Link List Traversal Using Recusrion

Duration: 3 min

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Inside: a video lesson and guided study material.

Module outline

  1. English Comprehension/Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Vocabulary, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Subject Verb Agreement (Verb Noun Agreement), Tenses, Verb, Articles, Preposition, Conjunction, Pronoun, Noun, Adjectives, Adverb, Modals, Cloze Test (Cloze Passage), Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Construction
  2. Logical Ability: Coding Decoding, Directions (Direction Test), Analogy, Inequality, Data Sufficiency, Series (Number and Letter Series) (Numerical Relations and Reasoning), Syllogisms, Seating Arrangements, Puzzle Solving (Puzzles), Blood Relations, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Ranking, Order and Sequence, Logical Sequence Of Words, Data Arrangement, Venn Diagram, Calendar, Clock
  3. Quantitative Ability: Logarithm, Permutation and Combination, Probability, Profit and Loss, Speed Time and Distance, Mixture and Alligation, Partnership, Simple Interest and Compound Interest, Percentage, Ratio and Proportion (Ratios), Average, Time and Work, Pipe and Cistern, Number System, Divisibility Rules, HCF LCM, Algebra, Powers and Exponents (Surds and Indices), Mensuration and Geometry, Age Problems, Data Interpretation, Sequence and Series (Series)
  4. Basic Analytical Ability: Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Analytical Reasoning (Counting Figures Reasoning), Cubes & Dices, Selection Decision Table (Decision Making)
  5. Computer Programming: Pseudo Codes, Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  6. DBMS (Computer Science): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Transaction Management, Concurrency Control, Database Security & Authorization
  7. SQL (Computer Science): SQL
  8. OS (Computer Science): Introduction to OS, Process Management, CPU Scheduling, Deadlock, Process Synchronization, Threads & Process Creation, Memory Management, Virtual Memory, File Management
  9. Computer Networks (Computer Science): Introduction to CN, Data Communication, 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, Network Security
  10. Data Structures (Computer Science): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  11. OOPs (Computer Science): Object Oriented Programming (OOPS)
  12. Software Engineering (Computer Science): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  13. SVAR Conversational - Spoken English: Communication Assessment
  14. HR Interview: MR & HR Interview Preparation
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video lecture focuses on the algorithmic concept of traversing a linked list using recursion. The instructor begins by stating the problem: writing pseudo-code where a pointer head points to the first node. He displays a C-style function What that accepts a node pointer. The core logic involves a conditional check if head is not NULL. Inside the block, the code prints the data of the current node using Printf and then makes a recursive call What head next. To illustrate this, he draws a linked list containing nodes labeled a, b, c, and d. He traces the execution, showing how the function processes the first node, then moves to the second, and so on, until the list ends.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces the specific question displayed on the screen: Write a pseudo code for Traversing a link list recursively, where pointer head have the address of the first node of the list. He then presents the solution code, defining a main function that calls What head and the What function itself. The function checks if head is not NULL. If the condition is met, it executes a print statement for the data and calls itself with the next pointer. He draws a visual representation of a linked list with four nodes containing values a, b, c, and d to serve as a concrete example for the trace.

  2. 2:00 – 3:01 02:00-03:01

    The instructor deepens the explanation by drawing a recursion tree to visualize the call stack. He writes w a at the top, branching down to w b, then w c, w d, and finally w NULL. He underlines the two critical lines of code: the print statement and the recursive call, emphasizing that printing happens before the recursive step. He explains that the recursion terminates when the head pointer becomes NULL, preventing infinite loops. This visual aid helps students understand the sequential nature of the traversal and the base case required to stop the recursion.

The lecture successfully demonstrates recursive traversal by combining code analysis with visual tracing. The instructor moves from the abstract problem statement to concrete code, then to a data structure diagram, and finally to a recursion tree. This progression helps students visualize how the function call stack grows and shrinks as it moves through the list. The emphasis on the order of operations—printing data before recursing—highlights the pre-order nature of this specific traversal method.

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