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Posts by trichoplax‭

75%
+4 −0
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...

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

Question code-golf
75%
+4 −0
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 8mo ago by trichoplax‭  ·  last activity 7mo ago by taoh‭

Question code-golf alphabet
71%
+3 −0
Sandbox Chequer checker [FINALIZED]

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

71%
+3 −0
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 7mo ago by trichoplax‭  ·  last activity 6mo ago by Razetime‭

71%
+3 −0
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 9mo ago by trichoplax‭  ·  last activity 8mo ago by Shaggy‭

71%
+3 −0
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 8mo ago by trichoplax‭  ·  last activity 4mo ago by m90‭

71%
+3 −0
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 8mo ago by trichoplax‭  ·  last activity 8mo ago by Razetime‭

Question code-golf base
71%
+3 −0
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 8mo ago by trichoplax‭  ·  last activity 6mo ago by A username‭

66%
+2 −0
Sandbox Presumptuous base conversion [FINALIZED]

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

66%
+2 −0
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 7mo ago by trichoplax‭  ·  last activity 7mo ago by torres‭

Question code-golf number
66%
+2 −0
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...

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

66%
+2 −0
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 7mo ago by trichoplax‭

Question code-golf alphabet
66%
+2 −0
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 8mo ago by trichoplax‭  ·  last activity 6mo ago by Shaggy‭

66%
+2 −0
Meta Is there a problem with the edit queues?

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

Question discussion editing
66%
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Meta Filtering the sandbox for ease of feedback

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

Question discussion sandbox
60%
+1 −0
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 8mo ago by trichoplax‭  ·  edited 8mo ago by trichoplax‭

Question code-golf quine base
60%
+1 −0
Sandbox Arbitrary angle wrapping wordsearch

posted 8mo ago by trichoplax‭  ·  edited 7mo ago by trichoplax‭

60%
+1 −0
Meta Thoughts on hiding challenge sections with expandable details tags

I've recently started experimenting with hiding some of the sections in a challenge, using an expandable <details> tag. This seems to have some advantages, but I'm interested to hear how peop...

3 answers  ·  posted 8mo ago by trichoplax‭  ·  last activity 8mo ago by celtschk‭

60%
+1 −0
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 9mo ago by trichoplax‭  ·  edited 8mo ago by trichoplax‭

60%
+1 −0
60%
+1 −0
Challenges Knight safe squares

Rust, 236 184 166 142 bytes |i:u64|{let s=0x101010101010101;let(a,b,c,d)=(i&252*s,i&254*s,i&127*s,i&63*s);(i|a<<6|b<<15|c<<17|d<<10|d>>6|c>>15|b...

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

Answer
60%
+1 −0
Sandbox Encode with ROT13.5 [FINALIZED]

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

60%
+1 −0
Sandbox Digit antitranspose [FINALIZED]

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

60%
+1 −0
Meta Filtering the sandbox for ease of feedback

I'm leaving this answer here for any votes and discussion, but I no longer hold this opinion. I've posted a longer answer to explain why I've changed my mind After hearing about the filter devel...

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

Answer
60%
+1 −0
Q&A Hosting fastest code challenges

When posting a fastest-code challenge, what do I need to bear in mind? Unlike with code-golf challenges, where the score is simply the number of bytes in the source code, for a fastest-code challe...

0 answers  ·  posted 3mo ago by trichoplax‭

Question tips fastest-code

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