What Is Right Rotation in Data Structure?


Heather Bennett

Rotation is a fundamental operation in data structures that plays a crucial role in maintaining balance and optimizing various algorithms. In this article, we will explore the concept of right rotation, its implementation, and its significance.

What Is Right Rotation?

In simple terms, right rotation is an operation performed on a binary tree to restructure it by moving one node from the left subtree to the right subtree. This operation helps maintain the balance of the tree and can be applied to different types of binary trees such as AVL trees, red-black trees, and splay trees.

How Does Right Rotation Work?

To understand right rotation, let’s consider a binary tree with three nodes: A (the root), B (the left child of A), and C (the right child of B). The goal is to perform a right rotation on node A.

During the right rotation:

  • The left child B becomes the new root
  • The original root A becomes the right child of B
  • The right child of B (C) becomes the left child of the original root A

This restructuring helps maintain the properties and balance of various binary search tree algorithms. It ensures that all nodes on the left subtree have smaller values than those on the right subtree.

Implementation of Right Rotation

Now that we understand what right rotation is and how it works, let’s see how it can be implemented using code. Here’s an example implementation in pseudocode:

   newRoot = root.left
   root.left = newRoot.right
   newRoot.right = root
   return newRoot

This code snippet represents the basic logic of performing a right rotation. However, the actual implementation may vary depending on the type of binary tree and the programming language used.

Significance of Right Rotation

Right rotation is a powerful operation that helps maintain balance in binary trees. It is commonly used in self-balancing binary search trees like AVL trees to ensure efficient insertion, deletion, and search operations.

By performing right rotations when necessary, these trees can maintain a balance factor that allows for faster and more efficient access to data. Without proper balancing, these operations could become slower as the tree becomes more unbalanced.

Additionally, right rotation plays a crucial role in maintaining the integrity of various algorithms that rely on balanced binary trees. This includes algorithms like sorting, searching, and traversing elements in a tree structure.


In summary, right rotation is an essential operation in data structures that allows us to restructure binary trees efficiently. By moving nodes from the left subtree to the right subtree, we can maintain balance and optimize various algorithms. Understanding this concept is crucial for anyone working with data structures and algorithms.

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