The Nineteenth Byte

12:00 AM

Welcome to the fourth Biweekly Mini Golf! During this event, we'll post some CMCs (Chat Mini Challenges) for you all to solve. The first one will be posted at the start, and additional ones will be added every 5 to 10 minutes. Good luck!

user isn't here rn, so I'll start with my earlier starred ones, and then user can post theirs if they arrive later

in BMG Drafts, 3 hours ago, by caird coinheringaahing

Draft: Given n, output all reduced proper fractions with n as the denominator (e.g. 3 -> 1/3, 2/3, 8 -> 1/8, 3/8, 5/8, 7/8)

in BMG Drafts, 3 hours ago, by caird coinheringaahing

Draft: Output two integers (between 1 and 100) chosen at random from 2 different distributions (e.g. one is uniform, another is exponential)

in BMG Drafts, 3 hours ago, by caird coinheringaahing

Draft: Given n, m and a flat array (of length n × m) of positive integers, output an n×m matrix of the elements

To get started :P

Adám

@cairdcoinheringaahing APL: ⍴ Try it online!

hyper-neutrino

@cairdcoinheringaahing can I just return the numerators?

caird coinheringaahing

@hyper-neutrino No, but any pair representation is fine

hyper-neutrino

RgỊ¥Ƈ,€ then, but I'm not convinced this is optimal

Bubbler

@cairdcoinheringaahing Should every possible integer appear with nonzero probability?

caird coinheringaahing

12:04 AM

@Bubbler Yes

@hyper-neutrino I have 5 bytes

@hyper-neutrino -1 byte

Adám

@cairdcoinheringaahing APL: ?,?⌊?

Bubbler

@Adám Should be (?,?⌊?)100 I think

Adám

@Bubbler Ah yes, 100 isn't a parameter.

Bubbler

which can be golfed to ⌊\?2⍴100

Adám

Indeed, I was just about to say.

Bubbler

12:07 AM

except that it makes the two variables dependent (not sure if it's allowed)

Adám

I wonder if ⌊\2?100 is acceptable.

Hm, no, then the second one can never be 100

Bubbler

The second number cannot be 100 in that case, so invalid

caird coinheringaahing

@Bubbler That's fine, so long as the distributions are provably distinct

Adám

That's for sure.

caird coinheringaahing

@Bubbler Do you want to post your first starred one?

Bubbler

12:10 AM

in BMG Drafts, 33 mins ago, by Bubbler

Draft: Recursive Z-matrix (divide the matrix into four quadrants and visit the quadrants in Z-shaped order, and do the same for inner matrices) of size 2^n for a nonnegative integer n. Output can be 0- or 1-based. (0-based examples: n=0: [[0]], n=1: [[0,1], [2,3]], n=2: [[0,1,4,5], [2,3,6,7], [8,9,12,13], [10,11,14,15]])

hyper-neutrino

does your 5b involve a shorter generation of the nuimerators or shorter pairing?

caird coinheringaahing

@hyper-neutrino I have a 3 byte way of getting the numerators

Redwolf Programs

Hi!

caird coinheringaahing

Hey Redwolf :P

Redwolf Programs

On mobile, so I can’t golf much

Adám

12:13 AM

@cairdcoinheringaahing APL: ⊢,¨∘⍸1=⊢∨⍳ Try it online!

lyxal

@RedwolfPrograms I've done bmgs from mobile. Get good.

Adám

@Bubbler Yikes.

caird coinheringaahing

@Bubbler This might be worth posting on main

Bubbler

Yeah, I figured

Adám

Yeah, def. not "mini"

VTC as off-topic. ;-)

Bubbler

12:15 AM

Okay, next one

in BMG Drafts, 35 mins ago, by Bubbler

Draft: Count bingos on a boolean 5x5 board where marked cells are true(1) and the others are false(0).

Adám

@Bubbler So count the 1s?

APL: ≢⍸

caird coinheringaahing

@lyxal Do you want to post yours as well, give us 2 to try?

Bubbler

Count all-one rows, columns, or diagonals

lyxal

in BMG Drafts, 53 mins ago, by lyxal

Draft: Given a solveable numbers game layout, output a solution that gets the target number. There may be more than one possible solution. 75, 2, 5, 6, 1, 4 — TARGET: 273 -> (75 − 6) × 4 = 276; 276 − 2 − 1 = 273

Adám

Oh. Me no speak bingo.

caird coinheringaahing

12:16 AM

@Bubbler Jelly, 10 bytes

Bubbler

@cairdcoinheringaahing How do you count the diagonals?

caird coinheringaahing

@lyxal Are we only allowed to use the 4-button operators (+,-,*,/)?

@Bubbler Trace (Æṭ)

lyxal

@cairdcoinheringaahing Correct

No decimals or negative numbers either

Bubbler

@cairdcoinheringaahing Oh, so it's the trace in linear algebra sense

caird coinheringaahing

Æṭ vectorises at depth 2 (IIRC) meaning it vectorises over lists of matrices, but still applies as it should to normal matrices, so I pair with the reverses (moves the anti-main to the main) and get the trace of each

@Bubbler Yep

lyxal

12:19 AM

Note: you don't have to use all the numbers: 100, 25, 6, 5, 9, 10 (TARGET: 101) -> 100 + 6 - 5 is valid

Redwolf Programs

I’m on one of my parents’ iPhones and golfing on it is way too painful lol

I can’t find a backtick

lyxal

@RedwolfPrograms pathetic

@RedwolfPrograms `

Bubbler

@RedwolfPrograms No Hacker's Keyboard? :P

caird coinheringaahing

@RedwolfPrograms Hold down on the apostrophe :P

user

Darn, I missed the BMG :(

caird coinheringaahing

12:21 AM

We're in the middle of it :P

user

That's the third event I've missed today

Oh yay

caird coinheringaahing

Feel free to post a couple of your drafts

user

in BMG Drafts, 3 hours ago, by user

Draft: Alternate between printing two distinct numbers forever

Adám

@user Any numbers of our choice?

user

Pretty boring but ¯\_(ツ)_/¯

@Adám Yep

Bubbler

12:23 AM

@user {⎕←-⍵}⍣≡1

caird coinheringaahing

@lyxal ಠ_ಠ I want to brute force it, but the operators map it annoying :/

Adám

@user →×⎕←?2 Try it online!

user

@user Scala, kinda a port of Bubbler's: Stream.iterate(1)(-_)foreach println

caird coinheringaahing

@user Jelly, 3 bytes

Redwolf Programs

Ugh unreliable connection so I lost my answer to a CMC

Adám

12:24 AM

No, wait, I was printing a random one of them.

user

@Adám I'm not sure that counts as alternating, but it's a CMC, so ¯\_(ツ)_/¯

caird coinheringaahing

I feel like 2 bytes is possible, but I don't think it is. We need Ṅ (or Ȯ) to output, one byte to loop and one byte to modify it

Redwolf Programs

I’ll be back at my hotel in an hour or so, I’ll wait until then to attempt this :p

Adám

@Bubbler Alternative of same length: -⍣{≡⎕←⍵}1

user

@Adám Does that go to line 1? (→×)?

Adám

12:27 AM

Yes.

lyxal

@user if generators weren't so bad, I'd have two bytes in Vyxal: Try it Online!

user

@lyxal What's the problem there?

caird coinheringaahing

@lyxal How does that work?

Bit of each natural number?

Bubbler

05AB1E might have two byter for that

but apparently no 05AB1E-ers are here :P

Adám

Ooh, fun APL solution:

→⎕←2
→⎕←1

lyxal

12:29 AM

@cairdcoinheringaahing infinite list, % 2 == 0

Except the vectorising seems broken

user

I bags this PR

caird coinheringaahing

Husk should have 2 bytes

user

I thought it'd be 3

Oh wait, there's an infinite sequence

caird coinheringaahing

@user 05AB1E, 2 bytes ∞È

Assuming that format is allowed

user

It is, and even if it wasn't, it's a CMC, so anything goes :P

Bubbler

12:30 AM

Nice

user

@cairdcoinheringaahing All hail builtins: İ¬

Adám

MCMG: How long does the event last?

caird coinheringaahing

It doesn't appear to have a single byte mod-by-2 builtin :/

@Adám Until we run out of drafts/cmcs

user

As long as you want it to

Bubbler

@Adám It is planned for 90 mins, but we're running out of drafts pretty fast now

lyxal

12:33 AM

@Adám We have all day to play countdown (the numbers game) :p

Adám

I should probably think of going to bed. 1:30 here…

Bubbler

in BMG Drafts, 47 mins ago, by Bubbler

Draft: Given an array of positive integers having length 3n+2, compute its "sum-and-skip" transform: [1, 2, 3, 4, 5, 6, 7, 8] -> [1+2, 3, 4+5, 6, 7+8] = [3, 3, 9, 6, 15]

caird coinheringaahing

Same :/

user

@user Husk, 3 bytes: ¡¬1

lyxal

@Adám does that mean you're in the UK?

Adám

12:34 AM

Ugh, 3n +2

@lyxal Yes. You didn't see the map?

lyxal

@Adám nice. Have you ever watched Countdown on channel 4?

Adám

I don't watch TV.

lyxal

Ah

caird coinheringaahing

@Bubbler Jelly, ~~7 bytes~~ 8 bytes :P

Bubbler

@cairdcoinheringaahing I don't think so

caird coinheringaahing

12:39 AM

I feel like there's a shorter version tho

Bubbler

Ooh, nice use of mold

Adám

There's got to be a better way than this abomination: ¯1↓2↓,{2 ¯1+/⍤↑¨⊂⍵}⌺(⍪3 3)⊢0 0,⎕

caird coinheringaahing

6 bytes :D

Adám

Oh, I got one.

@Bubbler +/¨⊢⊂⍨≢⍴1 0 1⍨ Try it online!

caird coinheringaahing

in BMG Drafts, 3 hours ago, by caird coinheringaahing

Draft: Given a binary function and a single argument, return a function which takes a single argument and applies the binary function to both provided arguments

Didn't realise I had one left I hadn't posted :P

Adám

12:43 AM

I don't understand.

lyxal

@cairdcoinheringaahing applies the binary function to the binary function?

caird coinheringaahing

Partial application of a provided binary function

Adám

If the function I return takes a single argument, how can it apply a binary function to two args?

lyxal

^

Adám

Oh, that's ∘ in APL?

caird coinheringaahing

12:44 AM

@Adám Because it's already been provided with the first argument

e.g. if you're passed f and 3, you return the partial function f(3)

Bubbler

I think it means lambda f,x:lambda y:f(x,y)

Adám

Right, so in APL, +∘1 returns an increment function and ÷∘2 returns a halve function.

Bubbler

which means ∘ in APL and & in J

Haskell one should be curry I think

caird coinheringaahing

Doesn't Haskell curry by default, so $ (function application) should work no?

Adám

dzaima/APL: ∘ Try it online!

Bubbler

12:48 AM

If it's OK, then $ should be ($), and id is shorter

Adám

In Dyalog, it'd be awkward: {⍺⍺∘⍵⍵} (or ⎕∘⎕ which would technically do the job, but it would be very hard, though not impossible, to use it).

caird coinheringaahing

I think this works for Jelly

Unless the input has multiple chains ಠ_ಠ

Adám

@cairdcoinheringaahing That's pronounced like the Danish word for "Jew"

caird coinheringaahing

@cairdcoinheringaahing Works without chains, also for 6 bytes :P

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caird coinheringaahing

12:55 AM

> Your code-golf badge usually lets you single-handedly close code-golf questions as duplicates and reopen them. However, since you participated in editing this question's tags, this privilege doesn't apply this time.

Really?

Someone with a hammer please hammer that as a dupe of this

Bubbler

Done.

So... the event is over?

caird coinheringaahing

There is one last draft:

in BMG Drafts, 4 hours ago, by user

Draft: Rickroll someone. Standard loopholes allowed and encouraged :P

Bubbler

Lol :P

caird coinheringaahing

But beyond that, yeah, I think we can call it. Feel free y'all to keep trying the challenges if you want some more practice, don't let the fact this is "over" discourage you from replying. Thanks y'all for attending, hope it was fun!

Adám

Try it online!

caird coinheringaahing

12:59 AM

...why did I just click that without thinking?

Adám

Wait, really‽

Bubbler

That was a really good prank

OldSandboxPosts

Sandbox posts last active a week ago: NP-complete reduction: grid-Hamiltonian circuit [code-golf] [open-ended-function] [graph-theory] [restricted-complexity]

caird coinheringaahing

"CMC: Rickroll people"
*someone posts a link, rickrolls me*
Me: *surprised pikachu face*

@Adám Yes, I'm ashamed of myself :/

Adám

Much Rick, very roll. Wow.

This was fun. ○/

caird coinheringaahing

1:03 AM

\o I should probably sleep as well

Sandbox Posts

1:17 AM

0

A: Sandbox for Proposed Challenges

Recursive Z-matrix code-golf array-manipulation matrix Originally from a CMC I proposed for the last BMG event Challenge Given a non-negative integer \$n\$, create a 2D array of size \$2^n × 2^n\$ which is generated in the following manner: Divide the matrix into four quadrants of size \$2^{n-1}...

Redwolf Programs

2:01 AM

I'm back

Missed the rest of BMG :/

I did manage to pet a cute cat though

Looks like BMG went well

I'll try a few CMCs in JS

Bubbler

Not very well though, it ran out of CMCs rather quickly without many solutions

Redwolf Programs

2:16 AM

@Bubbler JS, 50: x=>x.map((n,i)=>r.push(i%3-1?n:r.pop()+n),r=[])&&r

One letter variable names are surprisingly readable if you're consistent with what letters mean what

Bubbler

> consistent with what letters mean what

That's what golflangs do I guess :P

caird coinheringaahing

Time to make a golf lang where reusing a letter changes its meaning :P

actually...

It wouldn't be a great golf language, but it could be an interesting esolang, where reusing a command changes its meaning

Bubbler

It's easy: encode the source like Malbolge :P

Redwolf Programs

Even worse would be changing the parsing rules after every usage :p

caird coinheringaahing

No, meaningfully change its meaning :P

Redwolf Programs

2:28 AM

(And even more worse, make it change the parsing rules each time, even during loops :p :p)

caird coinheringaahing

I think I've just got some more ideas for Hatred :P

Bubbler

I was thinking of a name of such an esolang, and came up with Shapeshifter, but it's already taken :/

caird coinheringaahing

Isn't Shapeshifter what Changeling compiles to?

Bubbler

Yeah, something like that

Cursed idea: Brainfuck but + alternates between + and > and - does between - and <

Redwolf Programs

Would that be TC?

Opinions on SO's new collectives?

Razetime

2:42 AM

@RedwolfPrograms it's deterministically defined

sounds possible

hyper-neutrino

@RedwolfPrograms i had a conversation about it in the codidact communities discord but i'll copy a summary of a few of my opinions about it

> giving corporations control over SO content probably goes against the whole "community moderation" idea and... I don't personally like it

> but yeah giving content control / moderation to anyone that hasn't established themselves within the community (even if the rep system isn't perfect / great, it mostly works) especially a huge corporation is... a concerning precedent

caird coinheringaahing

@RedwolfPrograms That was at +29 earlier today

Honestly, it looks like the only change is the ability for companies to say "See user X? They work for us, and so if they answer a question about our product Y, it should be marked as an 'official' answer"

hyper-neutrino

and it feels like another prioritization of corporate profits over the community, and I understand the need to generate revenue, but also it was only privately discussed with a few community people under NDA and so it feels not great

it feels like they just used "here we asked some people" as a seal of "shut up and don't complain about community concensus or opinion"

caird coinheringaahing

The actual problem comes from the legal-ese side and the corporate approach, rather than what it actually does

hyper-neutrino

definitely

Redwolf Programs

2:53 AM

I kind of like the idea behind collectives, but not bringing important things like this up with the community first is concerning

hyper-neutrino

honestly I oppose the principle of allowing corporations authority over content moderation

caird coinheringaahing

As soon as the reason for not discussing it first is "We had to protect corporate interests", you know some shady shit is going on

hyper-neutrino

especially retroactively - everything under a crap ton of google tags is now to some extent controlled by Google, even things from the past

caird coinheringaahing

@hyper-neutrino It appears as though moderation will be largely unaffected, aside from a greater workload on the SO mods

Redwolf Programs

Well, I like the idea of having spaces where questions about certain technologies can be grouped together and top answers can be listed, but not the corporate-controlled part

hyper-neutrino

2:56 AM

@cairdcoinheringaahing oh, really? I mean, I'm not too sure what the "participating organizations has authority over the content in the collective's tags" exactly entails

Redwolf Programs

Having something like collectives, but where the community would vote on which tags are grouped together, would be cool.

hyper-neutrino

i also don't know what sort of highlighting organizations can do - i hope they don't get to pin answers to the top

heh, the last few questions in the Go Language collective have all been bad

caird coinheringaahing

The Admins and Recognised Users and what not are just "labels" as far as I can tell. It's a bit like a verified tick on Instagram or Twitter in that it tells you "This user actually does know about this". Of course, SE isn't supposed to be user-focused, and reputation/tag badges already do that, but

hyper-neutrino

out of the past like 50 newest there are only like 5 positively scored and another handful of 0-score questions

Redwolf Programs

Something sort of like an Area 51 for collectives would be neat. Like I could propose a JS collective, and it'd show new questions, answers, and top answerers in the group of tags. Maybe even mark the top answerers in some way.

But having an external party control it is kinda concerning

caird coinheringaahing

2:58 AM

It's a way for them to make money

hyper-neutrino

wait how did the recent challenge get closed by bubbler but not caird

oh, the op didn't tag it properly. right :/

Redwolf Programs

@cairdcoinheringaahing True. I wish they could come up with ways that don't involve messing with the existing site :/

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