Tree Traversal Pseudocode PQ

Duration: 6 min

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Module outline

  1. General Intelligence & Reasoning: Analogy, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Logical Sequence Of Words, Syllogisms, Venn Diagram, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Data Sufficiency, Puzzle Solving (Puzzles), Data Arrangement, Cubes & Dices, Calendar, Clock, Arithmetic, Number System, HCF LCM, Verbal Analogy (Word Based Analogy), Visual Recognition and Figure Completion, Paper Folding and Cutting, Transformation of Shapes, Clocks and Calendars, Direction Sense, Cubes and Dice, Patterns in Two-Dimensional Figures, Seating Arrangements, Analogy and Classification, Logical Deduction and Induction, Alphabet and Word Tests, Mathematical Operations, Series Completion, Simplification and Approximation, Coding and Decoding, Numerical Reasoning, Assembling and Grouping of Shapes, Three-Dimensional Patterns and Visualization, Vocabulary, Number System, Averages, Mixtures and Alligation, Simple and Compound Interest, Percentages, Algebra, Speed, Time and Distance, Seating and Arrangement Puzzles, Traverse Surveying, Order, Ranking and Sequence, Constraint Puzzles, Syllogisms and Venn Diagrams, Reading Comprehension, Critical Reasoning, Permutations and Combinations, Narrative Sequencing, Project Monitoring, Resources and Safety, Profit, Loss and Discount, Ratio and Proportion, Time and Work, Mensuration, Data Interpretation, Powers, Surds and Logarithms, Sequences and Series, Articles and Determiners, Sentence Completion, Data Sufficiency, Blood Relations, Simple Interest and Compound Interest, Mixture and Alligation, Sequence and Series (Series), Speed Time and Distance, Algebra, Profit and Loss, Powers and Exponents (Surds and Indices), Permutation and Combination
  2. General Awareness: Physics, Chemistry, Biology, History, Geography, Polity, Indian Economy, Environment, Static General Knowledge, GK- Current Affairs, Artificial Intelligence, MS Office Applications, Terms & Abbreviations, Keyboard Shortcuts, Evolution of Indian Banking (Banking & Financial Awareness), Emerging Tech Trends
  3. Engineering Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Linear Algebra, Calculus, Probability, Statistics, Signal Space and Optimum Detection, Probability, Statistics
  4. Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep, Number Systems and Codes, Registers and Counters, Boolean Algebra and Logic Gates, Microprocessors and Microcontrollers, Logic Families and CMOS Logic, Microprocessors, Logic Gates and Boolean Algebra, Minimization of Boolean Functions, Timing, Hazards and Testing, Logic Families, Combinational Logic Design, Arithmetic Circuits, Waveform Generators and Timer Circuits, Semiconductor Memories and Programmable Logic Devices, Combinational Logic Circuits, Latches and Flip-Flops, Finite State Machines, Sequential Circuits and State Machines, Minimization of Boolean Functions, Arithmetic Circuits, Latches and Flip-Flops, Number Systems and Codes, Registers and Counters
  5. Computer Organisation & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer, Register Transfer and Microoperations, Semiconductor Memories and Programmable Logic, Processor Organization and Instructions, Memory Hierarchy and Input/Output, Registers and Counters
  6. Programming & Data Structures: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, HTML Basics, OOPS with C++, Java, Object Oriented Technology
  7. Databases: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, Database Security & Authorization
  8. Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  9. Theory of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines, Complexity Theory
  10. Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  11. Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management, Security, Windows OS, Distributed Systems, Unix OS, Linux OS
  12. Computer Networks: Introduction to CN, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware Basics, Data Communication, Website, Browser & Services, Web Design & Development, Network Security, Cyber Threats and Malware Attacks, Cyber Safety and Security
  13. Full Length Mock Tests:
  14. Sectional Tests:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a detailed step-by-step walkthrough of tracing the execution of two mutually recursive functions, A and B, operating on a binary tree data structure. The instructor begins by presenting the C-like pseudocode for both functions and a sample binary tree. He then manually simulates the function calls, drawing a call tree to visualize the recursion depth and order. The primary goal is to determine the sequence of integers printed to the console by the printf statements within the functions. The video serves as a practical example of understanding recursion and function call stacks in computer science, specifically focusing on how two functions can call each other. The instructor uses a whiteboard or digital canvas to draw the tree and the call stack.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video starts with the problem statement: "Find what this function is doing?" The code for Void A(struct Bnode *t) and Void B(struct Bnode *t) is displayed on the screen. Function A is defined to recursively call B on the left child, print the current node's data, and then call B on the right child. Conversely, Function B prints the current node's data, then recursively calls A on the left child, and finally calls A on the right child. The instructor draws a binary tree with root 10, left child 30, right child 30, and a left child of the left 30 which is 40. He initiates the trace by calling A(10) and explains the initial steps of the recursion, setting up the context for the detailed trace. He carefully follows the indentation and logic flow.

  2. 2:00 – 5:00 02:00-05:00

    The instructor meticulously traces the execution on the right side of the screen, drawing a tree of function calls to keep track of the state. Starting with A(10), it calls B(30) (left child). Inside B(30), it prints 30. Then it calls A(40) (left child of 30). Inside A(40), it calls B(NULL) (left child of 40), which returns immediately because the node is null. Then A(40) prints 40. Then A(40) calls B(NULL) (right child of 40), which returns. A(40) returns. Back in B(30), it calls A(NULL) (right child of 30), which returns. B(30) returns. Back in A(10), it prints 10. Then it calls B(30) (right child of 10). Inside this B(30), it prints 30. Then it calls A(NULL) (left child) and A(NULL) (right child), both returning immediately. The instructor writes the final output sequence in a green box: 30 40 10 30. He underlines the printed values as he goes. He writes the numbers 30, 40, 10, 30 in a box at the bottom.

  3. 5:00 – 5:36 05:00-05:36

    The instructor concludes the lesson by reviewing the code structure one last time. He highlights the mutual recursion where A calls B and B calls A. He points out the specific lines of code responsible for the printing and the recursive calls, emphasizing the order of operations. He confirms that the output sequence 30 40 10 30 is correct based on the trace. He emphasizes understanding the order of execution in mutually recursive functions and how the call stack unwinds. The video ends with the final answer clearly displayed and the instructor summarizing the key takeaway about the traversal order. The instructor ensures the student understands the base case where the node is null.

The video effectively demonstrates the concept of mutual recursion through a concrete example. By tracing the execution of functions A and B on a binary tree, the instructor clarifies how the call stack operates when functions call each other. The step-by-step visual aid of drawing the call tree helps students understand the order of operations and the final output sequence. This method is crucial for debugging and understanding complex recursive algorithms in computer science.

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