All Questions
13,926
questions
4
votes
4
answers
142
views
I baked you a pie!
There is an asdfmovie video about a pie flavoured pie. Someone also made an edited version with more pies, so I created this challenge.
The input is a positive integer.
The code should first output ...
- 179
13
votes
13
answers
495
views
Implement a simple stack language
In this challenge, you implement an interpreter for a simple stack-based programming language. Your language must provide the following instructions:
push an arbitrary integer
pop two numbers and ...
- 711
8
votes
7
answers
466
views
Auto-golf an esolang
The lack of a social life drove a poor nerd into inventing another superfluous esolang called !+~%. For no good reason it initializes the accumulator with ...
- 1,998
5
votes
11
answers
214
views
Output an image
Interestingly, although there are challenges that work with images, there is no challenge to simply output an image. This is that challenge
Goal: output an image in the shortest possible code.
Output: ...
- 171
7
votes
0
answers
127
views
Solve the word problem*
In this challenge you will receive a list of positive integers \$W\$ called a word, and a square symmetric matrix \$M\$. Your task is to determine if the word can be turned into the empty list by ...
- 96.6k
-1
votes
2
answers
101
views
Shapes Biscuits - An Un-identical paradox [closed]
Puzzle
I have a packet of Shapes biscuits. I would expect all of them to be identical, but alas, stacking all of the Shapes does not result in a perfect hexagonal prism.
I'd like to find out what ...
- 7
8
votes
2
answers
609
views
Point-free JavaScript: write a function runner
In this programming-puzzle, your goal is to write the following function in JavaScript, using (essentially) point-free programming:
(f) => void(f())
Your ...
- 18.6k
1
vote
14
answers
466
views
Smallest integer \$n\$ such that \$\frac{\sqrt{\log_2{n}}}{(\log_2 {\log_2 n})^2} > 1\$
Write code that outputs the smallest integer \$n > 5\$ such that \$\frac{\sqrt{\log_2{n}}}{(\log_2 {\log_2 n})^2} > 1\$. Your code may have at most one digit in its source code. You can use ...
- 2,024
9
votes
0
answers
111
views
Construct the Constructability sequence
Consider compass-and-straightedge construction, where you can construct new points from existing ones by examining intersections of straight lines and circles constructed with one of the following two ...
- 49.5k
2
votes
0
answers
136
views
Clone GNU cat 8.32
Write a program that precisely clones GNU cat version 8.32, which is
installed on my computer.
In any case, if called with the same arguments, same stdin, and same ...
- 1,216
-1
votes
11
answers
373
views
Print 100 digits of Champernowne's Constant
Inspired by this and this question
Challenge
Your challenge is to print any 100 consecutive digits of Champernowne's Constant. You must give the index at which that subsequence appears. The 0 at the ...
- 165
-1
votes
0
answers
58
views
Getting the full rainbow every rgb or hex color hue [closed]
Output should be a array of hex colors or rgb colors
Here’s my code I made it can also get rgb colors but I wanted to put hex for fun
...
13
votes
14
answers
1k
views
What's the character limit of this text field?
Someone I know has no coding experience, but has proposed an algorithm* to determine the character limit of text fields they find online. They copy a string containing the numbers from 1 to 1,000 ...
- 643
13
votes
7
answers
1k
views
Compute probability of seeing all the balls
Given \$x\$ distinguishable balls (say they have different colors), sample with replacement repeatedly until all the balls that have been seen, have been seen at least twice.
Challenge
The input is ...
- 2,024
9
votes
7
answers
1k
views
Night hike partitioning
We want to go on a night hike with the youth group, but of course not everyone has their torch, even though we told them we planned to split up. What options are there for group formation if n teens ...
- 1,998
-1
votes
0
answers
127
views
What is the shortest regex for the name "SAMUEL"? [duplicate]
Suppose that someone is trying to access records from a database on swim lessons.
At one point during the conversation, a customer says, "The student's name is Samuel Doe".
However, the name ...
- 187
0
votes
0
answers
69
views
What is the shortest regular expression (REGEX) you can create for variants on the name "ELLEN"? [duplicate]
Imagine a partially automated customer service phone line.
At one point during the conversation, a customer says, "My name is Ellen Doe".
However, the name on record is spelled differently. ...
- 187
11
votes
14
answers
3k
views
Can the chefs go?
On the TV cooking show Guy's Grocery Games, the chefs cannot begin shopping until Guy Fieri, the show's host, says "Three, two, one, go!" However, the words do not have to be all together. ...
- 1,216
5
votes
4
answers
752
views
Perform Gray Addition
Objective
Given two non-negative integers encoded in unbounded-length Gray code, add them and output the result, where the result is also encoded in Gray code.
Gray code
There are many equivalent ...
- 5,497
16
votes
10
answers
4k
views
0
votes
1
answer
74
views
Parse nested absolute values 2 [duplicate]
Looking at
Arnauld's answer, it seems like this version is not really more difficult than the other version, so I made it an optional requirement of the other challenge
The absolute value of a number \...
- 5,865
14
votes
6
answers
767
views
Parse nested absolute values
The absolute value of a number \$x\$ is normally written as \$|x|\$. The left and right side of the absolute value uses the same symbol, so it is not immediately obvious how to parse nested absolute ...
- 5,865
22
votes
12
answers
4k
views
80% of respondents agreed…
Sometimes I see a claim like "80% of respondents agreed" and I think "what was your sample size? 5?" because, of course, with a sample size of 5 it's possible to get 80% to agree ...
- 3,423
5
votes
3
answers
789
views
Golf an HQ9+ transpiler
There was a prior question about golfing an HQ9+ compiler that translates HQ9+ code into the language it is written in, but that was closed as a duplicate of the interpreter challenge because ...
- 1,216
11
votes
3
answers
573
views
Write the date in abbreviated Latin
Inspired by How do you write dates in Latin?
Challenge
Given a month-and-day date, output that date in abbreviated Latin, as explained below.
Input
Input is flexible. You may choose to:
Take a date ...
- 699
13
votes
11
answers
2k
views
Ungolf the Wind
Weather conditions at airports are reported to pilots in METAR (METeorological Aerodrome Report) format. This format could be described as being "golfed." Here are some examples:
...
- 1,216
16
votes
8
answers
921
views
One-dimensional map colouring
It is a well-known fact that you can colour a two-dimensional map with four colours in such a way that two countries with a common border always have different colours. There have already been enough ...
- 1,998
15
votes
9
answers
2k
views
Write a Web server quine
Write a program that accepts HTTP requests on any port of your choice above 1024, and responds to requests on any URL of your choice with its own source code. It must work with, at least, Firefox and ...
- 1,216
16
votes
20
answers
2k
views
Just another traffic jam!
One lane is closed, the vehicles have to thread their way in according to the zip-lock system: One car from one lane, the next car from the other lane, always taking turns.
Input: Two vehicle queues, ...
- 1,998
0
votes
21
answers
860
views
How Many Paint Tins Do I Need?
Task
Take in 3 inputs. The length of the wall, the height of the wall and the coverage of the paint. Output how many tins of paint are required.
Output
Since there's no way to purchase ...
- 547
16
votes
16
answers
4k
views
Which skill to train?
Story (skip, if you prefer the naked task): You need five skills for an imaginary sport: Speed, strength, endurance, accuracy and tactics. If you achieve a score in each of these disciplines, you can ...
- 1,998
4
votes
1
answer
193
views
Convert real numbers between factoradic and positive integer bases
This prompt asked you to convert back and forth to factoradic, but is very limited in scope (only decimal integers from 0 to 10!-1). Your task in this challenge is to reach just a bit further and ...
- 189
-3
votes
1
answer
210
views
Bingo Cards SVG Code [duplicate]
Generate the contents of an SVG file containing 6 bingo cards. Winner is the one that uses the shortest code. A qualifying answer has an output that can be directly pasted in a blank to get the ...
- 175
5
votes
4
answers
945
views
Shortest C code to display argv in-order
I recently tried to produce the shortest C code possible to display all its command line arguments (which are stored in argv).
I ended with a relatively small piece of code, and I was wondering if ...
- 163
8
votes
1
answer
262
views
Tips for Golfing in Vyxal 3
The reason for this question is because I made a deadlineless bounty and I need a tips question to link in the bounty
Vyxal 3 is the third major version of the Vyxal golfing language. As it is ...
- 32.3k
19
votes
38
answers
3k
views
Print the Christmas alphabet
Write a program to print or return one of these strings verbatim:
abcdefghijkmnopqrstuvwxyz
ABCDEFGHIJKMNOPQRSTUVWXYZ
Notice that there is no L.
- 1,216
1
vote
0
answers
132
views
Produce a secure block cipher round function (1 bit round key; 7 bit message)
We need to produce a block cipher round function with a 1 bit round key size and a 7 bit message size with the highest level of cryptographic security according to our measure of security.
...
- 391
18
votes
35
answers
2k
views
Rudin-Shapiro sequence
The Rudin-Shapiro sequence is a sequence of \$1\$s and \$-1\$s defined as follows: \$r_n = (-1)^{u_n}\$, where \$u_n\$ is the number of occurrences of (possibly overlapping) \$11\$ in the binary ...
- 46.7k
15
votes
2
answers
2k
views
Shortest Algorithm* That Generates a Harlequin Pattern
What is the shortest sequence of moves that, from the solved state of the cube, creates a pattern that meets the following criteria:
6 colors on each face
at most 2 facelets of the same color
no ...
- 293
0
votes
0
answers
71
views
Write a checker quine [duplicate]
Write a program that takes a string as input and returns truthy if the string is the same as the source code, falsy otherwise. The usual restrictions on quines apply.
- 1,216
9
votes
3
answers
560
views
Get the Bible verse
Write a program that accesses Project Gutenberg's KJV Bible, either from a file called pg10.txt in the working directory or in any other way that is typical for the ...
- 1,216
-3
votes
4
answers
209
views
Answer a Loaded Question (with Lojban!) [closed]
A loaded question is something like 'Have you stopped swearing?' in which both yes and no answers mean that I have swore, meaning it is impossible to answer the question if I haven't swore.
However, ...
- 179
19
votes
9
answers
2k
views
Limited letter renderer: BIOPD
There have of course been challenges to render ASCII art fonts here and there. This challenge doesn't add anything to those. In contrary, it subtracts from them for a good reason. If you allow all ...
- 1,998
13
votes
21
answers
4k
views
German pharmacy payment
Your task is to calculate the amount you have to pay for prescribed medication at a pharmacy in Germany. The amount is simply based on the full price of the item, which will be your input. It is a ...
- 4,907
-10
votes
1
answer
327
views
Bingo Cards PDF
Write code to generate a PDF file containing 6 bingo cards. Winner is the one that uses the shortest code and needs no actions except for installing a library and running the code. (No Save As PDF). ...
- 175
15
votes
13
answers
1k
views
Golf Transmission
As in, the 5 speed transmission from the original VW Golf GTI.
Print the transmission pattern in as few bytes as possible.
Yes I know this isn't what it actually looks like but the GTI 5 speed shift ...
- 2,138
14
votes
22
answers
2k
views
Decode the date in Christmas Eve format
This is the inverse of "Encode the date in Christmas Eve format."
Write a program that takes as input the string Christmas, possibly followed by ...
- 1,216
10
votes
36
answers
3k
views
7
votes
2
answers
303
views
How many twisted corners?
Your challenge is to output the number of twisted corners given a 2x2 Rubik's Cube scramble.
For the purpose of this challenge, twisted corners are defined as corners where the colour of the top/...
- 8,563
17
votes
21
answers
2k
views
Monotone sequence beatitude
Provided that the input is a monotone sequence of three or more integers:
Output -2 if the sequence strictly decreases. Example: [7,4,3,2]
Output -1 if the ...
- 5,497