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

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2
votes
1answer
47 views

Node.js JSON searching & updating

I'm working on a web-based on/off controller for multiple switches. I'm looking for a good way to manage the current state of a switch and updating the current state on change. So far I've got a ...
7
votes
1answer
129 views

Binary search an integer array

I'd like this code to be improved ...
3
votes
1answer
48 views

Simplifying linked list “search and delete” function

The function asks the user for a value to search for, then deletes all matching values in the list. The program runs flawlessly, but I can't figure out a simple/elegant way of separating cases for ...
4
votes
2answers
79 views

Searching through various PDF files

I'm just looking for advice on how I can get my code to operate faster. It's pretty quick right now with searching through 30 3-page PDFs, but I imagine once there gets to be thousands of files to ...
7
votes
2answers
78 views

Program to find the element in an array

I'd like this code to be improved. ...
4
votes
5answers
190 views

Search algorithm for specific values in a 3D array/matrix being super slow

I'm trying to create code that reads a text file (containing (double) numbers between 0 and 1) and filling up a 3D array/matrix (calling it matrix from now on) with ...
2
votes
1answer
104 views

Typeahead Talent Buddy

Problem is Talent Buddy. Your task is to write a function that prints to the standard output (stdout) for each query the user name that matches the query if there are multiple user names ...
1
vote
1answer
45 views

Search a file system for files that match a given pattern

My concerns with this code: Is there a more efficient way to find files by pattern in Python? Does os.walk() work in Windows? Is this code pythonic? Should ...
5
votes
2answers
52 views

Finding the best matching block/patch in Python

I wish to locate the closest matching NxN block within a WxW window centred at location (x,y) of a larger 2D array. The code below works fine but is very slow for my needs as I need to run this ...
5
votes
4answers
181 views

Faster method to find data using search word?

I need to search through a string array to find every occurrence of "Parameters Table", and between each "Parameters Table" and the next, get another string from a specified index (that remains ...
7
votes
4answers
340 views

File text searcher

I have a working version of a logfile searcher that targets a specific directory by extension type, and searches the files for certain words. I'm wondering if my method is the most efficient ...
4
votes
1answer
58 views

“Good” Blob search

I written this code to search 'blob' items (text files) on the basis of their content. For example, if I search for "Good", then the names of files that contain "Good" or "good" should appear in the ...
6
votes
2answers
170 views

Z-Algorithm for pattern matching in strings

I was trying to refactor the following Python code (keeping the same time-complexity) which is an implementation of Z-Algorithm for pattern matching in strings. ...
0
votes
2answers
99 views

How to search for a word in a sorted text file efficiently?

I want to write my own program to search for a word in a sorted text file. In the text file each word is in one line. I want to write this myself because I did not find any simple program (without ...
8
votes
1answer
89 views

Speed up my search

I have a django app with search powered by haystack. The general search goes very quickly, but I need to filter the results by their model type. It works but is very slow. I've never really worked ...
1
vote
1answer
36 views

Correct use of Joins & Wheres

I have 3 tables, 1 where voters information is stored, 2 where their address is stored and 3 where voter id's are matched with address id's. I thought this approach was best as several voters can ...
12
votes
2answers
142 views

Hmm, a thoughtful library

I've been writing far too many routines in JavaScript that get a record from a an object or array based off a matching property, much like jQuery does with DOM elements. Since all the good names are ...
1
vote
1answer
95 views

Multiple search filter like the one in freshdesk in rails

I have requirement to apply multiple filters on database. So I am doing this now. I will have multiple conditions in the front end where the user can select the conditions he wants to filter with and ...
16
votes
10answers
2k views

Find all the missing number(s)

Recently I've attended an interview, where I faced the below question: Question: "There is an sorted array. You need to find all the missing numbers. Write the complete code, without using any ...
1
vote
1answer
55 views

Search a value across 2 array

I want to find the corresponding hash in an array from a string that contains a criterion defined in a hash of the array. I do something like that : ...
1
vote
2answers
64 views

Text file searching using SQL

I have the need to search a directory containing 1000+ files on remote servers where I only have access to SQL Server Management Studio and Explorer. I have written the below SQL statement which does ...
6
votes
2answers
86 views

Searching for files in a specified directory

I am currently writing a program that allows me to search for files in a user-specified directory. My current code is as follows: ...
1
vote
0answers
30 views

Binary search with heurisitcs or something else

Currently I'm using a binary search algorithm to search an index of a tree that represents an XML file. Can I use heuristics to improve the search? What can I do to improve this search function? ...
10
votes
4answers
611 views

Find byte[] in byte[] with Java

I made a search method because I want to use binary data like PNG files. The point of this is to be able to find strings like IEND in a PNG file. I think it works ...
5
votes
1answer
145 views

Searching in a sorted 2D matrix

If I was at an interview, and wrote this code, what would you think? Please be brutal. Time it took to wrote it: 13 minutes Problem: Write an efficient algorithm that searches for a value in an ...
2
votes
1answer
274 views

Search filter list using jQuery

I looked at a search filter code code and edited it to catered to my functional needs. I understood most of the JavaScript except the extend method bit. Can someone explain that? Also, is this the ...
6
votes
1answer
64 views

indexOf() and Boyer Moore methods

I have a method I created which is a custom indexOf(). This code seems ugly to me so I was wondering if anyone could recommend a cleaner and perhaps faster ...
8
votes
5answers
859 views

Efficient pathfinding without heuristics?

Part of my program is a variable-sized set of Star Systems randomly linked by Warp Points. I have an A* algorithm working rather well in the grid, but the random warp point links mean that even though ...
8
votes
6answers
8k views

Fast way of searching for a string in a text file

I have written this code to search for a string in a .txt file. Is it possible to optimize the code so that it searches for the string in fastest manner possible? ...
5
votes
1answer
86 views

My attempt at a weighted search in JavaScript

I tried to make a weighted search function in JavaScript. I've been improving my JS lately but still not sure about some best practices, wondering if there's any improvements I could make, or if I've ...
6
votes
3answers
145 views

How to extract elements from multiple sorted list efficiently?

Problem Statement:- I was ask this interview question recently.. I was able to come up with the below code only which runs in O(k log n)- Given k <= n sorted arrays each of size n, there exists ...
10
votes
2answers
228 views

Finding an element in multiple sorted lists efficiently

I have \$k\$ sorted Lists, each of size \$n\$. Currently I have hard-coded 5 sorted Lists each of size 3, but in general that is ...
8
votes
3answers
523 views

Scrabble algorithm review and performance suggestions

After finishing Project Euler 24, I decided to make a scrabble type of application using /usr/lib/dict as my dictionary what I cat that into a word file. It does take a few seconds, and the dictionary ...
3
votes
2answers
82 views

Searching and comparing a record

I am still a beginner in C++ and I am always curious about good/best coding methods. Let's say I have a program which allows a users to edit the salary of a employee. The system will prompt the ...
10
votes
2answers
4k views

A* search algorithm

NodeData stores all information of the node needed by the AStar algorithm. This information includes the value of ...
4
votes
2answers
152 views

Simple fuzzy text search algorithm

Basically, this code takes a keyword and an array of strings, then sorts them based on two things: the number of characters shared with the key, and the distance between them.(As a side note, would ...
30
votes
11answers
4k views

Searching in an array in less than O(n) time

I have an array where each element is either one less or one greater than the preceding element \$\{x_i = x_{i-1} \pm 1\}\$. I wish to find an element in it in less than \$O(n)\$ time. I've ...
3
votes
1answer
117 views

How to improve this session cache to search faster

I have this code which will store user session credentials: ...
2
votes
3answers
173 views

Improving speed of word search algorithm

I've been working on this word search algorithm and had some issues about its speed. It kinda looks like it takes a little too much time. If anyone could offer suggestions on making this better and ...
2
votes
1answer
221 views

Grid walk problem

CodeEval's "Grid Walk" problem is as follows: There is a monkey which can walk around on a planar grid. The monkey can move one space at a time left, right, up or down. That is, from (x, y) the ...
6
votes
1answer
199 views

Is this implementation of binary search correct?

Is this implementation of binary search correct? Any special or edge cases that I missed out? Maybe it should be optimized for elements that are less than the first element of the array or greater ...
2
votes
0answers
70 views

How to increase concision and performance in a function to retrieve sentences where keywords match?

I'm building a text search system for a web application in PHP. I wrote this function that gets the sentences of the text which contains the keywords used by the user and also highlight them (well, ...
6
votes
2answers
470 views

Search Android contacts more efficiently

Is there is better way to do that more efficiently? onCreate(): ...
0
votes
1answer
27 views

Highlight a pattern found

I made a small web application with a search box. I wanted to highlight the words found in the search. ...
1
vote
1answer
159 views

Wildcard search in C version 2

A few days ago, I posted my version of a wildcard search algorithm, which you can see here: Wildcard search in C Today I'm showing version 2. I didn't want to make it in the same post because the ...
3
votes
4answers
341 views

Wildcard search in C

In the effort to improve my C knowledge, I tried creating a wildcard search function: ...
3
votes
5answers
2k views

Writing out names of files on local C drive to a text document

This program writes out all the files in the current directory level to a text file, outputs an array of sub-directories at the current level, then repeats this process until there are no more ...