Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »

Posts by trichoplax‭

100 posts
83%
+8 −0
Challenges The 50 substrings that validate any string of Roman numerals

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 8mo ago by trichoplax‭  ·  edited 25d ago by trichoplax‭

77%
+5 −0
Challenges 55 fruit salad: choose your own Kolmogorov complexity

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 5mo ago by trichoplax‭

75%
+4 −0
Meta Category migration and the sandbox

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 18d ago by trichoplax‭

Answer
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...

3 answers  ·  posted 2y ago by trichoplax‭  ·  last activity 1y ago by Karl Knechtel‭

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

Question code-golf alphabet
75%
+4 −0
Challenges Probability of rolling all 6 dice faces

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

Question code-golf math dice
75%
+4 −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 2y ago by trichoplax‭  ·  last activity 2y ago by Razetime‭

71%
+3 −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...

5 answers  ·  posted 2y ago by trichoplax‭  ·  last activity 1y ago by Taeir‭

71%
+3 −0
Q&A Advice for hosting a language agnostic King of the Hill contest

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 9d ago by trichoplax‭  ·  last activity 8d ago by celtschk‭

Question king-of-the-hill
71%
+3 −0
Challenges Plain black webpage

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 10mo ago by trichoplax‭  ·  last activity 10mo ago by Razetime‭

71%
+3 −0
Challenges Single digit Roman numeral

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 6mo ago by xrs‭

Question code-golf
71%
+3 −0
Challenges Label a hinged tetromino

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

71%
+3 −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...

1 answer  ·  posted 1y ago by trichoplax‭  ·  last activity 3mo ago by Lundin‭

Question tips fastest-code
71%
+3 −0
Sandbox Chequer checker [FINALIZED]

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

71%
+3 −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 2y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

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

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

Question code-golf base
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 2y ago by trichoplax‭  ·  last activity 1y ago by m90‭

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

71%
+3 −0
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 2y ago by trichoplax‭  ·  last activity 2y ago by Monica Cellio‭

Question discussion sandbox
66%
+2 −0
Challenges Connect the corners without 4 in a row

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 2y ago by trichoplax‭  ·  last activity 1y ago by WheatWizard‭

Question code-golf
66%
+2 −0
66%
+2 −0
Challenges Expected value of highest dice rolled

You roll $N$ six-sided dice simultaneously. Your score is the highest number rolled. If you play this game many times, what is the expected value (mean) of your score? Input A positive integer ...

2 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 1y ago by RubenVerg‭

Question code-golf math dice
66%
+2 −0
Challenges Borromean coprimes

Given 3 positive integers, indicate whether they are Borromean coprimes. Definition 3 positive integers are called Borromean coprimes if both of the following are true: Their greatest common d...

2 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 11mo ago by NikNakk‭

Question code-golf math
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 2y ago by trichoplax‭  ·  edited 2y ago by trichoplax‭

Question discussion editing