Activity for user
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Edit | Post #282438 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Evens or Odds - you know this one Scala `-language:postfixOps`, 2 bytes ```scala 1& ``` Try it online! 1 for odd, 0 for even. Scala, 3 bytes ```scala %2 ``` Try it online! 1 for odd, 0 for even. (more) |
— | over 3 years ago |
| Edit | Post #282319 |
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— | over 3 years ago |
| Edit | Post #282319 |
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— | over 3 years ago |
| Comment | Post #282319 |
@#53196 Whoops, didn't realize that. Off-by-one errors are the two things I hate most :P. And yes, the input will be an array and a set of indices. (more) |
— | over 3 years ago |
| Comment | Post #282319 |
@Moshi Thanks for reviewing my draft! About your first comment - that's not a mistake, the 5 is exclusive, but I'm removing that part anyway, since it won't be a contiguous subset anymore. (more) |
— | over 3 years ago |
| Edit | Post #282319 | Initial revision | — | over 3 years ago |
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Shuffle a subset of a list [FINALIZED] 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 list \$[A, B, C, D, E, F, G, H]\$ and the indices \$[0, 3, 4, 5, 7]\$ (0-indexed), you would extract th... (more) |
— | over 3 years ago |
| Edit | Post #281960 |
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— | over 3 years ago |
| Edit | Post #282249 |
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— | over 3 years ago |
| Edit | Post #282249 |
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— | over 3 years ago |
| Edit | Post #282249 | Initial revision | — | over 3 years ago |
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A: Are they abundant, deficient or perfect? 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, then abundant numbers. ``` ƛD∆K-±$";£ ƛ ; #For every n... (more) |
— | over 3 years ago |
| Edit | Post #282246 |
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— | over 3 years ago |
| Edit | Post #282246 | Initial revision | — | over 3 years ago |
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A: Are they abundant, deficient or perfect? [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 third is abundant numbers. ``` {×⍵-+/∪⍵∨¯1↓⍳⍵}¨∘⍳⊢⌸⍳ ⍳ ⍝ Make a r... (more) |
— | over 3 years ago |
| Edit | Post #282168 | Initial revision | — | over 3 years ago |
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A: Diagonalized alphabet [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 uppercase letters 13 2⍴ ⍝ Turn that into a matrix where... (more) |
— | over 3 years ago |
| Edit | Post #282081 |
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— | over 3 years ago |
| Comment | Post #282081 |
@Hakerh400 Thanks, I don't know how I missed that. (more) |
— | over 3 years ago |
| Edit | Post #282081 |
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— | over 3 years ago |
| Edit | Post #282081 |
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— | over 3 years ago |
| Edit | Post #282081 |
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— | over 3 years ago |
| Edit | Post #282081 |
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— | over 3 years ago |
| Edit | Post #282081 |
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— | over 3 years ago |
| Edit | Post #282081 | Initial revision | — | over 3 years ago |
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A: Evaluation order of an APL n-train [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. ``` -- This is a fork, so append c (monad) and b (dyad) -- and continue w... (more) |
— | over 3 years ago |
| Comment | Post #282075 |
Is it alright if we number them `n..1` instead of `1..n`? (more) |
— | over 3 years ago |
| Edit | Post #281960 | Initial revision | — | over 3 years ago |
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A: Backspace an array [JavaScript (Node.js)], 41 40 bytes Saved 1 byte thanks to Shaggy x=>x.map(e=>e?a.push(e):a.pop(),a=[])&&a Try it online! ``` x => //x is the input x.map(e=> //For every element e in x e? //If e is not 0 a.push(e) //Add it to the accumulator :a.pop(), //Other... (more) |
— | over 3 years ago |
| Comment | Post #281958 |
You can get this to [62 bytes](https://tio.run/##K6gsycjPM7YoKPr/P802JzE3KSVRoUIn0TY61ipNoyLa0CpWJ1E7uiLaIDY2M00BRKfmFKcqJEZb6RrGaoKEFCAC/wuKMvNKNNI0og10YNBUxzxWU5MLLmOoYwQUNUYTMwVCA7CMgY4FhnpjHROwjCUWk6AQKPMfAA), and probably lower with Python slice black magic. (more) |
— | over 3 years ago |
| Edit | Post #281957 |
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— | over 3 years ago |
| Edit | Post #281957 | Initial revision | — | over 3 years ago |
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A: Backspace an array Scala, 45 bytes ```scala ./:(Seq[Int]())((a,x)=>a:+x dropRight-x2+2) ``` Try it in Scastie! I couldn't find a way to use underscores in the inner function :(. Explanation on its way. ```scala //The input ./:( //Fold over it, Seq[Int]() //starting with an empty list, )( ... (more) |
— | over 3 years ago |
| Comment | Post #281721 |
Nice! You can get [71 bytes](https://tio.run/##ZVJda4MwFH33V1wCAzMCbZImfmy@7nnvIkHWuAk2Wk0fxuhv764fbS0VYszJ9Zxzc9L9@p/Wyctlbyuowo45mjZZ7l67zeYIVdsjdKS1gw7qCtzL8Z0Xb731p95N5U2@LSjuNGCbwYKbeLwdfDi@vsrB0jQAfLq@dneQgXX7jKRA6GqXfJbDYPdklKputTnp@va7Lw@kYHAHa9edPCkoZNkKbU9@gmc75KOsGySkQTD6OpS1Cxc/1184ZPAHN4... (more) |
— | over 3 years ago |
| Edit | Post #281608 |
Post edited: I'm an idiot |
— | over 3 years ago |
| Comment | Post #281608 |
@Razetime I'm an idiot, thanks! (more) |
— | over 3 years ago |
| Edit | Post #281608 |
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— | over 3 years ago |
| Edit | Post #281595 |
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— | over 3 years ago |
| Edit | Post #281608 | Initial revision | — | over 3 years ago |
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A: Juggler sequences Scala, 78 67 64 bytes Saved 3 bytes thanks to Razetime ```scala Stream.iterate()(x=>math.pow(x,x%2+.5).toInt).takeWhile(>1):+1 ``` Try it in Scastie! ``` Stream.iterate() //Make an infinite list by repeatedly applying (x=> //the following function to the input math.pow(x... (more) |
— | over 3 years ago |
| Edit | Post #281595 | Initial revision | — | over 3 years ago |
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A: Golf a FRACTRAN interpreter [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 and the fractions are taken as a table on the right. ``` {×x←⊃(2⌷⍵)(÷⍨(/⍨)0=|)⍺×1⌷⍵:x... (more) |
— | over 3 years ago |
| Comment | Post #281572 |
I don't understand how the second test case can ever terminate. Since there is a fraction 55/1 at the end and two integers produce an integer when multiplied, it would never get past that fraction. (more) |
— | over 3 years ago |
| Edit | Post #281550 | Initial revision | — | over 3 years ago |
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A: Make my number a set [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 represented with simple lists in Haskell. (more) |
— | over 3 years ago |
| Edit | Post #281536 | Initial revision | — | over 3 years ago |
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A: Make my number a set [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's extra processing code in the footer. ``` {∇¨⍳⍵} ⍵ ⍝ The input ⍳ ⍝ Mak... (more) |
— | over 3 years ago |
| Edit | Post #281498 |
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— | over 3 years ago |
| Edit | Post #281498 | Initial revision | — | over 3 years ago |