Reverse Coding

Duration: 5 min

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Module outline

  1. Communication Round: Vocabulary, Subject Verb Agreement (Verb Noun Agreement), Tenses, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Direct and Indirect Speech, Active Passive Voice (Voice), Verbal Analogy (Word Based Analogy), Articles, Preposition, Conjunction, Sentence Construction, English Writing Ability, Communication Assessment
  2. Quantitative Aptitude: Ratio and Proportion (Ratios), Divisibility Rules, Data Interpretation, Mixture and Alligation, Permutation and Combination, Logarithm, Number System, HCF LCM, Speed Time and Distance, Percentage, Average, Powers and Exponents (Surds and Indices), Time and Work, Mensuration and Geometry, Age Problems, Pipe and Cistern, Probability, Profit and Loss, Simple Interest and Compound Interest, Algebra
  3. Analytical and Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Data Sufficiency, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Directions (Direction Test), Ranking, Order and Sequence, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Logical Sequence Of Words, Puzzle Solving (Puzzles), Syllogisms, Seating Arrangements, Calendar, Clock, Blood Relations, Cubes & Dices, Venn Diagram, Analytical Reasoning (Counting Figures Reasoning)
  4. Cognizant Gaming Aptitude: Gamified / Game Based Aptitude
  5. Java (Cluster 1): Java
  6. ANSI SQL MySQL (Cluster 1,2,3): SQL
  7. HTML, CSS, JavaScript (Cluster 1,3): HTML, CSS, JavaScript
  8. Python (Cluster 2): Python for Placements by Yash Sir
  9. Cloud Fundamentals (Cluster 2): Emerging Tech Trends
  10. C# (Cluster 3): C#
  11. OOPs: Object Oriented Programming (OOPS)
  12. Technical Assessment (Coding): Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Pseudo Codes
  13. Data Structures: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  14. DBMS: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  15. Operating Systems: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  16. Computer Networks: 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, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This video is a tutorial on 'Reverse Coding' for programming interviews, presented by a 'Placement Expert' from Knowledge Gate. The lesson begins by presenting a problem: identifying a pattern between a set of input numbers and their corresponding outputs. The instructor analyzes the given data, which includes inputs like 10, 15, 23, 99, and 107, and their outputs 5, 8, 12, 50, and 54. He systematically deduces the pattern by first observing that the output is half of the input for even numbers (e.g., 10/2=5) and half of the input plus one for odd numbers (e.g., (15+1)/2=8). This leads to the formula (n+1)/2 for odd numbers and n/2 for even numbers. The instructor then demonstrates how to implement this logic in C code, writing a function `target` that uses a loop to sum the results of `i%2` for all integers from 1 to n, which effectively calculates the number of odd numbers in that range. The final code snippet shows the complete program, including the `main` function that reads an input and prints the result of the `target` function.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with the 'Knowledge Gate' logo, followed by a slide that introduces the topic 'Reverse Coding'. The slide displays a table with 'Input' and 'Output' columns, showing a series of number pairs: (10, 5), (15, 8), (23, 12), (99, 50), and (107, 54). The instructor, identified as a 'Placement Expert', begins to analyze this data to identify a pattern. He starts by examining the first pair, 10 and 5, and begins to write on the screen, drawing a red line to connect the input to the output, setting up the problem for the audience.

  2. 2:00 – 4:47 02:00-04:47

    The instructor continues to analyze the pattern. He writes 'Even/Odd' on the screen and then demonstrates the logic for the first two examples. For input 10, he writes '10/2 = 5'. For input 15, he writes '15+1 = 16, 16/2 = 8'. He then generalizes this to the formula (n+1)/2 for odd numbers and n/2 for even numbers. He explains that the output is the count of odd numbers from 1 to n. He then transitions to coding, writing a C program. The code includes a function `target` that initializes a variable `ans` to 0, then uses a for loop from 1 to n, adding `i%2` to `ans` in each iteration. He explains that `i%2` is 1 for odd numbers and 0 for even numbers, so the sum is the count of odd numbers. The final code shows the `main` function that reads an integer `n` and prints the result of `target(n)`. The video ends with the complete code on screen.

The video presents a structured approach to solving a common programming interview problem. It starts with a data-driven analysis, where the instructor uses a table of inputs and outputs to deduce a mathematical pattern. The key insight is recognizing the difference between even and odd numbers and formulating a conditional logic. This logical solution is then translated into a practical programming implementation. The final C code cleverly uses the modulo operator to count odd numbers, demonstrating a direct and efficient way to solve the problem. The lesson effectively connects abstract pattern recognition with concrete coding, which is a fundamental skill for technical interviews.

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