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Comparison between Height Balanced Tree and Weight Balanced Tree

by admin
4 years ago
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What’s Peak Balanced Tree?

Self-Balancing binary search timber are the height-balanced binary tree is one for which at each node, absolutely the worth of the distinction in heights of the left and proper subtree is not any bigger than one. An empty tree is height-balanced. A non-empty binary tree T is balanced if:  

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  1. The left subtree of T is balanced.
  2. The best subtree of T is balanced.
  3. The distinction between the heights of the left subtree and the precise subtree isn’t greater than 1.

Notice: 

Each full binary tree is height-balanced.

Instance: 

Purple Black Tree, Splay Tree, and an AVL Tree is height-balanced binary search tree.

Height balanced tree

What’s Weight Balanced Binary Tree?

A weight-balanced tree is a binary tree during which for every node the variety of nodes within the left subtree is not less than half and at most twice the variety of nodes in the precise subtree.  It’s a binary tree that’s balanced based mostly on the data of the chances of trying to find every particular person node. In every sub-tree, the node with the best weight seems on the root thereby leading to extra environment friendly looking out efficiency. The nodes that are most probably to be searched/accessed have the bottom search time.

Instance:

Huffman Tree.

Weight balanced tree

Within the above diagram, the letters characterize the node values and the numbers characterize node weights.

Why totally different definitions of balanced

Binary Search Tree (BST) was invented to make looking out a extra environment friendly course of, than looking out in an unordered array. Nevertheless, when the BST is unbalanced then that case looking out was inefficient. For environment friendly looking out, it’s advisable to maintain the tree balanced. However it’s troublesome and inefficient to maintain a BST balanced because the values are added and deleted continuously. Thus, a method was invented to maintain the BST balanced by including extra info to every node or by permitting a node to have greater than two youngsters. A few of the examples of such invented timber have been AVL Tree, 2-3 Tree, B-Tree, Purple-Black Tree, and many others.

Comparability of Peak Balanced and Weight Balanced Tree

A height-balanced tree improves the worst-case lookup time (for a binary tree, it would all the time be bounded by log2(n)), on the expense of constructing the everyday case roughly one lookup much less (roughly half of the nodes shall be on the most depth).

In case your weight is said to frequency-of-lookup, a weight-balanced tree will enhance the common lookup time, on the expense of constructing the worst-case increased (extra continuously requested objects have the next weight, and can thus are usually in shallower timber, with the associated fee being deeper timber for less-frequently-requested objects).

S No. Peak Balanced Tree Weight Balanced Tree
1 It’s the binary tree that’s balanced based mostly on the peak of the subtrees. It’s the binary tree that’s balanced based mostly on the burden on the sides of the tree.
2 In a height-balanced tree, absolutely the distinction of top of the left subtree and the precise subtree needs to be minimal. In weight balanced tree, absolutely the distinction between the burden of the left subtree and the precise subtree needs to be minimal.
3 It is going to enhance the worst-case lookup time on the expense of constructing a typical case roughly one lookup much less It is going to enhance the common lookup time on the expense of constructing the worst-case increased.
4 The restructuring operation on a node with n descendants occurs each 2-O(lg n) operation. The restructuring operation on a node with n descendants occurs each O(1/n) operation.

Which one is greatest?

One of the best ways to find out which is the very best binary search tree out of the 2 is to measure the efficiency of the 2 timber. This may be completed within the following steps:

  1. Collect consultant question site visitors.
  2. Construct a check rig the place one can rely the tree operations.
  3. Replay the canned queries in opposition to each a height-balanced and a weight-balanced tree.

As a common rule, a height-balanced tree would work higher the extra even the request frequencies are throughout the info set, and the extra skewed it’s, the extra benefit one can get from a weight-balanced tree.



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