What if the input to binary search tree comes in a sorted ascending or descending manner? In real-time data, we cannot predict data pattern and their frequencies. So, a need arises to balance out the existing BST. AVL tree checks the height of the left and the right sub-trees and assures that the difference is not more than 1. This difference is called the Balance Factor.

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An AVL tree is a subtype of binary search tree. Named after it's inventors Adelson, Velskii and Landis, AVL trees have the property of dynamic self-balancing in addition to all the properties exhibited by binary search trees.

You will do an insertion similar to a normal Binary Search Tree insertion. After inserting, you fix the AVL property using left or right rotations. An AVL tree is a self-balancing binary search tree. AVL tree checks the height of the left and the right sub-trees and assures that the difference is not more than 1. This difference is called the Balance Factor. In AVL tree, after performing every operation like insertion and deletion we need to check the balance factor of every node in the tree.

If every node satisfies the balance factor condition then we conclude the operation otherwise we must make it balanced. We use rotation operations to make the tree balanced whenever the tree is becoming imbalanced due to any operation. Rotation operations are used to make a tree balanced. There are four rotations and they are classified into two types:. The LR Rotation is combination of single left rotation followed by single right rotation.

In LR Rotation, first every node moves one position to left then one position to right from the current position. The RL Rotation is combination of single right rotation followed by single left rotation. In RL Rotation, first every node moves one position to right then one position to left from the current position.

AVL trees are beneficial in the cases where you are designing some database where insertions and deletions are not that frequent but you have to frequently look-up for the items present in there.

If this article was helpful, tweet it. Learn to code for free. Get started. Stay safe, friends. Learn to code from home. Use our free 2, hour curriculum. What is an AVL Tree? A BST is a data structure composed of nodes. It has the following guarantees: Each tree has a root node at the top.

The root node has zero, one or two child nodes. Each child node has zero, one or two child nodes, and so on. Each node has up to two children. For each node, its left descendants are less than the current node, which is less than the right descendants. AVL trees have an additional guarantee: The difference between the depth of right and left subtrees cannot be more than one. In order to maintain this guarantee, an implementation of an AVL will include an algorithm to rebalance the tree when adding an additional element would upset this guarantee.

AVL trees have a worst case lookup, insert and delete time of O log n. If there is an imbalance in left child of right subtree, then you perform a left-right rotation. If there is an imbalance in left child of left subtree, then you perform a right rotation. If there is an imbalance in right child of right subtree, then you perform a left rotation. If there is an imbalance in right child of left subtree, then you perform a right-left rotation. AVL Tree Rotations In AVL tree, after performing every operation like insertion and deletion we need to check the balance factor of every node in the tree.

Algorithm Average Worst case: Space: O n , Time: O n Application of AVL Trees AVL trees are beneficial in the cases where you are designing some database where insertions and deletions are not that frequent but you have to frequently look-up for the items present in there.

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## AVL Tree Insertion, Rotation, and Balance Factor Explained

AVL tree is a self-balancing Binary Search Tree BST where the difference between heights of left and right subtrees cannot be more than one for all nodes. Why AVL Trees? Most of the BST operations e. The cost of these operations may become O n for a skewed Binary tree. If we make sure that height of the tree remains O Logn after every insertion and deletion, then we can guarantee an upper bound of O Logn for all these operations. The height of an AVL tree is always O Logn where n is the number of nodes in the tree See this video lecture for proof.

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## Data Structure and Algorithms - AVL Trees

In computer science , an AVL tree named after inventors A delson- V elsky and L andis is a self-balancing binary search tree. It was the first such data structure to be invented. Insertions and deletions may require the tree to be rebalanced by one or more tree rotations. The AVL tree is named after its two Soviet inventors, Georgy Adelson-Velsky and Evgenii Landis , who published it in their paper "An algorithm for the organization of information". For lookup-intensive applications, AVL trees are faster than redâ€”black trees because they are more strictly balanced. A binary tree is defined to be an AVL tree if the invariant.

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## AVL Tree | Set 1 (Insertion)

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