The Nineteenth Byte

Bubbler

4:00 AM

@att Then half of learning Sledgehammer is knowing how to invoke the compressor, and the other half is doing (more-or-less) atomic-code-golf in Mathematica

lyxal

@hyper-neutrino laughs in experimental branch giving them useful ascii art overloads

caird coinheringaahing

Or f(f(x, g(x)), f(y, g(y))). In fact: CMC: given black box binary function f and unary function g, along with two integers x, y, output f(f(x, g(x)), f(y, g(y))). Functions take and return integers

Bubbler

@cairdcoinheringaahing J: 2 :'u&(u v)'

Redwolf Programs

@cairdcoinheringaahing JS: (f,g,x,y)=>f(f(x,g(x)),f(y,g(y))) :p

att

@Bubbler I suppose the bigger roadblock for me is that Mathematica golfing can be really interesting in its own right

PyGamer0

4:04 AM

CMC: Given an integer i, convert i to an array of its binary form. Ex: 4 -> [1,0,0]

hyper-neutrino

B in jelly lol

att

and sledgehammer feels less "authentic", or something

Redwolf Programs

@PyGamer0 i=>i.toString(2) in JS

Razetime

@cairdcoinheringaahing Husk: `§SS

PyGamer0

python implementation anyone

hyper-neutrino

4:05 AM

lambda x:[*map(int,bin(x)[2:])]

Bubbler

lambda n:map(int,bin(n)[2:])

hyper-neutrino

wait that's a thing?

Bubbler

lol wut

hyper-neutrino

nope :c

caird coinheringaahing

No

Python ain't that nice :P

Bubbler

4:07 AM

yeah, it's a problem with working in so many different langs at once

Razetime

lol that looked suspiciously like ruby

Redwolf Programs

Oh I'm stupid, array form would be [...i.toString(2)].map(eval) in JS

Bubbler

it was a horrible mental mix of py and js

Redwolf Programs

I'm used to the loose IO requirements on main lol

hyper-neutrino

wait how the frick do you do base conversion in apl

why does 2 ⊤ 13 not work lol

Razetime

4:08 AM

Ruby: ->x{x.to_s(2)[2..].map &:hex}

caird coinheringaahing

Lower tack?

hyper-neutrino

nope

lyxal

@hyper-neutrino shouldn't the T be inverted?

Bubbler

@hyper-neutrino It only works in Extended

Razetime

@hyper-neutrino you need multiple 2's to get each bit

hyper-neutrino

4:08 AM

:c

Razetime

it's like a polymod

hyper-neutrino

ah

Bubbler

The proper mainstream way to do it is (⊥⍣¯1)

Razetime

so it's 2∘⊥⍣¯1

hyper-neutrino

huh okay

apl's ability to just invert random functions is quite amazing to me

like you can just difference array by reversing prefix sum array right?

like +\⍣¯1 or smth

Bubbler

4:11 AM

Yeah, that's a cool one

Unrelated String

ooh

Bubbler

but one problem is that APL's inverses are not well documented

J is better in that sense

hyper-neutrino

oh cool

i want to learn j. none of it makes any sense though lol - at least with apl, i could see some structure and where certain things started or ended

Bubbler

but J can't invert arbitrary math expression

hyper-neutrino

to me J just looks like someone dropped their keyboard except all of their keys are punctuation

it looks cool tho

Bubbler

4:13 AM

it uses suffix . and : for digraphs

and ^: can make an illusion of a face :P

hyper-neutrino

oh suffix digraphs? interesting

Bubbler

Grammar is generally the same as APL, but the train rule and inherent function ranks make it slightly harder

hyper-neutrino

huh, okay. do you have a recommendation for like a tutorial / place in the wiki to start looking through?

Bubbler

and lack of dfns is kinda wack sometimes (though it was added recently I think? not sure if it made into release)

@hyper-neutrino I guess you can start here, and after that, use this as a kind of a cheatsheet

A username

@PyGamer0 b in vyxal lol

hyper-neutrino

4:21 AM

@Bubbler oh cool, thanks :D doubt i'll end up getting too far; don't think i can learn APL and J and create my own language but we'll see lol

A username

Have we given up on BMG?

Or is someone going to schedule one?

hyper-neutrino

it was yesterday lol

28 hours and 22 minutes ago

Bubbler

I think they mean the next one

hyper-neutrino

oh

A username

Yes

hyper-neutrino

4:22 AM

well it wouldn't be the first time someone got the time wrong :p

sure, one of y'all ROs can schedule one now if you'd like; i think that'd make sense

i forget - why didn't we do recurring ones @RedwolfPrograms?

A username

I couldn't come to that one anyway :p. I can come to the next, and possibly the one after that.

Bubbler

Maybe because we need to make six different schedules for that

hyper-neutrino

true

time to appoint a bot to RO to do it for us /s

Bubbler

and recurring every 84 days... doesn't sound very nice

A username

What GPT-2 thinks of redwolf.

Bubbler

4:28 AM

It goes pretty poetic up to the middle of the second paragraph, and then it suddenly turns into a total garbage

A username

Yes

hyper-neutrino

fortunately, it doesn't matter, because you will get stuck in an infinite evaluation loop (or die from stack overflow if you don't have TCO) from the first paragraph

A username

True

Bubbler's:

lyxal

GPT-3 is way more jucier

A username

This could actually be accurate, idk

lyxal

4:31 AM

Nah, this is accuracy (disclaimer: not representative of redwolf)

A username

@lyxal What doe GPT-3 say to the prompt "Code Golf is"?

hyper-neutrino

that's a lot of images, please link them as a gist or collapse them in the future

DLosc

@Razetime Interesting. Do you think it's worth me opening an issue requesting it? And would creating a pull request increase the odds of the answer being "yes"?

A username

"Until I was 14, I didn't know what the internet was"

@hyper-neutrino Sorry

lyxal

@Ausername here

Bubbler

4:32 AM

@Ausername Exactly half correct and half wrong

A username

And we'll never know which. (Well, we can guess).

"Until I was 14, I didn't know what the internet was."

Razetime

@DLosc many golflangs have added an issue, what matters to get it into the site is a pull request adding the machinery to use it in code.golf

A username

"The first program I ever wrote in JavaScript was a code golf interpreter"

lyxal

@Bubbler is this more correct? (disclaimer: not representative of bubbler)

Razetime

I've expressed support of the language so far but i think adding votes to the issue proposal might help

hyper-neutrino

4:34 AM

i should PR jelly into an actual competitive programming site

Razetime

@hyper-neutrino I am very interested

which competitive site has an open codebase

hyper-neutrino

dmoj.ca

A username

@lyxal Almost certtainly not.

DLosc

@Razetime I was just thinking that APL (e.g.) would be treated as Unicode, so a program might be 24 bytes, but 8 characters. Then it would have the same score in characters on code.golf as it would in bytes (SBCS) here.

Razetime

yeah but APL isn't added yet so the required site components for adding an SBCS encoded language in aren't there

anagol has golfing languages but it is violently unintuitive to use them there

Bubbler

4:36 AM

@lyxal That one is 100% wrong (except for the input part) :P

hyper-neutrino

the thing about closed source automated golfing sites is that you get screwed over by I/O formatting lol

Razetime

@DLosc it has J, however, and I think that's why Pip may be accepted easier

(or even golfscript)

hyper-neutrino

here we just say "if it looks representative enough it's good enough"

A username

Lol GPT-2 is better than GPT-3

lyxal

@Bubbler you telling me Amador t'Kerstarr isn't a pseudonym of yours?

Razetime

4:37 AM

but i obviously like pip more

DLosc

@Razetime But I'm saying, why does it have to be treated as SBCS at all? Why not just treat APL character like the non-ASCII characters in Julia, for example?

@Razetime Awwww <3

Razetime

welp i'm not sure why

DLosc

Hm. There isn't a way to use command-line flags on that site, is there?

Razetime

well, you can do something like #!ruby -np on the first line

but for pip i don't think so

DLosc

Hmmm... >:^)

Actually, it's probably not worthwhile adding syntax to specify flags in the code. They're designed to do stuff in 1 byte (or 0, under current CGCC rules) that would take 2-4 bytes natively.

Though the -l flag is a bit more interesting. I should probably add a unary operator that does the same thing.

Razetime

5:09 AM

kewl

DLosc

Ugh, I'm solving one of these and I'm reminded why I don't like hidden-solution code golf. I've got 129 bytes, can't seem to find any ways to shorten it, and the leaderboard is [121, 123, 124, 124, 124, 126, 126]. I can't even admire or upvote these golf wizards' work. All I can do is stare in sadness, knowing that I am not one of them. :(

... And my 129-byte solution failed anyway. XP

hyper-neutrino

F :( which problem is it

DLosc

code.golf/intersection#python

PyGamer0

CMC: Prepend **CMC**: (notice trailing space) to the input.

Unrelated String

@wasif i feel like intercal is more in the tradition of older languages that try to leverage some plain english structure, but there are a good few esolangs that lean more into actual plain english

hyper-neutrino

5:22 AM

“**CMC**: ”+ in yuno (and therefore “**CMC**: ”; in Jelly) is actually shorter than trying to do string compression lol

idk if you can base encode it

DLosc

@PyGamer0 Pip, boring solution, 13 bytes: "**CMC**: ".a

Pip, fun solution, 14 bytes: [PZ"**CM"':sa]

Razetime

@PyGamer0 stax at 10

DLosc

@DLosc Good news: fixed the bug. Bad news: code is now 132 bytes.

hyper-neutrino

me, still at 155: :c

DLosc

Oof :c

Razetime

5:34 AM

most of my code.golf solutions are first made normally

hyper-neutrino

my solution is also extremely stupid :p

Razetime

then I see an xnor answer with some trick and it halves my code size

DLosc

Hmm... new approach, maybe? Nope, 148 bytes.

att

how does this take input

DLosc

Command-line arguments

(Not super convenient for Python. The import sys;sys.argv[1:] boilerplate is annoying.)

New Posts

5:43 AM

0

Q: No of subsets of a given array such that their product is in the form of p1*p2*p3*

Given an array A of size N. You have to find the number of subsets such that their product is in the form of p1p2p3... where p1, p2, p3,.... are the prime numbers whose power is 1 Example: Lets pick an array A of size 5. A[5] = {2, 3, 15, 55, 21} The subsets in our answers should be {2,3}, {2, 15...

DLosc

Oh. You know what, I bet it's one of those exec tricks, isn't it. >_<

hyper-neutrino

given that the byte and char counts are different, very likely so

DLosc

Wait, they are? Oy, I wasn't even thinking about non-ASCII.

hyper-neutrino

lol

att

5:58 AM

hm i get stuck at 130

DLosc

@att Me too.

To be fair, the top answer is 121 characters and 121 bytes.

hyper-neutrino

@DLosc it looks like 86 chars to me

DLosc

Wait...

Okay, that's a weird UI decision

hyper-neutrino

lol

DLosc

I expected that with the bytes tab selected, I was only seeing the bytes leaderboard, and vice versa. Didn't know what the smaller numbers meant, but ignored them.

:P

hyper-neutrino

6:04 AM

lol fair enough

DLosc

So let me correct my earlier statement: To be unfair, the top answer in bytes is 121 bytes, and the top answer in characters is also 121 bytes.

(They happen to be the same answer.)

hyper-neutrino

yep :p

Bubbler

The 86 char one is 202b 86c actually

DLosc

> Okay, that's a WEIRD UI decision

Why would it show both the bytes solution and the chars solution on the same page when there's a choice of tabs for Bytes OR Chars?

ANYWAY, there's still a 121-byte, 121-character solution out there, and the best I've gotten is 130. The exec idea turned out to be 135 characters--close, but no cigar yet.

Make that 134.

Hahaha, now my exec solution is 130.

AviFS

6:49 AM

@Ausername Where is this from?

Bubbler

@DLosc I got 128

A username

@AviFS GPT-2 run on redwolf's chat profile.

AviFS

ehhhh, what is that?

looking for his chat profile...

just a tad lost

hyper-neutrino

chat.stackexchange.com/users/347075/redwolf-programs

AviFS

Thanks! And what does GPT-2 mean?

Razetime

6:57 AM

@DLosc wow you've solved a lot of holes

hyper-neutrino

@AviFS GPT-2 is a generative AI

AviFS

... I finally understand!

It got all that from this?

> Interested in math, science, computer science, history, and so on. Currently a high school student, although I spend most of my time there on CGCC. One of the room owners of The Nineteenth Byte, Code Golf's main room.

I own a server, and sometimes do game development or host people's projects. I like politics, but not politicians.

Working on a golfing language, Ash.

hyper-neutrino

it's pre-trained

AviFS

that much, of course

is there a link to use it free? i haven't found one yet

finding a couple webapps that use the engine

but none do quite the above

lyxal

Apply for GPT-3 like a real gamer

It's much better

And free for the first three months

@AviFS here's the results from running it on redwolf's chat bio

DLosc

7:13 AM

@Razetime Uh, what? On code.golf? I don't think I've been there before today, and I submitted one solution today anonymously.

Razetime

@DLosc lol what

DLosc

Wait

This is that place where I solved a bunch of stuff during my Julia kick a few years back?? I didn't recognize it.

I wonder if it changed URLs since then.

Razetime

i think so

the point calculations have changed

also they added dark theme, new editing features for assembly, so on

att

@DLosc got 125 now, no exec

Bubbler

I still have x,y,w,h,X,Y,W,H=map(int,l.split()) in my code smh

hyper-neutrino

7:19 AM

i had that for quite a while lol

i'm still at like well over 140 i think :c

wait no i think i'm still at 155

DLosc

@Bubbler It's hard to find a better way to do it! My non-exec 130 had that. The exec one used an every-other slice, but it still had x,w,X,W=

Bubbler

Just spotted a 126 :P

Gotta leave now though

hyper-neutrino

7:36 AM

wait, editing a post dequeues it from close? wtf

or is that just a mod thing (also idk if that's any edit or specifically edits from the queue)

StackMeter

ayyy new answer

AviFS

If something runs forever, does TIO eventually abort & error?

hyper-neutrino

@AviFS if it hits 128KiB of output or 60 seconds of execution TIO kills it

AviFS

Oh yeah, it just did at 60 secs

You guys clearly beat the 60 second mark in answering!

hyper-neutrino

apparently the 128 KiB limit is not really a system limit but to avoid your browser freezing from too much attempting to be displayed or smth. or at least, i vaguely remember something like that

AviFS

7:43 AM

Going to write an answer abusing that for the "make program error on evens" challenge

Wonder if that'll count

Adám

> TIO, 123 bytes

hyper-neutrino

@AviFS termination via TIO isn't a real error because the code itself isn't erroring, at least IMO

AviFS

I mean I'd normally agree...

But given that I have a horse in the race, I'm inclined not to

I'll post it and see if I get downvoted to oblivion

The language doesn't have any built in erroring

So it's the best it can do

Bubbler

@DLosc Just got 124 and removed the smh line

@AviFS No, if the language can't inherently error, you simply can't use the language

AviFS

Ouch, really?

We don't really have a meta consensus atm, might be work asking

Bubbler

7:47 AM

That's how the site works

AviFS

This is all I could find.

Bubbler

There must be a ton of meta already about that...

AviFS

And it's not really much of a consensus

Bubbler

No, I mean for more general stuff (not necessarily erroring)

AviFS

@Bubbler If you can share a link, that'd help a lot! So far I've only found the measly link I posted

Bubbler

7:51 AM

Like, if a lang doesn't have a random number generator, you can't use it in random challenges, if it doesn't have date builtin you can't use it for date, etc

att

@Bubbler mind sharing if that used exec?

AviFS

True, but errors in particular haven't been elaborated on

Bubbler

I'm on mobile now so I can't present the link, but you should find some of it on default io thread

hyper-neutrino

also for example, if your language cannot access internet you can't use it for internet challenges

AviFS

I can imagine lots of simple interpreters erroring to stdout, for instance

Surely those still count as errors

hyper-neutrino

7:53 AM

so "False # my language can't use internet" to "detect if your computer has internet" is NOT valid, despite several people thinking they're clever and original

AviFS

Or at least, the question of whether they do is nontrivial

hyper-neutrino

"error" needs to be defined by the challenge but i think there exists a default

AviFS

But if those do count, then it's very unclear how to differentiate

Bubbler

@att To answer for amusement, it uses eval :P

Not exec

AviFS

I'll look on default io, but I found nothing by searching variants of 'error' on meta

att

7:54 AM

close enough

AviFS

Nothing on default IO, @Bubbler

Just this:

> Functions may return a boolean value via the presence or absence of an error/exception

Which is irrelevant

Bubbler

An error is something defined by your language. If not, "nonzero exit code" is the convention made by OS vendors

If a lang doesn't support either one, you cannot error in it

AviFS

That definition makes a lot of sense, just pointing out there's no meta consensus right now

Transcript for