# What is Hash Table, how to create a hash table?

Let’s learn what is Hash Table, how to create a hash table. The most accurate or helpful solution is served by Stack Overflow.

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Best solution

How to create an efficient static hash table?

I need to create small-mid sized static hash tables from it. Typically, those will have 5-100 entries. When the hash table is created, all keys hashes are known up-front (i.e. the keys are already hashes.) Currently, I create a HashMap, which is I sort the keys so I get O(log n) lookup which 3-5 lookups on average for the sizes I care. Wikipedia claims that a simple hash table with chaining will result in 3 lookups on average for a full table, so that's not yet worth the trouble for me (i.e. taking...

You can use Sux4j to generate a minimal perfect hash in Java or C++. (I'm not sure you are using Java...

Anteru at Stack Overflow

Other solutions

How do I create my own Hash Table implementation in Python?

I was thinking of a basic implementation where I could use a small array of some size, but what seems to be most problematic is the collision resolution part. I was thinking of using BST/Linked lists to place items with same hash(index), but conflict...

Use a list of lists. Preliminaries A hash table maps a possibly infinite domain to a finite output range...

Create a program that uses the division method of hashing to store the data values into hash table with table?

create a data set with 100 integer values. create a program that uses the division method of hashing to store the data values into hash table with table sizes 7 , 51, 151. use linear probing method of collision resolution. print out the tables after...

Sure! But you may have to wait a little since it will take a bit of time.

Hashing, using an array and a linked list, is possible, not sure of the case where we could  do it ...

Priyanshu Singh at Quora

How is the size of hash table determined?

Suppose I want to create efficient hash table for about 200,000 English words. I will use djb2 hash function ((seed_hash * 33) + word[i]) % SIZE , (Page on cse.yorku.ca) .  I'll use bucket linked list for collision. I am using C (c99) , compiler gcc...

It's a tuning parameter - it depends what you're trying to optimize and what resources you have or are...

Dan Allen at Quora

Using a hash table with keyword searches.?

A little background: The project is to store a file of "mp3s" in the form Title|Artist into a hash table. Some of the functions i need to write are search by title, search by artist, search by keyword and insert into a playlist. I am just confused...

take each title and hash the words of the title so Johny Be Good, Hash Johny = 27, Hash Good = 87 build...

Using hash table to point to binary tree?

I got my data structures, binary search tree and a hash table. I am just trying to see how would I be able to have table point a a BST. So, if my table is 5 cells long. They will each point to a BST and have a total of 5 BST. My data structures are basic...

You need to add some missing variables first.

Why am I getting a "could not find table" error?

I'm relatively new to Rails and I've been getting the above error whenever I'm testing my login page. Here's the test view file:     <%= form_for :user, :url => create_path do |f| %>       <p> Email: <br />  <%= f.text...

Have you created the User model and migrated the db? It may be easiest to put your code somewhere online...

Glenn Goodrich at Quora

How would you insert a node in a hash table?

To insert some thing into a hash table you need to have a hash function. So, what kind of hash functions would you use for NODES(say an object referencing a node)?

Hash functions are used on the keys which can be integers. 'Key' field is a part of the node that you...

Sagar Gupta at Quora

How does one implement a universal hash function, and would this be feasible to use, for example, in a filesystem's dentry table?

In Exploiting Unix File-System Races via Algorithmic Complexity Attacks[1], a vulnerability is described which amounts to lengthening the time a call to access(2) or open(2) takes by generating a large number of hash collisions in the dentry table. In...

Ruby and Perl have random hash functions by default. Perl uses them when too many collisions are detected...

Daniel Lemire at Quora

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