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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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 ...
-2
votes
2answers
344 views

My Program Kept Failing — But Why?

I've been working on a Turbo C program for a while now. I had my usual share of bugs and fixes, until it got a really weird error -- an error that could only be explained by something accidentally ...
6
votes
2answers
517 views

Boggling googling

I'm a number for you to evaluate, Googling 'me' gives the drop off the Empire State, Though the great Google finds no results for me, I'm just a pure integer value you'll see. What number am ...
6
votes
4answers
734 views

MS Excel Die Hard

You are John McLane, and Simon Gruber is back in town. This time he booby trapped 50 nuclear power plants across the US, and sent you a laptop he prepared, along with the following note: Any attempt ...
3
votes
1answer
133 views

Determine all possible positive palindrome(s) numbers [closed]

Determine all possible positive palindrome(s) N numbers, such that the decimal representation of 2 x N^2 has no leading zeroes and contains each of the digits from 0 to 9 exactly once.
1
vote
1answer
212 views

Among the Worlds top language that I am, Would be the one that serves, Ultimately the n00bs!

Among the World's top language that I am, Would be the one that serves, Ultimately the n00bs!
10
votes
1answer
463 views

Conway's Siege of Life

They are immortal and they are killing us. We may not be able to kill them, but we might be able to keep them occupied, distracted, for eternity. But we need to figure out how. Before there are no ...
2
votes
1answer
309 views

What are the five most Linguistically Stiff numbers below 10^9

The linguistic stiff(LS) of a natural number is the ratio of the amount of letters in the writing of this number in English to the sum of amount of its digits and amount of vowels in it. For example, ...
3
votes
1answer
223 views

Guide dots to land on any pair of matching portals at the same time

Try it out here!$^{\dagger}$ $\hskip2in$ Question: First, I'll define the left blue dot as dot 1, and the right blue dot as dot 2. Left being <, right being <...
1
vote
1answer
181 views

Guide the dots to land on the portals at the same time

Question: First, I'll define the top left dot of the empty middle square as dot 1, and the bottom right dot of the empty middle square as dot 2. Left being <, ...
12
votes
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 ...
3
votes
1answer
410 views

What is a Number with Feeling™?

In the spirit of the What is a Word™/Phrase™ series started by JLee, a special brand of Phrase™ and Word™ puzzles. If a number conforms to a special rule, I call it a Number with Feeling™. Use the ...
25
votes
3answers
1k views

The PSE School of Enigmatics (Part 1)

Update: I fixed up the second image, making it (perhaps) a little bit easier to crack. You leap out of your bed. Today's the day! You check your mailbox, and wow, there it is! The frayed look of the ...
3
votes
8answers
975 views

An exercise on the powers without using the logarithm function

One can find on the forums a lot of exercise where the pupils call for help to solve their maths, once I came across an exercise similar to this one: Determine with a simple (non-scientific) ...
1
vote
1answer
1k views

The swap puzzle

The swap puzzle Place small coins heads up on the squares marked H and tails up on the squares marked T. Swap the positions of the Heads for the Tails in as few moves as possible. There are two ways ...
30
votes
5answers
1k views

The old tinkerer's safe

A client of mine died last Sunday - just as he was born on a Sunday. He was already at rather ripe age, and I had the pleasure to present his last will to his loving and caring family. As far as I ...
4
votes
1answer
272 views

Find the equality with all digits

$A\tfrac{B}{C}=100$ is the equality where A,B,C are numbers generated by combining all digit values $0,1,2,3,4,5,6,7,8,9$ only once for each digit in total. For example; $123\tfrac{4567}{890}$ is ...
6
votes
1answer
312 views

you probably read this wrong!

Read this carefully: ‮114 116 108 111 https://repl.it/010010010100‮11000110110001011000 What's my message? Hint:
19
votes
2answers
716 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 ...
2
votes
1answer
316 views

Two-Button Idle Game

Two-Button Idle Game is a puzzle that was made for but not included in the Galactic Puzzle Hunt, and can be found here. It was mentioned in the wrap-up (Caution: Spoilers!), but no solution was ...
19
votes
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 ...
22
votes
2answers
2k views

The Legend of Sally the Cow

I was looting exploring Pelagia Farm and I stole found this note in a locked chest on the ground. It seems that one of the farmhands had tried their hand at poetry. I want to know how it ends but some ...
27
votes
14answers
2k views

The master programmer and the mystical reversal

The master programmer sat at his desk, gazing into the distance, his eyes seeing, and yet unseeing. The lunch had been heavy. His reverie was interrupted by the appearance of his close colleague, ...
10
votes
2answers
645 views

Troubles with a Rogue Circuit

Edit : Made the final step to the solution easier to solve, also added hint. I’m not quite sure what’s happening over here, but I believe you guys might be able to help. I started noticing ...
14
votes
3answers
810 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 ...
6
votes
2answers
783 views

The Hyper-Modern Kidnapper: Crime Scene #4

The Story: As soon as he read the message that Lipwig found, Sergeant Vimes raced home, sirens blaring for traffic to move aside. His daughter was home in her room. His daughter was home in her room. ...
9
votes
1answer
4k views

Creating a Kakuro puzzle with unique solution

I start with a grid of black and white cells. I randomly populate the white cells from numbers (1-9) using kakuro rules. Then I calculate the horizontal and vertical sums. I remove the numbers from ...
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 ...
11
votes
1answer
372 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. ...
6
votes
1answer
258 views

She Lia Squared: Our daughter asked, “How many words can it make?”

For puzzle experts out there I'm certain this will seem trivial. Our daughter recently conned my wife and I into purchasing interlocking foam squares for her bedroom floor. On each square is a ...
11
votes
1answer
238 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 ...
7
votes
3answers
223 views

When is it worth using Hexadecimal over Decimal?

How many bits does a number need to have, to make it worth using hexadecimal notation of the form 0xHHH...H over its decimal representation of the form ...
20
votes
4answers
1k views

The Prison Escape Pt. 1 (THE DOOR)

You are currently escaping a prison owned by a mad scientist. As you were about to approach a large iron door that you think should be leading to the exit, a guard came out from the shadows. ...
11
votes
3answers
839 views

Little bit of a code in binary :)

Decode it and prove it :) Share if you think someone else can solve it. Here is a little bit of a challenge for lovers of code and encryption, the hints should be evident, but I think that I would ...
0
votes
1answer
147 views

Find 5 digits, which have the most numbers of prime numbers [closed]

If we have to use all available digits once, We can form 9 prime numbers from (2,5,6,7,8), they are : (25867,28657,56827,65287,65827,82567,82657,85627,86257) With the same rule, find another 5 ...
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 ...
15
votes
4answers
1k 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't ...
11
votes
1answer
569 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 ...
2
votes
2answers
379 views

The Pattern-Bot

This is an entry into the 20th fortnightly topic challenge. Over the past few days, I have been receiving a series of strange emails. I wonder if you could tell me what they are: Email 1: Sender: ...
11
votes
1answer
602 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 ...
26
votes
2answers
2k views

The Prognosticator

As I traveled across the web, searching far and wide, I came across an odd puzzle that made me feel awry. It foretold the future's path and predicted no tie. How could this puzzle work, and what was ...
7
votes
1answer
1k views

One Very Odd Email

Yesterday, I received a very strange email from a friend of mine. It was originally very hard to read and dribbled with extra characters, but I believe this is relatively the original message. It ...
5
votes
1answer
276 views

Can You Find a Tower of Hanoi Word?

Consider a simple Tower of Hanoi set consisting of three rods and three disks. This tower has an optimal solution of seven moves; these seven moves are the only ones allowed in what follows. For the ...
10
votes
2answers
512 views

What does this C function do?

C source code at: http://pastebin.com/6Bywk5mf Will also function in Java. Note that in C ...
6
votes
2answers
227 views

It's my friend.. again

Yet again, my friend is back at it! Just today, I asked him for something, and he sent me a blank image, though I have a certain feeling it's not blank. You guys helped the last time, but can you ...
7
votes
4answers
362 views

No Square Allowed

On a Chessboard, place as many chess pieces as you can. Position the center of each piece on the center of a square. Avoid placing any 4 pieces at the corners of a square (even a tilted square). ...
6
votes
2answers
2k views

I hope your internet's working

I'm new to this StackExchange - I'm more active on programming stack exchanges. So here's a computer-themed puzzle: 4K5L3RdR-PASTE Find the code (6 numbers) That'...
3
votes
1answer
1k views

Why is this Sudoku Skyscraper Failing?

I'm attempting to write a program that solves Sudoku puzzles using a variety of techniques. Up this point, I've only implemented naked singles and hidden singles (for rows and columns). I've been ...
0
votes
1answer
308 views

Crack the code (Java related)

I found a card of a company which must be several years old when cleaning my house. On this card, there is a riddle and I just can't figure it out. The code is the following: ...
11
votes
2answers
916 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 ...

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