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.

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Weight-maximizing (weighted vertices) path algorithm

I am looking for description (name of algorithm, code, pseudocode, etc.) that can help me frame this problem and find the appropriate recursion and the most efficient solution. Problem: Given a ...
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3answers
2k views

Time-complexity of nested for loop

I have loops like this: for(int i = 0; i < n; i++) { for(int j = 0; j < i; j++) { sum += 1; } } It's O(n * ), but I'm not sure what the j < i loop is. I have some tests ...
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311 views

How to trace logical errors in algorithms [closed]

I am beginner in algorithms. Last year I participated in Google Code Jam. One of the major issues I faced during the competition was my code was working fine on my test cases, but when I submitted on ...
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133 views

Bloom filters or similar, but with no false positive

To improve some lookups, I am considering the use of Bloom Filters. But in my use-case, the most probable outcome is that the element do exists in the target set. Bloom filters can have false ...
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641 views

proposed algorithm and representation of an algorithm

What is the difference between an ambiguity in a proposed algorithm and an ambiguity in the representation of an algorithm? I have done some research and found out that ambiguity in the ...
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4answers
974 views

Is there any specific reason to use “else if” clause?

We all use if ..else if.. else. But still I'm confused as to why we use else if. Where if does the same thing as else if. So why are we using else if? Any specific reasons behind this? Is there ...
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1answer
146 views

How to do inference in a card game?

In the game there are 5 players, each with 8 cards in hand. No other card is present. Using Monte Carlo (MCTS) I run many simulations of the game from the current state to the end of the match. In ...
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2answers
544 views

What graph traversal algorithm should I use?

I would like to write an algorithm which can traverse a graph and hopefully later I can implement it to use for an indoor navigation system. The graph would come from floor plans of a building and ...
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400 views

Quick algorithm to find matches between two arrays

I'm faced with the following problem: I have an array which is produced by the parsing of a yaml file which contains patterns in the following structure. "Programming books" Title: a ...
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1answer
426 views

Fast fourier transform based multiplication algorithm [closed]

Can someone explain how to do the Fast fourier transform based multiplication algorithm in very large numbers more clearly? I've been searching for this a lot and I'm having a very hard time because ...
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6answers
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TDD and complete test coverage where exponential test cases are needed

I am working on a list comparator to assist sorting an unordered list of search results per very specific requirements from our client. The requirements call for a ranked relevance algorithm with the ...
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4answers
2k views

Complexity in nested loops

Foreword: In this post, I will make the common confusion between O(n) and Theta(n) as complexity notations. I will write pseudo-code to talk about algorithms, using whatever notation I find to my ...
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324 views

Will interns and entry level positions care more about algorithms or projects/experience [closed]

I am 3 months into learning java, read head first java and made 4 things on my github + many small things. I also started learning android this month, but now am tossing and turning not knowing my ...
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1answer
240 views

Fully Stable, In-Place Unique Algorithm in O(n)

Is there an algorithm that, given a sorted array, swaps all the first unique elements to the beginning of the array and the duplicates to the end, while remaining stable for both the unique subarray ...
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3answers
451 views

Optimal “if-else” tree algorithm to minimize duplicate code

I'm having trouble formulating this problem as an algorithm: I have a set of conditionals (combined with &&) and operations, for example: if (A && B) execute C else if (D ...
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1answer
604 views

Using std::sort et al. with user-defined comparison routine

In the evaluator of a custom language, I would like to replace our own sort routines with std::sort or other routines, possibly tbb::parallel_sort. The problem is that we allow users of the language ...
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1answer
212 views

Implementation of chess endgame engine without Endgame Tablebases

I'm interested in creating an chess endgame solving engine. The endgames in chess are usually solved using the endgame table-bases generated by retrograde algorithm. I have found that Artificial ...
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43 views

Designing online exam [duplicate]

I need to design an online exam server for an exam like GRE in which question difficulty increases if you answer correctly and decreases if you answer wrong. Questions are multiple choice ...
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1answer
230 views

Designing online exam

I need to design an online exam server for an exam like GRE in which question difficulty increases if you answer correctly and decreases if you answer wrong. Questions are multiple choice ...
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4answers
362 views

Implementation of algorithm to generate chess positions

I am interested in developing a program that generates an endgame table-base for the chess. I have gone through the technical papers of the greats like Shannon and Ken Thompson. I have found that ...
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229 views

Minimax in a bayesian game with multiple players who do not play in order

Premise: I know that such a game would be better solved by MCTS, however, from a theoretical point of view, would it be possible to apply minimax to a bayesian multiplayer game where the order of ...
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1answer
90 views

What HTTP status codes need to be checked for this network task to perform smoothly?

My office department logs in to the ISP Server through a keep-alive-browser login page. This, for better performance, is encapsulated in to a small python script. This is what it does (Pseudo code) ...
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1answer
92 views

Algorithm that determines relevant attributes in ordered list

Suppose I have a list of objects sorted by a person based on that person's subjective taste. Let's assume that this person is being somewhat consistent in their sorting and that there are quantifiable ...
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2answers
379 views

Algorithm to find times when resources are available

I'm writing a semi-automatic scheduling application. Given some existing bookings and some resource requirements, it needs to find the times at which a new event can be scheduled. A human user will ...
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1answer
108 views

How to know, with good performance, which areas a certain point is in? [duplicate]

I'm interested in build a prototype that needs this sort of thing: Point A (xa, ya) with a radius of 500 meters. Point B (xb, yb) with a radius of 700 meters. Point C (xc, yc) with a radius of 1200 ...
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2answers
213 views

What kind of transform is this?

I have a function that linearly "remaps" a value from a given interval to an other interval? The function remaps a value from a given interval [oldMin, oldMax] to another interval [newMin, newMax] ...
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817 views

Algorithm for fast tag search

The problem is the following. There's a set of simple entities E, each one having a set of tags T attached. Each entity might have an arbitrary number of tags. Total number of entities is near 100 ...
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2answers
261 views

Graph traversal and filtering in indoor navigation and path finding

Which of the following options take less processing time/is less expensive in a graph traversal algorithm for a (indoor)navigation system? a) To produce all possible paths between start and ...
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144 views

fill containers with blocks of different sizes to have containers of “similar” sizes [closed]

I have a sorted list of blocks L that I want to put in 4 containers C, the containers have a size limit S. I want to have similar containers height, by similar I mean the size variance should be as ...
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1answer
1k views

Guidance on Excel VBA resource scheduling algorithm?

This was posted originally at StackOverflow though suggested to post here instead. I am looking to create an Excel VBA solution that will create a rota/schedule allocating staff to service users ...
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4answers
373 views

Is there any sorting algorithm which is not inherently sequential and is task distributable?

After googling for a couple hours, I came to a conclusion that all sorting algorithms are inherently sequential which can be data distributed but not task distributable. Is there any algorithm which ...
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329 views

Unit (regression) testing scientific algorithms given floating point behavior

I have been working on a project and running into a very difficult problem. The problem can be stated simply as how to unit-test numerical algorithms. However if you just took this simple statement ...
2
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1answer
157 views

Cohen–Sutherland algorithm

I was reading Cohen–Sutherland algorithm on Wikipedia and I am confused in these two parts, int ComputeOutCode(double x, double y) { ... if (x < xmin) code |= LEFT; else if (x ...
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3answers
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Why Big Data Needs To Be Functional?

I started working on a new project lately related to Big Data for my internship. My managers recommended to start learning functional programming (They highly recommended Scala). I had a humbled ...
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finding patterns into logs

I am trying to put together a way to figure out if incidents occurred based on log content. Typically, on log (or db table) would contain a list of transactions composed as follow: {Timestamp} ...
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398 views

How are algorithms developed? [closed]

I'm impressed with the efficiency of some algorithms and I noticed the way the problem is solved can be and/or appear really unintuitive. It may sound dumb, but I would like to know: How do the ...
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3answers
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Sorting an array of numbers with decimal places

Suppose I have an array of float values in the following format: { 1.34, 1.15, 1.1, 1.2, 1.26, 1.10, 1.20, 1.17 } Suppose they have been provided by user input (or some other mechanism), where the ...
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How to algorithmically add notes to an existing midi file relative to positions of existing notes in python

I have a midi file that I'd like to algorithmically add notes to relative to other notes that already exist in the midi file using python, or if it's easier using a different language I'm open to that ...
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530 views

When interviewing programmers, are algorithm problem solving skills relevant for a job were solving such algoritm problems isn't normally needed? [closed]

Software created for some business domains don't require heavy use of algorithm problem solving skills on the job from the programmers working there. For example, a JEE developer might most of the ...
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794 views

Algorithm for recursive evaluation of postfix expressions

I'm reading Sedgewick's book on algorithms in C and I'm looking for an algorithm to evaluate postfix expressions (addition and multiplication only) without using a stack. I tried to implement one but ...
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1answer
133 views

Search Substring in String collection

I have a big collection of strings a[1], …, a[N] where N is about several millions. I am provided a string m and I need to iterate over all the strings a[i] that contain m. In other words, I need to ...
3
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1answer
2k views

Database design/relationship for threading messages

What's the database design or business logic for creating an app for messaging between users? I am having difficulties with choosing how to approach the relationship between each Conversation of User ...
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1answer
114 views

Better way to create samples

I've done this piece of code for creating bernulli samples, but I think that it is a so heavy algorithm because every time I call this recursive function I create a new vector that is passed to it. Is ...
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4answers
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How do you identify a problem as being suitable for dynamic programming?

I have been reading up on dynamic programming lately. Would like to hear from someone who started from scratch and now is pretty good at identifying and solving DP problems. I am struggling in ...
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0answers
187 views

Help/suggestions for Parallel assembly line scheduling (Dynamic programming)

I am working on a problem similar to the assembly line scheduling by dynamic programming.The issue is that unlike the classic problem where we have predefined stations now I only have information ...
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3answers
897 views

Evaluate all pair combinations in an array for a condition in n log n time complexity

Task - Consider an array of n elements. Count the number of pairs that satisfy condition X (sum of the two elements < an arbitrary number, k) . The basic approach I could think of would be O(n^2), ...
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67 views

Optimal group room division algorithm with weights

I hope someone can help me with this, as I'm thoroughly stuck. I'm working with a group at my university, on a first semester research report that should end up as a finished program, solving the ...
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2answers
267 views

An algorithm for a synchronization

I want to make a synchronization. What's the algorithm for it in a nutshell? 1) A client reads a local data and sends them to a server afterwards. The server compares them with its actual data, ...
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3answers
210 views

Algorithm to calculate estimated future usage of a defined value

I am looking for the name of a computer algorithm. I'm fairly sure that one should exist which will help me, but I can't for the life of me figure out what to search for. If you have implementations ...
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140 views

How to calculate the worst-case runtime of this search-algorithm

I've written a special indexOf function for a list of unsorted unique values. I can search for one or multiple (unsorted) values, passed as array/list, and the function will return me an array/list ...