Posts by user
Task I often need to find the factorial of a number or the sum of all numbers up to a number when cheating on math tests. To help me with this, your task is to write $F$, a generalized version of ...
Task I often need to find the factorial of a number or the sum of all numbers up to a number when cheating on math tests. To help me with this, your task is to write $F$, a generalized version of ...
Idea shamelessly stolen from caird and rak1507 Shuffle a subset of a list of unique, positive integers with uniform randomness, given the indices of that subset. For example, given the list $[A, B...
APL (Dyalog Unicode), 33 bytes {×x←⊃(2⌷⍵)(÷⍨(/⍨)0=|)⍺×1⌷⍵:x∇⍵⋄⍺} Try it online! The first case doesn't work because it gets really big, but the other two do. The input is taken on the left a...
Scala, 119 bytes Saved 26 bytes after porting Moshi's solution! _ sortBy("y gree br sc bla oc pe rub ol v f li go ch m cre c s ro a l ru g pu w p o b"split " "indexWhere _.startsWith) Original...
Instead of the code-golf-tips tag, could we tag "Tips for golfing" questions with tips and code-golf instead? They can still be searched for, so I don't see a reason to make a special tag to repres...
Scala, 78 67 64 bytes Saved 3 bytes thanks to Razetime Stream.iterate(_)(x=>math.pow(x,x%2+.5).toInt).takeWhile(_>1):+1 Try it in Scastie! Stream.iterate(_) //Make an infinite list by r...
Scala, 52 bytes Stream.from(1).filter(x=>x%(x+"":\0)(_+_-48)<1).take Try it in Scastie! Woo, 3 deprecation warnings! (okay, one of them could be fixed but I like to live dangerously) St...
I think "Dangerous" could perhaps stay on. "Outdated" would probably be better off replaced with "Invalid" or something of that sort. I don't think we need "Works for me" or an analog of it at all:...
Answering with languages newer than the challenge should absolutely be allowed Most of the time, when a language is newer than a challenge, it's just a coincidence. By not allowing people to answe...
Scala 3 and Python 3.8 (pre-release), 2 languages (385 bytes) def String():Any=0 def Int():Any=0 def f(s:String):Any=print(s.replace(chr(81),chr(34)*3+s+chr(34)*3)) class M: f("""def Strin...
Scala -language:postfixOps, 2 bytes 1& Try it online! 1 for odd, 0 for even. Scala, 3 bytes _%2 Try it online! 1 for odd, 0 for even.
Vyxal, 30 28 25 bytes Saved 1 4 bytes thanks to Aaron Miller ƛ∆K-±";£kɽƛ¥D„£_'t¥=;vṪ,£ Try it Online! A rather pitiful answer, but hey, it works. Gives deficient numbers, then perfect numbers...
APL (Dyalog Unicode), 21 bytes {×⍵-+/∪⍵∨¯1↓⍳⍵}¨∘⍳⊢⌸⍳ Try it online! Returns a matrix (padded with zeroes) where the first row is deficient numbers, the second is perfect numbers, and the thi...
APL (ngn/apl), 6 bytes {∇¨⍳⍵} Try it online! Dyalog APL and dzaima/APL appear to not give empty vectors for ⍳0, so I used ngn/APL. I don't know how to turn on boxing there, though, so there'...
Scala (-language:postfixOps), 4 solutions 1. Just 256: 256 2. Casting a character: +'Ā' The character Ā is 256 in decimal, and the unary + turns it into an Int. 3. Hashcode of a string: ...
Scala, 55 bytes (Stream from 1 map 1.0./scanLeft.0)(_+_)indexWhere _.<= Try it online! Written in a more sane manner: n => Stream.from(1).map(1.0/_).scanLeft(0.0)(_+_).indexWhere(_ &g...
Scala, 41 bytes x=>2 to x forall(d=>x%d+math.sqrt(d)%1>0) Try it online! Pretty straightforward
Vyxal, 24 bytes \.€hEb:L8-0wẋf$J0ḟkA5Ẏ$i Try it Online! This is absolutely abysmal but whatever. A lot of bytes are taken up by trying to pad the list with zeroes (ẋ was buggy or something so ...
Python 3.8 (pre-release), 106 95 bytes Saved 11 bytes thanks to Peter Taylor! f=lambda m:sum((-1)**i*x*f([r[:i]+r[i+1:]for r in m[1:]])for i,x in enumerate(m[0]))if m else 1 Try it online! ...
It looks like we don't have a simple factorial challenge yet, so here's one. Task Given a non-negative number, output the factorial of that number ($n!$). The factorial of a number can be defined...
Prolog (SWI), 42 bytes R-S:-S is R*R;R<S,M is R+1,M-S. f(S):-0-S. Try it online!
Japt, 6 3 bytes Cut in half thanks to Shaggy! ¬v1 Try it online! Golfed thanks to Shaggy's interpreter auto-golf feature. ¬v1 ¬ //Square root v1 //Is that an integer?
Japt, 3 bytes ÆßX Try it online! (don't mind the -Q This is Shaggy's solution. ÆßX Æ Make a range [0, input) and map each number X: ß Run this program again on X Japt, 11 8 bytes ...
Posted Idea shamelessly stolen from caird and rak1507 Shuffle a subset of a list of unique, positive integers with uniform randomness, given the indices of that subset. For example, given the lis...
