trichoplax‭

Given a string of Roman numerals, decide whether it forms a valid Roman number. If not, output the substring that proves this, from the list of 50 strings described below. Relevant fact This chal...

7 answers  ·  posted 1y ago by trichoplax‭  ·  edited 8mo ago by trichoplax‭

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 2y ago by trichoplax‭  ·  last activity 12mo ago by trichoplax‭

Sandbox votes should give no reputation I believe this is already the case, but for completeness: I agree that neither upvotes nor downvotes on Sandbox posts should affect reputation. Although I...

posted 7mo ago by trichoplax‭

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 2y ago by trichoplax‭  ·  last activity 1y ago by Karl Knechtel‭

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 2y ago by trichoplax‭  ·  last activity 2y ago by taoh‭

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 2y ago by trichoplax‭  ·  last activity 2y ago by Razetime‭

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 2y ago by trichoplax‭  ·  last activity 2y ago by RubenVerg‭

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 2y ago by trichoplax‭  ·  last activity 2y ago by m90‭

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 2y ago by trichoplax‭  ·  last activity 2y ago by Razetime‭

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 2y ago by trichoplax‭  ·  last activity 2y ago by emanresu A‭

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 2y ago by trichoplax‭  ·  edited 2y ago by trichoplax‭

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 2y ago by trichoplax‭  ·  last activity 2y ago by Taeir‭

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 1y ago by trichoplax‭  ·  last activity 1y ago by Razetime‭

Start afresh but keep history When migrating to the Challenges category, there are several aspects of the post that could be included or discarded: Comments Edit history Votes Comments Th...

posted 7mo ago by trichoplax‭  ·  edited 7mo ago by trichoplax‭

A King of the Hill contest requires that a controller program provided by the person hosting the contest communicate (both input and output) with each of the entries to the contest. For some contes...

1 answer  ·  posted 7mo ago by trichoplax‭  ·  last activity 7mo ago by celtschk‭