Find the Deepest Node in a Binary Tree Using Queue STL – SET 2
Given a binary tree. The task is to find the value of the deepest node in the given binary tree.
Examples:
Input: Root of below tree
1
/ \
2 3
/ \ / \
4 5 6 7
\
8
Output: 8
Input: Root of below tree
1
/ \
2 3
/
6
Output: 6
Approach: We have already discussed the two different ways to find the deepest node in a binary tree in this post. Here, we will find the deepest node in the tree using a queue data structure. We will first push the root into the queue and then we will push it’s child nodes after removing parent node from the queue. We will continue this process until the queue empty. The last node in the queue is the deepest node of the binary tree.
Below is the implementation of the above approach :
C++
// C++ program to find the value of the // deepest node in a given binary tree. #include <bits/stdc++.h> using namespace std; // A tree node struct Node { int data; struct Node *left , *right; }; // Utility function to create a new node Node *newNode(int data) { Node *temp = new Node; temp->data = data; temp->left = temp->right = NULL; return temp; } // Function to find the deepest node in a tree int findDeepest(struct Node* root) { struct Node* temp = NULL; queue <Node *> q; if(root == NULL) return 0; // Push the root node q.push(root); while(!q.empty()) { temp = q.front(); q.pop(); // Push left child if(temp->left) q.push(temp->left); // Push right child if(temp->right) q.push(temp->right); } // Return the deepest node's value return temp->data; } // Driver code int main() { Node* root = newNode(1); root->left = newNode(2); root->right = newNode(3); root->left->left = newNode(4); root->right->left = newNode(5); root->right->right = newNode(6); root->right->left->right = newNode(7); root->right->right->right = newNode(8); root->right->left->right->left = newNode(9); // Function call cout << findDeepest(root); return 0; } |
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Java
// Java program to find the value of the
// deepest node in a given binary tree.
import java.util.*;
class GFG
{
// A tree node
static class Node
{
int data;
Node left , right;
};
// Utility function to create a new node
static Node newNode(int data)
{
Node temp = new Node();
temp.data = data;
temp.left = temp.right = null;
return temp;
}
// Function to find the deepest node in a tree
static int findDeepest(Node root)
{
Node temp = null;
Queue
if(root == null)
return 0;
// Push the root node
q.add(root);
while(!q.isEmpty())
{
temp = q.peek();
q.remove();
// Push left child
if(temp.left!=null)
q.add(temp.left);
// Push right child
if(temp.right!=null)
q.add(temp.right);
}
// Return the deepest node’s value
return temp.data;
}
// Driver code
public static void main(String[] args)
{
Node root = newNode(1);
root.left = newNode(2);
root.right = newNode(3);
root.left.left = newNode(4);
root.right.left = newNode(5);
root.right.right = newNode(6);
root.right.left.right = newNode(7);
root.right.right.right = newNode(8);
root.right.left.right.left = newNode(9);
// Function call
System.out.println(findDeepest(root));
}
}
// This code is contributed by 29AjayKumar
Output:
9
Time Complexity: O(N)
Recommended Posts:
- Find the Deepest Node in a Binary Tree
- Depth of the deepest odd level node in Binary Tree
- Deepest left leaf node in a binary tree
- Deepest right leaf node in a binary tree | Iterative approach
- Deepest left leaf node in a binary tree | iterative approach
- Find depth of the deepest odd level leaf node
- Find maximum and minimum element in binary tree without using recursion or stack or queue
- Find mirror of a given node in Binary tree
- Find the maximum node at a given level in a binary tree
- Find the color of given node in an infinite binary tree
- Find the node with maximum value in a Binary Search Tree
- Find n-th node in Preorder traversal of a Binary Tree
- Find distance from root to given node in a binary tree
- Find n-th node in Postorder traversal of a Binary Tree
- Find the node with minimum value in a Binary Search Tree
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Improved By : 29AjayKumar
