In mathematics and computer science, an algorithm is an effective method expressed as a finite list of well-defined instructions for calculating a function. Algorithms are used for calculation, data processing, and automated reasoning.

learn more… | top users | synonyms (1)

-4
votes
0answers
38 views

How many ways to get a fixed number that is the sum of three numbers? [on hold]

Let's say you want to find out how many ways there is to make the number 5 using three numbers, which are added together. These are some of the ways: 005 => 0 + 0 + 5 = 5 122 => 1 + 2 + 2 = 5 ...
-6
votes
0answers
18 views

How do I write a reddit bot which will post stuff on a daily base? [on hold]

I want to program a bot for reddit. Where do I start? I need to solve following things (in pyhton): Log in with an account. Post comments on threads in a special subreddit. On a Daily base. For the ...
-4
votes
0answers
24 views

How to calculate the runtime and compare them? [duplicate]

The asymptotic notations are very confusing. Can someone help me on how to calculate the run times? For example: big O for the following loop -- sum = 0; for (i = 1; i < = n*n; i++) for (j = ...
-1
votes
1answer
96 views

What is the 'Basic Operation' of a block of code? [on hold]

During my lectures on advanced algorithms my professor has been giving us statements of code and asking us to determine the 'most basic operation' of that block of code. It's a bit ambiguous and my ...
-5
votes
0answers
181 views

What can an algorithm look like that chooses appropriate images or songs? [on hold]

My goal is to automatically create a slideshow of images if either a directory or images or an audio file is given. In the former case, software should find an appropriate audio file from a library. ...
-1
votes
0answers
37 views

Best many to many match and sort algorithm

Im looking for best algorithm to match and sort many to many values I have "book" which have many orders in many stacks (max capacity of stack is for example 10). Each orders have many products. Each ...
-1
votes
1answer
77 views

Algorithm for solve combinatorics (clique search)

We have a group of animals: animals = {'dog', 'wolf', 'cat', 'lion', 'rabbit', 'bear'} And know a list of conflicts conflicts = ( {'dog','cat'}, {'dog','rabbit'}, {'wolf','rabbit'}, ...
0
votes
0answers
16 views

Extract the main entity from a body of text for text categorisation?

I'm trying to categorise products based on various fields of data. I've had some success just matching search terms in the product names, but this naive approach doesn't work when it comes to larger ...
0
votes
0answers
94 views

Interaction between code and user interface

I'm developing a desktop app that has many different algorithms implemented. Some algorithms require additional input from user, this info might not be known before algorithm has started. My ...
0
votes
1answer
93 views

Algorithm to get all possible forms of a word with varying suffixes

I'm writing an application in javascript where given a word, I need to get all the possible versions of the word with the suffix being the difference between each form. For example: "sponsor" should ...
3
votes
4answers
183 views

Selecting a CPU or microcontroller needed for a given software application?

Say I had a software algorithm (for example, an FFT), and I need it to process (n) amounts of data in (t) milliseconds. This is a real-time task written in C. There are a lot of CPUs out there, and ...
-2
votes
1answer
35 views

Considerations when making data structure and algorithm choices [closed]

What are some reasons you may choose a worse runtime algorithm? And what are some advantages of a linked list vs a hash table/array where access is constant time.
-4
votes
0answers
22 views

Getting directions using my own voice samples regarding a gpx track [closed]

My goal is to create an app in android that loads a gpx track Compares my gps position to the track and gives me directions using my own voice (samples) as in Go to the right soon Go to the left ...
0
votes
1answer
24 views

Implementing CMA-ES

I am attempting to implement the CMA-ES optimization algorithm in my favorite language (using the example code here as a guideline), but I need help solving a problem I am having. To test the ...
2
votes
1answer
121 views

Word game algorithm

Back in the days of 8-bit machines there existed an educational word game. I have no idea what it was actually called but for the sake of this question (since it involves pyramids) let's call it ...
1
vote
0answers
43 views

Find minimum number of steps to a goal without estimator for how close intermediate steps are to the goal

I've been trying to find a good way of solving the following problem, but I'm not sure how to even frame it. I think there might be relatively well-known solutions I'm not familiar with, since I don't ...
7
votes
3answers
244 views

Generate equally sized areas in polygon

I am looking for a pseudo code logic that would find n equally sized areas in a given polygon. No space should be between or outside the matched areas. First valid match of areas should be returned. ...
2
votes
0answers
34 views

Polygon simplification that encloses original set of points

I have been trying to implement an optimization for 2D sprite rendering to fight the problem of limited fillrate on mobile devices. The idea is to render textured polygons instead of quads that will ...
1
vote
2answers
69 views

Find all paths in a tree type of structure

The language I am using is C#, but I am looking more for help with the algorithm more than I am concerned with which language. I have been trying to develop this algorithm for a while now and I can't ...
0
votes
2answers
110 views

How to approach hours forecasting

I have a django web app and I basically need to forecast budgeted hours for 2 departments to help them schedule staff as currently the best they can do is just wing it. When we receive a job proposal ...
-3
votes
1answer
71 views

How are things like lists allocated in memory? [closed]

When I read about amortized analysis it mentions how when a list is full it has to re-allocate a list of even bigger size and copy all the elements over. My questions: Where is the list stored in ...
2
votes
1answer
67 views

Divide the world map into fixed sized blocks

I am developing an app where I need to divide the entire world map into fixed sized square blocks. For simplicity, think of it as a problem of dividing the google maps into a fixed sized block. I can ...
3
votes
1answer
86 views

Prorating a license (its expiry) dependent on feature add-ons

I've ran into a problem trying to calculate prorating of a service. Hoping to get some help/hint from the community. I apologize if this isn't the right place to ask this question - will appreciate ...
4
votes
1answer
54 views

Finding similar high dimensional vectors

I have two lists (sizes m and n) containing high dimensional bit-vectors. All vectors have the same number of dimensions and use Hamming distance as measure if distance. For each element in the first ...
0
votes
2answers
146 views

Optimization problem where to start, what algorithms to use? [closed]

I have an optimization problem and I was wondering where to start from to be able resolve it. I think it can be solved with an NP-complete algorithm but I am not sure where to start from. The problem ...
2
votes
2answers
70 views

Retrieving an incorrectly stored tree data structure

Way back in the hazy origins of our platform it was decided that we were going to need some hierarchical data structures stored in the RDBMS. The relationships between nodes were stored via a ...
2
votes
1answer
106 views

Improving sampling algorithm

I am having a bit of trouble designing a new feature at the moment. It is part of a resource management system. I was wondering if anyone has experience doing anything similar. I'll try to explain: ...
3
votes
1answer
92 views

JavaScript functional conversion from flat list to tree

I've been going through the RxJS tutorials http://reactivex.io/learnrx/. Almost all of the exercises involve moving from a hierarchical structure to a flat structure so I thought I'd try to do the ...
3
votes
0answers
55 views

Generate quantity distribution of objects to reach goal for each attribute

The Problem Suppose we are given a variable-length list of objects containing a fixed-length list of positive decimal numbers as attributes. JSON Example [ {a: 0.1, b: 0.6, c: 0.0}, {a: ...
4
votes
1answer
127 views

Name-Based Sorting Algorithms For Maximized Common Letters

I am attempting to write a program for a competition (we're allowed to consult Stack Exchange, as long as I'm not given physical code) that takes in a list of 5000 people's names (distributed fairly ...
1
vote
1answer
127 views

Algorithm to get all paths in a tree

I have a tree that has n-levels. For example here I have four levels: Each node has two children (except for the last one), however everyone except for the first and last node of each row has two ...
2
votes
1answer
100 views

Is this Red-Black tree insertion pseudocode from Introduction to Algorithms (CLRS) correct?

For the Red-black tree insertion fixup the book distinguishes between 6 cases, 3 of which are symmetric. The cases are (z is the node being inserted): Case 1: z's uncle is red Case 2: z's uncle is ...
5
votes
0answers
60 views

Algorithm to generate Edges and Vertexes outwards from origin with max multiplicity of 3

I am creating a 2d game for a website where the universe can grow extremely large (basically infinitely large). Initially, the universe is composed of 6 stars that are an equal distance from the ...
1
vote
4answers
140 views

Should I be using any algorithm to sort/find items, or use a language's built-in ways?

I'm currently a first semester IT student, and I'm wondering if it's better to write my method to find something e.g. in a C# List, or to use any built in method to do these, such as LINQ or .Find or ...
4
votes
4answers
309 views

How to design a function that takes a date and gives out a number between 1-6, always the same for all dates

As a part of an algorithm I'm making I need to make a function that takes the current date to a function and gives out a number between 1-6, and not the same number for two consecutive dates. And it ...
-1
votes
1answer
75 views

Create arithmetic expression from number using +-/* that equals target [duplicate]

For example, you are given the source 1234 and the target 24. The task is to use the standard arithmetic operators +-/* placed within source, without changing the order of the digits of source to ...
5
votes
2answers
99 views

Find path of steepest descent along with path length in a matrix

Came across this problem -- You are given a grid with numbers that represent the elevation at a particular point. From each box in the grid you can go north, south, east, west - but only if the ...
0
votes
0answers
197 views

What is a lattice parser?

My friend asked me for help with his task: "Redeem a lattice parser with any programming language" - the problem is that he can't clearly explain me how the lattice parser should work. I've tried to ...
6
votes
2answers
194 views

Efficient algorithm to merge n successive sorted arrays in place

I am developing an in-place sorting algorithm that leaves the array into a state where it is basically a succession of sorted subsequences of any size (most are bigger than log2(size(array))); then it ...
0
votes
1answer
138 views

Do you know the name of this algorithm? (cycle with history?)

Context : I'm a IT student who is trying to implement a small application for my family. Every year, we offer each other gifts. Each one of us pick a name of a family member in a hat, and have to ...
1
vote
0answers
39 views

Graph grouping with criteria

I start with a list of adjacent tetrahedra, where there are tight seals to one another along faces for two tetrahedra that are adjacent. The vertices belonging to these faces for both tetrahedra are ...
4
votes
1answer
52 views

How to generalize the planar case of the closest pair problem to d dimensions?

I'm trying to create a solution for the Closest pair problem using d-dimensional points. I've done a thorough search on google but it seems that there is no explanation for the d-dimensional case ...
3
votes
4answers
327 views

Which algorithm is performant for matrix multiplication of 4x4 matrices of affine transformations

I am wondering what is a good, performant algorithm for matrix multiplication of 4x4 matrices. I am implementing some affine transformations and I am aware that there are several algorithms for ...
4
votes
1answer
115 views

Single Source Shortest Path

In the lecture we are taught that we can solve All Pairs Shortest Path(APSP) with matrix multiplication. In APSP we are creating a distance table for all the distances between each nodes in the ...
0
votes
0answers
67 views

Compute the permutations for a set of numbers and then run each to find every possible schedule that fits a client constraints

I am building a Java program that computes the permutations for a set of numbers and then runs each of those permutations to find every single possible schedule that fits a client constraints. The ...
2
votes
1answer
78 views

Algorithm for best subset of items

I have a matrix M with size NxN where each position M(i,j) is an integer representing the relationship between item i and j. If i and j are the same item then the positions M(i,j) and M(j,i) are 0. ...
-1
votes
3answers
134 views

Balanced folder increment

I want to map an integer (let's say 32bits) to a valid path. The integer is an autoincrement value stored in the database. I also don't want at any case any folder to have more than N subfolders. ...
3
votes
1answer
95 views

Finding xor sum in a tree

I was trying to solve this problem on hackerearth where you have a tree with values on each node and you have to answer queries that ask what is the xor sum between two nodes. Also, there are updates ...
9
votes
4answers
449 views

What is the most efficient way to store this data?

I am in charge of rewriting some old VB code. I understand how it works, but I feel like there is a far-more efficient way to do what they did. I just can't figure out what it is. Here is a contrived ...
0
votes
2answers
304 views

How to scramble a word, keeping first and last characters the same?

I have a task, which is to scramble a single word, whose size is greater than 3 letters. The scrambled word must not be equal to the original, and the first and last letters of the word must remain ...