This tag is for questions about search algorithms, tools, and technologies.

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3
votes
1answer
47 views

Substring searching with Knuth–Morris–Pratt

My program uses the Knuth–Morris–Pratt algorithm to search for a particular substring in a .txt file and then store it in a binary search tree. Note that ...
9
votes
2answers
189 views

Minimum sub-array challenge

Below is my solution to finding the minimum product sub-interval. It passed 8/12 or so test cases, but the other test cases timed out if they hadn't finished within 2 seconds. When I compile this code ...
3
votes
1answer
63 views

Hackerrank's Sherlock and Array

Challenge can be found here Problem Statement Watson gives Sherlock an array A of length N. Then he asks him to determine if there exists an element in the array such that the sum of the ...
1
vote
1answer
23 views

Laravel 4 search function

I am using this code in my controller and would like to know if this is good code to use or if I can write it better, or more compact, and so on. I am just trying to learn from this. It does work, so ...
5
votes
2answers
61 views

Wildcard string search with capture

My goal was to create a function as performant as possible with results being: True/False as to whether wild matches str. ...
7
votes
3answers
392 views

Search string for a substring - indexOf

I am trying to write my own implementation of indexOf for learning purposes. I have an implementation of as follows. I'm sure a more efficient and shorter ...
5
votes
1answer
93 views

First attempt at weighted search

My concern is speed, since this may be used in an e-commerce website I want it to be as quick as possible. Where can I improve? ...
3
votes
2answers
98 views

Multi-threaded domain status checking in Java

I'm tinkering with the idea of crafting a search engine in my spare time. More of a learning experience than anything at this point, but still a project. A key aspect of this system is checking ...
2
votes
1answer
40 views

Yellow Pages Search

I've written code in Free Pascal based on a contest problem (The contest insists that I have to write with Pascal). It works like charm, but I think it still need some improvements, from memory usage ...
2
votes
3answers
62 views

Searching a string of consecutive characters in a binary bar code

I am writing a program that will take a binary bar code and convert it to a zip-code. I need to validate the bar code. A valid binary bar code contains no more and no less than two 1s in any position ...
3
votes
2answers
71 views

Search key in a rotated sorted array without repetition of elements

Is there any improvement possible in this implementation? ...
3
votes
2answers
154 views

Find largest block in matrix

(Largest block) Given a square matrix with the elements 0 or 1, write a program to find a maximum square submatrix whose elements are all 1s. Your program should prompt the user to enter the ...
3
votes
2answers
39 views

Search utility that searches through source code files

I'm working on a search utility that searches through source files. It's only the beginning of the project. It lacks a lot of features, but a backbone of the project works and it would be great if you ...
8
votes
3answers
212 views

Suffix tree implementation in Java

I was trying to solve the problem where given a larger string and an array/list of smaller string, we need to make the determination whether the larger string contains each of the smaller strings. I ...
2
votes
1answer
208 views

HackerRank Grid Search challenge

I’ve written an answer for The Grid Search challenge on HackerRank. Please let me know of any improvements that can be made to my implementation (specifically if there's any way to make the algorithm ...
3
votes
1answer
161 views

Find minimum element in a rotated array

Here's an implementation of finding the minimum element in a rotated array using binary search (one that is sorted in ascending order, and all elements are distinct). Please let me know of any ...
2
votes
1answer
35 views

Song search app with dynamic tables

I decided to make a Ruby app to search for songs, it uses the tinysong API. Things got really cryptic and weird in the view, I managed to get dynamic tables that adjust to data length, but I feel like ...
2
votes
2answers
66 views

Find index of an object with a specific value stored in an array

I am using the following code in order to retrieve the index for an object stored in a JavaScript array. Scripts works fine, but I would like your opinion regarding performance. Also would like to ...
4
votes
3answers
577 views

Nit picking performance on this search code

I am working on a fairly complex (at least it feels complex to me at the moment) search program and am looking to possibly increase the performance. Everything works exactly how I want it to, but I'm ...
4
votes
1answer
153 views

Abstracting the process of finding the index of the maximum in Python

Suppose I want to find the index of the maximal value of a given sequence. In Matlab, this is: [value, index] = max(x) In Python, I would abstract the following ...
2
votes
4answers
168 views

Java String search and replace [closed]

I would like to search a String, and for a certain word, I would like to change only the first 3 letters For example: This is a java institute which insures ...
4
votes
0answers
82 views

Optimizing variadic template pack subsequence matching algorithm

I'm building a small MPL module in one of my utility libraries for fun and learning experience. One of the problems I'm trying to solve is getting a list of all indices where a sequence of types ...
12
votes
2answers
230 views

Finding a word within a pre-defined set using a search string with wildcards

The other day I was intrigued by this question (originally from here): Write a program that answers YES/NO search queries containing * placeholders. Example: if the data you have is (hazem, ...
2
votes
2answers
87 views

A set of names and a request with asterisks

I have a set of names and a request with asterisks. An asterisk can be replaced with any letter. For example, there is a set of names: hasad, ahmed, fizo. And there are a few sample requests: hasad, ...
0
votes
0answers
60 views

Search box in JavaScript for blogger.com

I wanted to build a search box for Blogspot which goes through every label and filters them so remains just the match and every other label is hidden. I work with this through the firefox developer ...
6
votes
2answers
145 views

Find element in sorted matrix

Find an element in a MxN matrix where each row and column is sorted in ascending order. Any comments on my code? (I added some test cases on non square matrices which I did not copy here) ...
1
vote
0answers
50 views

Minimum amount of edges that needs to be traversed to visit all vertices… or something like that

So I have this problem, where I'm given m connections over n vertices. The vertices are labeled ...
7
votes
4answers
103 views

Recursive filename search

I have created a little program to search a set of folders holding documents scanned. The folder structure is as follows: c:\images\year\month\date\documenttype\firstpartofdocumentNo.\ the ...
5
votes
1answer
804 views

Java Word Search Solver

This is a challenge up on Programming Praxis, however there are no Java solutions, and there are few Java implementations elsewhere on the internet. Most of these implementations simply search the ...
8
votes
3answers
1k views

Get values between two dates

I have a search form where users can enter ValidFrom and ValidTo dates, There are three conditions: ...
7
votes
1answer
518 views

Powershell search millions of files as fast as possible

I once asked a similar question but in C#. Now I have the same problem in powershell.. What is the fastest way, to search files newer than 15 minutes, in a file system with more than 1 million files? ...
3
votes
3answers
325 views

Search through .xml files for text that exists anywhere in the file

I have about 1000 .xml files in different sub directories under one root folder. My root directory contains the below structure: RootDir\172\00ad8dc-bff\25.0.xml ...
2
votes
1answer
69 views

Small generic path search framework in Java

I have this small generic path search library. It's not perfect at all, so I need some comments as to have a chance to improve it. com.stackexchange.codereview.graph.model: ...
15
votes
4answers
307 views

Name Filtering using a Trie

This question suggests a different (improved?) implementation for searching/filtering names based on a search query. This is based on the question here: Name filtering in Java A Trie allows the ...
6
votes
2answers
98 views

Name filtering in Java

I have a search box for searching for people in a list of names. Here is the code that runs every time the query changes. I could not find anything open-sourced for this, so I wanted to make sure ...
4
votes
1answer
278 views

Search algorithm to find a point from a given X value

I implement the following algorithm in order to find a point from a given X value in a sorted list with the same distance between each X values. Here's an example of my list content with a delta of ...
5
votes
3answers
210 views

Search arrays for values

I implemented a search function like this: ...
2
votes
2answers
318 views

Fastest way searching specific files

I got thousands of files with a specific file extension in thousands of sub folders. Now, what is the fastest way to search with a pattern? I tried the method ...
4
votes
5answers
834 views

String vs List to check if a country is part of a continent

I simply need to check if a country is part of a particular continent (only one). The continent has around 50 countries. The list is constant and must be initialized at the time of creation. Which one ...
3
votes
2answers
1k views

8 Puzzle solver A* search

I recently created this for a coursework assignment. I am always looking to learn and would like some feedback on my code. Is there any OO principles I'm going against or anything irritating I'm ...
2
votes
3answers
91 views

Searching text for a string

This is my current code: ...
10
votes
1answer
165 views

Karp-Rabin with bitwise hash

As a Rags-to-Riches re-implementation of the Karp-Rabin question here, from @tsleyson, I thought it would be interesting to understand the algorithm better, and to use bitwise-shifting instead of ...
1
vote
1answer
99 views

String search & replace in C

I created a function to do that, and I want to know if there is a problem I'm overlooking about it .. ...
6
votes
1answer
632 views

Excel VBA binary search class module [closed]

I have a long list of sorted strings in a Workbook, and I have to find a lot of values in it. I was hoping to build a binary search Class Module that will find them for me faster than Excel's built-in ...
5
votes
2answers
233 views

Simple search engine using TF-IDF (200 LOC)

I wrote simple search engine based on TF-IDF statistic and cosine similarity. I am still learning Scala, so would be glad to hear comments (here or at GitHub) regarding my code from Scala ...
2
votes
1answer
78 views

Saving search history with many checks and validations inside

I am absolutely confused by saveSearchHistory function. It seems dirty and unobvious. Should I refactor it, and how? SearchHistory.java ...
11
votes
1answer
410 views

Case-insensitive String search in Array

Wrote this function for a Stack Overflow answer. It started off pretty bad but in the end I polished it a bit and now I have something I think to be pretty clean. Actually, when I look at the code, ...
12
votes
5answers
383 views

Fastest way of removing a substring from a string

Taking a break from my C++ series, I recently reviewed the code in this question. I ended up writing my own separate derivation of the function so that I could remove all of the substrings from a ...
3
votes
0answers
98 views

Find binary sequence in NumPy binary array

As part of creating a software defined receiver and decoder, I want to find sync pulses in weather satellite data. The data is first digitized to a 0-1 array. The code below is working. The ...
2
votes
1answer
56 views

MySQL natural search and like search

I have written two queries for searching, but I want to simplify them as it seems needed. ...