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 12mo ago by trichoplax‭  ·  last activity 19d 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 12mo ago by trichoplax‭  ·  last activity 11mo 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 11mo ago by trichoplax‭  ·  last activity 10mo 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 3mo ago by trichoplax‭  ·  last activity 3mo ago by RubenVerg‭

posted 1y ago by trichoplax‭  ·  edited 1y 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 1y ago by trichoplax‭  ·  last activity 11mo ago by Monica Cellio‭

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

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 12mo ago by trichoplax‭  ·  last activity 7mo 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 12mo ago by trichoplax‭  ·  last activity 12mo 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 12mo ago by trichoplax‭  ·  last activity 9mo ago by A username‭

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 12mo ago by trichoplax‭  ·  edited 2mo 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 11mo ago by trichoplax‭  ·  last activity 2mo ago by Taeir‭

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 3mo ago by trichoplax‭  ·  last activity 2mo ago by RubenVerg‭

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 11mo ago by trichoplax‭

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 11mo ago by trichoplax‭  ·  last activity 3mo ago by WheatWizard‭