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 9mo ago by trichoplax‭  ·  edited 2mo 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 7mo 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 2mo 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 1y ago by trichoplax‭  ·  last activity 1y ago by RubenVerg‭

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

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 1y ago by trichoplax‭

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...

6 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 7mo ago by xrs‭

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 11mo ago by trichoplax‭  ·  last activity 11mo 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 2mo ago by trichoplax‭  ·  edited 2mo 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 2mo ago by trichoplax‭  ·  last activity 2mo ago by celtschk‭