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Grokking the Coding Interview Patterns in C++

Binary Tree Right Side View

Explore how to find the right-side view of a binary tree by applying depth-first search techniques. This lesson helps you understand how to identify which nodes are visible from the right, practicing key concepts in tree traversal and node visibility.

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Statement

You are given a root of a binary tree that has n number of nodes. You have to return the right-side view in the form of a list.

A right-side view of a binary tree is the data of the nodes that are visible when the tree is viewed from the right side.

Constraints:

  • 0≤0 \leq n ≤100\leq 100
  • −100≤-100 \leq Node.data ≤100\leq 100

Examples

Understand the problem

Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

Binary Tree Right Side View

1.

What will be the output of the following tree?

      ______ 1 ______ 
     |               |
     2 _           _ 3  
        |         |
      _ 4 _       5 
     |     |  
     6     7
A.

[1, 3, 5, 7]

B.

[1, 3, 5]

C.

[1, 4, 5, 7]

D.

[1, 2, 3, 5]

1 / 3

Figure it out!

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Sequence - Vertical
Drag and drop the cards to rearrange them in the correct sequence.
1
2
3
4
5

Try it yourself

Implement your solution in the following coding playground.

Need a nudge?

Explore these hints—each one is designed to guide you a step closer to the solution.

C++
usercode > main.cpp
// Definition for a binary tree node

// template<class T>

// class TreeNode {

// public:

//     T data;

//     TreeNode<T>* left;

//     TreeNode<T>* right;



//     TreeNode(const T data) : data(data), left(nullptr), right(nullptr) {}

// };



// Function to get the right side view of a binary tree

std::vector<int> RightSideView(TreeNode<int>* root) {



    // Replace this placeholder return statement with your code

    return {};

}
Binary Tree Right Side View