trie

Trie implementation [closed]

由 北战南征 提交于 2019-11-26 15:05:50
Is there any speed- and cache-efficient implementations of trie in C/C++? I know what a trie is, but I don't want reinvent the wheel, implementing it myself. SashaN if you are looking for an ANSI C implementation you can "steal" it from FreeBSD. The file you are looking for is called radix.c . It's used for managing routing data in kernel. I realize the question was about ready implementations, but for reference... Before you jump on Judy you should have read " A Performance Comparison of Judy to Hash Tables ". Then googling the title will likely give you a lifetime of discussion and rebutals

Where do I find a standard Trie based map implementation in Java?

由 旧时模样 提交于 2019-11-26 10:16:52
I have a Java program that stores a lot of mappings from Strings to various objects. Right now, my options are either to rely on hashing (via HashMap) or on binary searches (via TreeMap). I am wondering if there is an efficient and standard trie-based map implementation in a popular and quality collections library? I've written my own in the past, but I'd rather go with something standard, if available. Quick clarification: While my question is general, in the current project I am dealing with a lot of data that is indexed by fully-qualified class name or method signature. Thus, there are many

How to create a trie in c#

由 旧巷老猫 提交于 2019-11-26 08:59:02
问题 Does anyone know where I can find an example of how to construct a trie in C#. I\'m trying to take a dictionary/list of words and create a trie with it. 回答1: This is my own code, pulled from my answer to How to find a word from arrays of characters? : public class Trie { public struct Letter { public const string Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; public static implicit operator Letter(char c) { return new Letter() { Index = Chars.IndexOf(c) }; } public int Index; public char ToChar() {

How Do I Choose Between a Hash Table and a Trie (Prefix Tree)?

由 主宰稳场 提交于 2019-11-26 06:53:08
问题 So if I have to choose between a hash table or a prefix tree what are the discriminating factors that would lead me to choose one over the other. From my own naive point of view it seems as though using a trie has some extra overhead since it isn\'t stored as an array but that in terms of run time (assuming the longest key is the longest english word) it can be essentially O(1) (in relation to the upper bound). Maybe the longest english word is 50 characters? Hash tables are instant look up

Where do I find a standard Trie based map implementation in Java?

由 柔情痞子 提交于 2019-11-26 03:26:26
问题 I have a Java program that stores a lot of mappings from Strings to various objects. Right now, my options are either to rely on hashing (via HashMap) or on binary searches (via TreeMap). I am wondering if there is an efficient and standard trie-based map implementation in a popular and quality collections library? I\'ve written my own in the past, but I\'d rather go with something standard, if available. Quick clarification: While my question is general, in the current project I am dealing

How to create a TRIE in Python

由 浪尽此生 提交于 2019-11-26 00:32:37
问题 I am new to Python and trying to learn and advance. I am interested in TRIEs and DAWGs and I have been reading a lot about it but I don\'t understand what should the output TRIE or DAWG file look like. Should a TRIE be an object of nested dictionaries? Where each letter is divided in to letters and so on? Would a look up performed on such a dictionary be fast if there are 100k or 500k entries? How to implement word-blocks consisting of more than one word separated with - or space? How to link
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