# Questions tagged [problem-solving]

Problem solving encompasses a number of techniques known as algorithms, heuristics, root cause analysis, etc.

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### How to manage cart details across various devices

Recently I was asked in a interview to implement to e-commerce site . One of the requirement was to maintain cart details across various devices .(i.e) if user adds a book from his iPhone , and when ...
115 views

### Conceptual approach to identifying duplicates

I'm not sure if this is the right stack exchange site for this, or maybe this is more of a reddit question, but don't rake me over the coals for asking. Happy to go post on another corner of the ...
2k views

### Algorithm for floor tiling

I'm looking for an algorithm for placing tiles of different sizes within a complex area (all 2D) as randomly but efficiently as possible. I know the different dimensions of the tiles provided and the ...
128 views

### How to measure how "changy" something is? [closed]

I need to think of a way to model how one thing is more "changy" than another. Say I need to index a news website's different news sections with some web crawler. I want to prioritise ...
2k views

### Abstraction: The War between solving the problem and a general solution [closed]

As a programmer, I find myself in the dilemma where I want make my program as abstract and as general as possible. Doing so usually would allow me to reuse my code and have a more general solution ...
545 views

### The problem of letting the receiver instead of the sender generate an ID

Lately I've encountered a similar problem in a few different circumstances, and every time it has required quite a bit of extra code to work around it. The problem I'm talking about is the one where ...
1 vote
188 views

### Rectangle packing / Bin packing with multiple frames

I have multiple rectangular frames, with different fixed heights. The width should be minimized and there is a maximum width. Then there are many different smaller rectangles. These should be packed ...
1 vote
370 views

### Help to simplify/model complex decision making (if, then, else scenarios)

I find my self in a situation, where I need to program a service, that can determine if two object in a huge database are the same. For simplicity, let's say it's used cars, and I want to determine if ...
2k views

### Where do you draw the line for your perfectionism? [closed]

Perfectionism may be good and bad when programming. When and where do you draw the line when you are problem solving? When do you decide when a solution is overkill, too general or simply too ...
1 vote
217 views

### Which class of problems is this?

I’m working on a problem which I will try my best to describe: You have a stack of 5 blocks: labelled A, B, C, D and E. You also have a set of rules giving points if certain conditions are met, for ...
613 views

### Smallest Rubik's cube state representation

I'm trying to determine what is the fewest number of bits I need to represent the state of a Rubik's cube. (EDIT: I am assuming the cube is a valid Rubik's cube that has not been altered and only ...
133 views

### How to identify rules satisfying a certain condition based on events

I am working on a microservice, in an event driven world, where I have tens of 1000s of rules configured which depend on data type A, B, C, D and so on. As soon as an event arrives I want to be able ...
2k views

### How to detect root cause of problem or bug [closed]

Often in coding, I find it very slow and difficult to detect the root cause of a bug and sometimes I end up going to wrong point in my code. It's painful. I know that to detect the root cause of a bug ...
2k views

### What is a good way to brainstorm algorithms on a computer? [closed]

I'm looking for something that allows me to work out an algorithm on a computer similar to how I would do it on a whiteboard. At work, I have a huge whiteboard that I can use for this, but at home, I ...
166 views

### How to resolve multiple user serve on multiple location appointment booking system

I'm trying to build an appointment system but at one point I stuck Problem: I define available slots for the next 7 days with help of a cron. I have multiple users serve service more than one ...
2k views

### Optimistic & Pessimistic Programming - Ensuring multiple tasks are called only once for specific record

Let's say you have 10 database records which you need to process in the following way: Start Pull 2 records from the database with the 'Processed' flag set to 'false' Call the external web service ...
208 views

### a valid ranking algorithm for facebook posts

I'm creating a website which will collect posts from facebook's pages to show to the users posts they are interested in (as my graduating project). I'd like to be able to rank the posts that contain ...
1 vote
175 views

### Determining resource exhaustion beforehand

I guess this is a problem solving question but I am out of ideas, don't really know where else I can resort for help, and I need to solve this problem. Essentially we have a set of consumers and a ...
3k views

### How to save during real-time collaboration

I want multiple users to edit same document. Problem I'm facing is when a new user joins, he might see an outdated document. How do I make sure that new users get most recent changes? Some solutions ...
999 views

### How to reverse engineer URL routes from a bulk of HTTP requests/responses

I am building a web application crawler that crawls for HTTP requests (GET, PUT, POST, ...). It is designed for one specific purpose; bug bounty hunting. It enables pentesters to insert exploit ...
301 views

### Trying to teach a high school student Dynamic Memory Allocation - what are the best ways to do so?

Copied from stack overflow due to feedback So I want to teach someone how to do dynamic memory allocation using the block padding model. What that means is every memory block is prefixed and ...
4k views

### Algorithm for calculating a bullet path to a target with max. 2 ricochets

Sorry for the poor title but I didn't have a better way to phrase it... So there's this amazing game by Nintendo (yes!) on Wii called WiiPlay. There're 9 minigames in it, and my favorite one is ...
268 views

### Practices for navigating uncertainty in software design

Background: So I'm trying to create my first game engine for learning purposes. After looking up a few articles I was able to design the beginning portions of my engine to at least get me going. My ...
4k views

### Understanding of the Carry Flag Bit

Intel 8085: In my textbook it is said: "Carry Flag - this flag is the carry out from the MSB of the A-register. CY is set after an ADD instruction if carry out was generated from the A-register." I ...
4k views

### Difficulties with Two's complement in Assembly

Everything discussed here will refer to Intel 8085 (8-bit architecture). When using two's complement number "conversion" : 1.) If we take SBI 0F (subtraction) for example; immediate value 0F(hex) or ...
3k views

### Flowchart for solving programming problems [closed]

I noticed that every developer implements a somewhat different flowchart for solving programming problems. By flowchart I mean a defined system of techniques that the developer goes through in a ...
399 views

### What is this Algorithm called? [Traveling Salesman Problem]

I've been thinking about the Traveling Salesman Problem. In examining it and grids of cities, I noticed that I could frequently pick out the shortest route just by staring at it. Granted, I couldn't ...
1 vote
2k views

### Having trouble with AP computer science sample test problem

I am currently taking AP Computer Science at my high school and while looking at some sample AP test problems I came across one that really confused me. Sample Problem The answer to the problem is ...
11k views

### What programming language generates fewest hard-to-find bugs? [closed]

What language, in your opinion, allows the average programmer to output features with the least amount of hard-to-find bugs? This is of course, a very broad question, and I'm interested in very broad ...
615 views

### How to avoid errors and not miss anything [duplicate]

I have a problem that is more serious than it might seem. I've been programming for about three years , and I have learned and improved a lot , I read the code easily to others, understand the ...
3k views

### How to avoid jumping to a solution when under pressure? [closed]

When under a particularly strict programming deadline (like an hour), if I panic at all, my tendency is to jump into coding without a real plan and hope I figure it out as I go along. Given enough ...
200 views

### How do you deal when an error occurs on 1 instance of your website/program/app?

I've had a couple of times in the time I've working, moments when I get an error ocurring in just 1 computer and it often takes me hours or days to figure out because it is (or at least seems) an ...
227 views

### Recognize bug or inability to solve a problem by yourself

How to recognize when there is a bug in program or you have an inability to solve concrete problem? I noticed when I concentrate too much time on a problem and can't find a solution, I am starting to ...
2k views

### What programming problems do Monads solve? [closed]

I've read a lot of posts that explain what monads are, how unit and bind work, some of them plunging straight into category theory so abstract (for me at least) that makes the eyes bleed, some ...
13k views

### Dealing with frustration when things don't work [closed]

You ever try to implement something simple but for some strange reason it doesn't work. So you try a possible solution but then something else doesn't work. You keep trying different workarounds but ...
1 vote
414 views

### How do I have a group of numbers which total does not exceed a limit, and each number must be >= 0?

Suppose I have an array of n numbers. The rules for the array is as below: All the numbers must add up to 1000 If a number changes (positive or negative), all the other numbers in the array must be ...
5k views

### Is thinking out loud during an interview really the best strategy? [closed]

In another question I asked recently about best practices for whiteboarding, there was general consensus that thinking out loud while coming up with the answer was the best strategy. Indeed, long ...
10k views

### Is "White-Board-Coding" inappropriate during interviews? [closed]

This is a somewhat subjective quesiton but I'd love to hear feedback/opinions from either interviewers/interviewees on the topic. We split our technical interview into 4 parts. Write Code, Read & ...
1 vote
439 views

### Questions about the issue of getting stuck in a problem, and making snail's pace progress [closed]

Let me describe my background. I am currently a software developer co-op working at an architecture firm that has a large focus on research and development, mainly in mathematical modeling and ...
507 views

### Does anybody recognize this scheduling problem? Is there an algorithm for it?

Consider the following problem: Description: There are n jobs J1...Jn with cycle times C1....Cn. Find a time quantum and a scheduling table considering that: any element of the table contains at ...
750 views

Is it possible to calculate shadow areas of buildings or simulate shadows of buildings in a city, using the heights of these buildings and the sun angle and azimuth? The basic light tracing concept ...
531 views

### Pairing 40 people over 20 days such that no pair is the same twice or more [duplicate]

I'm trying to figure out what algorithm / method I can use to figure out how to pair people together such that the pairs aren't repeated i.e. if a unique individual is denoted by Px where x is their "...
1 vote
809 views

### Increment or double problem

I have a problem with an assignment. In this assignment I have to create a program which needs to calculate how many different possibilities are there to get from number a to b. To get from a to b you ...
608 views

### scrabble solving with maximum score

I was asked a question You are given a list of characters, a score associated with each character and a dictionary of valid words ( say normal English dictionary ). you have to form a word out ...
175 views

### Estimed number of tries

Problem: The Oscar Committee wants to decide which person should get the best actor award among the given N actors.For that they decided to use a random function random_bit() which returns either 0 ...
1 vote
1k views

### Turn over cards in minimum number of steps

Imagine you're given an array of cards. Some of them are facing down (0), while some of them are facing up (1). Is it possible for given fixed K to turn all the cards face-up by turning over any K ...
1 vote
336 views

### Karger's algorithm for bin-packing?

I first came across that algorithm as the "Random minimum cut" algorithm. And recently a colleague was trying to pack a big quantity of small textures into one image file. Then it clicked - why not ...
803 views

### Genetic Algorithm's Tournament Selection limit to be selected

I started working again on a Genetic Algorithm and i'm trying a lot of operators and ways of selection. When I made the Tournament Selection , I noticed that it gets really easy to always get the top ...