right);
}
// Remove top element of q2 queue
q2.dequeue();
}
printMiddleNode(record);
record.clear();
level++;
}
}
public static void main(String[] args)
{
BinaryTree tree = new BinaryTree();
/*
Create Binary Tree
-----------------
-6
/ \
4 -7
/ \ \
2 3 12
/ \ / \
10 -4 5 9
/ \ \
1 7 8
*/
tree.root = new TreeNode(-6);
tree.root.left = new TreeNode(4);
tree.root.left.right = new TreeNode(3);
tree.root.left.right.left = new TreeNode(10);
tree.root.left.right.left.left = new TreeNode(1);
tree.root.left.right.right = new TreeNode(-4);
tree.root.left.right.right.right = new TreeNode(7);
tree.root.left.left = new TreeNode(2);
tree.root.right = new TreeNode(-7);
tree.root.right.right = new TreeNode(12);
tree.root.right.right.left = new TreeNode(5);
tree.root.right.right.right = new TreeNode(9);
tree.root.right.right.right.right = new TreeNode(8);
tree.middleLevelNode();
}
}
input
-6
4 -7
3
-4 5
7
// Include header file
#include <iostream>
#include <vector>
using namespace std;
// C++ program for
// Print the middle nodes of each level of a 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;
}
};
// Queue Node
class QNode
{
public:
TreeNode *n;
QNode *next;
QNode(TreeNode *n)
{
this->n = n;
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 *n)
{
QNode *node = new QNode(n);
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)
{
QNode *temp = this->front;
if (this->rear == this->front)
{
this->rear = NULL;
this->front = NULL;
}
else
{
this->front = this->front->next;
}
this->size--;
// Free memory
delete temp;
}
}
int isSize()
{
return this->size;
}
bool isEmpty()
{
if (this->isSize() == 0)
{
return true;
}
return false;
}
TreeNode *peek()
{
if (this->isSize() == 0)
{
return NULL;
}
else
{
return this->front->n;
}
}
};
// Define Binary Tree
class BinaryTree
{
public: TreeNode *root;
BinaryTree()
{
this->root = NULL;
}
// Print the middle element of given level
void printMiddleNode(vector < int > level)
{
if (level.size() > 0)
{
int middle = level.size() / 2;
if ((level.size() % 2) == 0)
{
// When two middle element possible
cout << "\n " << level.at(middle - 1);
cout << " " << level.at(middle);
}
else
{
cout << "\n " << level.at(middle);
}
}
}
// This is display middle node of each level in binary tree
void middleLevelNode()
{
if (this->root == NULL)
{
// When tree is empty
return;
}
// Auxiliary queue which is capable to contain a tree level nodes
MyQueue *q1 = new MyQueue();
MyQueue *q2 = new MyQueue();
// Auxiliary temp variable
TreeNode *temp = NULL;
int level = 1;
// It will be use assemble a level node.
vector < int > record ;
// Add first node in q1
q1->enqueue(this->root);
// This loop execute until auxiliary queue q1 and q2 are not empty
while (!q1->isEmpty() || !q2->isEmpty())
{
// Execute loop until q1 queue are not empty
// And store the next level node in q2 queue
while (!q1->isEmpty())
{
// Get top node of q1 queue
temp = q1->peek();
// Add node value
record.push_back(temp->data);
if (temp->left != NULL)
{
q2->enqueue(temp->left);
}
if (temp->right != NULL)
{
q2->enqueue(temp->right);
}
// Remove top element of q1 queue
q1->dequeue();
}
this->printMiddleNode(record);
record.clear();
level++;
// Execute loop until q2 queue are not empty
// And store the next level node in q1 queue
while (!q2->isEmpty())
{
// Get top node of q2 queue
temp = q2->peek();
// Add node value
record.push_back(temp->data);
if (temp->left != NULL)
{
q1->enqueue(temp->left);
}
if (temp->right != NULL)
{
q1->enqueue(temp->right);
}
// Remove top element of q2 queue
q2->dequeue();
}
this->printMiddleNode(record);
record.clear();
level++;
}
}
};
int main()
{
BinaryTree *tree = new BinaryTree();
/*
Create Binary Tree
-----------------
-6
/ \
4 -7
/ \ \
2 3 12
/ \ / \
10 -4 5 9
/ \ \
1 7 8
*/
tree->root = new TreeNode(-6);
tree->root->left = new TreeNode(4);
tree->root->left->right = new TreeNode(3);
tree->root->left->right->left = new TreeNode(10);
tree->root->left->right->left->left = new TreeNode(1);
tree->root->left->right->right = new TreeNode(-4);
tree->root->left->right->right->right = new TreeNode(7);
tree->root->left->left = new TreeNode(2);
tree->root->right = new TreeNode(-7);
tree->root->right->right = new TreeNode(12);
tree->root->right->right->left = new TreeNode(5);
tree->root->right->right->right = new TreeNode(9);
tree->root->right->right->right->right = new TreeNode(8);
tree->middleLevelNode();
return 0;
}
input
-6
4 -7
3
-4 5
7
// Include namespace system
using System;
using System.Collections.Generic;
// Csharp program for
// Print the middle nodes of each level of a 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;
}
}
// Queue Node
public class QNode
{
public TreeNode n;
public QNode next;
public QNode(TreeNode n)
{
this.n = n;
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 n)
{
QNode node = new QNode(n);
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 TreeNode peek()
{
if (this.isSize() == 0)
{
return null;
}
else
{
return this.front.n;
}
}
}
// Define Binary Tree
public class BinaryTree
{
public TreeNode root;
public BinaryTree()
{
this.root = null;
}
// Print the middle element of given level
public void printMiddleNode(List<int> level)
{
if (level.Count > 0)
{
int middle = level.Count / 2;
if ((level.Count % 2) == 0)
{
// When two middle element possible
Console.Write("\n " + level[middle - 1]);
Console.Write(" " + level[middle]);
}
else
{
Console.Write("\n " + level[middle]);
}
}
}
// This is display middle node of each level in binary tree
public void middleLevelNode()
{
if (this.root == null)
{
// When tree is empty
return;
}
// Auxiliary queue which is capable to contain a tree level nodes
MyQueue q1 = new MyQueue();
MyQueue q2 = new MyQueue();
// Auxiliary temp variable
TreeNode temp = null;
int level = 1;
// It will be use assemble a level node.
List < int > record = new List < int > ();
// Add first node in q1
q1.enqueue(this.root);
// This loop execute until auxiliary queue q1 and q2 are not empty
while (!q1.isEmpty() || !q2.isEmpty())
{
// Execute loop until q1 queue are not empty
// And store the next level node in q2 queue
while (!q1.isEmpty())
{
// Get top node of q1 queue
temp = q1.peek();
// Add node value
record.Add(temp.data);
if (temp.left != null)
{
q2.enqueue(temp.left);
}
if (temp.right != null)
{
q2.enqueue(temp.right);
}
// Remove top element of q1 queue
q1.dequeue();
}
this.printMiddleNode(record);
record.Clear();
level++;
// Execute loop until q2 queue are not empty
// And store the next level node in q1 queue
while (!q2.isEmpty())
{
// Get top node of q2 queue
temp = q2.peek();
// Add node value
record.Add(temp.data);
if (temp.left != null)
{
q1.enqueue(temp.left);
}
if (temp.right != null)
{
q1.enqueue(temp.right);
}
// Remove top element of q2 queue
q2.dequeue();
}
this.printMiddleNode(record);
record.Clear();
level++;
}
}
public static void Main(String[] args)
{
BinaryTree tree = new BinaryTree();
/*
Create Binary Tree
-----------------
-6
/ \
4 -7
/ \ \
2 3 12
/ \ / \
10 -4 5 9
/ \ \
1 7 8
*/
tree.root = new TreeNode(-6);
tree.root.left = new TreeNode(4);
tree.root.left.right = new TreeNode(3);
tree.root.left.right.left = new TreeNode(10);
tree.root.left.right.left.left = new TreeNode(1);
tree.root.left.right.right = new TreeNode(-4);
tree.root.left.right.right.right = new TreeNode(7);
tree.root.left.left = new TreeNode(2);
tree.root.right = new TreeNode(-7);
tree.root.right.right = new TreeNode(12);
tree.root.right.right.left = new TreeNode(5);
tree.root.right.right.right = new TreeNode(9);
tree.root.right.right.right.right = new TreeNode(8);
tree.middleLevelNode();
}
}
input
-6
4 -7
3
-4 5
7
<?php
// Php program for
// Print the middle nodes of each level of a 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;
}
}
// Queue Node
class QNode
{
public $n;
public $next;
public function __construct($n)
{
$this->n = $n;
$this->next = NULL;
}
}
//Define custom queue class
class MyQueue
{
public $front;
public $rear;
public $size;
public function __construct()
{
$this->front = NULL;
$this->rear = NULL;
$this->size = 0;
}
// Add a new node at last of queue
public function enqueue($n)
{
$node = new QNode($n);
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->n;
}
}
}
// Define Binary Tree
class BinaryTree
{
public $root;
public function __construct()
{
$this->root = NULL;
}
// Print the middle element of given level
public function printMiddleNode($level)
{
if (count($level) > 0)
{
$middle = (int)(count($level) / 2);
if ((count($level) % 2) == 0)
{
// When two middle element possible
echo("\n ".$level[$middle - 1]);
echo(" ".$level[$middle]);
}
else
{
echo("\n ".$level[$middle]);
}
}
}
// This is display middle node of each level in binary tree
public function middleLevelNode()
{
if ($this->root == NULL)
{
// When tree is empty
return;
}
// Auxiliary queue which is capable to contain a tree level nodes
$q1 = new MyQueue();
$q2 = new MyQueue();
// Auxiliary temp variable
$temp = NULL;
$level = 1;
// It will be use assemble a level node.
$record = array();
// Add first node in q1
$q1->enqueue($this->root);
// This loop execute until auxiliary queue q1 and q2 are not empty
while (!$q1->isEmpty() || !$q2->isEmpty())
{
// Execute loop until q1 queue are not empty
// And store the next level node in q2 queue
while (!$q1->isEmpty())
{
// Get top node of q1 queue
$temp = $q1->peek();
// Add node value
$record[] = $temp->data;
if ($temp->left != NULL)
{
$q2->enqueue($temp->left);
}
if ($temp->right != NULL)
{
$q2->enqueue($temp->right);
}
// Remove top element of q1 queue
$q1->dequeue();
}
$this->printMiddleNode($record);
$record = array();
$level++;
// Execute loop until q2 queue are not empty
// And store the next level node in q1 queue
while (!$q2->isEmpty())
{
// Get top node of q2 queue
$temp = $q2->peek();
// Add node value
$record[] = $temp->data;
if ($temp->left != NULL)
{
$q1->enqueue($temp->left);
}
if ($temp->right != NULL)
{
$q1->enqueue($temp->right);
}
// Remove top element of q2 queue
$q2->dequeue();
}
$this->printMiddleNode($record);
$record = array();
$level++;
}
}
}
function main()
{
$tree = new BinaryTree();
/*
Create Binary Tree
-----------------
-6
/ \
4 -7
/ \ \
2 3 12
/ \ / \
10 -4 5 9
/ \ \
1 7 8
*/
$tree->root = new TreeNode(-6);
$tree->root->left = new TreeNode(4);
$tree->root->left->right = new TreeNode(3);
$tree->root->left->right->left = new TreeNode(10);
$tree->root->left->right->left->left = new TreeNode(1);
$tree->root->left->right->right = new TreeNode(-4);
$tree->root->left->right->right->right = new TreeNode(7);
$tree->root->left->left = new TreeNode(2);
$tree->root->right = new TreeNode(-7);
$tree->root->right->right = new TreeNode(12);
$tree->root->right->right->left = new TreeNode(5);
$tree->root->right->right->right = new TreeNode(9);
$tree->root->right->right->right->right = new TreeNode(8);
$tree->middleLevelNode();
}
main();
input
-6
4 -7
3
-4 5
7
// Node JS program for
// Print the middle nodes of each level of a binary tree
// Binary Tree node
class TreeNode
{
constructor(data)
{
// Set node value
this.data = data;
this.left = null;
this.right = null;
}
}
// Queue Node
class QNode
{
constructor(n)
{
this.n = n;
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(n)
{
var node = new QNode(n);
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.n;
}
}
}
// Define Binary Tree
class BinaryTree
{
constructor()
{
this.root = null;
}
// Print the middle element of given level
printMiddleNode(level)
{
if (level.length > 0)
{
var middle = parseInt(level.length / 2);
if ((level.length % 2) == 0)
{
// When two middle element possible
process.stdout.write("\n " + level[middle - 1]);
process.stdout.write(" " + level[middle]);
}
else
{
process.stdout.write("\n " + level[middle]);
}
}
}
// This is display middle node of each level in binary tree
middleLevelNode()
{
if (this.root == null)
{
// When tree is empty
return;
}
// Auxiliary queue which is capable to contain a tree level nodes
var q1 = new MyQueue();
var q2 = new MyQueue();
// Auxiliary temp variable
var temp = null;
var level = 1;
// It will be use assemble a level node.
var record = [];
// Add first node in q1
q1.enqueue(this.root);
// This loop execute until auxiliary queue q1 and q2 are not empty
while (!q1.isEmpty() || !q2.isEmpty())
{
// Execute loop until q1 queue are not empty
// And store the next level node in q2 queue
while (!q1.isEmpty())
{
// Get top node of q1 queue
temp = q1.peek();
// Add node value
record.push(temp.data);
if (temp.left != null)
{
q2.enqueue(temp.left);
}
if (temp.right != null)
{
q2.enqueue(temp.right);
}
// Remove top element of q1 queue
q1.dequeue();
}
this.printMiddleNode(record);
record = [];
level++;
// Execute loop until q2 queue are not empty
// And store the next level node in q1 queue
while (!q2.isEmpty())
{
// Get top node of q2 queue
temp = q2.peek();
// Add node value
record.push(temp.data);
if (temp.left != null)
{
q1.enqueue(temp.left);
}
if (temp.right != null)
{
q1.enqueue(temp.right);
}
// Remove top element of q2 queue
q2.dequeue();
}
this.printMiddleNode(record);
record = [];
level++;
}
}
}
function main()
{
var tree = new BinaryTree();
/*
Create Binary Tree
-----------------
-6
/ \
4 -7
/ \ \
2 3 12
/ \ / \
10 -4 5 9
/ \ \
1 7 8
*/
tree.root = new TreeNode(-6);
tree.root.left = new TreeNode(4);
tree.root.left.right = new TreeNode(3);
tree.root.left.right.left = new TreeNode(10);
tree.root.left.right.left.left = new TreeNode(1);
tree.root.left.right.right = new TreeNode(-4);
tree.root.left.right.right.right = new TreeNode(7);
tree.root.left.left = new TreeNode(2);
tree.root.right = new TreeNode(-7);
tree.root.right.right = new TreeNode(12);
tree.root.right.right.left = new TreeNode(5);
tree.root.right.right.right = new TreeNode(9);
tree.root.right.right.right.right = new TreeNode(8);
tree.middleLevelNode();
}
main();
input
-6
4 -7
3
-4 5
7
# Python 3 program for
# Print the middle nodes of each level of a binary tree
# Binary Tree node
class TreeNode :
def __init__(self, data) :
# Set node value
self.data = data
self.left = None
self.right = None
# Queue Node
class QNode :
def __init__(self, n) :
self.n = n
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, n) :
node = QNode(n)
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.n
# Define Binary Tree
class BinaryTree :
def __init__(self) :
self.root = None
# Print the middle element of given level
def printMiddleNode(self, level) :
if (len(level) > 0) :
middle = int(len(level) / 2)
if ((len(level) % 2) == 0) :
# When two middle element possible
print("\n ", level[middle - 1], end = "")
print(" ", level[middle], end = "")
else :
print("\n ", level[middle], end = "")
# This is display middle node of each level in binary tree
def middleLevelNode(self) :
if (self.root == None) :
# When tree is empty
return
# Auxiliary queue which is capable to contain a tree level nodes
q1 = MyQueue()
q2 = MyQueue()
# Auxiliary temp variable
temp = None
level = 1
# It will be use assemble a level node.
record = []
# Add first node in q1
q1.enqueue(self.root)
# This loop execute until auxiliary queue q1 and q2 are not empty
while (not q1.isEmpty() or not q2.isEmpty()) :
# Execute loop until q1 queue are not empty
# And store the next level node in q2 queue
while (not q1.isEmpty()) :
# Get top node of q1 queue
temp = q1.peek()
# Add node value
record.append(temp.data)
if (temp.left != None) :
q2.enqueue(temp.left)
if (temp.right != None) :
q2.enqueue(temp.right)
# Remove top element of q1 queue
q1.dequeue()
self.printMiddleNode(record)
record.clear()
level += 1
# Execute loop until q2 queue are not empty
# And store the next level node in q1 queue
while (not q2.isEmpty()) :
# Get top node of q2 queue
temp = q2.peek()
# Add node value
record.append(temp.data)
if (temp.left != None) :
q1.enqueue(temp.left)
if (temp.right != None) :
q1.enqueue(temp.right)
# Remove top element of q2 queue
q2.dequeue()
self.printMiddleNode(record)
record.clear()
level += 1
def main() :
tree = BinaryTree()
# Create Binary Tree
# -----------------
# -6
# / \
# 4 -7
# / \ \
# 2 3 12
# / \ / \
# 10 -4 5 9
# / \ \
# 1 7 8
tree.root = TreeNode(-6)
tree.root.left = TreeNode(4)
tree.root.left.right = TreeNode(3)
tree.root.left.right.left = TreeNode(10)
tree.root.left.right.left.left = TreeNode(1)
tree.root.left.right.right = TreeNode(-4)
tree.root.left.right.right.right = TreeNode(7)
tree.root.left.left = TreeNode(2)
tree.root.right = TreeNode(-7)
tree.root.right.right = TreeNode(12)
tree.root.right.right.left = TreeNode(5)
tree.root.right.right.right = TreeNode(9)
tree.root.right.right.right.right = TreeNode(8)
tree.middleLevelNode()
if __name__ == "__main__": main()
input
-6
4 -7
3
-4 5
7
# Ruby program for
# Print the middle nodes of each level of a 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
# Queue Node
class QNode
# Define the accessor and reader of class QNode
attr_reader :n, :next
attr_accessor :n, :next
def initialize(n)
self.n = n
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(n)
node = QNode.new(n)
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.n
end
end
end
# Define Binary Tree
class BinaryTree
# Define the accessor and reader of class BinaryTree
attr_reader :root
attr_accessor :root
def initialize()
self.root = nil
end
# Print the middle element of given level
def printMiddleNode(level)
if (level.length > 0)
middle = level.length / 2
if ((level.length % 2) == 0)
# When two middle element possible
print("\n ", level[middle - 1])
print(" ", level[middle])
else
print("\n ", level[middle])
end
end
end
# This is display middle node of each level in binary tree
def middleLevelNode()
if (self.root == nil)
# When tree is empty
return
end
# Auxiliary queue which is capable to contain a tree level nodes
q1 = MyQueue.new()
q2 = MyQueue.new()
# Auxiliary temp variable
temp = nil
level = 1
# It will be use assemble a level node.
record = []
# Add first node in q1
q1.enqueue(self.root)
# This loop execute until auxiliary queue q1 and q2 are not empty
while (!q1.isEmpty() || !q2.isEmpty())
# Execute loop until q1 queue are not empty
# And store the next level node in q2 queue
while (!q1.isEmpty())
# Get top node of q1 queue
temp = q1.peek()
# Add node value
record.push(temp.data)
if (temp.left != nil)
q2.enqueue(temp.left)
end
if (temp.right != nil)
q2.enqueue(temp.right)
end
# Remove top element of q1 queue
q1.dequeue()
end
self.printMiddleNode(record)
record.clear()
level += 1
# Execute loop until q2 queue are not empty
# And store the next level node in q1 queue
while (!q2.isEmpty())
# Get top node of q2 queue
temp = q2.peek()
# Add node value
record.push(temp.data)
if (temp.left != nil)
q1.enqueue(temp.left)
end
if (temp.right != nil)
q1.enqueue(temp.right)
end
# Remove top element of q2 queue
q2.dequeue()
end
self.printMiddleNode(record)
record.clear()
level += 1
end
end
end
def main()
tree = BinaryTree.new()
# Create Binary Tree
# -----------------
# -6
# / \
# 4 -7
# / \ \
# 2 3 12
# / \ / \
# 10 -4 5 9
# / \ \
# 1 7 8
tree.root = TreeNode.new(-6)
tree.root.left = TreeNode.new(4)
tree.root.left.right = TreeNode.new(3)
tree.root.left.right.left = TreeNode.new(10)
tree.root.left.right.left.left = TreeNode.new(1)
tree.root.left.right.right = TreeNode.new(-4)
tree.root.left.right.right.right = TreeNode.new(7)
tree.root.left.left = TreeNode.new(2)
tree.root.right = TreeNode.new(-7)
tree.root.right.right = TreeNode.new(12)
tree.root.right.right.left = TreeNode.new(5)
tree.root.right.right.right = TreeNode.new(9)
tree.root.right.right.right.right = TreeNode.new(8)
tree.middleLevelNode()
end
main()
input
-6
4 -7
3
-4 5
7
import scala.collection.mutable._;
// Scala program for
// Print the middle nodes of each level of a 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);
}
}
// Queue Node
class QNode(var n: TreeNode , var next: QNode)
{
def this(n: TreeNode)
{
this(n,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(n: TreeNode): Unit = {
var node: QNode = new QNode(n);
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(): TreeNode = {
if (this.isSize() == 0)
{
return null;
}
else
{
return this.front.n;
}
}
}
// Define Binary Tree
class BinaryTree(var root: TreeNode)
{
def this()
{
this(null);
}
// Print the middle element of given level
def printMiddleNode(level: ArrayBuffer[Int]): Unit = {
if (level.size > 0)
{
var middle: Int = level.size / 2;
if ((level.size % 2) == 0)
{
// When two middle element possible
print("\n " + level(middle - 1));
print(" " + level(middle));
}
else
{
print("\n " + level(middle));
}
}
}
// This is display middle node of each level in binary tree
def middleLevelNode(): Unit = {
if (this.root == null)
{
// When tree is empty
return;
}
// Auxiliary queue which is capable to contain a tree level nodes
var q1: MyQueue = new MyQueue();
var q2: MyQueue = new MyQueue();
// Auxiliary temp variable
var temp: TreeNode = null;
var level: Int = 1;
// It will be use assemble a level node.
var record: ArrayBuffer[Int] = new ArrayBuffer[Int]();
// Add first node in q1
q1.enqueue(this.root);
// This loop execute until auxiliary queue q1 and q2 are not empty
while (!q1.isEmpty() || !q2.isEmpty())
{
// Execute loop until q1 queue are not empty
// And store the next level node in q2 queue
while (!q1.isEmpty())
{
// Get top node of q1 queue
temp = q1.peek();
// Add node value
record += temp.data;
if (temp.left != null)
{
q2.enqueue(temp.left);
}
if (temp.right != null)
{
q2.enqueue(temp.right);
}
// Remove top element of q1 queue
q1.dequeue();
}
printMiddleNode(record);
record.clear();
level += 1;
// Execute loop until q2 queue are not empty
// And store the next level node in q1 queue
while (!q2.isEmpty())
{
// Get top node of q2 queue
temp = q2.peek();
// Add node value
record += temp.data;
if (temp.left != null)
{
q1.enqueue(temp.left);
}
if (temp.right != null)
{
q1.enqueue(temp.right);
}
// Remove top element of q2 queue
q2.dequeue();
}
printMiddleNode(record);
record.clear();
level += 1;
}
}
}
object Main
{
def main(args: Array[String]): Unit = {
var tree: BinaryTree = new BinaryTree();
/*
Create Binary Tree
-----------------
-6
/ \
4 -7
/ \ \
2 3 12
/ \ / \
10 -4 5 9
/ \ \
1 7 8
*/
tree.root = new TreeNode(-6);
tree.root.left = new TreeNode(4);
tree.root.left.right = new TreeNode(3);
tree.root.left.right.left = new TreeNode(10);
tree.root.left.right.left.left = new TreeNode(1);
tree.root.left.right.right = new TreeNode(-4);
tree.root.left.right.right.right = new TreeNode(7);
tree.root.left.left = new TreeNode(2);
tree.root.right = new TreeNode(-7);
tree.root.right.right = new TreeNode(12);
tree.root.right.right.left = new TreeNode(5);
tree.root.right.right.right = new TreeNode(9);
tree.root.right.right.right.right = new TreeNode(8);
tree.middleLevelNode();
}
}
input
-6
4 -7
3
-4 5
7
// Swift 4 program for
// Print the middle nodes of each level of a 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;
}
}
// Queue Node
class QNode
{
var n: TreeNode? ;
var next: QNode? ;
init(_ n: TreeNode? )
{
self.n = n;
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(_ n: TreeNode? )
{
let node: QNode = QNode(n);
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()->TreeNode?
{
if (self.isSize() == 0)
{
return nil;
}
else
{
return self.front!.n;
}
}
}
// Define Binary Tree
class BinaryTree
{
var root: TreeNode? ;
init()
{
self.root = nil;
}
// Print the middle element of given level
func printMiddleNode(_ level: [Int] )
{
if (level.count > 0)
{
let middle: Int = level.count / 2;
if ((level.count % 2) == 0)
{
// When two middle element possible
print("\n ", level[middle - 1], terminator: "");
print(" ", level[middle], terminator: "");
}
else
{
print("\n ", level[middle], terminator: "");
}
}
}
// This is display middle node of each level in binary tree
func middleLevelNode()
{
if (self.root == nil)
{
// When tree is empty
return;
}
// Auxiliary queue which is capable to contain a tree level nodes
let q1: MyQueue = MyQueue();
let q2: MyQueue = MyQueue();
// Auxiliary temp variable
var temp: TreeNode? = nil;
var level: Int = 1;
// It will be use assemble a level node.
var record: [Int] = [Int]();
// Add first node in q1
q1.enqueue(self.root);
// This loop execute until auxiliary queue q1 and q2 are not empty
while (!q1.isEmpty() || !q2.isEmpty())
{
// Execute loop until q1 queue are not empty
// And store the next level node in q2 queue
while (!q1.isEmpty())
{
// Get top node of q1 queue
temp = q1.peek();
// Add node value
record.append(temp!.data);
if (temp!.left != nil)
{
q2.enqueue(temp!.left);
}
if (temp!.right != nil)
{
q2.enqueue(temp!.right);
}
// Remove top element of q1 queue
q1.dequeue();
}
self.printMiddleNode(record);
record.removeAll();
level += 1;
// Execute loop until q2 queue are not empty
// And store the next level node in q1 queue
while (!q2.isEmpty())
{
// Get top node of q2 queue
temp = q2.peek();
// Add node value
record.append(temp!.data);
if (temp!.left != nil)
{
q1.enqueue(temp!.left);
}
if (temp!.right != nil)
{
q1.enqueue(temp!.right);
}
// Remove top element of q2 queue
q2.dequeue();
}
self.printMiddleNode(record);
record.removeAll();
level += 1;
}
}
}
func main()
{
let tree: BinaryTree = BinaryTree();
/*
Create Binary Tree
-----------------
-6
/ \
4 -7
/ \ \
2 3 12
/ \ / \
10 -4 5 9
/ \ \
1 7 8
*/
tree.root = TreeNode(-6);
tree.root!.left = TreeNode(4);
tree.root!.left!.right = TreeNode(3);
tree.root!.left!.right!.left = TreeNode(10);
tree.root!.left!.right!.left!.left = TreeNode(1);
tree.root!.left!.right!.right = TreeNode(-4);
tree.root!.left!.right!.right!.right = TreeNode(7);
tree.root!.left!.left = TreeNode(2);
tree.root!.right = TreeNode(-7);
tree.root!.right!.right = TreeNode(12);
tree.root!.right!.right!.left = TreeNode(5);
tree.root!.right!.right!.right = TreeNode(9);
tree.root!.right!.right!.right!.right = TreeNode(8);
tree.middleLevelNode();
}
main();
input
-6
4 -7
3
-4 5
7
// Kotlin program for
// Print the middle nodes of each level of a 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;
}
}
// Queue Node
class QNode
{
var n: TreeNode ? ;
var next: QNode ? ;
constructor(n: TreeNode ? )
{
this.n = n;
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(n: TreeNode ? ): Unit
{
val node: QNode = QNode(n);
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(): TreeNode ?
{
if (this.isSize() == 0)
{
return null;
}
else
{
return this.front?.n;
}
}
}
// Define Binary Tree
class BinaryTree
{
var root: TreeNode ? ;
constructor()
{
this.root = null;
}
// Print the middle element of given level
fun printMiddleNode(level: MutableList<Int> ): Unit
{
if (level.size > 0)
{
val middle: Int = level.size / 2;
if ((level.size % 2) == 0)
{
// When two middle element possible
print("\n " + level[middle - 1]);
print(" " + level[middle]);
}
else
{
print("\n " + level[middle]);
}
}
}
// This is display middle node of each level in binary tree
fun middleLevelNode(): Unit
{
if (this.root == null)
{
// When tree is empty
return;
}
// Auxiliary queue which is capable to contain a tree level nodes
val q1: MyQueue = MyQueue();
val q2: MyQueue = MyQueue();
// Auxiliary temp variable
var temp: TreeNode ? ;
var level: Int = 1;
// It will be use assemble a level node.
var record = mutableListOf<Int>();
// Add first node in q1
q1.enqueue(this.root);
// This loop execute until auxiliary queue q1 and q2 are not empty
while (!q1.isEmpty() || !q2.isEmpty())
{
// Execute loop until q1 queue are not empty
// And store the next level node in q2 queue
while (!q1.isEmpty())
{
// Get top node of q1 queue
temp = q1.peek();
// Add node value
record.add(temp!!.data);
if (temp.left != null)
{
q2.enqueue(temp.left);
}
if (temp.right != null)
{
q2.enqueue(temp.right);
}
// Remove top element of q1 queue
q1.dequeue();
}
this.printMiddleNode(record);
record.clear();
level += 1;
// Execute loop until q2 queue are not empty
// And store the next level node in q1 queue
while (!q2.isEmpty())
{
// Get top node of q2 queue
temp = q2.peek();
// Add node value
record.add(temp!!.data);
if (temp.left != null)
{
q1.enqueue(temp.left);
}
if (temp.right != null)
{
q1.enqueue(temp.right);
}
// Remove top element of q2 queue
q2.dequeue();
}
this.printMiddleNode(record);
record.clear();
level += 1;
}
}
}
fun main(args: Array < String > ): Unit
{
val tree: BinaryTree = BinaryTree();
/*
Create Binary Tree
-----------------
-6
/ \
4 -7
/ \ \
2 3 12
/ \ / \
10 -4 5 9
/ \ \
1 7 8
*/
tree.root = TreeNode(-6);
tree.root?.left = TreeNode(4);
tree.root?.left?.right = TreeNode(3);
tree.root?.left?.right?.left = TreeNode(10);
tree.root?.left?.right?.left?.left = TreeNode(1);
tree.root?.left?.right?.right = TreeNode(-4);
tree.root?.left?.right?.right?.right = TreeNode(7);
tree.root?.left?.left = TreeNode(2);
tree.root?.right = TreeNode(-7);
tree.root?.right?.right = TreeNode(12);
tree.root?.right?.right?.left = TreeNode(5);
tree.root?.right?.right?.right = TreeNode(9);
tree.root?.right?.right?.right?.right = TreeNode(8);
tree.middleLevelNode();
}
input
-6
4 -7
3
-4 5
7
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