The Nineteenth Byte

New Posts

12:18 AM

0

Q: Very basic four operations calculator

This is my first question so here goes... I want a calculator that handles the four basic operations. The input is a string containing two one-digit numbers with one operation symbol between them. The output should be a number or string that is or contains the answer to the input. You can use any...

code-golf

Ginger

I smell dupe

lyxal

you're right

21

Q: Basic Calculator

You must write a program to evaluate a string that would be entered into a calculator. The program must accept input and output the correct answer. For languages that do not have standard input/output functions, you may assume the functions readLine and print. Requirements Does not use any k...

code-golf math arithmetic

it's not every day I get to hammer things

:p

caird coinheringaahin g

Just a reminder to be cautious with downvotes to new users posting dupe challenges - we're familiar with the site, and know to search for dupes before posting. They aren't and don't, and downvotes can be discouraging

lyxal

^

caird coinheringaahin g

@lyxal Beat me to it by a few seconds cause my laptop refusing to click the "share" link :/

@cairdcoinheringaahing Note that I'm not saying "don't downvote them", just that they are less downvote "worthy" than a lot of other posts :)

lyxal

12:26 AM

@cairdcoinheringaahing it could have been a quality downvote though

Still, leaving a downvote explanation on new users posts is a good idea

Regardless of why

caird coinheringaahin g

@lyxal Yeah, absolutely. Again, I'm not saying that people shouldn't downvote posts just because a new person posted them

But I wanted to get ahead of a potential mass downvoting

lyxal

Fair

caird coinheringaahin g

Also, I haven't written a challenge on the site in a while, but regularly write latex for my degree, and the switch from $ to \$ is getting to me :P

lyxal

SE post writing will do be like that

Ginger

12:46 AM

welp, I managed to crash Inkscape :/

YES

@Bbrk24 I did it!

whaddaya think?

OldSandboxPosts

Sandbox posts last active a week ago: German pharmacy payment

Sandbox Posts

1:08 AM

0

A: Sandbox for Proposed Challenges

Construct this number Given a constructible point \$(x, y) \in \mathbb R^2\$, output the steps required to construct \$(x, y)\$ Constructing a point Consider the following "construction" of a point \$(\alpha, \beta)\$ in the Cartesian plane: Begin with the points \$(0, 0)\$ and \$(1, 0)\$. Then, ...

Bbrk24

@Ginger Wow, that looks nice! I will say though that part of the appeal of the symbol I have is that the two things sticking out the sides are at different angles

Ginger

@Bbrk24 but of course, we can't have them be straight now can we? :p

caird coinheringaahin g

@SandboxPosts If I could get some quick feedback on this? I intend to post in a couple of days if there aren't any obvious issues

Ginger

I can do that pretty easily, one sec

caird coinheringaahin g

@SandboxPosts Also, damn: This is the first time I've posted in the Sandbox since becoming a moderator

Ginger

1:11 AM

:O

Bbrk24

That is a very interesting challenge that I have no idea how to even attempt it without golfing

caird coinheringaahin g

May or may not be inspired by the exam I sat this mroning :P

Ginger

Bbrk24

wrong layer?

:P

Ginger

@Bbrk24 does ^^^ look better?

@Bbrk24 nah, I wanted to make sure you were satisfied with the angle before I composited it all back together

that's a screenshot of my editor :b

caird coinheringaahin g

1:15 AM

they're still straight :P

Ginger

straight is relative

Bbrk24

They're still parallel though, both 70 degrees

(yes I measured)

caird coinheringaahin g

@Ginger Add some curvature to them :P

Ginger

you want them to... not be parallel?

caird coinheringaahin g

Also, given that this is coming up on 3 years in the Sandbox: any feedback?

Bbrk24

1:17 AM

@Ginger The ones in my current pfp are 79 and 67 degrees respectively

lyxal

3 years?!

ain't no way

caird coinheringaahin g

Namely, a) is it understandable, and b) do I need more test cases?

> answered Jun 9, 2020 at 0:43

Ginger

@Bbrk24 *internal screaming*

lyxal

@cairdcoinheringaahing I mean dang I rember when it was posted no way was that that 3 years ago

Ginger

I will do it if you want, but it will pain me to do so

Bbrk24

1:18 AM

yes please

Ginger

ok, if you're sure

caird coinheringaahin g

@lyxal I have a monopoly koth proposal in the Sandbox from 2017 :P

But aside from that, complete the landscape is the longest challenge I have in the Sandbox

lyxal

@cairdcoinheringaahing I more mean it doesn't feel like 3 years insert something about time quote here </end quote chain>

caird coinheringaahin g

I know what you mean, I'm just remarking on how long some of my posts have been in the Sandbox :P

Huh, of my 77 (undeleted) Sandbox posts, 15 are still "pending"

Ginger

done

Bbrk24

1:26 AM

~~they're backwards~~

it's a good idea to test how that looks at small sizes though

Ginger

please do not make me swap them

I'm going to bed soon

Bbrk24

hm

really doesn't work at 16x16

Ginger

yeaaah

New Posts

0

Q: Complete the landscape

Carcassonne is a tile-based game, where the objective is to construct Roads, Cities and Monasteries, in order to score points. The game works by players taking turns to draw and place tiles to construct a landscape, then claiming roads, cities and monasteries. An example landscape is: There are ...

code-golf array board-game tiling

Bbrk24

Well, thanks anyways

caird coinheringaahin g

1:29 AM

@NewPosts oh hey, that's fun: my previous challenge was also posted on the 3rd of the month (April) :P

Ginger

@Bbrk24 no problem!

who am I to turn down a chance to practice my vector art skills d:

lyxal

completely different topic: I really hate working with backslashes. They are painful

Bbrk24

2:05 AM

> type 'T?' cannot be converted to contextual type 'T?'

Swift, what did I ever do to you

lyxal

What's a contextual type?

Bbrk24

The type it expects based on the rest of the expression

like if you have 1 + x, the contextual type of x is Int

lyxal

So then what are you doing where an object can't be converted to the same type as itself?

Bbrk24

That's what I want to know

swiftfiddle.com/3trho7swxbdn7akr5snlue4mwu

lyxal

What does the \T? do?

I get it's optional T but what's the backslash

Bbrk24

2:14 AM

\T.foo is equivalent to { (x: T) in x.foo }, modulo compiler oddities

(actually it can be a bit more than that but when it appears where you'd expect a lambda that's what it means)

lyxal

What does { (x: T) in x.foo} do?

Bbrk24

uh, equivalent to C# (T x) => x.Foo? it's a lambda

lyxal

Ah

See I don't know swift

I now remember how I disliked the usage of the word in for lambdas in swift

Bbrk24

5

A: What are common options for lambda function syntax?

Swift-style If you haven’t seen it yet, let me introduce you to https://fuckingclosuresyntax.com. More seriously, the full syntax is this: { [byValueCapture] (argName: ArgType) -> ReturnType in body } …but most of that is optional. A few things to note: Only by-value captures are specified; by-...

lyxal

Yeah we had a whole conversation about it here once

Bbrk24

2:20 AM

Anyways, I've created a forum post

forums.swift.org/t/type-cannot-be-converted-to-itself/65339

Ah, known bug. Fun. github.com/apple/swift/issues/55343

Unrelated String

Bbrk24

You have been put in timeout.

Go stand in the corner and think about what you did.

lyxal

@UnrelatedString got bamboozled then, thinking "I didn't accidentally put the room in time out did I?" lol

Aiden Chow

@DLosc upper left

Bbrk24

@UnrelatedString What pronouns do you use? I feel like I must've asked this before

Unrelated String

2:35 AM

he/him (but they/them is fine)
i feel like i had it in my chat bio at some point but i guess i forgot to keep them when i set this one :P

caird coinheringaahin g

@Bbrk24 Dammit, don't tell me I have to timeout the room :P

On the other hand, it is funny :P

This room was placed in timeout for 2 hours 46 minutes; Cause I can :P

Damn, didn't realise I could go for that long

Timeout cleared

lyxal

@cairdcoinheringaahing well done chief

Excellent time outing

10/10

caird coinheringaahin g

I could try 99999 seconds if you want :P

lyxal

You won't :p

caird coinheringaahin g

This room was placed in timeout for 1 day; I could do with a day off

That's the max, sadly

lyxal

2:45 AM

The worst part is that I can't tell if that's real or not :p

caird coinheringaahin g

Timeout cleared

Any regular user can confirm that was legit :P

lyxal

Is this some sort of normal user thing I'm too room owner to understand? :p

caird coinheringaahin g

If you want, I can demote you so you can verify it :P

lyxal

That takes effort tho

ElectricEcho

Might as well just use an alt :p

caird coinheringaahin g

2:48 AM

Take the alt to chat.stackexchange.com/rooms/120733/osp-testing

lyxal

Done

Aiden Chow

@cairdcoinheringaahing Desmos, 28 bytes: f(l)=[1...l.length][l=1].max Try It On Desmos!

lyxal

@cairdcoinheringaahing well actually no I don't see because I can't talk in there anyway

There's no time out box for it to display

caird coinheringaahin g

Your bot has write access

lyxal

Oh

I didn't refresh the page

So I didn't see it :p

Seggan

2:52 AM

@cairdcoinheringaahing i cant

lyxal

Saw it now :p

caird coinheringaahin g

@Seggan That's cause, unsurprisingly, I didn't leave TNB frozen for any significant amount of time

I don't want to put y'all in timeout for any proper amount of time, unless necessary

Bbrk24

3:58 AM

Is it possible to write arch-agnostic llvm ir? The stuff clang generates includes things like target-cpu

Hm, it seems to work just fine without that

Bbrk24

4:41 AM

terrible meme I know

Bbrk24

5:26 AM

oh I mistyped one of the registers — they’re supposed to be the same thing, not one rdi and one rdx

Simd

8:30 AM

hi!

how can this be golfed?

mask = []
for _ in range(20):
    prefix_length = np.random.randint(1, 20)
    mask.append([True]*prefix_length + [False]*(20-prefix_length))
mask = np.array(mask)

mousetail

List comprehension?

Simd

I need an numpy array at the end

mousetail

Yea

mask = np.array([.... for ...])

Simd

yes that would save some bytes, thank you

Neil

10:20 AM

@Simd best I could find was mask=np.mgrid[0:20,0:20][1]<=np.random.randint(1,20,20)

mousetail

CMC Given a length of a string, output the number of ways to divide it into words. Each word must be at least 1 character long and the spaces seperating them cost exactly 1 character

Neil

I feel that that's a dupe of an existing challenge

mousetail

Probably

Simd

10:38 AM

@Neil that is really good!

Neil

actually that should be <; <= results in off-by-one errors

Simd

@Neil hmm... Actually I am not sure I understand it. Why does it give Trues followed by Falses on each row?

Oh I see

I had to look up what mgrid does

Neil

np.mgrid(0:20,0:20)[1] returns an array of 20 rows of 0..19, and then the < compares each row with each of the 20 random numbers from 0 to 19

Simd

@Neil that is cool

Neil

ugh, I mean 1 to 19 of course

Simd

10:49 AM

Although I am very grateful, SO people keep on answering questions I don't ask?! stackoverflow.com/questions/76395255/…

mousetail

11:39 AM

@Simd That's weired, your question is quite clear but the answers but the answers don't seem to understand it

Why does the one that just fills the whole space with red have a upvote

lyxal

12:26 PM

s.replaceAll("\\\\\\\\", "\\\\\\\\\\\\\\\\")

Thanks scala

very cool

for reference, s.replace("\\", "\\\\") suffices in something like python

one does not need 8-16 backslashes

mousetail

Is that because it's regex?

lyxal

apparently

mousetail

No raw string option?

lyxal

I'm not aware of one

looks like it only needs to be .replaceAll("\\\\", "\\\\\\\\")

which still requires an unholy amount of backslashes

mousetail

12:48 PM

You think that is much?

    $subject = preg_replace("~(\.\s*''\s*)+\.~is", '.', $subject);
    $subject = preg_replace("~([^\\\\](\\\\\\\\)*|^)''\s*\.~is", '\\1', $subject);
    $subject = preg_replace("~\.\s*''~is", '', $subject);

This is from my companies code base

Actually that's the same amount

Simd

1:39 PM

@mousetail who knows!

PlaceReporter99

1:59 PM

@mousetail If I encode each character along with a cryptographic hash function of it and then along with that encode that hash with a cryptographic hash function and then along with that encode that hash with a cryptographic hash function and then..., i might be able to make it so that a single character is $10^{15}$ bytes!

mousetail

That wouldn't fill the codespace

Hashes don't typically increase the size

PlaceReporter99

@mousetail Idea from this twitter post.

mousetail

Doesn't actually have the required number of builtins though

PlaceReporter99

But still takes $10^{15}$ bytes

mousetail

It's very boring though

redundancy is hardly a challenge

PlaceReporter99

2:08 PM

@mousetail Yeah, I know. It's boring to crack hashes as they take YEARS unless you have a hash dictionary with the hash inside it.

mousetail

It's not if it's just hashing one character

you can do that in milliseconds

PlaceReporter99

@cairdcoinheringaahing This room was placed in timeout for 1 day; I could do with a day off

No, not real.

New Posts

4:29 PM

0

Q: Maximum code-golf length

If we have a code-golf question that we have a golfed answer to in, say, Python, how long does that program have to be for it to not be a good idea to ask that question/for that to be code-golf (if there is a cut-off at all)?

discussion code-golf asking-questions

Bbrk24

5:20 PM

How is it that I have clang but not llc

How do I compile my LLVM IR

user

@lyxal Wait what is this from

Can't you use the same Python code?

Python and Scala use the same escape or whatever right

Make sure to use replace instead of replaceAll. The latter uses regex (the names are dumb but they're what Java uses)

Bbrk24

6:13 PM

(I figured it out, btw: clang accepts .ll files just as well as .c files.)

Bbrk24

6:39 PM

Me: clang -emit-obj

Clang:

LINK : warning LNK4044: unrecognized option '/e'; ignored
LINK : fatal error LNK1181: cannot open input file 'mit-obj.obj'

PlaceReporter99

6:52 PM

5d411da8fa2191251e7075e5361285d044ccd9c8686da7719f4f95763cda2bdcf293356a1f4e81e9a3416917da00c6ec0d17d0b701d74861f6bdaf2db6ab043f

Mast

7:03 PM

@PlaceReporter99 Do you have a question?

PlaceReporter99

8:33 PM

@Mast no it’s a SHA512 string.

It’s been hashed

@mousetail dictionary attack?

mousetail

You don't even need a dictionary attack when there are just 256 options

but yes that would make it even faster

PlaceReporter99

@mousetail I think the hash would be more for integrity of data than security?

@mousetail but I would also hash the hash…

mousetail

Integrity is security right?

Ability for a malicious actor to modify

PlaceReporter99

9:30 PM

@Mr.Xcoder have you answered my “logarithmic incrementation” challenge? It has math.

@mousetail could also be from transmission error.

caird coinheringaahin g

9:42 PM

@PlaceReporter99 Please don't ping people from literally years ago unless necessary

lyxal

10:43 PM

@user I thought replace only replaces the first occurrence

user

No

Java dum

replace replaces all occurrences, but without regex. replaceAll uses regex

lyxal

Well there was one of those string functions that only replaced the first occurrence

@user well guess I need to go change all the places I've used replace all

noodle man

if a submission is a function, do you have to include importing the standard library in your byte count?

Unrelated String

imports you need yeah

noodle man

i know that, but is it different for standard lib or no? ig not

Unrelated String

10:49 PM

if you recall seeing something to the contrary it was probably c

user

You need it for stdlib too

Unrelated String

where you can literally just use stuff without importing headers and just get warned because it was never declared

it's very funny

user

The C compiler is like a Rottweiler owner who puts a leash on their dog before taking it for a walk but doesn't bother holding the end of the leash

8

Bbrk24

Tangential: does anyone here have clang 16 on a Linux machine and would be willing to help me test something? My VM only has clang 13

Ginger

11:05 PM

me when I only have clang 11

Bbrk24

11:17 PM

I would hate to put this out there and only have it work on Windows

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