trie

How Immutability is Implemented

由 我是研究僧i 提交于 2021-02-07 11:45:08
问题 I am trying to grasp how the trie and such in immutability is implemented, as relates to immutability in JS. I understand how there is supposed to be significant structural sharing. My question is say you have a graph sort of structure like this: a -- b | c | d -- h | e -- i -- l | f -- j -- m | g -- k -- n So then you add an x to the system. I'll try it two different ways: a -- b | c | d -- h -- x | e -- i -- l | f -- j -- m | g -- k -- n That one is just added as a leaf node. a -- b | c | d

Python: Trie树实现字典排序

由 坚强是说给别人听的谎言 提交于 2020-03-02 02:18:24
一般语言都提供了按字典排序的API，比如跟微信公众平台对接时就需要用到字典排序。按字典排序有很多种算法，最容易想到的就是字符串搜索的方式，但这种方式实现起来很麻烦，性能也不太好。Trie树是一种很常用的树结构，它被广泛用于各个方面，比如字符串检索、中文分词、求字符串最长公共前缀和字典排序等等，而且在输入法中也能看到Trie树的身影。 什么是Trie树 Trie树通常又称为字典树、单词查找树或前缀树，是一种用于快速检索的多叉树结构。如图数字的字典是一个10叉树： 同理小写英文字母或大写英文字母的字典数是一个26叉树。如上图可知，Trie树的根结点是不保存数据的，所有的数据都保存在它的孩子节点中。有字符串go, golang, php, python, perl，它这棵Trie树可如下图所示构造： 我们来分析下上面这张图。除了根节点外，每个子节点只存储一个字符。go和golang共享go前缀，php、perl和python只共用p前缀。为了实现字典排序，每一层节点上存储的字符都是按照字典排序的方式存储(这跟遍历的方式有关)。我们先来看看对单个字符如何进行字典排序。本文只考虑小写字母，其它方式类似。'a'在'b'的前面，而'a'的ASCII码小于'b'的ASCII码，因此通过它们的ASCII相减就可以得到字典顺序。而且python内置了字典排序的API，比如： #!/usr/bin

Trie tree crashing in Android

由 落爺英雄遲暮 提交于 2020-02-25 05:18:26
问题 I implemented a Trie tree in Java and it worked fine with a dictionary of about 80,000 words but when I implemented it in my Android app it started to Force Close. I tested it with a dictionary that has only a few words and it worked fine which makes me believe that the size of the dictionary is causing the crash in my Android simulator. Does anyone know why? 回答1: Android applications have a limit of 16MB RAM per application, probably you run out of memory. When you do a test on an ordinary

Looking for a good introduction on trie [closed]

由 一曲冷凌霜 提交于 2020-02-19 04:57:42
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . 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 回答1: I've recently coded up a Trie and Patricia Trie in Java. They are

Looking for a good introduction on trie [closed]

由 假如想象 提交于 2020-02-19 04:56:53
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . 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 回答1: I've recently coded up a Trie and Patricia Trie in Java. They are

Looking for a good introduction on trie [closed]

由 六月ゝ 毕业季﹏ 提交于 2020-02-19 04:56:25
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . 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 回答1: I've recently coded up a Trie and Patricia Trie in Java. They are

Is there any way I can speed up this VBA algorithm?

由 僤鯓⒐⒋嵵緔 提交于 2020-01-13 08:07:46
问题 I am looking to implement a VBA trie-building algorithm that is able to process a substantial English lexicon (~50,000 words) in a relatively short amount of time (less than 15-20 seconds). Since I am a C++ programmer by practice (and this is my first time doing any substantial VBA work), I built a quick proof-of-concept program that was able to complete the task on my computer in about half a second. When it came time to test the VBA port however, it took almost two minutes to do the same --

Is there any way I can speed up this VBA algorithm?

由 吃可爱长大的小学妹 提交于 2020-01-13 08:06:52
问题 I am looking to implement a VBA trie-building algorithm that is able to process a substantial English lexicon (~50,000 words) in a relatively short amount of time (less than 15-20 seconds). Since I am a C++ programmer by practice (and this is my first time doing any substantial VBA work), I built a quick proof-of-concept program that was able to complete the task on my computer in about half a second. When it came time to test the VBA port however, it took almost two minutes to do the same --

What would be a sensible way to implement a Trie in .NET?

由 亡梦爱人 提交于 2020-01-12 15:27:06
问题 I get the concept behind a trie. But I get a little confused when it comes to implementation. The most obvious way I could think to structure a Trie type would be to have a Trie maintain an internal Dictionary<char, Trie> . I have in fact written one this way, and it works , but... this seems like overkill. My impression is that a trie should be lightweight, and having a separate Dictionary<char, Trie> for every node does not seem very lightweight to me. Is there a more appropriate way to

How to store PHP Trie for all later uses?

由 痴心易碎 提交于 2020-01-07 03:48:20
问题 I'm designing an application in PHP which involves Trie data structure. For time efficient prefix search, I'm using Trie. I'm constructing the Trie using records from the database. Now, the database has millions of records. So it is not feasible to everytime create the Trie and then search in it, for every new user request. Instead can I create the Trie only once and somehow store this information, such that it does not have to be re-created for every new user request, and then searching can
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