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Encode PSK31 Given a string of ASCII text as output, encode it in BPSK31 using Varicode. If it is possible in your language, play the audio over the device speakers; otherwise, output an audio file in ...
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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 ...
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Clone GNU cat 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 ...
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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 ...
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Format Datetime in 30-Hour Clock Time code-golf date string Input a datetime, format the datetime in YYYY-MM-DD HH:mm:ss where HH...
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1 vote

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Decode Triple G Start 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 ...
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Implement a simple stack language In this task, you implement an interpreter for a simple stack-based programming language. Your language must provide the following instructions: push an arbitrary ...
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Divisibility counting Given two positive integers a and b, how many times can you divide a by b so that the result is a whole number without any decimal? For example, if a is 10 and b is 2, the answer ...
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Deja vu Given two arrays, let's call them a and b, and a number n, your task is to see if there exists a subarray in a so that that subarray's sum is n and there is a subarray in b that also sums to n ...
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Write a check Given the check (cheque, for non-Americans) number, payee, amount, and memo as input, print or return a check in this format: ...
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One-dimensional map colouring
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1 vote

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code-golf number natural-language Read a French number We have Spell out numbers in French, Translate numbers to French and Telling time in French, but we were missing the reverse: Challenge Read a ...
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Just another traffic jam!
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3 votes

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Classify a Coxeter group In this challenge you will take as input a Coxeter matrix representing a Coxeter group. Your program will then classify it as one of the following: Spherical Euclidean ...
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Prefix-Suffix equality, part 1 Given an array of two distinct byte-sized values, please perform the following operations or their equivalent: Construct an array of its nontrival prefixes and suffixes,...
Neil's user avatar
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date code-golf 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 ...
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1 vote

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Generate the snowflake pattern sequence A snowflake figure looks like this: A few rules govern how many points each ring can have. The innermost ring must have between 1 and 8 inclusive points. ...
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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 ...
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Which skill to train?
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4 votes

List of bounties with no deadline

200 reputation for golfing in Vyxal 3 Note that this is separate and distinct from the other Vyxal deadlineless bounty. Hi so Vyxal 3 exists and it's brand new and doesn't have very many answers at ...
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Write a Web server quine
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3 votes

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Derive an MIU string The MU puzzle in Douglas Hofstadter's Gödel, Escher, Bach involves a simple formal system called "MIU". It works as follows: MI is ...
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2 votes

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Compute the Kimberling Sequence code-golf Introduction The Kimberling Seqeunce is a sequence of sequences. Each sequence is defined in terms of the previous sequence and the previous stage number. At ...
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Draw minimalistic southpark characters code-golf image-output kolmogorov-complexity Your task is to output or draw this image of our favorite characters. It is obviously inspired from the logo of ...
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Manipulate a set of pixel grids @sandbox is this a dupe? I couldn't find one and was a bit surprised Your code should take in one input representing a number of boolean grids and one set of ...
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posted: Convert real numbers between factoradic and positive integer bases
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Implement the "Wolontis" Function While looking at old ALGOL documentation with someone else on Discord, this "famous" function popped up: Although it’s mentioned in other ...
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Definite policy about duplicate answers

Neither yes nor no, but: it depends I completely agree with xnor's view in normal competition. People solve the challenge, get the same result, one is a little faster: why punish the slower one? I'm ...
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4 votes

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English Golf Your challenge is to golf some English text by replacing some words with their contractions. Here is a list of the contractions you need to support: Words Contraction are not aren't ...
Neil's user avatar
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Bingo Cards PDF version here. SVG version here. Tags: code-golf card-games file-system Also ...
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I am a big fan of the famous 10 PRINT CHR$(205.5+RND(1));: GOTO 10. This will produce a maze like pattern with random generated symbols of / and ...
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Generic pop-con This is a pop-con. The objective validity criterion is that all answers are valid. Answer with most upvotes after a week will win!
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Produce a secure block cipher round function (1 bit round key; 7 bit message). Tags: math,encryption,...
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3 votes

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Golf Transmission As in, the 5 speed transmission from the original VW Golf GTI. Print the transmission pattern in as few bytes as possible. ...
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What programming languages have been created by CGCC users?

Morsecco Morsecco is a minimalistic, but mighty programming language using morse code for coding (hence the sparkling name). You need only a dot for the short beep, a stroke (dash or slash) for the ...
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Stairspin Given a grid, of n x n size. The elements are indexed so: 00 10 20 ... 01 11 21 ... 02 12 22 ... .. .. .. ... and so on. There is a very interesting ...
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Emulate a Turing Complete processor (As opposed to a Turing-complete processor.) In the puzzle game Turing Complete, at one stage you get to "build" a processor out of previous parts. This ...
Neil's user avatar
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2 votes

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Sub-quadratic base conversion Write a program that converts a positive integer given in base 10 to its base 2 representation. Your algorithm must run in a complexity lower that \$O(n^2)\$ Rules You ...
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Can I do this parkour? code-golf In this challenge, you'll be given a list of platforms (line segments), a start point, a goal point, and your acceleration, stopping, and jump strength. Your task ...
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I'm building a Code-Golf type game for an authorization language. The premise is to review a piece of an authorization policy and the permissions to identify the least number of rules you need to ...
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1 vote

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Add two natural numbers
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UTF-8 sum of source code. Output the sum of the UTF-8 characters codes of your source code. Draft notes Seems like there isn't that yet.. After some feedbacks I think this has nothing interesting or ...
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12 votes
Accepted

Why is the site logo a medal?

Because we're a site about competition See Adám's answer to the question asking for input on the site design, and the original proposed logo which was incorporated into the old Graduation Userscript. ...
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3 votes

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Calculate a struct size In C and C++, the size of a structure depends not only on the sizes of its members but also their alignment requirements. This problem will assume a simple case in which each ...
Neil's user avatar
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Longest irreducible quine code-bowlingquine Write an irreducible quine, i.e. a program that prints its own source code, which can't be reduced by removing characters to a shorter program with the ...
math scat's user avatar
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2 votes

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Smallest infinite irreducible program code-golf code-bowling A typical constraint for code-bowling challenges, where the goal is to make your code as long as possible, is that your program must be &...
Rydwolf Programs's user avatar
1 vote

default format for [polynomials]

The function and k The pure function doesn't give an upperbound of k so it needs extra provided Seems to trivialize some ...
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1 vote

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Twist words to intersect code-golf Given three strings of alphabetic characters \$A\$, \$B\$, and \$X\$, (all uppercase or all lowercase, your choice), output an arrangement of \$A\$ and \$B\$ on a ...
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