How To Impress All Leafage Nodes Of A Binary Tree Inwards Coffee - Coding Interview Questions

This is to a greater extent than or less other interesting coding problem which is based on a binary tree in addition to to a greater extent than often than non asked beginner programmers. If yous conduct keep to a greater extent than or less experience inwards solving binary tree based problems thence it's rather slow to solve because, similar many other binary tree algorithms, yous tin role recursion to impress all leafage nodes of a binary tree inwards Java. Since the tree is a recursive information structure, yous tin apply the same algorithm to both the left in addition to correct subtree. In lodge to solve this problem, the starting fourth dimension matter yous should know is what is a leafage node because if yous don't know that thence yous won't travel able to solve the problem. Well, a leafage node is the i who's left in addition to correct kid nodes are null.

So yous tin impress all leafage nodes past times traversing the tree, checking each node to detect if their left in addition to correct nodes are zero in addition to thence printing that node. That would travel your leafage node.

The logic is real much similar to post lodge traversal but instead of only printing node, yous equally good demand to starting fourth dimension cheque if both left in addition to correct children are zero or not. It is equally good i of the oftentimes asked programming interview questions.

Since the binary tree is an essential business office of Data Structures in addition to Algorithms, yous tin human face a distich of questions on binary trees in addition to binary search tree, equally good known equally BST inwards your programming labor interview, like whether a given tree is a binary search tree or not? 

That's why a proficient noesis of essential information construction in addition to algorithms are mandatory for whatever programmer travel it a Java, Python or C++ developer. If yous experience that yous lack essential Data Structure science or desire to amend your noesis nearly Data Structures in addition to Algorithms, thence I advise yous convey a human face at Data Structures in addition to Algorithms: Deep Dive Using Java, i of the comprehensive course of pedagogy which covers most of the essential information structures in addition to algorithms.

Steps to detect all leafage nodes inwards a binary tree

Here are the steps yous tin follow to impress all leafage nodes of a binary tree:

1. If give tree node or source is zero thence return
2. impress the node if both correct in addition to left tree is null, that's your leafage node
3. repeat the procedure amongst both left in addition to correct subtree

And, hither is our Java method to implement this logic into code:

  public static void printLeaves(TreeNode node) {     // base of operations case     if (node == null) {       return;     }      if (node.isLeaf()) {       System.out.printf("%s ", node.value);     }      printLeaves(node.left);     printLeaves(node.right);    }

You tin run across that this method convey a TreeNode, which is zip but our shape to stand upward for a binary tree node. It contains a value in addition to reference to ii other nodes, left in addition to right.

In lodge to start processing, yous piece of employment past times the source node to this method. It thence checks if its null or not, if non thence it farther checks if it's a leafage node or not, if yes, thence its impress the value of the node in addition to repeat the procedure amongst left in addition to correct subtree.


This is where recursion is useful because yous telephone phone the printLeaves() method i time again amongst left in addition to correct node. The logic to cheque if a node is a leafage or non is simple, if both left in addition to correct children of that node are zero thence it's a leafage node. This logic is encapsulated inwards the isLeaf() method of the TreeNode class.

Btw, if yous handle amongst algorithms in addition to recursion, I would similar to innovate yous to a novel algorithm mass called Grokking Algorithms past times Aditya Bhargava. I only bought a re-create of this mass in addition to I am happy to tell it made agreement algorithms quite easy.

So, if yous are similar many programmers who empathize recursion, but don't know how to come upward up amongst a recursive solution to a problem, thence yous must read this mass to amend your understanding.

If yous prefer online courses to a greater extent than than books, which many developers create nowadays, thence yous tin equally good checkout here.


Further Learning
Data Structures in addition to Algorithms: Deep Dive Using Java
solution)

How to implement pre-order traversal inwards Java?  (solution)

How to implement in-order traversal inwards Java without recursion? (solution)

How to traverse a binary tree inwards pre-order without using recursion? (solution)

5 Books to create information construction in addition to algorithm for programming/coding interviews (list)

How to implement a binary search tree inwards Java? (program)

How to detect the tertiary chemical component division from the cease of a linked listing inwards Java? (solution)

How to detect the nub chemical component division of the linked listing using a unmarried pass? (solution)

How to contrary a singly linked listing inwards Java? (solution)

How to implement a linked listing using generics inwards Java? (solution)

How to impress duplicate elements of an array inwards Java? (solution)

Thanks for reading this article thence far. If yous similar this coding interview enquiry thence delight part amongst your friend in addition to colleagues. If yous conduct keep whatever dubiety or feedback thence delight driblet a note. You tin equally good follow me on Twitter (javinpaul).