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Questions tagged [search]

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

1
vote
3answers
29 views

Java TreeMap.floorKey() equivalent for std::map

I wanted something equivalent to this Java program: ...
4
votes
0answers
65 views

Rabin-Karp algorithm implementation

This code uses the Rabin-Karp algorithm to compare two text files. It takes a few minutes when both files contain around 1000 words. How can I improve? ...
3
votes
1answer
43 views

Enhancing search using Fuzzy Logic in NodeJS

Brief Description: In my NodeJS Application, I have a model called User. User.js ...
3
votes
0answers
35 views

reverse recursive search on an object with javascript - like tree search

I implemented a tree search with JavaScript. It has below basic rules. It will search over an array of objects which has recursive(like fractal) If it found a according data in a leaf(the final ...
4
votes
1answer
55 views

Preperiodic, periodic or aperiodic binary string

This is extension of the rep-string task from Rosette code. I do not only want to check if the input string is the shortest periodic string (rep-string) or not, but also check if it is preperiodic. ...
3
votes
0answers
46 views

Python log entry search utility

I wrote a small utility for searching our web app log files for certain strings. The idea is that if the search string is found somewhere in the entry, the entire entry should be printed. The ...
4
votes
1answer
70 views

Filter for CANbus frames

The actual data types here are probably not relevant to post an answer. I use Qt types here, but the question should apply for other structured types as well. I ...
4
votes
1answer
84 views

Knuth-Morris-Pratt algorithm in C++

First of all, I know there is huge amount of information about KMP on the internet but many examples are just the code without any explanation. So I've decided to implement it on my own. Secondly, I ...
0
votes
0answers
76 views

Dictionary search: compare many values in a dictionary using keys

What I have: Mainly, a graph consists of 10000 nodes and around 500000 edges. I would like to construct a dictionary where keys are the edges and the value for each edge is an array consists of 0, ...
2
votes
1answer
42 views

Primitive full-text search on some properties of an object

I am not a JS/TS Guru, so i wanted to ask if one could write this better. I needed a very primitive Full-Text-Search of some properties of an Object. What do you think? ...
0
votes
1answer
68 views

Combinational string search using Java

I wrote a program that receives 2 strings (Input and Search) in the Search string. The sign '+' indicates that if the substring before the '+' exists in the Input string. (The search string cannot ...
4
votes
0answers
52 views

Array Search Algorithm

Recently, I've been experimenting with an array searching algorithm that I'm not sure I've seen anywhere (minor references here). I'm still not fully-learned on how to state the efficiency of what I'...
6
votes
2answers
895 views

Find a best fuzzy match for a string

I am trying to find a best match for a name within a list of names. I came up with the below code, which works, but I feel that the creation of the intermediate ...
2
votes
0answers
64 views

String search function in typescript/angular

I'm trying to return a list of objects called orders based on a string search that the user enters. orders has a ...
3
votes
2answers
51 views

Listing the playlists on which each song appears

I created a way to export my Google Play playlists to a text file and also a way to export all of my songs in Google Play to a text file. Now I have both the song list (in an array format) and ...
1
vote
2answers
90 views

Calculating the minimum and maximum of a byte array [closed]

I've been working with binary files with this last assignment and part of it was to determine the maximum and minimum byte. Initially this was 2 functions but a bonus portion was to make them into 1 ...
2
votes
1answer
60 views

Locate substrings within a file

Here, I am reading in a newline delimited file that can be millions of repeating lines that looks like this: ...
1
vote
1answer
76 views

PHP code for search page

Want to show you part of code that I wrote to process search request. User commit search by articles (codes) of products. The goal is to allow user write his search request to textarea element in any ...
4
votes
0answers
50 views

Improved Knuth-Morris-Pratt over a source of indeterminate length

Following the successful review of my previous implementation. Please review my new, generic implementation of the Knuth-Morris-Pratt algorithm. Its modified to search a source of indeterminate ...
4
votes
2answers
99 views

Knuth-Morris-Pratt over a source of indeterminate length

Please review my generic implementation of the Knuth-Morris-Pratt algorithm. Its modified to search a source of indeterminate length in a memory efficient fashion. ...
3
votes
2answers
186 views

Go grep command clone

I am trying to make a simple clone of the command line utility grep. I'm working on it just for fun and to practice Go. The thing is, I am trying to make it in a way that if several files are given at ...
2
votes
1answer
82 views

Scheme: FSM substring search

I have been working on a function that return a FSM that searches a specific word based on the argument of the constructor. The idea was to use those routines as means to learn about regular ...
3
votes
1answer
48 views

Search indexing of Battle Mech Loadouts

Background I am since a long time ago developing a JavaFX application for creating and analysing 'Mech loadouts for Mechwarrior Online. I previously had a very crude search function based on a ...
0
votes
1answer
164 views

Generic Binary Search Tree Implementation in Java

There is an implementation of Binary Search Tree. This is kind of based on Set Theory that duplicates are not allowed but an attempt to adding the same node twice will replace the older node. BSTNode ...
0
votes
1answer
251 views

Rabin-Karp String matching

I am learning algorithms and have implemented the Rabin-Karp string search algorithm. I didn't implement a rolling HashCode, but it's judged correct by this ...
3
votes
1answer
232 views

Search for rows in a 2D array that contain a given sequence

I have a 2d array of m * n dimension (m and n can vary from 1 to 100000). The following snippet of code checks if the sequence exists in the row and stores the index if it exists. The time taken by ...
2
votes
1answer
330 views

String search algorithm for finding if a long list of long strings string exists in a similarly sized haystack

My use case is that I have a list of emails and I need to find if the email is in the chain: ...
1
vote
2answers
2k views

Finding specific small byte arrays in large binary files

I'm trying to quickly and efficiently find every recurring position of small byte arrays (4 bytes) in large binary files (several GBs). My current method is as follows: ...
2
votes
2answers
83 views

Check if specific pattern exists in another array and save the index

Let's say I have this pattern and a large array: ...
2
votes
0answers
210 views

React widget to display, sort and search remote data

I've created a React widget that pulls data on crypto-token pairs from a remote API and makes that data sortable by headers and searchable. You can view a demo of it here. Is this a maintainable way ...
6
votes
1answer
102 views

Personal School Course Scheduler

A good friend of mine had the challenge of trying to build a schedule using all available times and classes through a spreadsheet... by hand. He asked me if I could build a program to generate valid ...
3
votes
1answer
77 views

A-Star Search with 3D Universe

I am attempting to write up a program in Python that will find the shortest path between two nodes in 3D space. The actual domain is the EVE-Online Universe, which is composed of systems connected by ...
2
votes
3answers
813 views

Insertion of a node in M-way search tree

I am currently studying data structures and i am looking to see if my implementation of the insertion method in an M-way search tree is good and i am looking forward to improving my coding approach. ...
6
votes
2answers
369 views

Find the second largest number in an array with at most n + log2 n - 2 comparisons

This exercise is from Roughgarden's (excellent) course on algorithms on Coursera: You are given as input an unsorted array of n distinct numbers, where n is a power of 2. Give an algorithm that ...
3
votes
1answer
65 views

Finding an index in an array of objects with 3 possible outcomes

currentUserPosts will have a post object with an id that either matches a tempId, an ...
2
votes
0answers
452 views

C++ implementation of Monte Carlo Tree Search with Python wrapper

Important Prebuilt Python Extensions built for Python 3.6 Includes Python f-strings (3.6+) Complementary GitHub link https://github.com/thejhonnyguy/CPyMCTS Notable: Previous attempt with stock ...
-5
votes
2answers
865 views

Searching with multiple filters [closed]

I was looking for optimizing a search method for an assignment where I had to search a file for employees, I should be able to search by having any of the four filters or even none; I've imagined it ...
6
votes
2answers
2k views

DFS in a binary tree

Problem statement: Perform a depth first traversal on a BST and print the elements traversed. ...
2
votes
4answers
10k views

Searching for a specific object in an ArrayList [closed]

Is this an efficient way to search for a specific object in an ArrayList? Product is the superclasS. Mobo, CPU, RAM, GPU... are the subclasses. ArrayList(called stock) stores Product objects. I ...
3
votes
1answer
319 views

Knuth–Morris–Pratt string search algorithm

I finally think I've implemented the Knuth–Morris–Pratt string search algorithm correctly, now time for that lovely criticism that causes me to learn! The code doesn't look all that pretty however it ...
4
votes
1answer
154 views

Filling a string at minimal cost

I'm solving the following problem. Here is the problem statement: You are given a string with wildcards, e.g. X***Y*Z. Your goal is to print an input string ...
12
votes
5answers
877 views

Find all words that satisfy unknown letters (Hangman)

I have been working on a function which might be used to solve a word game like Hangman or "Wheel of Fortune". Basically, I wish to search from a very large ...
1
vote
1answer
673 views

Searching for column-indices of a multi-dimensional array that match multiple conditions (one condition per row)

I have written a script that I believe works and covers all edge-cases. I am curious about ways to improve upon speed. While the given example below covers a multi-dimensional array of ...
4
votes
1answer
382 views

Nearest Neighbor Algorithm (general nearest, forward-nearest, or backward-nearest)

I am trying to write an algorithm that can find user-specified nearest neighbors. By user-specified, I mean that the user can specify whether it's a general nearest neighbor, a forward-nearest ...
3
votes
2answers
374 views

C# A* Pathfinding implementation, focusing on reusability and efficiency

I wrote a C# A* pathfinding (Though, it's generic enough that it could be used for other search purposes) implementation. I started this when I found that existing implementations often didn't support ...
0
votes
3answers
70 views

Equals and Contains for text search

I am trying to implement a search routine for an application written in C#. The requirements are as follows: The user can select one of the following options for search: ...
2
votes
3answers
74 views

search for text across multiple tables

I've got the following query. ...
1
vote
2answers
101 views

Search a unique list and search a larger list to set dictionary with keys of binary values

I would like to search a list of unique values and create a dictionary with those unique values as keys, and a binary list for whether those values occur. I have successfully solved this, but would ...
0
votes
2answers
55 views

SQL Server Multi Term Wildcard Search on Multiple Fields with Ranking

I've built up this search query for searching airport locations on multiple fields, but I don't particularly like the way it works in practice. Even though it is fairly cool. I'll be reverting back to ...
3
votes
1answer
2k views

Filtering parent and children elements of list of dictionaries

I have a list of dictionaries and its elements has id and parent_id fields. Main purposes: If the parent_id field of an element is defined, it should be returning the rest of elements except itself. ...