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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The France Public Holiday's Distance Grid

French Public Holidays We consider the following rules that apply to the 11 French public holidays : New Year's Day : 1st of January Easter Monday : Monday following Easter Sunday which is the next ...
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0answers
181 views

Reverse Engineering Computer Formula

A computer uses an unknown formula to create a 4 digit Output using specific Input. Here are 3 examples: Input = 20066 : 020470 : 47 : 1 : 322267 Output = 0927 Input = 20066 : 020470 : 46 : ...
7
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1answer
143 views

Find the secret word hidden in this message

(TL;DR at the bottom) The following message was received from a friend: I need you right away to help me use 0x1DD1A to find out how to set up my ...
38
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3answers
2k views

What comes next in the sequence?

My roommate has insomnia so he was counting sheep to help him sleep. He started with $2986$, then continued with $47786,\ 764586,$ and $12233386$. What sequence is he following, and what was the ...
3
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1answer
558 views

Challenge on ASCII Codes

My friend shared a challenge puzzle with me but I don't have any idea on this? I believe that it's related to ascii characters.
8
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2answers
318 views

Can you open a safe with a lengthy complicated combination?

Two cousins were talking about their parents' safes. "They said I can keep my comic books in their safe, if I figure out the right combination, and enter it on the keypad correctly on my first ...
2
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1answer
149 views

What is a Perfect Inquirey Word™?

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 word conforms to a special rule, I call it a Perfect Inquirey Word™. ...
19
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2answers
437 views

Reverse (Big) Boggle

This is a puzzle that I've worked on-and-off for quite a few years, but not being a competent coder, I haven't worked out a definitive solution. I suspect the 1st part is impossible but haven't proved ...
5
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0answers
336 views

What is a 255b Word™?

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 word conforms to a special rule, I call it a 255b Word™. Use the ...
6
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1answer
231 views

12 Distinct Weights' Sorting

There are 12 balls with all different weights. You want to sort these balls by weight. You have a friend who will help you with the ordering process. In each step, you give any 4 balls to your friend ...
7
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1answer
265 views

Heavy-duty computing challenge — maximum-density word packing

Caution: This is a challenge for computers only. Humans are advised to stand well clear of the protective safety cage. There may be CPUs on fire before it's over. Introduction Nothing makes a ...
3
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1answer
167 views

Scrambler and key!

You are given three files. One is a snippet from scrambler.py file: ...
11
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4answers
908 views

Can multiple wall timers turn lights on or off when required?

Imagine we have some simple mechanical 24 hour wall timers like this: There’s one restriction though, they’re badly designed so each one can only turn on once and turn off once in a 24 hour period (...
18
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3answers
5k views

A shy person in a queue

I'm so shy when between people. When in a queue, I'd like to be the last. That's the only time when I'm not shy. When consuming food, I'd take one or two, or even four, depending on the context. What ...
1
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1answer
189 views

Molly and a pseudocode

Molly was given a pseudocode by her teacher and told her you need to understand the pseudocode to answer the riddle. Riddle: I am _________ like universe and stars You will find me in computer ...
5
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1answer
271 views

map 5 unequal ranges to id

This is actually coming from a business place, but it's all about being able to do math tricks, and that's why I'm posting here. I want to implement the following function: ...
9
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1answer
376 views

“Brainf*ck, but not really.”

Yesterday, I organized a contest with various challenges the participants had to solve. I put 6 very simple puzzles that were solved almost instantly, and the deadline was supposed to be until Sunday. ...
0
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2answers
170 views

Hunting for treasure in 1-d grid [duplicate]

In a castle, there are N rooms in a line. Each room has a door to the two neighbouring rooms (or the one neighbouring room, for the rooms at either end). A treasure is hidden in one of the rooms. ...
8
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1answer
297 views

What is a Fade Word™?

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 word conforms to a special rule, I call it a Fade Word™. Use the ...
6
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5answers
476 views

What is my name? It's not “traveler”

The answer to this puzzle is my first name. What is it? If no progress is made after a week or so, I'll slowly give hints. It's not too hard of a puzzle, so long as you take everything into account. ...
2
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2answers
191 views

How to find number of times sequence element $1$ is approached and from where?

Consider a sequence $1,-1,-1,-1,-1,-1,...,-1$. Start at the first element and move down the sequence according to the following rules: 1) If you jump from a $-1$ to another $-1$, turn the latter into ...
10
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2answers
2k views

sorting 4 numbers using Min - Max boxes

Min-Max is a box that is capable of determining which of the two numbers is the higher (Max) and which is lower (Min). I need to use minimum amount of boxes in order to sort 4 different numbers (any ...
0
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1answer
168 views

Find the 33rd two characters, and where they belong

I'm working on a puzzle. I'm about 75% of the way through solving the puzzle. The only thing left is you hash 33 two character pairs. I have 32 two character pairs. Possible characters are [a-z, ...
8
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6answers
840 views

Restoring order in a deck of playing cards (II)

Michelle has a deck of 52 playing cards 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 takes the ...
13
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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 ...
2
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1answer
181 views

The “Jumbled” Cipher

The elusive "Jumbled" cipher has stumped scientists and cryptographers alike... Not really, but it will stump you soon... The Jumbled Cipher is a mysterious text cipher that puts text into an ...
19
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2answers
514 views

The Sequencer - da-da-daaa!

This is what the diagram on the machine looked like: And this is the output that was in the box. ...
3
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2answers
154 views

The fantastic matrix

Here's another question that I have been asked in an interview lately. Let $M$ be an $n × n$ matrix whose values are $”+”$ and $”-”$. M is called fantastic if it is possible to make all it's values $”...
17
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2answers
531 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 ...
21
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4answers
889 views

Consecutive integers around a circle

Find a block of positive consecutive integers that can be placed around a circle in some order so that any two adjacent numbers always have a common divisor greater than 1.
2
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1answer
109 views

Pairwise coprime numbers in a 3 x 3 board

Find all the ways of placing all the digits 1 to 9 in the cells of a 3 x 3 board in such a manner that the seven three-digit numbers that can be read horizontally (from left to right), vertically (top ...
2
votes
0answers
150 views

A partition of 79633 into thirteen parts [duplicate]

The sum of thirteen positive integers is 79633. If placed appropriately on the vertices of this graph, two of them will be joined by an edge if and only if they have a common divisor greater than 1 (...
9
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1answer
259 views

Scoring Oracle: Bob easily wins, but how much?

Bob meets a magician with two bags and a chest on a bridge. The magician challenges him with the following enigma: Here is a bag A, holding 5080 pebbles. Here is another bag B. Most of the pebbles ...
7
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3answers
231 views

A 4 x 4 Magic Square with Pairwise Relatively Prime Entries

Find a 4 x 4 magic square of positive integers such that any two of its entries are pairwise different and relatively prime, i.e., have no common divisor greater than 1. What is the least that the ...
8
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2answers
238 views

From one color to another

white turns to blue blue turns to red red turns to aquamarine but green stays the same People from StackOverflow might appreciate this one.
13
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5answers
642 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 (...
16
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6answers
562 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 ...
1
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2answers
139 views

A Fun, Fantastic, Phonic Cipher!

An old friend of mine recently sent me an email. Being a linguist, he always finds creative (read: annoying) ways to use his words to baffle me. After about five minutes, I usually just give up. ...
0
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1answer
178 views

One-word riddle (possibly python)

The question/riddle is: "Never has a snake given such words of wisdom." The hint is: "Thou shall never pass errors silently!" It is possible to be related to Python, errors or something like that. ...
8
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3answers
1k views

What date encoding could this be?

40 years ago I read a book, but couldn't remember the title. I've been looking for it for a while, and I finally (finally!) found it! And then I worked out why it took so long. It hasn't been ...
7
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1answer
218 views

Can you give us a statement?

Picture an 11x11 grid. Each cell must contain one character. This can be any ASCII character. The contents of the entire row must validate against both corresponding H regex clues. And the contents of ...
10
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3answers
591 views

Where is the money?

When I was just a little kid my parents died in a terrible accident, and I was left alone in the world. When I reached the age of 18, I received an envelope with a letter that read the following: ...
7
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1answer
133 views

Statements in Java

Each code block translates to a specific statement in English. There is a theme behind the statements. As code puzzles tend to be "easier" (relative to other PSE puzzles) than expected, it will not be ...
4
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1answer
103 views

question of royal proportions

I dont know if this is going to be any good but this is my first attempt at on of these puzzles. The following piece of code relates to a famous saying/phrase/article/piece. ...
3
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1answer
256 views

Applied logic challenge problem #2

This is similar to my previous Applied Logic Challenge Problem but with a significant difference at the end which could make this problem somewhat more difficult. Again it is a problem of my own ...
4
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2answers
220 views

Applied logic challenge problem

You must determine what can be concluded from the 60 true statements below. The numbers in each statement represent binary values (true / ...
18
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2answers
459 views

An Artwork Made from Several Countries

Last year I went to 12 different countries around the world. I made an AI to convert every country that I've visited into a beautiful artwork as a reminder. I input the 12 countries name, then somehow ...
-1
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2answers
371 views

What's the Difference?

*not sure if this counts as a real puzzle, but I will ask it anyways. Can you catch the difference between the 2 following letters? х ...
9
votes
1answer
384 views

Puzzles like Sokoban?

I am looking for some puzzles like Sokoban or 15-puzzle but more difficult to solve and satisfy the following requirements: The number of possible moves at each step should be limited, let's say < ...
-3
votes
1answer
83 views

You see me right now… but you can't

Look over here! Oh... that's right. I'm too small to be seen. But you are still looking at me. Crazy! I know right? Here, how about this? You guess what I am! Okay. Well if I get too much ...

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