Questions tagged [computer-puzzle]

A tag for puzzles dependent upon some degree of computer literacy - for instance, requiring basic familiarity with operating system usage, encryption or programming.

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18
votes
2answers
686 views

Away from the hub

Today I got a weird FaceTime call from teenage girl I didn't know. They must have dialled the wrong number, but I was too intrigued to hang up. Instead, I covered my camera and turned off the ...
18
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2answers
3k views

What does this Java code represent?

The following is a text rebus in the form of a Java program: ...
18
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3answers
2k views

Puzzling 101: Sums of seventeen numbers

After reading a bit in Meta and the help section, I'm still not sure whether this qualifies as a "good" puzzle in the spirit of the site, but the votes will show - I liked it when I encountered it, ...
17
votes
1answer
2k views

Nutter, Nutter, Peanut Butter

What's this then? ...
17
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2answers
2k views

Who can spot the difference?

My family and I have just moved house! Lucky us! So what did my family do? We held a housewarming party, and rung everyone in the neighbourhood up to invite them. So, anyway, people were coming in ...
17
votes
2answers
503 views

Maximum Height of a Hotel with Strange Elevators

I encountered this puzzle many years ago, and I think back on it often as it is unique and thought provoking. As far as I know nobody has proved the given solution as optimum, so it may still be ...
16
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3answers
1k views

A riddle to make a channel queasy

An accidental discovery of mine, this groan-worthy riddle is answerable with a single character when posted in a Slack channel: What governs the level of disease? As this is my first riddle here I'...
16
votes
6answers
534 views

A regular riddle

I'm kept inside a boxy cage.A prefix for the modern age, I make the messages you create fly at a supersonic rate. Now that box has me and my friends inside a box with rounded ends. You can ...
16
votes
3answers
2k views

Clue 18 - Should this be on Stack Overflow?

<<---First clue <---Previous clue As you sit at the computer that you used to solve the last puzzle, a popup window opens. It appears to be a Stack Overflow question, with a very generic ...
16
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2answers
1k views

Strategies for creating a cross sums puzzle with a unique solution

I am looking for strategies for creating a puzzle with a unique solution, and ways of testing for uniqueness. Specifically, I'm trying to create cross sums puzzles. How can you create one with a ...
16
votes
1answer
501 views

Old code for the new year

Here is a question I posted on rec.puzzles back in 1998. So it's about twenty years on, and people seem to have stopped thinking about it. I'll refresh your memory by posting it again: I wrote a ...
15
votes
8answers
1k views

High and low rebus

What may the following represent? $\large\underline{US}$ $\large01100111$ $\large00\Large\color{green}\bullet$ The 3 rebuses give 3 proper nouns. They are in alphabetical and ...
15
votes
3answers
2k views

Trying to understand an unusual timestamp encountered on the web

I am writing an API to crawl a popular website, eksisozluk, kind of like Turkey's reddit, but more text based. On this website, you can get a list of the popular posts from the path /basliklar/...
15
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3answers
1k views

For which numbers does the order of reversing their digits and squaring not matter?

This was a question made up by a friend who doesn't have SE. Let the function $r:\mathbb Z^+ \rightarrow \mathbb Z^+$ reverse the digits of a number (in base 10) that it is applied to. In addition, ...
15
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2answers
2k views

Quick Puzzle: What is it?

What is it? Is it zebra? 0 0 1 0 1 1 0 1 1 1 1 0 0 0 1 0 0 1 1 1 0 1 0 1 0 0 1 1 0 1 1 1 1 0 1 1 0 1 1 1 1 0 0 1 0 1 0 0 1 1 0 1 1 1 1 0 1 1 1 1 0 1 1 0 0 1 0 1 0 0 1 1 0 1 1 1 1 0 1 0 0 1 1 0 1 1 1 ...
15
votes
1answer
959 views

Decipher the clues, escape the prison!

Decipher the clues, escape the prison! The guard at the prison, where you have been locked up for misuse of USB ports, has given you one chance to escape, by typing in a certain word. A keyboard is ...
14
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3answers
784 views

Is there room on the code “rebus” bandwagon for one more?

...
14
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5answers
522 views

To each his own

You are a graduate student in theoretical mathematics, dabbling every so often in some interesting but equally useless computer science theory. From the beginning of the year, Professor Carl Hayden ...
14
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2answers
507 views

Tiling rectangles with W pentomino plus rectangles

Inspired by Polyomino Z pentomino and rectangle packing into rectangle Also in this series: Tiling rectangles with F pentomino plus rectangles Tiling rectangles with N pentomino plus rectangles ...
14
votes
4answers
986 views

Don't Be Afraid Of The Dark

This puzzle follows the convention that anything outside a quote is flavour text. So last night I left my computer running. You know - when computers get older they want to bend the rules a bit. Don'...
13
votes
3answers
2k views

Restoring order in a deck of playing cards (I)

Michelle has a deck of 52 playing cards, stacked in a pile with their backs facing up. She takes the first 2 cards in the pile, turns them over, and places them at the bottom of the pile. She now ...
13
votes
2answers
1k views

Cryptic message from a former SYSOP

Your sysop recently quit due to what the law division calls "internal struggles". Less fancily, he hated you, and he hated his job. As a parting gift, he left you a program entitled SwanSong.c. Being ...
13
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4answers
3k views

A dice game, what is the optimal strategy?

Alice was walking on the street when she came across a man playing with a die. She could not help trying to check if the die was loaded and while she was concluding that it wasn't loaded, the man ...
13
votes
4answers
2k views

What is the password in the image?

For my first puzzle I made this, everything you need is in the image. The goal is the find the hidden password. You must look at the image to solve this puzzle, but here's a transcript of the letters ...
13
votes
3answers
736 views

The Hyper-Modern Kidnapper: Crime Scene #5 (The last crime scene)

The Story: It had taken longer than planned to sneak out after having solved the word search with the hidden message. Vimes was worried that he had alrady failed. Having taken the stairs to reduce the ...
13
votes
1answer
1k views

A Quote from what Movie?

Heads up: It's possible to solve this puzzle without writing computer code, but it is intended to be solved with computer help. This is a 2-stage puzzle. Stage 1: Calculation Puzzle Rules: 1. You ...
13
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1answer
1k views

Another Linux movie command

Inspired by this question, here's another Linux command representing a famous line: cp -a ~she ~ Which line is it?
13
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2answers
1k views

Which country am I thinking of?

Fill in the gaps with the answers of the rebuses, and then answer the question: Which country am I thinking of? It's → 2 ↓↲ And they will be the ...
13
votes
1answer
659 views

Protip: Don't leave your computer unlocked during a guess-the-song challenge

Me and my buddy, Jim, were playing a guess-the-song challenge. Of course, I was winning. (Don't tell him I said that!) After he left, I looked at my computer, and saw this written in gedit: ...
13
votes
2answers
591 views

Help me find my friend!

I need your help! My friend has gone missing and I have no clue where he could be! However, he did manage to get a message out to me: Kidnapped. Send help. I am here: port town. $\left\lfloor\...
12
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8answers
5k views

A Simple Programming Task

You are given a task to write a program to switch values between variables, but you are not allowed to use any extra variable or any function to exchange values between the other variables as shown ...
12
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5answers
546 views

Labelling a Snow Flake Graph to Attain Minimum Sum

Label the vertices (or nodes) of this graph with positive integers so that any two nodes are joined by a edge (or line) if and only if the corresponding integers have a common divisor greater than 1 (...
12
votes
4answers
1k views

The Recursive Song

This is a revival attempt of the Fortnightly Topic Challenge. Easter is coming, time to hide some Easter eggs. As you probably know programmers hide them in program code. This type of Easter eggs ...
12
votes
2answers
1k views

Tricky wild goose-chase puzzle

Your obnoxious little brother loves to outwit you. He asks you to find the message hidden in the following image You are determined and ready to teach your brother a lesson. But can you ?
12
votes
3answers
2k views

Programming News Paper Puzzle

This puzzle appeared in my local paper, while I am unable to solve it - maybe you guys can take a crack at it. Page 1 Page 2 They were scanned at pretty high resolution, so you should be able to ...
12
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2answers
1k views

Yet another movie line on the Linux terminal

What famous quote does the following terminal session refer to? $ ps -o ppid= -p $u 28342 $ echo $$ 28342
12
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2answers
260 views

Unlucky tiling: Arrange thirteen right isosceles triangles into a square

Link to next puzzle in this series:Five graded difficulty isosceles right triangle into square tilings Two difficult "Seventeen right isosceles triangles into a square" tilings V.hard ...
12
votes
2answers
419 views

Comparatortionist: The $M_Q$ Functor

The Problem At the intersection of mathematics, computer science, and insanity, we find the $M_Q$ functor${}^1$. $${M_Q} = {\Phi _{{s_1},{s_2}}}\left\{ {\begin{array}{*{20}{l}} {E \leftarrow {\Phi ...
12
votes
1answer
401 views

Computational Linguists

An entry in Fortnightly Topic Challenge #35: Restricted Title 1.Computational Linguists In order to help me boost my paltry grades, the professor of my computer class has given me an extra credit ...
11
votes
2answers
875 views

How many bits in the Apple Logo? [closed]

Sorry in advance if this is a bit easy or if it breaks any rules, but it's the best I can think of. The Question: If there are 16 bits in a picture of an apple, how many bits in the Apple Logo?
11
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3answers
5k views

My co-workers left me a message

While refactoring a massive chunk of old code, I found a rather curious section of code commented out that wasn't there the day before. Can you tell me what it means? ...
11
votes
2answers
904 views

Can you figure out my favorite color?

I will start this puzzle with a review of my all time favorite book. This book is about architecture and city planning by authors who worked at a university. Here in the book, there are over 200 ...
11
votes
2answers
772 views

Determining Call Chain

There were 25 kids in a class and each kid had some best friends. To simplify the problem, let's call each kid by their initial name. Here is a list of each kid's best friends: ...
11
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3answers
2k views

A Programmers Riddle

A programmer friend left me a riddle: ...
11
votes
1answer
409 views

Whatever it is, it should be in a museum

I have a friend who collects early computer technology. In fact, he's got a bunch of bizarre peripherals that probably should be in a museum instead. Some of this stuff is so esoteric that he's had to ...
11
votes
1answer
582 views

What is a One-In-A-Million Number™?

This is in the spirit of the What is a Word™/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles. If a number conforms to a special rule, I call it a One-In-A-Million ...
11
votes
6answers
743 views

The Worst Part about Coding

Torture I do you I am better than brainf*** I love String Theory What am I? Hint:
11
votes
1answer
361 views

Countries of World - Three Blocs

Two junior colleagues of mine came to me today morning. Both of them wearing a broad smile. I asked what the matter, what mischief are you guys planning. One of them just typed a URL on my computer. ...
11
votes
1answer
223 views

Ode to Regular Expressions

Robert loves regular expressions and ever since his friend Jean introduced him to Regex Golf, he spends most of his time trying to find the shortest and most elegant solution possible. Robert is also ...
10
votes
2answers
3k views

decipher RGXWSTLSQLITL where (ABCDEF=QWERTY)

decipher RGXWSTLSQLITL where (ABCDEF=QWERTY) How do you solve this?