Right View of Binary Tree in Java | Explained with Example, Algorithm & Interview Questions

 

If you are preparing for the technical interview then prepare this question . It is one of the most asked question in the interviews. In this problem you are given a binary tree and you have to print the right view of this tree. Suppose if this is our binary tree

Then our output must be : 1 3 6

Because if we are at the right hand side of the tree then we can only see 1 3 and 6 .

Number of Weak Characters 

Java Code :

class Node{

int data;

Node left;

Node right;

Node(int data){

this.data=data;

this.left=null;

this.right=null;

}

}

class HindiCodingCommunity{

public static int maxLevel=0;

public static void printRight(Node root,int level){

if(root==null){

return;

}

if(maxLevel<level){

System.out.println(root.data+" ");

maxLevel=level;

}

printRight(root.right,level+1);

printRight(root.left,level+1);

}

public static void printRightView(Node root){

printRight(root,1);

}

public static void main(String args[])

{

Node root = new Node(1);

root.left = new Node(2);

root.right= new Node(3);

root.left.left= new Node(4);

root.right.left= new Node(5);

root.right.right= new Node(6);

printRightView(root);

}

}

Why Do We Traverse Right First?

This is the most important concept in the solution.

Normally tree traversals often go:

```
Root → Left → Right
```

But for the Right View problem, we need:

```
Root → Right → Left
```

Why?

Because the first node encountered at every level from the right side is the node visible in the right view.

If we visit the left side first, we may incorrectly print left-side nodes.

Robotics Programming Guide

Real-World Applications of Binary Tree Views

Many students wonder whether tree view problems are useful in real-world software development.

The answer is yes.


1. Computer Graphics

When rendering a scene, only visible objects should be displayed.

The concept of viewing visible nodes from a particular direction is similar to determining visible objects in graphics engines.


2. Network Visualization

Large network structures are often represented as trees.

Administrators may need to view only the most significant nodes from a particular perspective.


3. Organizational Hierarchy Systems

Companies often store employee structures as trees.

Certain dashboards show only top-level visible managers based on specific viewing criteria.


4. File System Navigation

Operating systems store directories in a hierarchical tree structure.

Tree views help determine what should be visible at different levels.


5. AI Decision Trees

Machine Learning models often use decision trees.

Understanding tree traversal and visibility helps developers work with tree-based algorithms.

System Calls in OS

Alternative Approach Using Level Order Traversal

Another way to solve the problem is using:

* Queue
* Breadth First Search (BFS)

For every level:

1. Traverse all nodes.
2. Store the last node of that level.
3. Print it.

This approach is also popular in interviews.

However, the recursive DFS solution is generally preferred because it is elegant and easier to understand.

Why is this Question Asked in Interviews?

Interviewers ask this question because it tests multiple concepts at the same time:

* Recursion
* Tree Traversal
* Depth First Search (DFS)
* Level Order Understanding
* Binary Tree Fundamentals
* Problem Solving Skills

Many companies use this question to evaluate whether a candidate understands how tree structures work.

Readers Writers Problem

Common Interview Questions Related to Tree Views

After learning Right View, interviewers often ask:

1. Left View of Binary Tree

Print nodes visible from the left side.

Example:

```
1 2 4
```

2. Top View of Binary Tree

Print nodes visible from the top.

 

3. Bottom View of Binary Tree

Print nodes visible from the bottom.



4. Boundary Traversal

Print:

* Left Boundary
* Leaf Nodes
* Right Boundary
 

5. Vertical Order Traversal

Group nodes according to their horizontal distance.

These questions are frequently asked together in coding interviews.

Interview Tips

When solving this problem in an interview:

1. Draw the tree first.
2. Explain your approach before coding.
3. Mention why right traversal is performed before left traversal.
4. Discuss time complexity.
5. Discuss space complexity.
6. Mention BFS as an alternative solution.

Doing this demonstrates strong problem-solving skills and leaves a positive impression on the interviewer.

Dining Philosophers Problem

Conclusion

The Right View of Binary Tree is one of the most important Binary Tree interview questions asked in software engineering interviews. The objective is to print the nodes visible when the tree is viewed from the right side.

The recursive solution works by traversing the right subtree before the left subtree and printing the first node encountered at every level. Since each node is visited only once, the solution runs efficiently in O(N) time complexity.

If you are preparing for coding interviews, mastering problems such as Right View, Left View, Top View, Bottom View, and Boundary Traversal will significantly improve your understanding of binary trees and help you perform better in DSA interview rounds.