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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My own implementation of an hashtable
This is my own implementation of an hashtable. I would like to receive some reviews or some feedbacks.
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1answer
68 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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Initialize a hashmap in a more compact way without external libraries [migrated]
Is there a way to make this code more compact? With less lines without using libraries?
I am using Java 7
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3answers
181 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 ...
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3answers
217 views
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0answers
71 views
OOP paradigm implementation of a Dictionary data model
Below is the implementation of interface Dictionary using chained hash table class HashTableChained.
Despite item 22 says: ...
4
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1answer
43 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:
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3
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1answer
47 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
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1answer
146 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?
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1
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1answer
26 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
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2answers
124 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
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4answers
292 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
81 views
5
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2answers
138 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
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3answers
273 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
40 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 ...
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2answers
202 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.
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5
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1answer
36 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 ...
4
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1answer
90 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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3answers
70 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
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1answer
63 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
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0answers
43 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
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1answer
131 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
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1answer
133 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
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1answer
134 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
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2answers
66 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 ...
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0answers
59 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
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1answer
114 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
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2answers
131 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
102 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 ...
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1answer
242 views
Shakespeare and dictionaries
The following snippet will return a list containing the words in all of the works of Shakespeare:
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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 ...
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2answers
170 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 ...
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2answers
69 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
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2answers
468 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
310 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:
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3
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1answer
77 views
2
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3answers
82 views
Intersection of subset between two lists of dicts
I want to find the intersection of two lists of dicts.
Note that equality—i.e.: what is to appear in the intersection—is given by which keys they must have equal. See the ...
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2answers
100 views
Scraper for words from Wiktionary
I wrote this code in Java using the Jaunt library. The program scrapes all words from Wiktionary from category "English_uncountable_nouns". And after save
each world to text file.
I am not sure that ...
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3answers
164 views
Build a dictionary based on split string
I've written a simple script that takes a string filled with brackets and strings and builds them to a dictionary.
Example Input:
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1answer
95 views
Denormalizing an OrderedDict to CSV
Cross post from stackoverflow, as suggested.
I have an ordereddict, and I need to store it in CSV file.
Input:
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2answers
98 views
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2answers
58 views
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2answers
83 views
Restructuring nested maps
I am in the process of making an assembler and one of the needed steps is actually getting the opcode from a table. However, the instruction set I'm working on has a handful of different addressing ...
2
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2answers
121 views
Add 100 to all values in nested dictionary
I want to change all values in a multidimensional dictionary. I have written this line of code, which does what I want it to do and I am trying to find out if this is the optimal way or just some ...
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2answers
113 views
Dictionary foreach loop with multiple occurences
A little look on what are Dictionaries:
dictWordCounter<string, int>
dictWordPercent<string, double>
topTwentySeven<string, double>
...
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2answers
1k views
Convert a string into a dictionary
I have a string like "food | dairy | milk". The string may consist of more or less words. How do I turn it into a dictionary ...
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2answers
76 views
Inverse mapping of a dictionary
For the below question picked from here:
Write make_inverse_dict(d) that returns a new dictionary with the
'inverse' mapping. The 'inverse' mapping of a ...
2
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0answers
128 views
A map class based on an AVL tree
Here's an implementation of a class which is similar to std::map, but it's not a complete/identical implementation.
I know C pretty well, but am a beginner with ...
4
votes
1answer
109 views
Numerate every item in dict
I have a .json file with a complex structure: dict in a dict, it has no constant structure and is dynamically changed.
The goal is to make new dict where the keys are numbers of hierarchy and values ...
