## What is AVL tree with give example?

AVL Tree can be defined as height balanced binary search tree in which each node is associated with a balance factor which is calculated by subtracting the height of its right sub-tree from that of its left sub-tree….Complexity.

Algorithm | Average case | Worst case |
---|---|---|

Insert | o(log n) | o(log n) |

Delete | o(log n) | o(log n) |

## How can we define a AVL tree?

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. An Example Tree that is an AVL Tree. The above tree is AVL because differences between heights of left and right subtrees for every node is less than or equal to 1 …

**How useful is AVL tree in programming?**

So, a need arises to balance out the existing BST. Named after their inventor Adelson, Velski & Landis, AVL trees are height 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.

### Where AVL tree is used?

Applications Of AVL Trees AVL trees are mostly used for in-memory sorts of sets and dictionaries. AVL trees are also used extensively in database applications in which insertions and deletions are fewer but there are frequent lookups for data required.

### What is balance factor?

DEFINITION: The balance factor of a binary tree is the difference in heights of its two subtrees (hR – hL). The balance factor (bf) of a height balanced binary tree may take on one of the values -1, 0, +1. An AVL node is “leftheavy” when bf = 1, “equalheight” when bf = 0, and “rightheavy” when bf = +1.

**What is the balance factor in case of AVL tree?**

Properties of an AVL tree: The balance factor of a node is the height of its right subtree minus the height of its left subtree and a node with a balance factor 1, 0, or -1 is considered balanced.

## How does AVL tree differ from BST?

In BST, there is no term exists, such as balance factor. In the AVL tree, each node contains a balance factor, and the value of the balance factor must be either -1, 0, or 1. Every Binary Search tree is not an AVL tree because BST could be either a balanced or an unbalanced tree.

## Why are AVL trees better?

AVL tree is also a BST but it can rebalance itself. This behavior makes it faster in worst cases. It keeps rebalancing itself so in worst case it will consume O(log n ) time when the plain BST will take O(n). So, the answer to your question: It is always better to implement AVL tree than just plain BST.

**Which is better AVL or BST?**

### How is AVL tree implemented?

AVL tree is a self-balancing Binary Search Tree where the difference between heights of left and right subtrees cannot be more than one for all nodes. Tree rotation is an operation that changes the structure without interfering with the order of the elements on an AVL tree.

### What is the difference between B+ tree and B-tree?

B+ tree is an extension of the B tree. The difference in B+ tree and B tree is that in B tree the keys and records can be stored as internal as well as leaf nodes whereas in B+ trees, the records are stored as leaf nodes and the keys are stored only in internal nodes.