Tree Traversal Pseudocode (Post-Order )

Duration: 8 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.

The video lecture analyzes a C function named `what` that performs a tree traversal. The instructor displays the code and draws a binary tree to trace the function's execution. He explains the recursive calls and the base case, then determines the output sequence. The final result is identified as a Post-Order Traversal, with the output sequence 10 8 9 5 12.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a programming problem displayed at the top: "Find what this function is doing?". The code snippet `void what(struct Bnode *t)` is shown in orange text on the left side. The instructor uses a digital pen to underline the function name `what` and the parameter `t`, emphasizing the recursive nature of the function. He explains the `if (t)` condition, which serves as the base case to prevent null pointer dereferencing. He then begins to draw a binary tree on the whiteboard space to the right. He draws a root node containing the value 12. From this root, he draws a left edge to a node with value 10 and a right edge to a node with value 5. This visual setup is crucial for understanding how the function traverses the data structure. The instructor's gestures guide the viewer's attention to the code and the diagram simultaneously. The background is white with a faint watermark "KnowledgeGate". The instructor is visible in the bottom right corner, wearing a black shirt. The code includes a `printf` statement which is not yet explained. The instructor's focus is on the code structure. The text "Find what this function is doing?" is clearly visible. The instructor's hand movements are deliberate.

  2. 2:00 – 5:00 02:00-05:00

    Continuing the diagram, the instructor adds the remaining nodes to the binary tree. Node 5 is shown to have a left child with value 8 and a right child with value 9. He starts the execution trace by writing `what(12)` at the top right. He explains that the function first calls itself on the left child, so he writes `what(10)`. He traces further down, noting that node 10 has no children, so he writes `w(NULL)` for both its left and right children. He moves to the right subtree, tracing `what(5)`. He then traces `what(8)` and writes `w(NULL)` for its children. Similarly, he traces `what(9)` and writes `w(NULL)` for its children. This detailed tracing shows the depth-first approach of the recursion. The instructor writes these calls in black ink, contrasting with the orange code. The tree structure is now fully drawn, showing a complete binary tree with 5 nodes. The instructor is methodically tracing the path of execution. The visual representation of the tree is key to understanding the recursion. The instructor's handwriting is legible. The tree nodes are clearly labeled with numbers.

  3. 5:00 – 7:37 05:00-07:37

    The instructor completes the execution trace by determining the order in which the `printf` statement executes. Since the print statement comes after the recursive calls, it executes when the recursion unwinds. He writes the final output sequence at the bottom: 10 8 9 5 12. He circles the `printf` line in the code to highlight that this is the action performed. He explicitly states that this traversal order, visiting the left subtree, then the right subtree, and finally the root, is known as Post-Order Traversal. He draws a green box around the final output sequence to emphasize the result. The video concludes with a clear explanation of the function's purpose, linking the code structure to the traversal algorithm. The final output is clearly visible in a green box at the bottom left. The instructor points to the code and the output to reinforce the connection. The code lines `what(t -> LC)` and `what(t -> RC)` are clearly visible. The instructor's explanation ties the visual trace to the theoretical concept. The green box is a strong visual cue. The instructor's final summary is clear.

The video provides a step-by-step analysis of a recursive C function that traverses a binary tree. By drawing the tree and tracing the function calls, the instructor demonstrates that the function performs a Post-Order Traversal. The key takeaway is that the root node is processed after its left and right subtrees, resulting in the output sequence 10 8 9 5 12 for the given tree structure.

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