Most Popular Hash Function

Duration: 3 min

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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 details the Division-remainder method, identified as the most popular hash function. The instructor explains that the hash table size is estimated first and then used as a divisor for each original key value. The resulting remainder is the hashed value. The slide text warns that this method is liable to produce collisions, necessitating a search mechanism to recognize and handle them. Two formulas are presented: H(K) = K(mod m) and H(K) = K(mod m) + 1. The instructor uses a whiteboard to draw a hash table and illustrate the mapping process.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor begins by defining the Division-remainder method. He writes the formula H(K) = K(mod m) on the screen. He draws a large vertical rectangle to represent the hash table. He labels the top index as 0 and the bottom as 9, indicating a table size of 10. He writes 'K mod 10' next to the table and draws a triangle shape below it to represent the range of possible remainders from 0 to 9, visually mapping the math to the table. He circles the formula H(K) = K(mod m) to highlight it as the primary equation. The slide text mentions extracting a quotient and a remainder.

  2. 2:00 – 2:33 02:00-02:33

    The instructor continues to reference the drawn hash table. He points to the slots labeled 1, 2, 3, etc., showing where items would be placed. He circles the formula H(K) = K(mod m) again to reinforce the concept. He briefly gestures towards the second formula H(K) = K(mod m) + 1, explaining it as an alternative that shifts the index range by one. The visual demonstration connects the mathematical modulo operation to the physical slots in the data structure. The bottom of the screen displays 'SANCHIT JAIN SIR' and 'KNOWLEDGE GATE EDUCATOR'.

The lecture provides a clear visual and mathematical explanation of the Division-remainder method. By drawing a table of size 10 and writing 'K mod 10', the instructor concretely shows how the modulo operator restricts hash values to the valid index range. The emphasis on the formula H(K) = K(mod m) and the warning about collisions provides a complete overview of this fundamental hashing technique.

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