Newest Questions
14,357 questions
11
votes
10
answers
638
views
Albuququerquerquerquerque challlengenge
Introduction
Esolangs.org user "Tommyaweosme", after getting 3-4 hours into a 17-hour video called "albuquerque but every time a word repeats it loops (normal speed)", created this ...
- 151
2
votes
0
answers
79
views
63 ways to split your string in YAML
There are 63 ways you can split a string across multiple lines in YAML. Your task is to write a program that outputs a YAML array that demonstrates all of them and their key features, in any order.
A ...
- 4,136
-2
votes
0
answers
89
views
Prime ASCII Mock Text Converter [closed]
Prime ASCII Mock Text Converter
Task: Write a program that transforms input text by selectively alternating the case of alphabetic characters (A-Z, a-z) if their ASCII codes are prime numbers. The ...
- 1
-4
votes
7
answers
254
views
Produce 2025 in any human language, without those characters in your code
It's 2025! Write a function/program that outputs this number in words.
There are two twists:
You can write it out in (almost) any human language (including English).
None of the characters in your ...
- 4,136
6
votes
0
answers
92
views
How many polygons overlap? (hard)
Write a program or function which, given 1 or more polygons, determines the greatest number of polygons overlapping at a single point. That is, if each polygon was a piece of paper positioned ...
- 4,136
12
votes
14
answers
2k
views
Noise Cancelling Headphones
Alex ([email protected]) Hey champ, we've just had a huge order for those new noise-cancelling headphones we're meant to be making. Unfooooorrttunately... ...
- 511
10
votes
1
answer
166
views
Draw the caustics in a cup
If you have ever consumed liquid from a shallow cup in sunlight, you may have noticed a shape like the following at the bottom:
You might notice a nephroid shaped bright outline, a brighter area on ...
- 13.9k
-3
votes
0
answers
38
views
I need help in solving following template error when compiling a solver in openfoam7 [closed]
Making dependency list for source file phaseModel.C
g++ -std=c++11 -m64 -Dlinux64 -DWM_ARCH_OPTION=64 -DWM_DP -DWM_LABEL_SIZE=32 -Wall -Wextra -Wold-style-cast -Wnon-virtual-dtor -Wno-unused-parameter ...
-5
votes
1
answer
142
views
Daily Motto Finder
The daily motto is a project by me, allowing unique and dynamic motto every day.
Here, you’ll attempt to rewrite my code, making it code-golf style. The motto uses a specific algorithm, determining ...
- 1
13
votes
8
answers
1k
views
Chisanbop complexity
Chisanbop is a simple method of counting from zero to ninety-nine on two hands invented by Sung Jin Pai and revised by his son Hang Young Pai.
To make numbers, zero, one, or more digits are raised, ...
- 112k
3
votes
7
answers
390
views
Custom variations of Niemöller's poem ("First They Came")
The "First They Came" poem(*) by German pastor Martin Niemöller:
First they came for the socialists, and I did not speak out—
Because I was not a socialist.
Then they came for the trade ...
- 357
8
votes
2
answers
153
views
Primitive words
Given a list of values, 1, 2, -1, or -2, we will allow the following simple moves:
Remove adjacent values which are negatives of each other. e.g. ...
- 102k
3
votes
4
answers
185
views
Fill in the blanks of this equation
Your task is to write a program or function that can fill in the blanks of an equation provided in this form:
_ + _ / _ = 4
In this case, a valid solution would be:
2 + 8 / 4 = 4
Each blank must be ...
- 4,136
15
votes
6
answers
455
views
Block covered cycles
Given a cycle of non-zero numbers we say a "block" is a substring appearing immediately after \$n\$ and immediately before \$-n\$, which contains neither \$n\$ nor \$-n\$.
Here is an example ...
- 102k
22
votes
24
answers
2k
views
Output the 32 points of the compass
The 32 points of the compass are:
N, NbE, NNE, NEbN, NE, NEbE, ENE, EbN, E, EbS, ESE, SEbE, SE, SEbS, SSE, SbE, S, SbW, SSW, SWbS, SW, SWbW, WSW, WbS, W, WbN, WNW, NWbW, NW, NWbN, NNW, NbW
(SEbE is ...
- 4,136
0
votes
8
answers
206
views
Name the nth Tama successor
Tama was a cat born 26 years ago today who gained fame for being a railway station master and operating officer at Kishi Station on the Kishigawa Line in Kinokawa, Wakayama Prefecture, Japan.
Photo ...
- 1,623
6
votes
8
answers
796
views
Implement PHMINPOSUW (Packed Horizontal Word Minimum)
PHMINPOSUW (Packed Horizontal Word Minimum) is a specialized x86 instruction that finds the minimum value and location of a 16-bit unsigned integer in an 8-element vector packed into a 128-bit ...
- 11.1k
3
votes
10
answers
537
views
Box drawing number display
Similar:
Display words using 7-segment display
Seven Slash Display
My first challenge
Using the box drawing symbols (─│┌┐└┘├┤┬┴┼╴╵╶╷ or ...
14
votes
25
answers
1k
views
Draw X numbers from range Y
Inspired by this question
Task:
Given integers X and Y:
Randomly select an int in 1..Y (inclusive), X times. This selection is to be performed without replacement ...
- 1,623
7
votes
1
answer
211
views
Fitch Proof of \$(p\Longrightarrow q)\iff\lnot p\lor q\$ with least amount of steps
In the smallest amount of steps, prove
$$(p\Longrightarrow q)\iff\lnot p\lor q$$
We base the proof system on this website. The related functionalities are:
Assumption. Assume that some statement is ...
- 533
7
votes
7
answers
784
views
Conversion between CESU-8 and UTF-8 (for supplementary characters)
The Compatibility Encoding Scheme for UTF-16: 8-Bit, also known as CESU-8, is a Unicode encoding that is not part of the Unicode standard, but mentioned in a Unicode Technical Report as a ...
- 357
7
votes
1
answer
271
views
Ruler-and-compass constructions
In this code-golf challenge, you will work with a construction that was used by the ancient Greeks: the straightedge-and-compass construction. In particular, you will count how many different ...
- 9,101
11
votes
3
answers
363
views
UTF-8 character decoder (with invalid sequence handling)
UTF-8 is the most widely used character encoding on the internet. It encodes a Unicode code point into a byte sequence of 1 to 4 bytes long.
The UTF-8 encoding has many features that makes it popular, ...
- 357
-2
votes
0
answers
60
views
Pi Calculating Challenge [duplicate]
Using as few characters of code as possible, create code to calculate at least 1000 digits of Pi within 1 second.
- 1
13
votes
11
answers
1k
views
Bespoke numbers
Introduction
Bespoke is an esoteric programming language I created in January 2025, where the commands are encoded into the lengths of words in the program. For example, ...
- 621
2
votes
1
answer
220
views
Long running section 11.4 Minsky machine
Challenge
We define a Minsky machine as a program made of the following two instructions:
+X which increments the register X and continues to the next instruction
-Xn which simply continues if X is ...
23
votes
10
answers
2k
views
Turn a string into a snake
Write a function or program which writes an input string out as a snake.
The snake starts heading to the right. If a / or \ ...
- 4,136
3
votes
1
answer
215
views
Count number of families of sets satisfying a list of criteria
CHALLENGE
This problem has a math background.
For n=1,2,3,4 we want to count the number of families of sets with maximum n elements that satisfy many criteria of the form:
$$\bigoplus_{k\in A,A\in \...
- 169
7
votes
6
answers
2k
views
Bring back cup stacking
Do you remember cup stacking? Young competitors compete to see how quickly they can arrange 12 upside-down plastic cups into three consecutive arrangements of cup pyramids.
The number of each cups in ...
- 4,136
7
votes
8
answers
2k
views
The Oreo Problem: How to find the Excess
This problem is inspired from this childhood advertisement I remembered of while making biscuits with my checkers. Assume you got a black checker, and white checker on top of it, and another black ...
- 1,912
12
votes
4
answers
1k
views
Efficiently navigate a 6 sided die
An ant needs help moving around specific faces on a 6 sided die in order. Write a program or function which, given a series of numbers between 1 and 6, outputs the shortest set of instructions to ...
- 4,136
4
votes
0
answers
181
views
Find the factor to use for shortest simple Brainfuck data initialization loop
I like writing answers using Brainfuck, since this language basically simulates a Turing machine, and it is pretty challenging to find the shortest answer for any problem, since there are a lot of ...
- 674
11
votes
9
answers
869
views
All possible swaps for the permutation
Given a permutation of {1,2,...,n} named A, do each swap of form swap A[i], A[j] exactly once, where ...
- 30.8k
6
votes
2
answers
143
views
Inequality region vertices with 4 equations
Given the following inequalities:
$$
\begin{align}
ax+by&\leq c\\
dx+ey&\leq f\\
gx+hy&\leq i\\
jx+ky&\leq l
\end{align}
$$
These inequalities enclose a region in the shape of a convex ...
- 139
10
votes
2
answers
220
views
Make a pretty cryptic crossword grid
Write a function/program that generates an aesthetically pleasing square cryptic crossword grid for a given size N. You do not need to include numbers.
The rules for aesthetically pleasing are:
The ...
- 4,136
15
votes
7
answers
1k
views
Draw all 11 cube nets
There are 11 ways of flattening a cube onto a flat surface, like a piece of paper, which can then be folded back up into a cube. Each of these is called a cube net.
Your task is to write a program or ...
- 4,136
21
votes
17
answers
1k
views
Convert a parent vector to a depth vector
Consider the following diagram of a tree structure, with each node numbered by its index in a depth-first pre-order traversal:
...
- 12.2k
17
votes
13
answers
2k
views
Fix that slightly incorrect sum!
Oh no! A beautiful addition has been ruined by a typo.
Write a function which can fix a single incorrect digit in an otherwise correct sum.
Input
Three integers a, <...
- 4,136
12
votes
4
answers
1k
views
Who's that evolution?
Given two first generation pokemon names as input, write a function (or a whole program) that outputs a Truthy value if the second one is an evolution of the first one (and a Falsy value otherwise).
...
- 2,162
-6
votes
4
answers
302
views
Find the argmin of the cusum
Input
You will be given an array arr of length 10 of float64s. They will all be between -1 and 1.
Output
You must give the index in the array of the minimum value ...
- 3,127
12
votes
8
answers
737
views
Output the symmetric inverse semigroup
The symmetric inverse semigroup is a very important object in the study of semigroups, for a number of reasons, but most obviously due to the Wagner-Preston theorem. In brief, for any set \$X\$, the ...
- 50.5k
0
votes
2
answers
243
views
minimum line queries in logarithmic time
Input
You are given 2 positive integers, n, q, followed by q queries. the queries can be of two forms:
0 a b: add the line a*x + b. a and b are integers between -...
- 85
8
votes
5
answers
2k
views
Tips for golfing in ☾ (Moon)
What general tips do you have for golfing in ☾ (Moon)? I'm looking for ideas which can be applied to code-golf problems and which are also at least somewhat specific to ☾ (e.g. "remove ...
- 12.2k
12
votes
14
answers
1k
views
Generate the indices of the corners of the 12 face triangles of a cube
A cube has 6 faces. We can define it in terms of triangles only, by splitting each square face on the diagonal.
Each vertex of the cube is numbered 0 through 7. The coordinates of a vertex are that ...
- 121
9
votes
15
answers
1k
views
A121016: Numbers whose binary expansion is properly periodic. or A328594: Numbers whose binary expansion is aperiodic
I have been studying how to compress the Dis programs into their equvalent ones. One of the possibly easiest subset is programs with only } and ...
- 1,187
5
votes
3
answers
2k
views
AAAAAAAAAAAA!!!! expressions
AAAAAAAAAAAA!!!!, which is 14 A's and 4 exclamation marks, is a procedural esoteric programming with no implementations yet created by User:Zzo38 first appeared in 2006. As the language name suggests, ...
- 1,187
15
votes
17
answers
1k
views
Counting Gessel walks
OEIS A135404 gives the number of Gessel walks \$g(n)\$ of length \$2n\$. A Gessel walk is
a walk on the square lattice starting and ending at the origin
with possible steps (1,0), (-1,0), (1,1), (-1,-...
- 4,391
7
votes
4
answers
1k
views
Tips for golfing in array languages
We already have a few language-specific tips threads for languages which fall under the array-language umbrella, but there are many golfing tricks which are more or less universal among these ...
- 12.2k
14
votes
4
answers
2k
views
Generate a 45x45 solved crossword puzzle
2025 is an odd square: 2025=45*45. This is the only such year in our lifetime, so let's celebrate it!
Your code should output a matrix of dimensions 45 by 45. Each element in the matrix should be an ...
- 14.1k
14
votes
19
answers
2k
views
Antiparallel 12-hour Clock Hands
Output (or print) each of the 11 times, one per line, in the POSIX %I:%M:%S format, at which the hour and minute hands of a 12-hour clock are antiparallel. Here <...
- 801