suffix-tree

A suffix array will index all the suffixes for a given list of strings, but what if you're trying to index all the possible unique substrings? I'm a bit new at this, so here's an example of what I mean: Given the string abcd A suffix array indexes (at least to my understanding) (abcd,bcd,cd,d) I would like to index (all the substrings) (abcd,bcd,cd,d,abc,bc,c,ab,b,a) Is a suffix array what I'm looking for? If so, what do I do to get all the substrings indexed? If not, where should I be looking? Also what would I google for to contrast "all substrings" vs "suffix substrings"? The suffix array

Given a dictionary of words and an initial character. find the longest possible word in the dictionary by successively adding a character to the word. At any given instance the word should be valid word in the dictionary. ex : a -> at -> cat -> cart -> chart .... The brute force approach would be to try adding letters to each available index using a depth-first search. So, starting with 'a', there are two places you can add a new letter. In front or behind the 'a', represented by dots below. .a. If you add a 't', there are now three positions. .a.t. You can try adding all 26 letters to each

This question already has an answer here: Ukkonen's suffix tree algorithm in plain English 7 answers I'm doing some work with Ukkonen's algorithm for building suffix trees, but I'm not understanding some parts of the author's explanation for it's linear-time complexity. I have learned the algorithm and have coded it, but the paper which I'm using as the main source of information (linked bellow) is kinda confusing at some parts so it's not really clear for me why the algorithm is linear. Any help? Thanks. Link to Ukkonen's paper: http://www.cs.helsinki.fi/u/ukkonen/SuffixT1withFigs.pdf Find a

What are the maximum and minimum number of nodes in a suffix tree? And how can I prove it? Assuming an input text of N characters in length, the minimum number of nodes, including the root node and all leaf nodes, is N+1 , the maximum number of nodes, including the root and leaves, is 2N-1 . Proof of minimum: There must be at least one leaf node for every suffix, and there are N suffixes. There need not be any inner nodes, example: if the text is a sequence of unique symbols, abc$ , there are no branches, hence no inner nodes in the resulting suffix tree: Hence the minimum is N leaves, 0 inner

Just wondering if you are aware of any C based extension in python that can help me construct suffix trees/arrays in linear time ? Abhijeet Rastogi You can checkout the following implementations. http://www.daimi.au.dk/~mailund/suffix_tree.html https://hkn.eecs.berkeley.edu/~dyoo/python/suffix_trees/ https://github.com/kvh/Python-Suffix-Tree A guy improved (first one) and put it here. http://researchonsearch.blogspot.com/2010/05/suffix-tree-implementation-with-unicode.html All are C implementations. 来源： https://stackoverflow.com/questions/8996137/suffix-tree-implementation-in-python

I am reading about Tries commonly known as Prefix trees and Suffix Trees . Although I have found code for a Trie I can not find an example for a Suffix Tree . Also I get the feeling that the code that builds a Trie is the same as the one for a Suffix Tree with the only difference that in the former case we store prefixes but in the latter suffixes. Is this true? Can anyone help me clear this out in my head? An example code would be great help! Ze Blob A suffix tree can be viewed as a data structure built on top of a trie where, instead of just adding the string itself into the trie, you would