longest-prefix

Find the longest common starting substring in a set of strings [closed]

由 流过昼夜 提交于 2020-01-08 17:25:31
问题 Closed. This question is off-topic. It is not currently accepting answers. Closed 4 years ago . Locked . This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. This is a challenge to come up with the most elegant JavaScript, Ruby or other solution to a relatively trivial problem. This problem is a more specific case of the Longest common substring problem. I need to only find the

Longest Prefix Match

由 廉价感情. 提交于 2019-12-11 06:37:37
问题 What's the best way to get accurate and fast queries in PostgreSQL for a longest prefix match? Is it: A.) select * from table where column in (subselect) ; B.) select * from table where strpos(column,column2) = 1 order by length(column2) desc limit 1 ; C.) select * from table where column ~ column2 order by length(column2) desc limit 1 I'm planning to use in an update. Any ideas? 回答1: I wouldn't know of a function doing this out of the box in PostgreSQL. A recursive CTE would be the key

Longest common prefix and suffix of arrays

由 非 Y 不嫁゛ 提交于 2019-12-07 09:30:03
问题 What is the best way to get the longest common prefix (sub-array that starts from index 0 of the original) and suffix (sub-array that ends with index -1 of the original) of two arrays? For example, given two arrays: [:foo, 1, :foo, 0, nil, :bar, "baz", false] [:foo, 1, :foo, 0, true, :bar, false] the longest common prefix of these arrays is: [:foo, 1, :foo, 0] and the longest common suffix of these arrays is: [false] When the elements at index 0/-1 differ in the original arrays, then the

Longest common prefix and suffix of arrays

由 依然范特西╮ 提交于 2019-12-05 15:59:34
What is the best way to get the longest common prefix (sub-array that starts from index 0 of the original) and suffix (sub-array that ends with index -1 of the original) of two arrays? For example, given two arrays: [:foo, 1, :foo, 0, nil, :bar, "baz", false] [:foo, 1, :foo, 0, true, :bar, false] the longest common prefix of these arrays is: [:foo, 1, :foo, 0] and the longest common suffix of these arrays is: [false] When the elements at index 0/-1 differ in the original arrays, then the common prefix/suffix should be an empty array. One possible solution: a1 = [:foo, 1, 0, nil, :bar, "baz",

Java implementation for longest common substring of n strings

由 半腔热情 提交于 2019-12-05 15:04:58
I need to find the longest common substring of n strings and use the result in my project. Is there any existing implementation/library in java which already does this? Thanks for your replies in advance. What about concurrent-trees ? It is a small (~100 KB) library available in Maven Central . The algorithm uses combination of Radix and Suffix Trees . Which is known to have a linear time complexity ( wikipedia ). public static String getLongestCommonSubstring(Collection<String> strings) { LCSubstringSolver solver = new LCSubstringSolver(new DefaultCharSequenceNodeFactory()); for (String s:

Longest common prefix length of all substrings and a string

由 痞子三分冷 提交于 2019-12-01 11:24:33
问题 I found similar questions on StackOverflow, but my question is different. Given a string s contains lowercase alphabet . I want to find the length of Longest common Prefix of all substrings. For example s = 'ababac' Then substrings are as follow: 1: s(1, 6) = ababac 2: s(2, 6) = babac 3: s(3, 6) = abac 4: s(4, 6) = bac 5: s(5, 6) = ac 6: s(6, 6) = c Now, The lengths of LCP of all substrings are as follow 1: len(LCP(s(1, 6), s)) = 6 2: len(LCP(s(2, 6), s)) = 0 3: len(LCP(s(3, 6), s)) = 3 4:

Longest Prefix Matches for URLs

由 时光毁灭记忆、已成空白 提交于 2019-11-28 16:55:16
I need information about any standard python package which can be used for "longest prefix match" on URLs. I have gone through the two standard packages http://packages.python.org/PyTrie/#pytrie.StringTrie & 'http://pypi.python.org/pypi/trie/0.1.1' but they don't seem to be useful for longest prefix match task on URLs. Examlple, if my set has these URLs 1->http://www.google.com/mail , 2->http://www.google.com/document, 3->http://www.facebook.com, etc.. Now if I search for 'http://www.google.com/doc' then it should return 2 and search for 'http://www.face' should return 3. I wanted to confirm

Longest Prefix Matches for URLs

由 半世苍凉 提交于 2019-11-27 10:03:25
问题 I need information about any standard python package which can be used for "longest prefix match" on URLs. I have gone through the two standard packages http://packages.python.org/PyTrie/#pytrie.StringTrie & 'http://pypi.python.org/pypi/trie/0.1.1' but they don't seem to be useful for longest prefix match task on URLs. Examlple, if my set has these URLs 1->http://www.google.com/mail , 2->http://www.google.com/document, 3->http://www.facebook.com, etc.. Now if I search for 'http://www.google

Find the longest common starting substring in a set of strings [closed]

由 百般思念 提交于 2019-11-26 23:41:49
This is a challenge to come up with the most elegant JavaScript, Ruby or other solution to a relatively trivial problem. This problem is a more specific case of the Longest common substring problem . I need to only find the longest common starting substring in an array. This greatly simplifies the problem. For example, the longest substring in [interspecies, interstelar, interstate] is "inters". However, I don't need to find "ific" in [specifics, terrific] . I've solved the problem by quickly coding up a solution in JavaScript as a part of my answer about shell-like tab-completion ( test page
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