trie

I am trying to write a kind of simple search engine. I have a determined number of main subjects that are associated with specific keywords. The aim is to recognize the main subject from an input partial keyword. I am thinking of using a : Dictionary<string, List<string>> . I'll have to search in this dictionary and find, e.g., all keywords beginning with a 3 characters string and their main subject which is associated. Is my solution the best one ? And how can I efficiently look through those data without having to check manually every List , string by string . Let my know if I'am not clear.

I have a trie (also called a prefix tree). Given a prefix, I want to get a list of ten words that start with the prefix. The thing that's unique about this problem is that I only want 10 of the words that start with the given prefix-- not all of them. There are optimizations that can be made, given this. My code below I know works fine. Each node in the trie has a children property and a this_is_the_end_of_a_word property. For instance, when you insert "hi", this is what the trie looks like: . The problem: Given a prefix, I want to get a list of ten words that start with the prefix. My

My understanding how autocomplete/search for text/item works at high level in any scalable product like Amazon eCommerce/Google at high level was :- Elastic Search(ES) based approach Documents are stored in DB . Once persisted given to Elastic search, It creates the index and store the index/document(based on tokenizer) in memory or disk based configuration. Once user types say 3 characters, it search all index under ES(Can be configured to index even ngram) , Rank them based on weightage and return to user But after reading couple of resources on google like Trie based search Looks some of

Hii , i Was implementing a trie in C ... but i am getting an error in the insert_trie function . I could not figure out why the root node is not getting updated . Please help me with this. #include<stdio.h> #include<stdlib.h> #include<malloc.h> typedef struct { char value; int level; struct node *next; struct node *list; }node; node *trie = NULL; node *init_trie() { node *new = (node *)malloc(sizeof(node)); if(trie == NULL) { new->value = '$'; new->next = NULL; new->list = NULL; new->level = 0; trie = new; printf("\n Finished initializing the trie with the value %c",trie->value); return trie;

I am working with a large set (5-20 million) of String keys (average length 10 chars) which I need to store in an in memory data structure that supports the following operation in constant time or near constant time: // Returns true if the input is present in the container, false otherwise public boolean contains(String input) Java's Hashmap is proving to be more than satisfactory as far as throughput is concerned but is taking up a lot of memory. I am looking for a solution that is memory efficient and still supports a throughput that is decent (comparable with or nearly as good as hashing).

I am trying to get my head around the details of a HAMT . I'd have implemented one myself in Java just to understand. I am familiar with Tries and I think I get the main concept of the HAMT. Basically, Two types of nodes: Key/Value Key Value Node: K key V value Index Index Node: int bitmap (32 bits) Node[] table (max length of 32) Generate a 32-bit hash for an object. Step through the hash 5-bits at a time. (0-4, 5-9, 10-14, 15-19, 20-24, 25-29, 30-31) note: the last step (7th) is only 2 bits. At each step, find the position of that 5-bit integer in the bitmap. e.g. integer==5 bitmap==00001 If

UPDATE 3 Done. Below is the code that finally passed all of my tests. Again, this is modeled after Murilo Vasconcelo's modified version of Steve Hanov's algorithm. Thanks to all that helped! /** * Computes the minimum Levenshtein Distance between the given word (represented as an array of Characters) and the * words stored in theTrie. This algorithm is modeled after Steve Hanov's blog article "Fast and Easy Levenshtein * distance using a Trie" and Murilo Vasconcelo's revised version in C++. * * http://stevehanov.ca/blog/index.php?id=114 * http://murilo.wordpress.com/2011/02/01/fast-and-easy

I'm having difficulty convincing Agda to termination-check the function fmap below and similar functions defined recursively over the structure of a Trie . A Trie is a trie whose domain is a Type , an object-level type formed from unit, products and fixed points (I've omitted coproducts to keep the code minimal). The problem seems to relate to a type-level substitution I use in the definition of Trie . (The expression const (μₜ τ) * τ means apply the substitution const (μₜ τ) to the type τ .) module Temp where open import Data.Unit open import Category.Functor open import Function open import