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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...
The problem Someone has created an encoding format for square bit matrices, however they have found it isn't perfect! One encoding may not decode to exactly one matrix, or it may not even be possi...
^ That can be used. You can try to contact the person who posted the challenge and have them mark the answer as "React -> Invalid". Or otherwise it seems that anyone can mark an answer as inva...
Respect both sides We should consider how an approach would affect the poster of the incorrect answer, and how it would affect the posters of correct answers. Correct answers In general, allowin...
Do nothing It's wrong but well intentioned. The best we can do is leave a comment saying why its wrong.
Lock it Locking a post disallows edits, comments and votes. I am not sure if it allows the original poster to edit or not, but this would be one way to preserve the answer while preventing interac...
Recently a flag came to my attention on this post: https://codegolf.codidact.com/posts/280372/281943#answer-281943 It is a well-intentioned answer to the challenge, but unfortunately it is wrong, ...
Vyxal, 12 bytes bṠ:₍gGvc†Tİ∑ Try it Online! İ # Index into input T # Indices where v # For each Ṡ # Sum of b # Binary digits ₍gG ...
C (gcc), 36 bytes f(int*p){for(;*p;putchar(32|*p++));} Try it online! Similar solutions: 36 bytes too but with new lines: f(int*p){for(;*p;*p|=32,puts(p++));} 37 bytes using recursion:...
Python 3, 145 bytes lambda s:[dict({chr(i+c):chr((i+13)%26+c)for i in range(26)for c in(65,97)},**{chr(i+48):chr((i+5)%10+48)for i in range(10)}).get(c,c)for c in s] Try it online! Generates...
Python 3, 35 bytes lambda x:[chr(ord(i)|32)for i in x] Try it online! Performs a list comprehension on the input string; for each character it: transforms it into the ASCII character code...
J, 8 char Solution: |:|.|."1 Test example: (i. 3 3) 0 1 2 3 4 5 6 7 8 |:|.|."1 (i. 3 3) 8 5 2 7 4 1 6 3 0 (i. 4 2) 0 1 2 3 4 5 6 7 |:|.|."1 (i. 4 2) 7 5 3 1 6 4 2...
Japt, 2 bytes Input as a multi-line string ÕÔ Try it ÕÔ :Implicit input of string Õ :Transpose Ô :Reverse
Python 3, 35 bytes lambda m:list(zip(*m[::-1]))[::-1] Try it online! The format is a list of tuples. The content of the tuples could be any type; in my tests I used single-digit strings bec...
Vyxal, 12 bytes µ«,←⋎„¶ɽ₌Ż«ḟ Try it Online! Outputs as a list of characters. Sort by index in (compressed) tibdfghklpqyj.
Vyxal, 3 bytes ∩ṘR Try it Online! Transpose, reverse, reverse each.
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...
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...
Python 3, 43 bytes lambda x:sorted(x,key='tibdfghklpqyj'.find) Try it online! Sorts based on index in a sorted string. Inputs as a string and outputs as a list. -14 bytes by replacing .inde...
