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Scala 3, 80 bytes @main def m={val s="@main def m={val s=%c%s%1$c;printf(s,34,s)}";printf(s,34,s)} Try it in Scastie! The printf replaces %c and %1$c in string s with the quote character (34 i...
Haskell, 51 31 bytes Saved 20 bytes thanks to Hakerh400! data S=S[S] f i=S$map f[0..i-1] Try it online! S is a recursive data structure, because sets of varying element types can't be repr...
Scala, 45 bytes _./:(Seq[Int]())((a,x)=>a:+x dropRight-x*2+2) Try it in Scastie! I couldn't find a way to use underscores in the inner function :(. Explanation on its way. _ //The inp...
Scala, 15 bytes '#'.toFloat/'F' Try it in Scastie! Characters in Scala kinda get casted to integers. This is usually annoying, but it's useful when golfing. # is 35 and F is 70, and the .toFlo...
APL (Dyalog Unicode), 11 7 bytes (SBCS) Razetime and rak1507 came up with 7 byte equivalents of my original dfn (this one's rak1507's). See their solutions below. +/¨⊢=,\ Try it online! +/¨...
Scala 3, 553 bytes package a import E.Z as Z import E.* sealed trait T open class Y{export E.Z as Q} enum E[+A]derives CanEqual: case Z end E private abstract final class X extends AnyRef...
Vyxal, 24 bytes \.€hEb:L8-0wẋf$J0ḟkA5Ẏ$i Try it Online! This is absolutely abysmal but whatever. A lot of bytes are taken up by trying to pad the list with zeroes (ẋ was buggy or something so ...
Abuse anonymous classes Warning: This only works in very specific circumstances, and I've never actually needed it. Instead of defining a method outside of your method, you can make an instance o...
Abuse the C-like array syntax If you ever have to declare two variables, one of type X and the other of type X[], instead of two statements, you can declare them together using this atrocious synt...
Scala, 60 bytes _.map(_ map "".+).reduce(_.zipAll(_,"","")map(_+_)).mkString Try it in Scastie! First, _.map(_ map "".+) turns every string into a list of strings containing a single character...
Python 3, 46 bytes Saved 8 bytes thanks to Shaggy! lambda n:[n-i*i or exit(1)for i in range(1+n)] Try it online! Python 3.8 (pre-release), 50 54 52 bytes Fixed a silly mistake thanks to Sh...
Scala, 64 bytes c=>_.sortBy(x=>c.map(_(x)))(math.Ordering.Implicits.seqOrdering) Try it in Scastie! A rather crude answer, but I'll come back later to golf it. It's rather simple, though...
Scala, 130 125 bytes Saved 5 bytes by returning 1 like Hakerh400's great answer def f(m:Seq[Seq[Double]]):Double=if(m.size<1)1 else(m.indices:\.0){(i,a)=>m(0)(i)*f(m.tail.map(r=>r.take(i...
Scala, 90 89 88 bytes Saved 2 bytes thanks to Shaggy n=>1 to n map{x=>val s=if(x<2)"╔╦╗"else if(x<n)"╠╬╣"else"╚╩╝";s(0)+(""+s(1))*(n-3)+s(2)} Try it in Scastie! I feel like there'...
Python 3, 46 bytes f=lambda p,x,a=0:p and f(p[1:],x,a*x+p[0])or a Try it online! Takes input reversed.
Scala, 242 bytes _=>99 to(1,-1)map{b=>s"${w(b)} on the wall, ${w(b)}. \n${if(b>1)"Take one down and pass it around"else "Go to the store and buy some more"}, ${w((b+97)%99+1)} on the w...
Scala, 98 83 bytes Saved 15 bytes thanks to Shaggy! a=>t=>{val w=a.map(_.size).max (" "*(w-t.size>>1)+t)+:a:+" "*(w/2-5)+"BOTTOM TEXT"} Try it online! a is the ASCII art, t is th...
Cracks Mark Giraffe's answer: Forth (gforth) .( Cops and Robbers) Try it online!
APL (Dyalog Unicode), 31 bytes ⎕←↑(14↑(2⌷x),⍨⌽)¨,\1⌷x←⍉13 2⍴⎕A Try it online! Lot worse than the BQN answer. ⎕←↑(14↑(2⌷x),⍨⌽)¨,\1⌷x←⍉13 2⍴⎕A ⎕A ⍝ String of up...
Haskell, 52 48 45 42 bytes Caught mistake thanks to rak1507 Saved 3 bytes thanks to Hakerh400 f n=n:g[n-1,n-2..1] g(b:c:t)=c:b:g t g t=t Try it online! g takes the rest of the trains. -...
Scala, 83 bytes x=>x.init#::Stream.iterate(x)(x=>x++(x,x.tail).zipped.map(_-_))indexWhere(_.last<1) Try it online! Takes input as a list of two numbers. The fact that the length can...
Scala 3, 68 bytes _.zipWithIndex.flatMap(_.zipWithIndex.filter(_._1)map(_._2)map _.->) Try it in Scastie! Takes a List[List[Boolean]], returns a List[(Int, Int)]. This abuses underscores a ...
APL(Dyalog Unicode), 34 29 bytes SBCS Saved 5 bytes thanks to Razetime! {2>s←⌈2÷⍨≢⍵:⍵⋄,⍉↑∇¨s(↑,⍥⊂↓)⍵} Try it on APLgolf! {2>s←⌈2÷⍨≢⍵:⍵⋄,⍉↑∇¨s(↑,⍥⊂↓)⍵} { } ...
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