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26 posts
 
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Challenges 55 fruit salad: choose your own Kolmogorov complexity

This is a fixed output challenge. It is similar to a standard Kolmogorov complexity challenge, except you get to choose your own fixed output. Given no input, output 55 fruits. You may choose any 5...

5 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 5mo ago by trichoplax‭

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Challenges Knight safe squares

Given a chess board with some knights on it, say how many squares are neither attacked by a knight nor containing a knight. Input An 8 by 8 grid where each square is either a knight or empty T...

3 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 6mo ago by Karl Knechtel‭

Question code-golf
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Challenges Probability of rolling all 6 dice faces

The probability of rolling every number from 1 to 6 with $N$ six-sided dice. Input A positive integer $N$. Your code must work for inputs up to and including 10, but may crash, error, or give ...

4 answers  ·  posted 8mo ago by trichoplax‭  ·  last activity 8mo ago by RubenVerg‭

Question code-golf math dice
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Challenges Just the vowels please

Given a sequence of letters, output only the vowels. Input A sequence of letters This may be a string or any ordered data structure of characters (provided it is consistent between inputs) Th...

9 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 1y ago by taoh‭

Question code-golf alphabet
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Challenges Encode with ROT13.5

Given a string, convert all of its letters using ROT13, and all of its digits using ROT5. This is sometimes referred to as ROT13.5. Input A sequence of printable ASCII characters (character cod...

4 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 1y ago by Razetime‭

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Challenges 8 coexisting queens

This is a fixed output challenge. Output a textual representation of a chessboard hosting 8 queens, none of which are attacking each other. There are 92 ways of arranging them, 12 if rotations and...

5 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 1y ago by m90‭

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Challenges The holeyest base

Given a positive integer as input, indicate which base from 2 to 16 gives the most holes in the representation of the input in that base. The digits used are 0123456789ABCDEF. Note that these incl...

6 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 1y ago by Razetime‭

Question code-golf base
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Challenges Mediocre pop count

Given a sequence of letters, omit those with the highest or lowest pop count. Terminology The pop count or population count of a binary string is the number of 1s in it. For this challenge, the ...

6 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 1y ago by A username‭

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Challenges Lowercase, but not just the letters

Given a string of printable ASCII characters, convert them all to lowercase, except not just the letters. ASCII characters that are letters have a bit in their binary representation that is 0 for ...

7 answers  ·  posted 1y ago by trichoplax‭  ·  edited 7mo ago by trichoplax‭

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Challenges Presumptuous base conversion

Take an input string representing a number and convert it to decimal (base 10). However, the base of the input is not specified. Assume the input is in the smallest base for which its digits are va...

5 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 1y ago by Shaggy‭

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Challenges Label a hinged tetromino

Given a hinged tetromino, give it a unique, consistent label independent of location, rotation, and reflection. Tetrominoes A tetromino is a connected subset of the square tiling, composed of 4 s...

2 answers  ·  posted 8mo ago by trichoplax‭  ·  last activity 7mo ago by RubenVerg‭

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Challenges Sort letters by height

Given a sequence of lower case letters, sort them into order of height. Heights The heights of letters are dependent on font, so for this challenge the height order to be used is as defined below...

5 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 7mo ago by Taeir‭

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Challenges Plain black webpage

This is a language specific challenge, for HTML only. Your answer is the content of a self contained HTML file, that when opened in a web browser gives a plain black page. Requirements The HTM...

4 answers  ·  posted 1mo ago by trichoplax‭  ·  last activity 1mo ago by Razetime‭

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Challenges Pinwheel ​words

Given a word that can be rotated by 180 degrees (a half turn) about at least one of its 3 axes and continue to be composed of English alphabet letters, output one of its rotated forms. The 3 rotat...

0 answers  ·  posted 1y ago by trichoplax‭

Question code-golf alphabet
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Challenges Single digit Roman numeral

Given a single character, which is a valid Roman numeral, output its value. Values There are 7 valid single character Roman numerals, with the following values: Character Value I...

5 answers  ·  posted 5mo ago by trichoplax‭  ·  last activity 4mo ago by H_H‭

Question code-golf
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Challenges Borromean coprimes

Given 3 positive integers, indicate whether they are Borromean coprimes. Definition 3 positive integers are called Borromean coprimes if both of the following are true: Their greatest common d...

2 answers  ·  posted 5mo ago by trichoplax‭  ·  last activity 3mo ago by NikNakk‭

Question code-golf math
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Challenges Expected value of highest dice rolled

You roll $N$ six-sided dice simultaneously. Your score is the highest number rolled. If you play this game many times, what is the expected value (mean) of your score? Input A positive integer ...

2 answers  ·  posted 8mo ago by trichoplax‭  ·  last activity 8mo ago by RubenVerg‭

Question code-golf math dice
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Challenges Digit antitranspose

Convert a matrix or grid of digits to its antitranspose. For a square matrix , this is its reflection in its antidiagonal. More generally, for a rectangular matrix, this is its reflection in its sk...

4 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 1y ago by torres‭

Question code-golf number
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Challenges Connect the corners without 4 in a row

Connect opposite corners of a rectangle of characters without putting 4 characters in a row. Input Two numbers, W and H, representing the width and height of the rectangle Each number will be ...

1 answer  ·  posted 1y ago by trichoplax‭  ·  last activity 8mo ago by WheatWizard‭

Question code-golf
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Challenges Balanced quinary quasiquine

Given an integer $N$ in balanced quinary, output the first $N$ characters of your source code if $N$ is positive, or the last $-N$ characters of your source code if $N$ is negative. Terminology ...

1 answer  ·  posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

Question code-golf quine base
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Challenges Word suggesting

Suggest a word from a word list, given a string. Motivation Imagine typing a word one letter at a time, and seeing a suggested word after each letter is typed. At first the suggested word is simp...

0 answers  ·  posted 6mo ago by trichoplax‭

Question code-golf string list
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Challenges Chequer checker

A chequer board (also spelt "checker board" in some places) is an 8 by 8 grid of squares alternating between 2 colours. Check whether a provided pattern could be a region of a chequer board. The c...

1 answer  ·  posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

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Challenges Shortest representation in generalised Roman numerals

Find the shortest representation of an integer in generalised Roman numerals. Since there is more than one way to generalise, only the following definition applies to this challenge. Definition T...

1 answer  ·  posted 5mo ago by trichoplax‭  ·  last activity 3mo ago by NikNakk‭

Question code-golf number
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Challenges Fibonacci without consecutive digits

Output the Nth number in the list of Fibonacci numbers that have no consecutive digits. Input A non-negative integer. Output The Nth number in the list of Fibonacci numbers whose base 10 ...

0 answers  ·  posted 7d ago by trichoplax‭

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Challenges Circle of text characters

Given a radius R, output a text representation of a circle. Input A positive integer R (strictly greater than zero) You do not need to handle values of R greater than 32 Output A square ...

0 answers  ·  posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

Question code-golf string