trie

I am looking for a good introduction/tutorial on Tries . Most of the links I find googling are either too succint and abstract for me or too trivial. Could someone please provide a good reference with examples in Java for me to study? Thanks I've recently coded up a Trie and Patricia Trie in Java. They are written to be easy to follow. All the data structures were built from their Wikipedia descriptions. Related classes: Radix Trie , Suffix Trie , Trie Map . If you have any questions, feel free to ask. Googling found this blog with a series of articles in Java. But I'd recommend buying a text

Given the following... (def inTree '((1 2) (1 2 3) (1 2 4 5 9) (1 2 4 10 15) (1 2 4 20 25))) How would you transform it to this trie? (def outTrie '(1 (2 () (3 ()) (4 (5 (9 ())) (10 (15 ())) (20 (25 ())))))) Greg Fodor Here's a cleaned up solution. This fixes a bug Brian's add-to-trie method since it's currently dependent upon you inserting the seqs in increasing-length order. It also allows querying the trie by prefix, which is a common use case. Note the memory usage here is higher since it stores the values in the leaf nodes of the trie so you can perform searches. (defn add-to-trie [trie x

I am confused as to how the Trie implementation saves space & stores data in most compact form! If you look at the tree below. When you store a character at any node, you also need to store a reference to that & thus for each character of the string you need to store its reference. Ok we saved some space when a common character arrived but we lost more space in storing a reference to that character node. So isn't there a lot of structural overhead to maintain this tree itself ? Instead if a TreeMap was used in place of this, lets say to implement a dictionary, this could have saved a lot more

What I’m trying to do: Build a mobile web application where the user can get help finding words to play when playing scrabble Users get word suggestions by typing in any amount of letters and 0 or more wildcards How I’m trying to do this: Using MySQL database with a dictionary containing over 400k words Using ASP.NET with C# as server-side programming language Using HTML5, CSS and Javascript My current plan: Building a Trie with all the words from the database so I can do a fast and accurate search for words depending on user letter/wildcard input Having a plan is no good if you can’t execute

Possible Duplicate: Where do I find a standard Trie based map implementation in Java? I want to use Trie in Java, is there an implementation I can use ? (I tried looking for one but I didn't found it). There is no trie data structure in the core Java libraries. This may be because tries are usually designed to store character strings, while Java data structures are more general, usually holding any Object (defining equality and a hash operation), though they are sometimes limited to Comparable objects (defining an order). There's no common abstraction for "a sequence of symbols," although

I am fairly new to Programming world. I am trying to create a common regex that would match only list of strings given, nothing more than that. For Eg., given the below list List = ['starguide,'snoreguide','snoraguide','smarguides'] It should create a regex like this - s(((tar|nor(e|a))(guide))|marguides) I implemented a trie. Could only manage to get s(marguides|nor(aguide|eguide)|targuide) I want my regex to be shortened (common suffixes tied together). Is there any better way to shorten the regex I am getting from the trie? To get the desired result try use automata minimization. For your