Hashing | Hash based data structures
In computing, a hash table, also known as hash map, is a data structure that implements an associative array or dictionary. It is an abstract data type that maps keys to values. A hash table uses a hash function to compute an index, also called a hash code, into an array of buckets or slots, from which the desired value can be found. During lookup, the key is hashed and the resulting hash indicates where the corresponding value is stored. Ideally, the hash function will assign each key to a unique bucket, but most hash table designs employ an imperfect hash function, which might cause hash collisions where the hash function generates the same index for more than one key. Such collisions are typically accommodated in some way. In a well-dimensioned hash table, the average time complexity for each lookup is independent of the number of elements stored in the table. Many hash table designs also allow arbitrary insertions and deletions of key–value pairs, at amortized constant average cost per operation. Hashing is an example of a space-time tradeoff. If memory is infinite, the entire key can be used directly as an index to locate its value with a single memory access. On the other hand, if infinite time is available, values can be stored without regard for their keys, and a binary search or linear search can be used to retrieve the element. In many situations, hash tables turn out to be on average more efficient than search trees or any other table lookup structure. For this reason, they are widely used in many kinds of computer software, particularly for associative arrays, database indexing, caches, and sets. (Wikipedia).
Get the Code Here: http://goo.gl/srwIf Welcome to my Java Hash Table tutorial. A Hash Table is a data structure offers fast insertion and searching capabilities. The negative is that they are limited in size because they are based on arrays. They are also hard to order. People get confus
From playlist Java Algorithms
Hash Tables and Hash Functions
This computer science video describes the fundamental principles of the hash table data structure which allows for very fast insertion and retrieval of data. It covers commonly used hash algorithms for numeric and alphanumeric keys and summarises the objectives of a good hash function. Co
From playlist Data Structures
Hash tables in 4 minutes. Code: https://github.com/msambol/youtube/blob/master/data_structures/hash_table.py Sources: 1. https://www.amazon.com/Introduction-Algorithms-3rd-MIT-Press/dp/0262033844 2. https://wiki.python.org/moin/TimeComplexity 3. https://stackoverflow.com/questions/20612
From playlist Data Structures // Michael Sambol
Hash Table And HashMap In Python | Implementing Hash Tables Using Dictionary In Python | Edureka
** Python Certification Training: https://www.edureka.co/python ** This Edureka video on 'HashTables and HashMaps in Python' will help you learn how you to implement Hash Tables and HashMaps in Python using dictionaries. Below are the topics covered in this video: What is a Hash Table
From playlist Python Programming Tutorials | Edureka
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From playlist Data structures playlist
An informal introduction to cryptography. Part of a larger series teaching programming at http://codeschool.org
From playlist Cryptography
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From playlist Data structures playlist
Introductory coverage of fundamental data structures. Part of a larger series teaching programming. Visit http://codeschool.org
From playlist Data Structures
Dictionary, Hash Tables And Sets In C# | C# Data Structures Explained | C# Tutorial | Simplilearn
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From playlist C++ Tutorial Videos
Hash table separate chaining source code
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From playlist Data structures playlist
Hash table open addressing code
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From playlist Data structures playlist
From playlist Week 6 2015 Shorts
*** This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming. *** HOW TO SUBSCRIBE http://www.youtube.com/subscription_center?add_user=cs50tv HOW TO TAKE CS50 edX: https://cs50.edx.org/ Harvard Extension School: ht
From playlist CS50 Shorts
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From playlist Data structures playlist
Related Videos: Hash table intro/hash function: https://www.youtube.com/watch?v=2E54GqF0H4s Hash table separate chaining: https://www.youtube.com/watch?v=T9gct6Dx-jo Hash table separate chaining code: https://www.youtube.com/watch?v=Av9kwXkuQFw Hash table open addressing: https://www.youtu
From playlist Data structures playlist