# Tree Properties (size vs height) Balanced Binary Trees

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1 Tree Properties (size vs height) Balanced Binary Trees

2 Due now: WA 7 (This is the end of the grace period). Note that a grace period takes the place of a late day. Now is the last time you can turn this in for credit. Due at the beginning of Day 17: OO Queens exercise from Day 15 class Due at the beginning of Day 18: WA8 Sliding Blocks Milestone 1 I eliminated the NameThatSort proramming problem, to leave you more time to work on SlidingBlocks and Scrabble.

3 Touch Base with your SlidingBlocks partner. Height vs size of binary trees The need for balanced trees Keeping trees completely balanced Height-Balanced (H-B) trees

4 WA8 Exhaustive search & Backtracking Sliding Blocks Problem Anything else

5 public static BinaryNode buildfrompreorderinorder(string pre, String in) { if (pre.length() == in.length()) return prein(pre, in); throw new IllegalArgumentException(); } private static BinaryNode prein(string pre, String in) { if (pre.equals("")) return null; char rootchar = pre.charat(0); int rootpos = in.indexof(rootchar); return new BinaryNode(rootChar, prein(pre.substring(1, rootpos+1), in.substring(0, rootpos)), prein(pre.substring(rootpos+1), in.substring(rootpos+1))); }

6 Size vs Height

7 A Binary Tree is either empty, or consists of: a distinguished node called the root, which contains an element and two disjoint subtrees A left subtree T L, which is a binary tree root A right subtree T R, which is a binary tree T L T R

8 Figure Recursive view of the node height calculation: H T = Max (H L + 1, H R + 1) Data Structures & Problem Solving using JAVA/2E Mark Allen Weiss 2002 Addison Wesley

9 If T is a tree, we'll often write h(t) for the height of the tree, and N(T) for the number of nodes in the tree For a particular h(t), what are the upper and lower bounds on N(T)? Lower: N(T) Upper N(T) (prove it by induction) (prove it by induction) Thus N(T). Write bounds for h(t) in terms of N(T) Thus h(t).

10 A tree with the maximum number of nodes for its height is a full tree. Its height is O(log N) A tree with the minimum number of nodes for its height is essentially a. Its height is O(N) Height matters! We saw that the algorithms for search, insertion, and deletion in a Binary Search Tree are O(h(T))

11

12 Review: Efficiency of insertion, deletion, find for Array list Linked list BST insertion algorithm O(height of tree) BST deletion algorithm O(height of tree) BST search algorithm - O(height of tree) Efficiency (worst case)? Can we get a better bound? What about balancing the tree each time? What do we mean by completely balanced? Insert E C G B D F A into a tree in that order. What is the problem? How might we do better? (less is more!)

13 We'd like the worst-case time for find, insert, and delete to be O(log N). The running time for find, insert, and delete are all proportional to the height of the tree. Height of the tree can vary from log N to N. Keeping the tree completely balanced is too expensive. Can require O(N) time to rebalance after insertion or deletion. Height-balanced trees may provide a solution. A BST T is height balanced if T is empty, or if height( T L ) - height( T R ) 1, and T L and T R are both height-balanced. What can we say about the maximum height of an height-balanced tree with N nodes? Details: next slide heightbalanced? Why do we use absolute value in the formula?

14 We want to calculate the maximum height of a height-balanced tree with N nodes. It s not the shortest possible tree, but how close is it? We first look at the dual concept: find the minimum number of nodes in a HB tree of height h. Make a table of heights and # of nodes. What can we say in general about height as a function of number of nodes?

15 Named for authors of original paper, Adelson-Velskii and Landis (1962). It is a height-balanced Binary Search Tree. Recall: A BST T is height balanced if T is empty, or if height( T L ) - height( T R ) 1, and T L and T R are both height-balanced. Maximum height of an AVL tree with N nodes is O(log N).

16 For a Binary Search Tree (BST), worst-case for insert, delete, and find operations are all O(height of tree). Height of tree can vary from O(log N) to O(N). We showed that the height of a height-balanced tree is always O(log N). Thus all three operations will be O(log N) if we can rebalance after insert or delete in time O(log N)

17 An AVL tree is 1. height-balanced 2. a Binary search tree We saw that the maximum height of an AVL tree with N nodes is O(log n). We want to show that after an insertion or deletion (also O(log n) since the height is O(log n)), we can rebalance the tree in O(log n) time. If that is true, then find, insert, and remove, will all be O(Log N). An extra field is needed in each node in order to achieve this speed. Values: / = \ We call this field the balance code. The balance code could be represented by only two bits.

18 Assume that the tree is height-balanced before the insertion. Start at the inserted node (always a leaf). Move back up the tree to the first (lowest) node (if any) where the heights of its subtrees now differ by more than one. We ll call that node A in our diagrams. Do the appropriate single or double rotation to balance the subtree whose root is at this node. If a rotation is needed, we will see that the combination of the insertion and rotation leaves this subtree with the same height that it had before insertion. So why is the algorithm O(log N)?

19 Depends on the first two links in the path from the node with the imbalance (A) down to the newly-inserted node. First link (down from A) Second link (down from A's child) Rotation type (rotate "around A's position") Left Left Single right Left Right Double right Right Right Single left Right Left Double left

20 Diagrams are from Data Structures by E.M. Reingold and W.J. Hansen.

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