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...

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

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 8mo ago by trichoplax‭  ·  last activity 7mo ago by taoh‭

posted 9mo ago by trichoplax‭  ·  edited 8mo ago by trichoplax‭

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 9mo ago by trichoplax‭  ·  last activity 8mo ago by Shaggy‭

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 8mo ago by trichoplax‭  ·  last activity 4mo 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 8mo ago by trichoplax‭  ·  last activity 8mo 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 8mo ago by trichoplax‭  ·  last activity 6mo ago by A username‭

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 7mo ago by trichoplax‭  ·  last activity 6mo ago by Razetime‭

posted 9mo ago by trichoplax‭  ·  edited 9mo ago by trichoplax‭

I see the Sandbox as a vital part of challenge design. When I visit the Sandbox I'd like to be able to show only proposals that are not finalized, so I can focus feedback where it is needed. In th...

3 answers  ·  posted 9mo ago by trichoplax‭  ·  last activity 7mo ago by Monica Cellio‭

I'm raising this on our local Meta first, rather than the main Codidact Meta, because I don't yet have the Edit Posts ability so I can't tell what problems may exist. Hopefully some of you who have...

1 answer  ·  posted 8mo ago by trichoplax‭  ·  edited 8mo ago by trichoplax‭

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 8mo ago by trichoplax‭  ·  last activity 6mo ago by Shaggy‭

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 7mo 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...

4 answers  ·  posted 7mo ago by trichoplax‭  ·  last activity 7mo ago by steffan153‭

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 7mo ago by trichoplax‭  ·  last activity 7mo ago by torres‭