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
5answers
1k views

‘‘Loopy’’ C loop

What is the smallest number of non-space characters that can be added in order to change the following code into a complete C program that prints  ...
33
votes
14answers
6k views

Debugging with printf()

Bob, a C programmer and a believer of printf-debugging, gets hired by a failing software company. The company is not doing well because they adopt an archaic source code management system which does ...
21
votes
2answers
3k views

What is this mysterious image?

Recently, my friend who lives in Italy sent me an email. This was its contents: Hi, I've got some news which you should be happy about. But I've seen you around on Puzzling.SE, so I though I'd ...
6
votes
2answers
458 views

How do you escape the prison?

You are a wrongly-accused prisoner in a high-security prison, where you have been sentenced for life. However, one of the guards believes your story, and has given you a single chance to escape. He ...
2
votes
10answers
465 views

What am I? Animal edition

I reveal hidden secrets, where nanoscale put me there. I exist in a honker -- Maybe a carapace too. What am I? Hint: Hint 2: Hint 3:
3
votes
5answers
462 views

A really harsh short puzzle

I may be burned at the stake for this one so "sorry" in advance! When does pot and top make it without a why? (You may need a particular object to figure this one out...) Hint Hint #2:
7
votes
5answers
865 views

Who killed the president?

(Semi-interactive puzzle) Puzzle 1 You slowly roll out of bed, preparing for the day of solving crime ahead of you. After all, you are the greatest detective the world has ever seen. But at work, ...
4
votes
1answer
174 views

What does this represent?

#actions /* 0,1,0,0 */ .words /* 0,0,1,0 */ Hints: Hint 1: Hint 2: Hint 3: Hint 4: Hint 5: Hint 6: Hint 7: Hint 8:
31
votes
2answers
2k views

The Time Machine works but my friend is gone!

So my friend Fred and I have been developing a time machine. I know it sounds impossible but we think we've hit a breakthrough! Fred has had a successful test run but he didn't tell me where he was ...
39
votes
4answers
9k views

Who stole the bitcoins?

Introduction You want to give bitcoins to a person you have met. Part of the deal is to give the bitcoins in the most untraceable way. So you have decided to send an email to him with the address (...
13
votes
1answer
662 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: ...
7
votes
1answer
266 views

My New Computer is Malfunctioning

This is weird! I recently bought a brand new (but very cheap) computer, and there's something wrong with it. I downloaded some MP3s onto it, and now every time I open my music program and try to ...
10
votes
2answers
342 views

Only Losers Read the News

Only Losers Read the News Note the enigmatic tag. It's not meant to be clear what you're seeking.
14
votes
3answers
784 views

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

...
10
votes
2answers
2k views

What movie quote does this represent?

This describes the quote: ...
17
votes
1answer
2k views

Nutter, Nutter, Peanut Butter

What's this then? ...
177
votes
1answer
25k views

Lock your computer when you walk away!

Well this is strange. I forgot to lock my monitor when I walked away from my desk, at work, and one of my co-workers decided to have a little fun. When I got back, I found this little C# console ...
21
votes
10answers
6k views

Another idiom for computer programmers

One of my (many) mottos: ...
19
votes
1answer
2k views

The great puzzle

Someone one was trying to find out something, according to the following UNIX commands. ...
6
votes
3answers
624 views

What question is my computer asking me?

I need your help. I think my computer is gaining sentience. I went to a play, but when I got back this file was saved on my desktop: ...
28
votes
2answers
2k views

Little bits of food

You will come across a question. Answer it.
7
votes
1answer
449 views

Reproduce output in picture using a logical input list by introducing a bug

I came across this picture and thought that this would be a fun programming puzzle to work out. (https://www.reddit.com/r/funny/comments/4hjf4y/ill_take_february_tickets_please) (Clearly, the ...
9
votes
6answers
2k views

A mosquito is born at T=0 and after 2 seconds makes a new mosquito every second, how many mosquitos at T=8.5? [closed]

One mosquito is born at T=0 and after 2 seconds it makes a new mosquito, and another every second thereafter. All such mosquitoes have this same property and do not die. How many mosquitoes there are ...
65
votes
6answers
5k views

Bar-coded Message (Reverse Engineering)

This weekend, while totally minding my own business and in no way being suspicious, I just happened to come across the following interesting document: Left page: download as TIFF (100,203,616 bytes) /...
57
votes
5answers
7k views

Game of Life: Move the Sun

Based on Game of Life: Kill the Sun Conditions are the same: Below is an initial state for Conway's Game of Life with a single pulsar. Living cells are white. The area marked with red is your base. ...
176
votes
10answers
19k views

Game of Life: Kill the Sun

Below is an initial state for Conway's Game of Life with a single pulsar. Living cells are white. The area marked with red is your base. You are free to modify any of the red cells, but only those, ...
6
votes
1answer
1k views

A penguin encoded message

There once was an elf who wanted to send a message to Santa. This elf was a penguin rider and had a large amount of penguins so he laid them in a row with some on their bellies and some on their backs....
6
votes
1answer
991 views

Retrieve a phrase by assembling the string puzzle

You’ve never seen such a verdant shade of green as the leafy tops of the trees that now form a focal point up ahead, peaking over the high and solid concrete walls which surround Eden. The colour ...
2
votes
1answer
656 views

Am I in or Am I out?

There is a very simple logic-based programming language called M35. Here is how simple it is. It has $3$ (yes three) instructions: Load acc with $1$ Add $3$ to acc Multiply acc by $5$ Bob wants to ...
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:
89
votes
6answers
9k views

Fwd: Re: Karen is missing!

From: Ada Hughes <ahughes@fib.gov> Sent: Thursday, April 7, 2016 7:03 PM To: Joe Dorsen <jdorsen@fib.gov> CC: Jason Bernz <jbernz@fib.gov>; IT Guys <cis@fib.gov> Subject: Re: ...
19
votes
1answer
818 views

Oh no! A hacker has taken control of my computer!

It seems that some guy called Magick has taken over my computer. Well, there does not seem to be any harmful stuff done at least, but this picture keeps appearing on my screen. "HACKED by Magick"? ...
7
votes
1answer
307 views

Binary on a diet

How can you make binary data less filling? Remove the 1s, of course. OO O OO O OO OOOO OO OO O O OOO O OOOOO OOO O O OOO OO OO OO O OOO OO OOO OOOO ...
1
vote
1answer
299 views

Hexadecimal puzzle

Can anyone figure this puzzle out? Puzzle: Shift by 0x83F Hint 1: Hint 2: I was given the puzzle and hints and I know the output is supposed to be a password.
13
votes
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 ...
41
votes
3answers
1k views

The telltale code

The other night, while writing this Java class that could be serialized into a socket, I fell asleep and had a weird dream. In my dream, when I ran the program, the socket and the class object ...
8
votes
1answer
484 views

What song are these lyrics from?

function me(something){ something++; } something != same; Can you guess the song based on the lyrics above?
7
votes
1answer
354 views

Time to unlearn. What's this movie quote?

This Java snippet describes a quote from a movie. Can you find the quote? void function (int number, int attempts) { { if (number > 1) { do { System.out.println('something'); ...
2
votes
2answers
300 views

What is the result of the sum?

$A_1$: lateral-thinking 0H828JD1FGHODB82JOO $A_2$: computer-puzzles 01111011 $A_3$: visuallateral-thinking (Sorry if you are colorblind..) $A_4$: ...
14
votes
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 ...
7
votes
4answers
2k views

Find the hidden message

The Clues All the information you might need is here in the post UmVtZW1iZXIgdGhhdCBhdCBmaXJzdCB5b3UgYXJlIG9mZiBieSBvbmUu DRMExcuKJrKSGE/...
14
votes
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 ...
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 ...
5
votes
1answer
2k views

Image steganography/ hidden message inside image

I have the following image I'm new to solving puzzles and figuring them out, and I have no idea how to approach decryption of this image or how to solve it. I've tried running it on some image ...
9
votes
1answer
206 views

Octospider Cousins

This was inspired by the octospiders in the Rama series by Arthur C. Clarke. Reading the series is not a requirement for solving the puzzle and actually wouldn't help at all besides being able to say, ...
6
votes
1answer
1k views

Junk decryption— a puzzle I found on a wargame site [closed]

I have found this puzzle and I wanted to share it with you to see if anyone can solve it, because I can't figure it out. **Can you put this all together?** From: Agent J To: adib Agent, ...
6
votes
1answer
408 views

What would Lincoln say?

I got asked this question on a job interview, I am not sure if this is a right place to ask but here it is: If Abraham Lincoln were to give an address today, what would he say about us? Hint: 63, ...
26
votes
9answers
9k views

Computer riddle: I treat vars like D

Little 'bout my age: far from that of B Yet in my syntax, you will find some C The way I treat vars, that is much like D I do take objects, but I'm not like E If it starts with F, you'll know ...
6
votes
2answers
368 views

When hackers hike

One day you were taking a hike in some foothills somewhere near the East Coast of the US. It was clear another hac– umm, hiker had already been there when you came across the following munged ...
15
votes
1answer
967 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 ...