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147 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 ...
201 views

Solving a Sudoku variant with an unknown element

I recently stumbled upon a special Sudoku variant and am now struggling to effectively solve it programatically. Consider the following initial 6x6 grid: The rules The red question mark is ...
143 views

I was asked the following question as part of an interview: Integer V lies strictly between integers U and W if U < V < W or if U > V > W. A non-empty zero-indexed array A consisting of ...
12k views

I am not a good programmer (in logic), how should I fix it?

Ok, so here is my problem: I work for a big company, some how landed a job (frankly because the interview was easy). It's not that I don't know my stuff, I am pretty good at understanding java, it's ...
73k views

Where can I find programming puzzles and challenges? [closed]

I'm trying to find places where I can hone my craft outside the context of school or work. Are there places online, or books available, where I can access lists of programming puzzles or challenges?
10k views

Get 100 highest numbers from an infinite list

One of my friend was asked this interview question - "There is a constant flow of numbers coming in from some infinite list of numbers out of which you need to maintain a datastructure as to ...
235 views

What is a O(n) algorithm to solve this puzzle?

We are going to hold a meeting where everybody will speak in clockwise direction around a table. There are n people with n spots. Each person has a position preference (e.g. some want to go first, ...
2k views

N queens, X by Y board decision problem interview question

I was asked the following question in an interview today and I've been thinking about it ever since. I was not able to answer it and haven't been able to find a solution online. Given a chess board ...
41k views

Tricky logic puzzles - Are they really useful in assessing programming skills?

In the last interview I attended, I was asked to solve a puzzle where I was expected to measure exactly blah liters of water given two buckets with capacities - blah and blah liters respectively. I ...
5k views

Programming interview question on Trees

I was asked this interview question at a top internet website company recently. Certain empty glasses of water are arranged in the following order When you pour liquid into the 1st glass if ...
1k views

sets of numbers that sum to a certain number?

I was asked this in an interview, and I'm not sure what the answer is or how to approach the problem. Find a pair of numbers that sum up to zero (or any other number), then find three (and then ...
1k views

What are the chances of getting a good development job without the training in solving programming puzzles? [closed]

By "good job" I mean mostly a job that is well paid and involves the development of market-leading products/services (of course within my area of interest). I have a masters degree in economics and no ...
2k views

Does studying logic puzzles help to pass interviews or limit you? [closed]

It is still under questionâ€”a Programmers.SE questionâ€”if competence in solving logic puzzles is a good assessment of programming skills. Nevertheless, they're still used, and chances are high that you ...
646 views

Puzzle solving: Minimum number of steps to achieve a goal

I have been doing some programming contest problems, and I have noticed that many of them involve something along the lines of "get the minimum number of steps necessary to achieve a certain goal". ...
169 views

How does one generate challenging different puzzles like the one in AirLock android game [closed]

here's the link of the app: https://play.google.com/store/apps/details?id=com.iatll.airlock I had studied AI in the final year of b.tech cs programme, and i do remember some algorithm of ...
302 views

C quiz, puzzles obfuscated C [closed]

I believe that I am a good C programmer. I can solve beginner level Question in google's code jam. I did solve all of the programming examples in KN kings: C programming. Given a problem I can express ...
3k views

Should you solve programming puzzles as a routine? [closed]

At the moment, the only times I try solving programming puzzles are: When I'm bored When I happened to find an interesting puzzle, while not actually searching for such (e.g. someone asked about ...
2k views

Monkey Hunter algorithm - Interview question [closed]

Question asked in an Interview: You are a hunter in the forest. A monkey is in the trees, but you don't know where and you can't see it. You can shoot at the trees, you have unlimited ammunition. ...
588 views

Reading graph inputs for a programming puzzle and then solving it

I just took a programming competition question and I absolutely bombed it. I had trouble right at the beginning itself from reading the input set. The question was basically a variant of this puzzle ...
2k views

Books having graded collection of programming problems

I am looking for a book with graded (i.e from low to high level of difficulty) collection of programming problems. The problems I am interested in are Algorithm/Data Structure problems, since this is ...
810 views

Backtracking with Killer Sudoku

I'm developing a Killer Sudoku solver for a school project. I've programmed 10 human strategies showing what they are doing in order to be the most educational possible. It can solve hard Killer ...