A hash table is a data structure used to implement an associative array (a structure that can map keys to values). It uses a "hash function" to compute an index into an array from which the value can be found.
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1answer
27 views
Unicode-capable symbol table (N-way search tree with hash buckets)
As in my previous question, this module is coupled with its own testing framework.
As a symbol-table for a Unicode-capable programming language interpreter, I decided to combine the 3 types of ...
6
votes
4answers
113 views
Hash table and linked list implementation in C++
I'm trying to improve my understanding of inheritance and template classes in C++ so I coded a hash table (see compilable source code below).
I would be greatly appreciative of any comments on how to ...
6
votes
1answer
51 views
Remove a key from a hash table efficiently
I am trying to remove a key from a hash table, which is built using linear probing. Removing a key works fine but I know I need to rehash a portion of the table after the removal but my method down ...
7
votes
1answer
224 views
Trie key/value store implementation comparing with HashMap
I have implemented a Trie-based concurrent key/value store using hashcode similar to HashMap. This is on the intention that this ...
2
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0answers
68 views
Jacob's Ladder compression [closed]
I'm currently interested in a logical decay algorithm which will need me to have the correct coordination of 3 bytes. I have 2 of them, initially. After that, I have to get 2 from the one, but in that ...
3
votes
1answer
122 views
Hash function for strings
Implementation of a hash function in java, haven't got round to dealing with collisions yet.
I tried to use good code, refactored, descriptive variable names, nice syntax.
My code must be efficient ...
1
vote
1answer
44 views
Hash Map Library for any type (Void Pointers)
This is a hash map library for C that stores void* pointers with char* strings (null terminated) for keys
...
6
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0answers
48 views
ConcurrentDecayingHashMap<K,V>, a concurrent decaying HashMap
I wrote a wrapper for Javas ConcurrentHashMap that enables you to add a decay time to inserted values, meaning they will be automatically removed after the given time. This functionality is ...
3
votes
2answers
220 views
Using EqualityComparer to find contained value
While searching for a method in HashSet which allows me to actually find an object in \$O(1)\$ (not just Contains, I need the ...
4
votes
1answer
29 views
Optimizing “complex” iteration over Map with auxiliary maps
This will be tough to explain. I am implementing a tool to support RFC6020. But when it comes to the Choice Statement, things get weird.
For the sake of better understanding, I have to remember you a ...
3
votes
0answers
39 views
HashMap and HashSet classes for ES6
The new EcmaScript standard, ES6, contains specifications for Map and Set built-in classes. Each of these collections treats an ...
3
votes
1answer
31 views
Creating simulated items sold at a store into a hash
I am writing code that creates a hash for a store that has an item, price, and sku. The hash is inserted into an array. I also create another hash based on the sku that holds the amount of inventory ...
1
vote
1answer
57 views
Gathering metadata on files in GitHub
I am a relatively new programmer and am currently working on something with the egit GitHub client library which requires me to iterate over a bunch of values and if a condition is met, add a bunch of ...
3
votes
1answer
91 views
Constructing NewsArticle objects from a database table
This class seems to be able to represent the data stored in any possible database table:
...
10
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3answers
708 views
HashTable implementation in C++
I made a simple hash table and I was wondering if there was any way to increase the efficiency of search times. My table class is called Dictionary, because C# has ...
2
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1answer
42 views
My own implementation of an hashtable
This is my own implementation of an hashtable. I would like to receive some reviews or some feedbacks.
...
2
votes
1answer
74 views
(Y.E.S.E.J.) Yet Another Singleton with Enum in Java
I have a Java class which has to be generated only once for all the objects that I have - it is a small program. This singleton class holds a mapping of characters. I Googled stack overflow and found ...
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3answers
201 views
Initialize a hash with all 0 values based on two arrays
Given two arrays (for instance a list of people and a list of subjects), I need to initialise a Hash with all zeros for all possible combinations of these two ...
4
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3answers
284 views
3
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0answers
104 views
OOP paradigm implementation of a Dictionary data model
Here is the implementation of interface Dictionary using chained hash table class HashTableChained.
Despite item 22* saying
...
4
votes
1answer
49 views
Unordered (hash) map for C
I am still working on basic data structures for C. Now I came up with a hash map:
unordered_map.h:
...
3
votes
1answer
51 views
Ordered map for C using AVL tree
I was in the mood for some data structures and I decided to code up an ordered map using AVL tree. I will post only map.h and ...
3
votes
1answer
159 views
Duplicate integers in an array
Code shows duplicate values of integers in an array with indexes and the number of occurrences. Can you please critique my code and provide your thoughts on where I should improve my code?
...
1
vote
1answer
28 views
Capping values in a map while keeping one fixed
I'm working with some Clojurescript code that reacts to user input over three sliders. These sliders get stored in a map, and I need to make sure that the sum of all is <= a ...
5
votes
2answers
149 views
Find the rarest in a map
Write a method rarest that accepts a map whose keys are strings and
whose values are integers as a parameter and returns the integer value
that occurs the fewest times in the map. If there is a ...
5
votes
4answers
562 views
Finding the most common character in a string with a hash map
I created a method for finding the most common character in a string (using HashMap):
...
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0answers
83 views
5
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2answers
174 views
Function that shortens a String based on a term/abbreviation mapping
I have a function that takes a description as a String and returns a shortened version of the description.
The shortening is done by checking if a word matches the ...
4
votes
3answers
545 views
Most common occurrence of an int in an array
I am prepping for a junior level interview in C#. I am hoping I can get some feedback on how to improve my code to print the most common occurrence of an int in an ...
2
votes
1answer
57 views
Chained hash table implementation to store student's information
This is my implementation of a Hash Table to store information about a student. Everything seems to work as expected, but I'd like some feedback on the following:
Is my style good? Is it easy to ...
6
votes
2answers
316 views
Hash table based key/value dictionary in C++ with murmur hash function, linked list buckets in 200 LOC
hashdic.h -- suggested for direct include or copy paste to your project.
...
5
votes
1answer
40 views
Dump hash in columns
I tried to answer the question "How to print a hash in Perl, such that 3 key value pairs are printed on each line?" like this.
As I got an uncommented downvote, I'd like to ask: What's wrong with/How ...
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votes
1answer
107 views
ConcurrentHashMap Implementation
I have written a simplified version of my own MyConcurrentHashMap. I tried to make use of a Lock[] array for ...
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vote
3answers
95 views
Faster method for loading a hash table
I'm looking to make my code faster for loading a hash table. Any pointers would be appreciated. Below are my includes, the node def and the loading code.
The dictionary loaded could be any *.txt ...
4
votes
1answer
72 views
Concatenating a SoundCloud Playlist Update JSON
I am currently working on an implementation of SoundCloud for a 3rd party iOS app, and as there is no SDK anymore I am doing all my calls via Alamofire.
This is what SC expects you to send in your ...
2
votes
0answers
49 views
Passing around and using Python dicts [closed]
I have an Excel file - a profit spreadsheet - which has one tab per product range. The tabs are defined and named, but apart from that, the file contains no data (yet). I wish to use ...
2
votes
1answer
197 views
LRU cache design using dict and doubly linked list
Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set.
get(key) - Get the value (will always be positive) of the ...
3
votes
1answer
167 views
A minimal HashTable implementation
For an assignment, I wrote a minimal HashTable implementation (it only supports additions; no deletions).
To resolve collisions, it uses Linear Probing (required by the assignment).
I'm looking for ...
5
votes
1answer
156 views
Hash table for Coursera's algorithms course
I implemented a hash table for Coursera's Algorithms and Design class. I am looking for feedback on coding style and other improvements. I want to practice C++ coding but I see myself drifting to C ...
2
votes
2answers
83 views
Count of words in a mutable Map
The function should get some text on input and return a map in a following format:
("word1" -> 1, "word2" -> 2 ...)
The keys are words from text and the ...
0
votes
1answer
94 views
Hash table with “Time To Live” elements
Recently, I got a very interesting task: to realize the hash table that works in multi-process server in common memory, each element of which must have a TTL property. It was suggested to implement ...
3
votes
1answer
125 views
Safely storing Azure Topic clients in concurreny dictionary
I am trying to optimize the usage of TopicClients in my app. The instance is originally covered by interface and passed by IoC, so the IoC will dispose it at the end of the program life cycle. This ...
5
votes
2answers
149 views
Recursively merge dictionaries with generic types in C#
I am looking to implement a method that is capable of merging 2 dictionaries using generics. I've seen several great answers on SO already, but none handle the case of nested dictionaries. As in, what ...
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1answer
131 views
Reducing the size of JSON objects
I wrote a function to reduce the size of JSON objects that works simply by turning every associative array into an indexed one, and moving each property's name to the first row of the data array ...
1
vote
1answer
250 views
Shakespeare and dictionaries
The following snippet will return a list containing the words in all of the works of Shakespeare:
...
2
votes
2answers
53 views
Python script to read CSVs and regroup it into the data types I need
This code does the following:
Read CSV file and determine sub_type based on series_desc.
Turn row into dictionaries ...
4
votes
2answers
432 views
Creating a dictionary from two lists
I have working code here which takes two lists and turns them into a dictionary with the first list being the keys and the second being the values. If the keys exceed the values the value "None" will ...
0
votes
2answers
113 views
Comparing two columns in two different rows
I want to go through each line of the a .csv file and compare to see if the first field of line 1 is the same as first field of next line and so on. If it finds a match then I would like to ignore ...
6
votes
2answers
637 views
The most efficient way to merge two lists in Java
I am looking for a way to merge two files with a list of distinct words, one word per line. I have to create a new txt file that would contain all the words of the first list and all the words from ...
4
votes
2answers
329 views
Return all words which have their reverse present in a string
Problem Statement:
Given a string of words return all words which have their reverse present in the string as ( (word1 , reverseword1 ) , (word2 ,reverseword2) )
Example Case:
Input:
...
