Lecture notes data structures tree
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The document discusses different types of tree data structures, including general trees, binary trees, binary search trees, and their traversal methods. General trees allow nodes to have any number of children, while binary trees restrict nodes to having 0, 1, or 2 children. Binary search trees organize nodes so that all left descendants are less than the parent and all right descendants are greater. Common traversal orders for trees include preorder, inorder, and postorder, which differ in whether they process the root node before or after visiting child nodes.
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![D A T A S T R U C T U R E S
Preorder Traversal:
Algorithm: PREORDER (pRoot)
First time this function is called by passing original root into pRoot.
Here pRoot is pointers pointing to current root. This algorithm does a
preorder traversal of T, applying by rcurrsively calling same function
and updating proot to traverse in a way i.e. (NLR) Node, Left, Right.
1. If (pRoot NOT = NULL) then: [ does child exist ?]
i- Apply PROCESS to pRoot-> info. e.g. Write: pRoot -> info
[ recursive call by passing address of left child to update pRoot]
ii- PREORDER (pRoot -> Left)
[ recursive call by passing address of right child to update pRoot]
iii- PREORDER( pRoot -> Right)
[End of If structure.]
2. Exit.
Inorder Traversal:
Algorithm: INORDER (pRoot)
First time this function is called by passing original root into pRoot.
Here pRoot is pointers pointing to current root. This algorithm does a
Inorder traversal of T, applying by rcurrsively calling same function
and updating proot to traverse in a way i.e. (LNR) Left, Node, Right.
1. If (pRoot NOT = NULL) then: [ does child exist ?]
[ recursive call by passing address of left child to update pRoot]
i- PREORDER (pRoot -> Left)
ii- Apply PROCESS to pRoot-> info. e.g. Write: pRoot -> info
[ recursive call by passing address of right child to update pRoot]
iii- PREORDER( pRoot ->
Right) [End of If structure.]
2. Exit.
Postorder Traversal:
Algorithm: POSTORDER (pRoot)
First time this function is called by passing original root into pRoot.
Here pRoot is pointers pointing to current root. This algorithm does a
Postorder traversal of T, applying by rcurrsively calling same function
and updating proot to traverse in a way i.e. (LRN) Left, Right, Node.
1. If (pRoot NOT = NULL) then: [ does child exist ?]
[ recursive call by passing address of left child to update pRoot]
i- PREORDER (pRoot -> Left)
[ recursive call by passing address of right child to update pRoot]
ii- PREORDER( pRoot -> Right)
iii- Apply PROCESS to pRoot-> info. e.g. Write: pRoot -> info
[End of If structure.]
2. Exit.](https://image.slidesharecdn.com/lecturenotesdatastructures7-tree-161223151955/85/Lecture-notes-data-structures-tree-6-320.jpg)
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Chalukyas of Gujrat, Solanki Dynasty NEP.pptxDr. Ravi Shankar Arya Mahila P. G. College, Banaras Hindu University, Varanasi, India.
Lecture notes data structures tree
- 1. D A T A S T R U C T U R E S Tree: So far, we have been studying mainly linear types of data structures: arrays, lists, stacks and queues. Now we defines a nonlinear data structure called Tree. This structure is mainly used to represent data containing a hierarchical relationship between nodes/elements e.g. family trees and tables of contents. There are two main types of tree: General Tree Binary Tree General Tree: A tree where a node can has any number of children / descendants is called General Tree. For example: Following figure is an example of general tree where root is “Desktop”.
- 2. D A T A S T R U C T U R E S Binary Tree: A tree in which each element may has 0-child , 1-child or maximum of 2-children. A Binary Tree T is defined as finite set of elements, called nodes, such that: a) T is empty (called the null tree or empty tree.) b) T contains a distinguished node R, called the root of T, and the remaining nodes of T form an ordered pair of disjoint binary trees T1 and T2. If T does contain a root R, then the two trees T1 and T2 are called, respectively, the left sub tree and right sub tree of R.
- 3. D A T A S T R U C T U R E S If T1 is non empty, then its node is called the left successor of R; similarly, if T 2 is non empty, then its node is called the right successor of R. The nodes with no successors are called the terminal nodes. If N is a node in T with left successor S1 and right successor S2, then N is called the parent(or father) of S1 and S2. Analogously, S1 is called the left child (or son) of N, and S 2 is called the right child (or son) of N. Furthermore, S1 and S2 are said to siblings (or brothers). Every node in the binary tree T, except the root, has a unique parent, called the predecessor of N. The line drawn from a node N of T to a successor is called an edge, and a sequence of consecutive edges is called a path. A terminal node is called a leaves, and a path ending in a leaves is called a branch. The depth (or height) of a tree T is the maximum number of nodes in a branch of T. This turns out to be 1 more than the largest level number of T. Level of node & its generation: Each node in binary tree T is assigned a level number, as follows. The root R of the tree T is assigned the level number 0, and every other node is assigned a level number which is 1 more than the level number of its parent. Furthermore, those nodes with the same level number are said to belong to the same generation.
- 4. D A T A S T R U C T U R E S Complete Binary Tree: Consider a binary tree T. each node of T can have at most two children. Accordingly, one can show that level n-2 of T can have at most two nodes. A tree is said to be complete if all its levels, except possibly the last have the maximum number of possible nodes, and if all the nodes at the last level appear as far left as possible. A B E F G L M N O P Extended Binary Tree: 2-Tree: A binary tree T is said to be a 2-tree or an extended binary tree if each node N has either 0 or 2 children. In such a case, the nodes, with 2 children are called internal nodes, and the node with 0 children are called external node. A A B B Binary Tree Extended 2-tree
- 5. D A T A S T R U C T U R E S Traversing of Binary Tree: A traversal of a tree T is a systematic way of accessing or visiting all the node of T. There are three standard ways of traversing a binary tree T with root R. these are : Preorder (N L R): a) Process the node/root. (A B D F I C G H J L K) b) Traverse the Left sub tree. c) Traverse the Right sub tree. Inorder (L N R): ( D B I F A G C L J H K ) a) Traverse the Left sub tree. b) Process the node/root. c) Traverse the Right sub tree. Postorder (L R N): ( D I F B G L J K H C A ) a) Traverse the Left sub tree. b) Traverse the Right sub tree. c) Process the node/root. Descending order (R N L): ( K H J L C G A F I B D ) (Used in Binary Search Tree, will be discussed later) a) Traverse the Right sub tree. b) Process the node/root. c) Traverse the Left sub tree.
- 6. D A T A S T R U C T U R E S Preorder Traversal: Algorithm: PREORDER (pRoot) First time this function is called by passing original root into pRoot. Here pRoot is pointers pointing to current root. This algorithm does a preorder traversal of T, applying by rcurrsively calling same function and updating proot to traverse in a way i.e. (NLR) Node, Left, Right. 1. If (pRoot NOT = NULL) then: [ does child exist ?] i- Apply PROCESS to pRoot-> info. e.g. Write: pRoot -> info [ recursive call by passing address of left child to update pRoot] ii- PREORDER (pRoot -> Left) [ recursive call by passing address of right child to update pRoot] iii- PREORDER( pRoot -> Right) [End of If structure.] 2. Exit. Inorder Traversal: Algorithm: INORDER (pRoot) First time this function is called by passing original root into pRoot. Here pRoot is pointers pointing to current root. This algorithm does a Inorder traversal of T, applying by rcurrsively calling same function and updating proot to traverse in a way i.e. (LNR) Left, Node, Right. 1. If (pRoot NOT = NULL) then: [ does child exist ?] [ recursive call by passing address of left child to update pRoot] i- PREORDER (pRoot -> Left) ii- Apply PROCESS to pRoot-> info. e.g. Write: pRoot -> info [ recursive call by passing address of right child to update pRoot] iii- PREORDER( pRoot -> Right) [End of If structure.] 2. Exit. Postorder Traversal: Algorithm: POSTORDER (pRoot) First time this function is called by passing original root into pRoot. Here pRoot is pointers pointing to current root. This algorithm does a Postorder traversal of T, applying by rcurrsively calling same function and updating proot to traverse in a way i.e. (LRN) Left, Right, Node. 1. If (pRoot NOT = NULL) then: [ does child exist ?] [ recursive call by passing address of left child to update pRoot] i- PREORDER (pRoot -> Left) [ recursive call by passing address of right child to update pRoot] ii- PREORDER( pRoot -> Right) iii- Apply PROCESS to pRoot-> info. e.g. Write: pRoot -> info [End of If structure.] 2. Exit.
- 7. D A T A S T R U C T U R E S Preparing a Tree from an infix arithmetic expression Recursion: For implementing tree traversal logics as stated, two approaches are used, i.e. use stacks or recursive functions. Recursion is an important concept in computer science. Many algorithms can be best described in terms of recursion. A recursive function / procedure containing a Call statement to itself. To make a function recursive one must consider the following properties: (1) There must be certain (using arguments), called base criteria, for which the procedure / function does not call itself. (2) Each time the procedure / function does call itself, control must be closer to the base criteria.
- 8. D A T A S T R U C T U R E S Binary Search Tree: Suppose T is a binary tree, the T is called a binary search tree or binary sorted tree if each node N of T has the following property: The values of at N (node) is greater than every value in the left sub tree of N and is less than every value in the right sub tree of N. Binary Search Tree using these values: (50, 30, 55, 25, 10, 35, 37, 31, 20, 53, 60, 62) 50 30 55 25 35 53 60 10 62 31 37 20 Following figure shows a binary search tree. Notice that this tree is obtained by inserting the values 13, 3, 4, 12, 14, 10, 5, 1, 8, 2, 7, 9, 11, 6, 18 in that order, starting from an empty tree.
- 9. D A T A S T R U C T U R E S Sorting: Note that inorder traversal of a binary search tree always gives a sorted sequence of the values. This is a direct consequence of the BST property. This provides a way of sorting a given sequence of keys: first, create a BST with these keys and then do an inorder traversal of the BST so created. Inorder Travers (LNR) : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 18 Search: is straightforward in a BST. Start with the root and keep moving left or right using the BST property. If the key we are seeking is present, this search procedure will lead us to the key. If the key is not present, we end up in a null link. Insertion in a BST is also a straightforward operation. If we need to insert an element n, we traverse tree starting from root by considering the above stated rules. Our traverse procedure ends in a null link. It is at this position of this null link that n will be included. . Deletion in BST: Let x be a value to be deleted from the BST and let N denote the node containing the value x. Deletion of an element in a BST again uses the BST property in a critical way. When we delete the node N containing x, it would create a "gap" that should be filled by a suitable existing node of the BST. There are two possible candidate nodes that can fill this gap, in a way that the BST property is not violated: (1). Node containing highest valued element among all descendants of left child of N. (2). Node containing the lowest valued element among all the descendants of the right child of N. There are three possible cases to consider: Deleting a leaf (node with no children): Deleting a leaf is easy, as we can simply remove it from the tree. Deleting a node with one child: Delete it and replace it with its child. Deleting a node with two children: Call the node to be deleted "N". Do not delete N. Instead, choose its in-order successor node "S". Replace the value of “N” with the value of “S”. (Note: S itself has up to one child.) As with all binary trees, a node's in-order successor is the left-most child of its right subtree. This node will have zero or one child. Delete it according to one of the two simpler cases above. Figure on next page illustrates several scenarios for deletion in BSTs.
- 10. D A T A S T R U C T U R E S