The document discusses various tree data structures and operations including binary trees, binary search trees, and threaded binary trees. It begins with introductions to tree terminology and representations. It then covers properties, traversals, and additional operations for binary trees such as copying and testing equality. Binary search trees and their search operation are discussed next. The document concludes with descriptions of threaded binary trees and how they reduce null pointers.
- A tree is a nonlinear hierarchical data structure that stores elements with parent-child relationships. Common examples include family trees, book tables of contents, and file system directories.
- Trees have nodes connected by edges, with one node designated as the root. Nodes have properties like parents, children, siblings, ancestors, descendants. A tree can be empty or have a root node with zero or more subtrees.
- Tree traversal algorithms like preorder, inorder, and postorder recursively visit each node by following different traversal orders. These are used to search, display, or evaluate information stored in the tree.
This document discusses binary trees and their representations and uses. It defines key terms related to binary trees like nodes, leaves, siblings, and levels. It describes different types of binary trees like complete and extended binary trees. It explains how to represent binary trees in memory using linked and sequential representations. It provides examples of how binary trees can be used to represent expressions and model tournaments. It also discusses algorithms for traversing binary trees in preorder, inorder and postorder sequences.
The document discusses trees and graphs. It begins by defining a tree as a set of nodes where one node is the root and all other nodes can be partitioned into non-empty sub-trees. It then provides terminology for trees such as root node, sub-trees, leaf nodes, paths, ancestors, descendants, levels, and degrees. It describes different types of trees including general trees, forests, binary trees, expression trees, and tournament trees. It also covers linked and sequential representations of binary trees and traversing algorithms for binary trees including pre-order, in-order, post-order, and level-order traversals. Finally, it discusses applications of trees and binary search trees.
1. The document discusses trees as a non-linear data structure that can represent hierarchical relationships. It specifically focuses on binary trees, their basic structure, properties, representations, and converting general trees to binary trees.
2. Binary trees have properties like a root node, leaf nodes, parent and child nodes, as well as left and right subtrees. They can be represented sequentially using arrays or linked lists.
3. General trees can be converted to binary trees by deleting branches except the leftmost one, and drawing new branches from each node to its right neighbor at the same level.
The document discusses binary trees and binary search trees. It begins with definitions of tree, binary tree, and binary search tree. It describes the key properties and terminology used for trees including nodes, degrees, heights, paths, etc. It then covers various tree traversal methods like preorder, inorder and postorder traversal. Operations for binary search trees like searching, insertion and deletion of nodes are explained along with algorithms. Different representations of binary trees using arrays and linked lists are also presented.
The document discusses trees and graphs data structures. It begins with introducing different types of trees like binary trees, binary search trees, threaded binary trees, and their various traversal algorithms like inorder, preorder and postorder traversals. It then discusses tree operations like copying trees, testing for equality. It also covers the satisfiability problem and how binary trees can be used to represent logical expressions to solve this problem. Finally, it discusses threaded binary trees where null links in a binary tree are replaced with threads, and how this allows for efficient inorder traversal in linear time.
This document provides an overview of trees as data structures. It defines tree terminology like nodes, edges, leaves, subtrees, and levels. It describes binary trees and their properties like fullness and completeness. It covers traversing trees using preorder, inorder and postorder traversal orders. It explains implementing binary trees and binary search trees using linked nodes and arrays. It provides pseudocode for searching, inserting and deleting nodes from binary search trees.
The document discusses various tree data structures and their terminology. It begins by defining a tree as a set of nodes connected in a parent-child relationship, with one root node and multiple disjoint subtree structures. Key terminology introduced includes root, child, parent, leaf nodes, siblings, ancestors, and height/depth. Binary trees are defined as having at most two children per node. Common traversal orders of trees - preorder, inorder, and postorder - are explained along with examples. Finally, algorithms for traversing binary trees using stacks are presented for preorder and inorder traversal.
- A tree is a nonlinear hierarchical data structure that stores elements with parent-child relationships. Common examples include family trees, book tables of contents, and file system directories.
- Trees have nodes connected by edges, with one node designated as the root. Nodes have properties like parents, children, siblings, ancestors, descendants. A tree can be empty or have a root node with zero or more subtrees.
- Tree traversal algorithms like preorder, inorder, and postorder recursively visit each node by following different traversal orders. These are used to search, display, or evaluate information stored in the tree.
This document discusses binary trees and their representations and uses. It defines key terms related to binary trees like nodes, leaves, siblings, and levels. It describes different types of binary trees like complete and extended binary trees. It explains how to represent binary trees in memory using linked and sequential representations. It provides examples of how binary trees can be used to represent expressions and model tournaments. It also discusses algorithms for traversing binary trees in preorder, inorder and postorder sequences.
The document discusses trees and graphs. It begins by defining a tree as a set of nodes where one node is the root and all other nodes can be partitioned into non-empty sub-trees. It then provides terminology for trees such as root node, sub-trees, leaf nodes, paths, ancestors, descendants, levels, and degrees. It describes different types of trees including general trees, forests, binary trees, expression trees, and tournament trees. It also covers linked and sequential representations of binary trees and traversing algorithms for binary trees including pre-order, in-order, post-order, and level-order traversals. Finally, it discusses applications of trees and binary search trees.
1. The document discusses trees as a non-linear data structure that can represent hierarchical relationships. It specifically focuses on binary trees, their basic structure, properties, representations, and converting general trees to binary trees.
2. Binary trees have properties like a root node, leaf nodes, parent and child nodes, as well as left and right subtrees. They can be represented sequentially using arrays or linked lists.
3. General trees can be converted to binary trees by deleting branches except the leftmost one, and drawing new branches from each node to its right neighbor at the same level.
The document discusses binary trees and binary search trees. It begins with definitions of tree, binary tree, and binary search tree. It describes the key properties and terminology used for trees including nodes, degrees, heights, paths, etc. It then covers various tree traversal methods like preorder, inorder and postorder traversal. Operations for binary search trees like searching, insertion and deletion of nodes are explained along with algorithms. Different representations of binary trees using arrays and linked lists are also presented.
The document discusses trees and graphs data structures. It begins with introducing different types of trees like binary trees, binary search trees, threaded binary trees, and their various traversal algorithms like inorder, preorder and postorder traversals. It then discusses tree operations like copying trees, testing for equality. It also covers the satisfiability problem and how binary trees can be used to represent logical expressions to solve this problem. Finally, it discusses threaded binary trees where null links in a binary tree are replaced with threads, and how this allows for efficient inorder traversal in linear time.
This document provides an overview of trees as data structures. It defines tree terminology like nodes, edges, leaves, subtrees, and levels. It describes binary trees and their properties like fullness and completeness. It covers traversing trees using preorder, inorder and postorder traversal orders. It explains implementing binary trees and binary search trees using linked nodes and arrays. It provides pseudocode for searching, inserting and deleting nodes from binary search trees.
The document discusses various tree data structures and their terminology. It begins by defining a tree as a set of nodes connected in a parent-child relationship, with one root node and multiple disjoint subtree structures. Key terminology introduced includes root, child, parent, leaf nodes, siblings, ancestors, and height/depth. Binary trees are defined as having at most two children per node. Common traversal orders of trees - preorder, inorder, and postorder - are explained along with examples. Finally, algorithms for traversing binary trees using stacks are presented for preorder and inorder traversal.
This document discusses tree data structures and binary search trees. It begins by defining linear and non-linear data structures, with trees being a non-linear structure. It then defines general tree terminology like root, child, parent, leaves, etc. It describes tree traversal methods like preorder, inorder and postorder. It also discusses binary search trees and basic BST operations like insertion, deletion and searching. Finally, it discusses how BSTs can be used for sorting by inserting elements into a BST and then performing an inorder traversal.
The document discusses binary trees and their implementation. It defines a binary tree as a tree where each node has at most two children. Binary trees are implemented by having each node store the data and pointers to its left and right children. The document also discusses traversing binary trees using preorder, postorder and inorder traversals and provides examples of using these traversals to list files in a directory and calculate their total size. Expression trees are given as an example of binary trees, where leaves are operands and internal nodes are operators. Algorithms are provided to construct expression trees from postfix notation.
This document discusses binary trees. It defines a binary tree as a structure containing nodes with two self-referenced fields - a left reference and a right reference. Each node can have at most two child nodes. It provides examples of common binary tree terminology like root, internal nodes, leaves, siblings, depth, and height. It also describes different ways to represent binary trees using arrays or links and their tradeoffs. Complete binary trees are discussed as an optimal structure with height proportional to log of number of nodes.
The document discusses various tree data structures including binary trees and their terminology. It defines a tree as a set of nodes connected by links/branches where one node is designated as the root. Key terms discussed include child, parent, leaf, root, and level. The document also covers different ways to represent trees using arrays and linked lists and how to traverse trees using preorder, inorder, and postorder traversal algorithms.
This document discusses nonlinear data structures like trees and graphs. It defines trees and graphs, noting that all trees are graphs but not all graphs are trees. It covers topics like binary trees, binary search trees, tree traversal methods, graphs, spanning trees, and minimum spanning trees. Recursion is described as useful for processing trees by keeping track of what has been processed and what remains.
This document provides an introduction to tree data structures. It defines trees formally and describes key tree terminology like nodes, roots, leaves, paths, subtrees and levels. It also covers different types of binary trees like full, perfect and complete binary trees. Finally, it discusses two common ways to represent trees - using linked lists with child pointers or arrays where each node's children are calculated from its index.
This document discusses nonlinear data structures like trees and graphs. It defines trees and graphs, and describes their properties. Specific tree types discussed include binary trees, binary search trees, and n-ary trees. Graphs can be directed or undirected. The document also covers tree traversal methods and discusses searching algorithms for graphs like breadth-first search and depth-first search.
This document discusses nonlinear data structures like trees and graphs. It defines trees and graphs, and notes that all trees are graphs but not all graphs are trees. It then describes different types of trees like binary trees, binary search trees, and n-ary trees. It also covers graph concepts like directed and undirected graphs. The document discusses traversing trees using preorder, inorder and postorder traversal and covers graph searching algorithms like breadth-first search and depth-first search.
- A tree is a connected graph without simple circuits. Properties include a unique path between vertices and no loops or multiple edges.
- Trees can be used to represent hierarchies and organize data. Examples include organizational charts and file systems.
- Binary search trees allow efficient searching through ordered data by storing keys so that all values in the left subtree are less than the root and all values in the right subtree are greater.
- Traversal algorithms like preorder, inorder and postorder visit the vertices of a rooted tree in a systematic way and have applications in parsing expressions and serializing data.
Tree and graph data structures are used to represent hierarchical data. A tree has nodes connected by edges in a parent-child relationship where each node can have zero or more children but only one parent, forming a rooted tree. Common tree types include binary trees where each node has at most two children, binary search trees where the left child is less than the parent which is less than the right child, and B-trees where nodes can have multiple children. Trees are traversed using in-order, pre-order and post-order algorithms.
The document discusses different types of tree traversals including preorder, inorder, postorder, and level order traversal. It provides examples of how to traverse a binary tree using each method and describes their visiting order. Additionally, it discusses applications of trees like binary search trees, expression trees, Huffman coding trees, and using trees to represent sets and perform union/find operations. The Huffman algorithm for data compression is explained in detail with an example.
This document discusses trees and binary trees. It covers tree terminology like root, child, parent, leaf nodes, internal nodes, height, level. It explains different tree traversals like preorder, inorder, postorder traversal and level order traversal. It also discusses binary tree operations and implementations using linked nodes.
Tree is a hierarchical data structure that stores information in a parent-child relationship. There are different types of trees including binary trees, binary search trees, and expression trees. Binary trees restrict each node to having zero, one, or two children while binary search trees further require that all left descendants of a node are less than the node and all right descendants are greater than or equal. Expression trees represent mathematical expressions with operators as internal nodes and operands as leaves.
This document defines and explains the key concepts of binary trees. It begins by defining a binary tree as a collection of nodes where each node contains data and pointers to its left and right children. It describes the root node and how trees can be empty or non-empty. It then explains terms like subtrees, successors, leaf nodes, siblings, levels, and degrees of nodes. The document also covers traversing binary trees using pre-order, in-order, and post-order algorithms and representing binary trees in memory using linked and sequential structures. It concludes with an example of using a binary tree to represent an algebraic expression.
A binary tree is composed of nodes where each node contains a value and pointers to its left and right children. A binary tree traversal involves systematically visiting each node by traversing either breadth-first or depth-first. Breadth-first traversal visits nodes by level while depth-first traversal can be pre-order, in-order, or post-order depending on when the node is visited. Threaded binary trees reduce the number of null pointers by using them to point to other nodes for more efficient traversals.
Trees are useful for representing hierarchically ordered data like directory structures and family trees. A tree is a collection of nodes connected by branches, with each node having at most one parent. It is defined recursively as a root node with zero or more subtrees. Binary trees restrict nodes to having at most two children. Trees can be traversed in preorder, inorder, or postorder. Binary search trees organize nodes to keep all left descendants less than the parent and all right descendants greater than the parent. Graphs generalize trees by allowing many-to-many relationships between nodes.
1. Trees are non-linear data structures that represent hierarchical relationships. They consist of nodes connected by edges, with one node designated as the root.
2. Trees can be represented using arrays or linked lists. Array representation requires knowing the height of the tree in advance, while linked lists do not waste memory but have slower access times.
3. Common tree terminology includes root, leaf nodes, internal nodes, siblings, ancestors, descendants, depth, height, and subtrees. Binary trees restrict nodes to at most two children each.
The document discusses trees and binary trees. Some key points:
- Trees have basic operations like traversals, inserting and deleting nodes, and searching.
- A tree has a root node and hierarchical parent-child relationships between nodes.
- A binary tree restricts each node to have no more than two children. Binary trees can be balanced, complete, or full.
- Tree traversal algorithms like preorder, inorder, and postorder recursively visit nodes in different orders.
This document defines and provides examples of trees and binary trees. It begins by defining trees as hierarchical data structures with nodes and edges. It then provides definitions for terms like path, forest, ordered tree, height, and multiway tree. It specifically defines binary trees as having two children per node. The document gives examples and properties of binary trees, including full, complete, and binary search trees. It also explains linear and linked representations of binary trees and different traversal methods like preorder, postorder and inorder. Finally, it provides examples of insertion and deletion operations in binary search trees.
This document discusses object-oriented databases and concepts. It covers object schemas and their graphical representation, including class hierarchies, relationships between objects, and versioning support. Object-oriented databases provide advantages like more semantic information and extensibility, while disadvantages include a lack of standards and steep learning curve. Object-oriented concepts have influenced the relational model, with extended relational databases now supporting features like user-defined data types, complex objects, and inheritance.
The document describes the conceptual, logical, and physical design and implementation of a university lab database system. It discusses modeling the entity-relationship diagram, creating logical database tables, defining indexes and views, estimating physical storage needs, loading and testing the database, and procedures for operating and maintaining the system. The system models two modules: a lab management system and inventory management system.
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Denis is a dynamic and results-driven Chief Information Officer (CIO) with a distinguished career spanning information systems analysis and technical project management. With a proven track record of spearheading the design and delivery of cutting-edge Information Management solutions, he has consistently elevated business operations, streamlined reporting functions, and maximized process efficiency.
Certified as an ISO/IEC 27001: Information Security Management Systems (ISMS) Lead Implementer, Data Protection Officer, and Cyber Risks Analyst, Denis brings a heightened focus on data security, privacy, and cyber resilience to every endeavor.
His expertise extends across a diverse spectrum of reporting, database, and web development applications, underpinned by an exceptional grasp of data storage and virtualization technologies. His proficiency in application testing, database administration, and data cleansing ensures seamless execution of complex projects.
What sets Denis apart is his comprehensive understanding of Business and Systems Analysis technologies, honed through involvement in all phases of the Software Development Lifecycle (SDLC). From meticulous requirements gathering to precise analysis, innovative design, rigorous development, thorough testing, and successful implementation, he has consistently delivered exceptional results.
Throughout his career, he has taken on multifaceted roles, from leading technical project management teams to owning solutions that drive operational excellence. His conscientious and proactive approach is unwavering, whether he is working independently or collaboratively within a team. His ability to connect with colleagues on a personal level underscores his commitment to fostering a harmonious and productive workplace environment.
Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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How to Setup Warehouse & Location in Odoo 17 InventoryCeline George
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LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
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Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
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9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
Main Java[All of the Base Concepts}.docxadhitya5119
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
1. Module 4- Trees
• Introduction
• Terminology
• Binary Trees
• Properties of binary trees
• Array and Linked representations of binary tree
• Binary Tree Traversals
• Additional Binary Tree Operations
• Threaded Binary Trees
• Binary Search Trees
• Binary Search Trees operations
• Application of Trees-Evaluation of Expression
2. Introduction (1/8)
• A tree structure means that the data are organized so
that items of information are related by branches
• Examples:
3. Introduction (2/8)
• Definition (recursively): A tree is a finite set of one or
more nodes such that
• There is a specially designated node called root.
• The remaining nodes are partitioned into n>=0 disjoint set
T1,…,Tn, where each of these sets is a tree. T1,…,Tn are
called the subtrees of the root.
• Every node in the tree is the root of some subtree
4. Introduction (3/8)
Terminology
• Node: The item of information plus the branches to other nodes
• Degree: The number of subtrees of a node
• Degree of a tree: The maximum of the degree of the nodes in the tree.
• Terminal nodes (or leaf): nodes that have degree zero or node with no
successor
• Nonterminal nodes: nodes that don’t belong to terminal nodes.
• Parent and Children: Suppose 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.
Here, S1 is called left child (or Son) and S2 is called right child (or Son)
of N.
5. Introduction (4/8)
Terminology (cont’d)
• Siblings: Children of the same parent are said to be siblings.
• Edge: A line drawn from node N of a T to a successor is called an
edge
• Path: A sequence of consecutive edges from node N to a node M is
called a path.
• Ancestors of a node: All the nodes along the path from the root to
that node.
• The level of a node: defined by letting the root be at level zero. If a
node is at level l, then it children are at level l+1.
• Height (or depth): The maximum level of any node in the tree
6. Introduction (5/8)
• Example
A is the root node
B is the parent of D and E
C is the sibling of B
D and E are the children of B
D, E, F, G, I are external nodes, or leaves
A, B, C, H are internal nodes
The level of E is 3
The height (depth) of the tree is 4
The degree of node B is 2
The degree of the tree is 3
The ancestors of node I is A, C, H
The descendants of node C is F, G, H, I
A
B C
H
I
D E F G
Level
1
2
3
4
Property: (# edges) = (#nodes) - 1
7. Introduction (6/8)
Representation of Trees
• List Representation
• we can write of Figure 5.2 as a list in which each of the
subtrees is also a list
( A ( B ( E ( K, L ), F ), C ( G ), D ( H ( M ), I, J ) ) )
• The root comes first,
followed by a list of sub-trees
10. Binary Trees (1/8)
• Binary trees are characterized by the fact that any node can have at
most two branches
• Definition (recursive):
• A binary tree is a finite set of nodes that is either empty or
consists of a root and two disjoint binary trees called the left
subtree and the right subtree
• Thus the left subtree and the right subtree are distinguished
• Any tree can be transformed into binary tree
• by left child-right sibling representation
A
B
A
B
11. Binary Trees (2/8)
• Two special kinds of binary trees:
(a) skewed tree, (b) complete binary tree
• The all leaf nodes of these trees are on two adjacent levels
12. Binary Trees (3/8)
Properties of binary trees
Lemma [Maximum number of nodes]:
1. The maximum number of nodes on level i of a binary tree
is 2i-1, i 1.
2. The maximum number of nodes in a binary tree of depth k
is 2k-1, k1
Lemma [Relation between number of leaf nodes and
degree-2 nodes]:
For any nonempty binary tree, T, if n0 is the number of leaf
nodes and n2 is the number of nodes of degree 2, then n0 = n2
+ 1.
These lemmas allow us to define full and complete
binary trees
13. Binary Trees (4/8)
• Definition:
• A full binary tree of depth k is a binary tree of death k having
2k-1 nodes, k 0.
• A binary tree with n nodes and depth k is complete iff its
nodes correspond to the nodes numbered from 1 to n in the
full binary tree of depth k.
• From Lemma 5.1, the
height of a complete
binary tree with n nodes
is log2(n+1)
14. Binary Trees (5/8)
Binary tree representations (using array)
Lemma: If a complete binary tree with n nodes is represented
sequentially, then for any node with index i, 1 i n, we have
1. parent(i) is at i /2 if i 1.
If i = 1, i is at the root and has no parent.
2. LeftChild(i) is at 2i if 2i n.
If 2i n, then i has no left child.
3. RightChild(i) is at 2i+1 if 2i+1 n.
If 2i +1 n, then i has no left child
[1] [2] [3] [4] [5] [6] [7]
A B C — D — E
Level 1
Level 2 Level 3
A
B
D
C
E
1
2 3
4 5 6 7
15. Binary Trees (6/8)
• Binary tree representations (using array)
• Waste spaces: in the worst case, a skewed tree of depth k
requires 2k-1 spaces. Of these, only k spaces will be occupied
• Insertion or deletion
of nodes from the
middle of a tree
requires the
movement of
potentially many nodes
to reflect the change in
the level of these nodes
18. Binary Tree Traversals (1/9)
• How to traverse a tree or visit each node in the tree
exactly once?
• There are six possible combinations of traversal
LVR, LRV, VLR, VRL, RVL, RLV
• Adopt convention that we traverse left before
right, only 3 traversals remain
LVR (inorder), LRV (postorder), VLR (preorder)
data right_child
left_child
L: moving left R: moving right
V
:
visiting
node
19. Binary Tree Traversals (2/9)
• Arithmetic Expression using binary tree
• inorder traversal (infix expression)
A / B * C * D + E
• preorder traversal (prefix expression)
+ * * / A B C D E
• postorder traversal
(postfix expression)
A B / C * D * E +
• level order traversal
+ * E * D / C A B
20. Binary Tree Traversals (3/9)
• Inorder traversal (LVR) (recursive version)
L
V
R
ptr
output: A / B* C * D + E
21. Binary Tree Traversals (4/9)
• Preorder traversal (VLR) (recursive version)
V
L
R
output: A
/ B
* C
* D
+ E
22. Binary Tree Traversals (5/9)
• Postorder traversal (LRV) (recursive version)
L
R
V
output: A /
B *
C * D +
E
23. Binary Tree Traversals (6/9)
• Iterative inorder traversal
• we use a stack to simulate recursion
L
V
R
1
+
node
output: A /B*C *D +E
2
*
3
*
4
/
5
A
8
B
11
C
14
D
17
E
24. Binary Tree Traversals (7/9)
• Analysis of inorder2 (Non-recursive Inorder traversal)
• Let n be the number of nodes in the tree
• Time complexity: O(n)
• Every node of the tree is placed on and removed
from the stack exactly once
• Space complexity: O(n)
• equal to the depth of the tree which
(skewed tree is the worst case)
25. Binary Tree Traversals (8/9)
• Level-order traversal
• method:
• We visit the root first, then the root’s left child, followed by the
root’s right child.
• We continue in this manner, visiting the nodes at each new level
from the leftmost node to the rightmost nodes
• This traversal requires a queue to implement
26. Binary Tree Traversals (9/9)
• Level-order traversal (using queue)
FIFO
1
+
ptr
output: A
/ B
* C
* D
+ E
2
*
17
E
3
*
14
D
4
/
11
C
5
A
8
B
27. Additional Binary Tree Operations (1/7)
• Copying Binary Trees
• we can modify the postorder traversal algorithm only
slightly to copy the binary tree
similar as
Program 5.3
28. Additional Binary Tree Operations (2/7)
• Testing Equality
• Binary trees are equivalent if they have the same topology
and the information in corresponding nodes is identical
the same topology and data as Program 5.6
L
V R
29. Additional Binary Tree Operations (3/7)
• Variables: x1, x2, …, xn can hold only of two possible
values, true or false
• Operators: (and), (or), ¬(not)
• Propositional Calculus Expression
• A variable is an expression
• If x and y are expressions, then ¬x, xy, xy are expressions
• Parentheses can be used to alter the normal order of
evaluation (¬ > > )
• Example: x1 (x2 ¬x3)
30. Additional Binary Tree Operations (4/7)
• Satisfiability problem:
• Is there an assignment to make an expression true?
• Solution for the Example x1 (x2 ¬x3) :
• If x1 and x3 are false and x2 is true
• false (true ¬false) = false true = true
• For n value of an expression, there are 2n possible
combinations of true and false
32. Additional Binary Tree Operations (6/7)
• node structure
• For the purpose of our evaluation algorithm, we assume
each node has four fields:
• We define this node structure in C as:
33. Additional Binary Tree Operations (7/7)
• Satisfiability function
• To evaluate the tree is
easily obtained by
modifying the original
recursive postorder
traversal
L
R
V
F
T
T
T
F
TRUE
TRUE
TRUE
FALSE
FALSE FALSE
FALSE
FALSE
TRUE
TRUE
TRUE
TRUE
node
34. Threaded Binary Trees (1/10)
• Threads
• Do you find any drawback of the above tree?
• Too many null pointers in current representation of binary
trees
n: number of nodes
number of non-null links: n-1
total links: 2n
null links: 2n-(n-1) = n+1
• Solution: replace these null pointers with some useful
“threads”
35. Threaded Binary Trees (2/10)
• Rules for constructing the threads
• If ptr->left_child is null,
replace it with a pointer to the node that would be visited
before ptr in an inorder traversal
• If ptr->right_child is null,
replace it with a pointer to the node that would be visited
after ptr in an inorder traversal
36. Threaded Binary Trees (3/10)
• A Threaded Binary Tree
A
C
G
I
D
H
F
dangling
dangling
H D I B E A F C G
inorder traversal:
E t
t
B f
f
t: true thread
f: false child
root
37. Threaded Binary Trees (4/10)
• Two additional fields of the node structure, left-thread and right-
thread
• If ptr->left-thread=TRUE,
then ptr->left-child contains a thread;
• Otherwise it contains a pointer to the left child.
• Similarly for the right-thread
38. Threaded Binary Trees (5/10)
• If we don’t want the left pointer of H and the right pointer of G to be
dangling pointers, we may create root node and assign them pointing
to the root node
39. Threaded Binary Trees (6/10)
Inorder traversal of a threaded binary tree
• By using of threads we can perform an inorder traversal
without making use of a stack (simplifying the task)
• Now, we can follow the thread of any node, ptr, to the
“next” node of inorder traversal
1. If ptr->right_thread = TRUE, the inorder successor of ptr
is ptr->right_child by definition of the threads
2. Otherwise we obtain the inorder successor of ptr by
following a path of left-child links from the right-child of
ptr until we reach a node with left_thread = TRUE
40. Threaded Binary Trees (7/10)
• Finding the inorder successor (next node) of a node
threaded_pointer insucc(threaded_pointer tree){
threaded_pointer temp;
temp = tree->right_child;
if (!tree->right_thread)
while (!temp->left_thread)
temp = temp->left_child;
return temp;
}
Inorder
tree
temp
41. Threaded Binary Trees (8/10)
• Inorder traversal of a threaded binary tree
void tinorder(threaded_pointer tree){
/* traverse the threaded binary tree inorder */
threaded_pointer temp = tree;
for (;;) {
temp = insucc(temp);
if (temp==tree)
break;
printf(“%3c”,temp->data);
}
}
Time Complexity: O(n)
tree
output: FC G
H D I B E A
42. Threaded Binary Trees (9/10)
Inserting A Node Into A Threaded Binary Tree
Insert child as the right child of node parent
1. change parent->right_thread to FALSE
2. set child->left_thread and child->right_thread to TRUE
3. set child->left_child to point to parent
4. set child->right_child to parent->right_child
5. change parent->right_child to point to child
43. Threaded Binary Trees (10/10)
• Right insertion in a threaded binary tree
void insert_right(thread_pointer parent, threaded_pointer child){
/* insert child as the right child of parent in a threaded binary tree */
threaded_pointer temp;
child->right_child = parent->right_child;
child->right_thread = parent->right_thread;
child->left_child = parent;
child->left_thread = TRUE;
parent->right_child = child;
parent->right_thread = FALSE;
If(!child->right_thread){
temp = insucc(child);
temp->left_child = child;
}
}
X
A
B
C
root
child
parent
A
B
C
child
parent
D
E F
successor
temp
First Case
Second Case
X
44. Binary Search Trees (1/8)
Definition of binary search tree:
• Every element has a unique key
• The keys in a nonempty left subtree (right subtree) are
smaller (larger) than the key in the root of subtree
• The left and right subtrees are also binary search trees
45. Binary Search Trees (2/8)
Example: (b) and (c) are binary search trees
medium
larger
smaller
48. Binary Search Trees (5/8)
• Inserting into a binary search tree
An empty tree
49. Binary Search Trees (6/8)
• Deletion from a binary search tree
• Three cases should be considered
• case 1. leaf delete
• case 2.
one child delete and change the pointer to this child
• case 3. two child either the smallest element in the right
subtree or the largest element in the left subtree
50. Binary Search Trees (7/8)
• Height of a binary search tree
• The height of a binary search tree with n elements can
become as large as n.
• It can be shown that when insertions and deletions are
made at random, the height of the binary search tree is
O(log2n) on the average.
• Search trees with a worst-case height of O(log2n) are called
balance search trees
51. Binary Search Trees (8/8)
• Time Complexity
• Searching, insertion, removal
• O(h), where h is the height of the tree
• Worst case - skewed binary tree
• O(n), where n is the # of internal nodes
• Prevent worst case
• rebalancing scheme
• AVL, 2-3, and Red-black tree