'Perfect hash function' presentation slideshows

Lecture #9

Lecture #9. Hash Tables. Objectives. Understand the basic structure of a hash table and its associated hash function Understand what makes a good (and a bad) hash function Understand how to deal with collisions Open addressing Separate chaining Be able to implement a hash table.

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Scalable Perfect Hashing Schemes and Applications

Scalable Perfect Hashing Schemes and Applications. Fabiano C. Botelho. Department of Computer Science Federal University of Minas Gerais, Brazil. Nivio Ziviani. Department of Computer Science Federal University of Minas Gerais, Brazil. What Is The Problem to Solve?.

631 views • 52 slides

Hashing

1.11k views • 46 slides

Jeopardy

542 views • 44 slides

Hashing

Hashing. Basis Ideas A data structure that allows insertion, deletion and search in O(1) in average. The location of the record is calculated from the value of its key. No order in the stored records. Relatively easy to program as compared to trees.

645 views • 43 slides

Counter Braids A novel counter architecture for network measurement

Counter Braids A novel counter architecture for network measurement. Data Measurement: Background. Accurate data measurement is needed in network and database systems. Internet Backbones Accounting/Billing by ISPs: Usage-based pricing Traffic engineering

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Topic 20 Data Structure Potpourri: Hash Tables and Maps

Topic 20 Data Structure Potpourri: Hash Tables and Maps. " hash collision n.

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Broadcast Encryption Amos Fiat & Moni Naor

Broadcast Encryption Amos Fiat & Moni Naor. Presented By Gayathri VS. Outline. The Problem Zero Message Schemes ? Basic Scheme ? 1-resilient Scheme based on 1-way function ? 1-resilient Scheme based on number-theory Low-Memory k-resilient schemes. The Problem.

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CSCI2100B Hashing Jeffrey Yu@CUHK

CSCI2100B Hashing Jeffrey Yu@CUHK. Search Records. Consider a collection of records, where a record has several fields. Given a collection of records , where each has a key . We want to search a record by some key, where a key is a field in a record.

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Simple and Space-Efficient Minimal Perfect Hash Functions

Simple and Space-Efficient Minimal Perfect Hash Functions. Fabiano C. Botelho. Department of Computer Science Federal University of Minas Gerais, Brazil. Rasmus Pagh. Computational Logic and Algorithms Group IT Univ of Copenhagen, DenMark. Nivio Ziviani. Department of Computer Science

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Hashing

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Hashing Algorithm

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Efficient Minimal Perfect Hash Language Models

Efficient Minimal Perfect Hash Language Models. David Guthrie, Mark Hepple, Wei Liu University of Sheffield. Large LMs. Brants et al. (2007) showed that MT quality continues to improve even when training corpus size is increased above 1 trillion tokens

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Tutorial 10 Hashing

Tutorial 10 Hashing. Search Records. Traversal Search ? O(n) Binary Search ? O(log n) Can we do it in O(1) ? Hashing. Hashing. Put a record into one of many buckets in some way based on the key When searching a record by key, identify the bucket and search in the bucket Main concepts

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Chapter 13 C

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CS261 Data Structures

CS261 Data Structures. Hash Tables Concepts. Goals . Hash Functions Dealing with Collisions. Searching...Better than O(log n )?. Skip lists and AVL trees reduce the time to perform operations (add, contains, remove) from O( n ) to O(log n )

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Niteesh Prasad CS-265

Hash Tables: A basic O(1) verview. Niteesh Prasad CS-265. Hash Tables in C. Data structure used for mapping/ searching. Increased efficiency to $O(1)$- Constant Look up time. Disadvantage: Wastage of memory

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CPSC 319

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Perfect Spatial Hashing

Perfect Spatial Hashing. Sylvain Lefebvre Hugues Hoppe (Microsoft Research). We design a perfect hash function to losslessly pack sparse data while retaining efficient random access:. Hash table. Offset table. Hash table. Offset table. 128 3. 38 2. 18 2. 35 3. 19 3. 128 2.

358 views • 1 slides