Link List Traversal Using Recusrion

Duration: 3 min

This video lesson is available to enrolled students.

Return to /learn/HPSC-PGT-COMPUTER-SCIENCE/data-structure-algorithms/linked-list/sll-basics-standard-operations/asset-link-list-traversal-using-recusrion after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. HPSC Interview Preparation: Interview Preparation
  2. Python Language: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis, DSA using Python
  3. Data Structure & Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Sorting Algorithms, Minimum Spanning Trees, Time Complexity Analysis, Graph Theory, Shortest Path Algos
  4. Computer Networks: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security
  5. Computer System & Organisation: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer
  6. Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, SQL, File Organization & Indexing, Transaction Management, Concurrency Control
  7. Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling
  8. Digital Logic & Circuits: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation
  9. Theory Of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Pushdown Automata & CFG, Turing Machines, Moore & Mealy Machines
  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. Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, Data Warehousing & Mining
  12. Introduction to Emerging Trends: Emerging Tech Trends
  13. Digital Society & Cyber Law: Society, Law & Ethics
  14. HPSC PGT Previous Year Paper:
  15. HPSC Assistant Professor Previous Year Paper:
  16. Live Sessions: HPSC Live Sessions, EMRS TGT/PGT Live Class
  17. Full Mock Test:
  18. HPSC PGT - MOCK Test Series:
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.

Loading lesson…