Stack Practice Questions

Duration: 4 min

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Inside: a video lesson and guided study material.

Module outline

  1. About the Course: About the Course
  2. Paper-1 & 2 | Basic Numeracy: Ratio and Proportion (Ratios), Divisibility Rules, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Sequence and Series (Series), Speed Time and Distance, Percentage, Average, Mensuration and Geometry, Age Problems, Arithmetic, Statistics, Probability, Profit and Loss, Simple Interest and Compound Interest, Partnership, Speed Mathematics and Basic Mathematics, Algebra, Powers and Exponents (Surds and Indices), Time and Work, Pipe and Cistern, RSSB Specific Videos - Basic Numeracy
  3. Paper-1 & 2 | Data Interpretation: Data Interpretation
  4. Paper-1 & 2 | General Mental Ability: Mental Ability, RSSB Specific Videos - Mental Ability
  5. Paper-1 & 2 | Logical Reasoning and Analytical Ability: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Syllogisms, Seating Arrangements, Blood Relations, Directions (Direction Test), Analytical Reasoning (Counting Figures Reasoning), Puzzle Solving (Puzzles), Calendar, Clock, Cubes & Dices, Venn Diagram, Analogy, Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Arrangement, Logical Sequence Of Words, Crypt Arithmetic
  6. Paper-1 & 2 | Decision Making and Problem Solving: Selection Decision Table (Decision Making)
  7. Paper-1 | General Science: Physics, Biology, Chemistry, RSSB Specific Videos
  8. Paper-1 | General Awareness: State Wise GK, GK- Current Affairs
  9. Paper - 2 | Digital Logic Systems: Digital Systems & Boolean Basics, Logic Gates & Hardware, Combinational Circuit, Sequential Circuits
  10. Paper-2 | Database Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Calculus, Relational Algebra, SQL, NoSQL
  11. Paper-2 | Data Structures & Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Algorithm Analysis, Sorting Algorithms, Intro to Compilers, Hashing
  12. Paper 2 | Data Communication and Network Security: Introduction to CN, Data Communication, Data Link Layer - Ethernet, DLL: Error Control, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Application Layer, Hardware basics, Network Security, Ethical Hacking
  13. Paper-2 | Operating Systems: Introduction to OS, Process Management, Memory Management, File Management, Deadlock
  14. Paper-2 | Computer Organization and Architecture: Basics of COA, Floating Point Rep, Cache Memory Organization, Input Output Organisation, Instr Formats & Modes, Control Unit Design, Register Transfer and Microoperations, Programming the Basic Computer, Number System, Number Representation
  15. Paper 2 | System Analysis and Design: Fundamentals of Systems and Information Systems, Fundamentals of Software Engineering, SDLC and Development Approaches, Software Documentation and Software Requirements Specification (SRS), SDD and Quality Assurance, Security, Risk Management & Maintenance, Software Testing
  16. Paper-2 | C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  17. Paper 2 | OOPS , C++ , JAVA: Language Design, OOPS with C++, Java, .Net Programming, Java Fundamentals
  18. Paper 2 | Python: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  19. Emerging Trends and AI: Emerging Tech Trends, Artificial Intelligence
  20. Paper-2 | Data Processing (Ms-Office): MS Office Applications
  21. Paper-2 | Internet and Web Technologies: HTML Basics, CSS, XML, JavaScript-Basics, Internet Fundamentals, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, Terms & Abbreviations, Cyber Threats and Malware Attacks, Role of Internet and Web Services, Security in Mobile and Wireless Computing
  22. Paper 2 | Pedagogy: Child Development, Theories, Concept of Pedagogy, Inclusive Education, Experiential Pedagogy, Assessment & Evaluation, Psychology, Curriculum Framework & Reforms, National Education Policy (NEP) 2020
  23. Live Classes: RSSB Live Sessions
  24. Paper 1 - Full Mock Tests:
  25. Paper 2 - Full Mock Tests:
  26. BCI Previous Year Papers:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video lecture focuses on the implementation of a stack data structure using a linked list. The instructor presents a multiple-choice question asking to identify the correct statement regarding push and pop operations. He begins by defining the fundamental property of a stack: Last In First Out (LIFO). He illustrates this concept by drawing a vertical stack diagram and listing elements 10, 20, 30, and 40. He then transitions to explaining how this structure translates to a linked list, emphasizing that for efficient O(1) operations, both insertion (push) and deletion (pop) must occur at the same end of the list. He demonstrates the process of inserting nodes at the head of the linked list, showing how the head pointer updates with each new element. Finally, he analyzes the given options, explaining why inserting at one end and removing from the other describes a Queue (FIFO) rather than a Stack, leading to the conclusion that "None of the above" is the correct answer.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor introduces the question about linked list stack implementation. He writes "LIFO" and "FIFO" on the board to distinguish between stack and queue properties. He draws a stack diagram and writes the numbers 10, 20, 30, 40 to represent elements. He starts drawing a linked list node structure, showing a data field and a next pointer. He explains the concept of inserting a node at the beginning of the list, drawing a node with data '10' and a pointer. He then shows how a new node '20' is inserted before '10', becoming the new head. This visual demonstration sets the stage for analyzing the time complexity of operations. He emphasizes that the head pointer changes with every insertion, ensuring the most recent element is always accessible.

  2. 2:00 – 4:30 02:00-04:30

    The instructor continues the linked list demonstration by adding nodes '30' and '40' to the head of the list. He writes "Push & Pop O(1)" to indicate the efficiency of operations at the head. He then evaluates Option (A), which suggests inserting at the beginning and removing from the end. He crosses this out, explaining that removing from the end is O(n) and violates the LIFO principle if the last inserted element is at the head. He evaluates Option (B), which suggests inserting at the end and removing from the beginning. He also crosses this out, noting that this describes a Queue (FIFO) behavior. He concludes that for a stack, push and pop must happen at the same end. He marks Option (D) "None of the above" as the correct answer, reinforcing that the options provided describe queue operations, not stack operations. He explicitly writes "Head -> 40 -> 30 -> 20 -> 10" to show the final state of the linked list after all insertions.

The lecture effectively bridges the gap between abstract data structure concepts and their concrete implementation. By visually constructing the linked list step-by-step, the instructor clarifies why specific operation sequences define a stack versus a queue. The key takeaway is that a stack requires push and pop operations to occur at the same end of the linked list to maintain the LIFO property and achieve O(1) time complexity. This distinction is crucial for understanding data structure selection in algorithm design.

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