The Nineteenth Byte

For today's challenge you have to take an input, and if your source code is reversed, then the input should be printed doubled. Let's say your source code is ABC and its input is xyz. If I write CBA instead and run it, the output must be any of be xyzxyz or xyz xyz or xyz xyz For any numerical ...

Wasif

9:00 AM

Hi everyone!

To whom can we request to add a language to TIO?

Adám

@Wasif In principle, Dennis in the room dedicated to TIO, but unfortunately, he has to deal with some personal matters, so TIO isn't being updated lately.

Wasif

9:23 AM

@Adám Thanks for the chat room link

Adám

Well, it won't help you much. We really need someone to create a clone of TIO.

rak1507

what's stopping someone from forking it?

Adám

Forking it is the easy part. Setting it up to run is the difficult part.

Wasif

@Adám yeah there are several interpreters available of different esolangs available online

But TIO is the best, collection of the interpreters

Adám

If someone was willing to do it, I'm pretty sure my company would pay them €500 a year for the expenses and the work.

4

New Main Posts

9:37 AM

0

Q: She sells sanctuary

A huge storm is ravaging the world and as you and your family run away from it, you come across a gigantic shelter run by a girl. She tells you that "she sells sanctuary" and that different types of rooms are offered at different prices. A room may only house one person. The challenge Write a pro...

code-golf

ChartZ Belatedly

12:49 PM

In fact, TIO has a repository on GitHub specifically for setting it up, so literally anyone who was willing to go through the hassle of hosting it would be able to, I believe

github.com/TryItOnline/tiosetup

user202729

@Anush With 0 answers, it's not going to become an advertisement (i.e. HNQ)

Imaginary bounty for answers that takes time sublinear in the output (number of graphs) (might be useful: Burnside lemma). Real bounty for proof that it's not possible. — user202729 1 min ago

Given that, it's either that people don't feel like renting a server (it actually costs money, obviously), or think that current TIO is good enough...

Besides, there are other issues with some languages (Mathematica license).

Wasif

Hi everyone, how many of you prefer to use mobile rather than a computer to browse Stack exchange?

ChartZ Belatedly

1:45 PM

@user202729 IIRC APL and Mathematica both require licenses but they're either both free or Dennis managed to get them both for free somehow

@Wasif I use both, but prefer computer for anything other than getting notifications

Anush

@user202729. Why do they need to rent a server?

user

@ChartZBelatedly Dyalog APL can be used without registering

ChartZ Belatedly

@user Not in the context of TIO

Anush

Chat here is unusable on an iPad. You can't see what you are typing

user

Oh right

ChartZ Belatedly

1:46 PM

Something to do with the fact that it's a commercial service

user

@Anush On an iPhone, at least, hitting Done lets you click on what you’re typing; then you can see it

i don’t know if it’s the same on an iPad, though, I’ve never used one

Wasif

@Anush right, chatting is at its best in full site

And one annoying thing in mobile is i have to refresh websiye every time :-(

ChartZ Belatedly

Q: What information should be included in a "Here's what you need to know" guide for new users that isn't about answering or asking?

I've got a section on moderators and privileges, one on commenting and one on editing already

Anush

2:38 PM

@user good question. I will see

can anyone please make any comments on codegolf.meta.stackexchange.com/a/20842/98590 so that it doesn't get closed when I pose it again

Redwolf Programs

I'd definitely specify exactly how to draw it, in addition to the example code.

ChartZ Belatedly

@Anush I'd recommend browsing through these questions for examples of how to properly specify graphical-output code-golf challenges

Anush

thanks

ChartZ Belatedly

@NewMainPosts Does she sells sanctuary on the sea shore? :P

ChartZ Belatedly

3:10 PM

Any feedback?

Redwolf Programs

It might just be me but it took me a few reads to understand it fully. I think if you explain earlier in the challenge that m is a value chosen by the answerer it'd be easier to understand, since at first I thought it meant for any value of m it should print m * n

ChartZ Belatedly

@RedwolfPrograms Is that clearer?

Redwolf Programs

3:27 PM

Lots! I think paragraph 3 is a duplicate now, though.

rak1507

@Wasif I never use mobile

ChartZ Belatedly

@RedwolfPrograms I think its worth keeping just as a little bit of extra clarification

Wasif

@rak1507 why?

rak1507

no reason to for me, and I'm not even able to log in on mobile iirc

Wasif

4:02 PM

@rak1507 you can just log in to the code golf stackexchange in mobile, and you can then use chat

rak1507

I know, I'm just lazy

Wasif

But you might have an unknown problem which we don't know

@rak1507 hehe same to me

rak1507

my problem is laziness, and it's very known

Razetime

4:20 PM

@rak1507 me when I try to write stuff for the competition

rak1507

oh god don't mention that I've not done a single phase two problem lmao

Razetime

some of the phase 2 ones are just phase 1s in disguise tho

rak1507

I've 'done' some in that I have ideas how I would do them but I've not actually submitted any

Razetime

yeah I'm not submitting yet

Maybe in april

Wezl

is this too boring, hard, or unclear?

0

A: Sandbox for Proposed Challenges

Compile Roman Numerals to <some language> code-golfroman-numerals Your code will, given an integer i, output code code(i) in any programming language that will evaluate to (print, push, return) i by itself. code(i) ++ code(i') should evaluate to i + i' for an i' <= i and i' - i for an i' > i. You...

rak1507

4:35 PM

seems tough

user202729

4:51 PM

@Wezl Looks okay (to answer).

Might need some atexit for most languages.

Most practical languages, that is.

Wezl

so it is boring

rak1507

hmm, I'm not sure how to put this but I'll try, no offense intended: I think the answers would be interesting, but the challenge itself isn't very

Wasif

@Wezl Good challenge

(No offence to anyone, my personal opinion)

rak1507

it's a hard problem and an answer to it would probably be cool, but solving it personally doesn't really interest me that much

Wezl

@rak1507 I agree :(

but does that mean I should post it?

I guess noone would downvote it?

user202729

4:56 PM

People can downvote anything.

rak1507

I wouldn't downvote it, but I probably wouldn't upvote it either

Wezl

same

but it doesn't hurt to give people a challenge, so I will

Wasif

@Wezl We cannot guarantee you that you would only recieve up/down votes, opinions vary from people. If you like to post go ahead, you will get +1 from me

Probably you will get some upvotes followed by some downvotes

Like my recent challenges

Wezl

@user202729 is it alright if I cite this comment?, and if so, how do I type it?

user202729

... I'm not sure if there's an easy way to get the source code of a comment.

Getting the source code of an individual formula is easy (right click->...)

So, given a sequence \$p_1,\ldots p_n\$ where there's no \$p_i < p_{i+1} < p_{i+2}\$, the result of \$\operatorname{exec}(\operatorname{generate}(p_1) + \ldots + \operatorname{generate}(p_n))\$ (where \$+\$ denotes concatenation) should be \$p_n + \sum _{i=1} ^{n-1} p_i \times (-1)^{[p_i < p_{i+1}]}\$, right? — user202729 Feb 1 at 16:30

@Wezl Posting in chat works.

Only because there's no MathJax in chat.

Things posted on SE sites are licensed under CC BY-SA 4.0, which I think means it's always possible to cite things on it with proper attribution.

Wasif

5:06 PM

@Wezl Or you can also post a link to the comment: codegolf.meta.stackexchange.com/questions/2140/…

user202729

!?

To get the link, right click at the date of the comment and choose "copy link address".

Redwolf Programs

I've got a physical server with 8 cores and 24gb of ram. I'm using it for my websites right now, but if there'd be a lot of demand and I had enough time (and my server/internet could handle it) I could try to set up a TIO instance for any languages the regular TIO doesn't support properly at some point in the future

user202729

For popularity, just make it run all languages, so there will be more people use it

Disadvantage: hard disc

Wasif

@user202729 Sorry! My foolishness reminds me an old joke on Einstein, he used calculus to calculate price of some eggs, where his assistant did it by just a simple division and then multiplication (Don't remeber the exact joke)

New Main Posts

1

Q: Compile Roman Numerals to <some language>

Your code will, given an integer i, output code code(i) in any programming language that will evaluate to (print, push, return) i by itself. code(i) ++ code(i') should evaluate to i + i' for an i' <= i and i' - i for an i' > i. You do not have to handle cases like code(1) ++ code(2) ++ code(3) wh...

code-golf roman-numerals

user202729

5:16 PM

It will be extra easy in some stack-based languages, or even jelly (implicit output)

Wezl

but it might be hard to produce the fancy characters

@user202729 It might be too late to edit, but do you think it would be more interesting to require outputting each intermediate sum?

or maybe the outputting at the end is the most interesting part and the only reason it's not just an overcomplicated duplicate of the vanilla roman numeral reading challenge

ChartZ Belatedly

5:39 PM

@Wezl If there's one thing guaranteed to happen on this site, it's that you'll get at least one downvote whenever you post a challenge and that whoever did it won't bother leaving an explanation

user

6:40 PM

Yay, I just got my first upvoted and accepted answer on Meta!

CMM: What can be done to encourage more answers to old questions with few answers?

Redwolf Programs

Is that a problem?

I've never noticed many of those.

Unrelated String

@user sometimes old questions are just bad, and if they're not bad then someone's going to find them and leave an answer that's like half as long as the old shortest

user

I guess a lot of old questions are bad and/or have lots of answers already, but there are some good ones that ought to have more attention but don't.

I don't know how Community chooses questions to bump, but those with a high votes:answers ratio should be prioritized (unless they already are)

Adám

6:56 PM

@user One could bounty them.

One of the possible bounty reasons is literally

Redwolf Programs

Part of it might be that answers to those mostly go unnoticed. I've put lots of time into challenges with few answers, and only gotten one or two upvotes, when a 5-minute answer to a new challenge can easily get +5 or more.

user

@Adám That relies on individuals to hunt questions down and offer rep on them

Adám

> Draw attention
This question has not received enough attention.

ChartZ Belatedly

@user Answer them

user

@ChartZBelatedly That's not always so easy :P

Redwolf Programs

6:58 PM

Even answering an unanswered question from 2016, which took a whole weekend, got me fewer upvotes than answering two or three new challenges the next few days.

Adám

@user Or you could make general bounties without a time limit.

ChartZ Belatedly

We have 12000+ questions on the site and people always want more. Answering old questions bumps them to the active page and people add more answers

user

@Adám A bounty without a deadline? Yeah, that sounds like a good idea.

ChartZ Belatedly

@user Community doesn't really bump questions on main any more

Adám

Make a bounty for any answer to an old post with less than N answers and no new answer in the last M years.

user

6:59 PM

@ChartZBelatedly I thought one was bumped just a few days ago

ChartZ Belatedly

@user Yeah, if it only bumps one every few days, it'll take years to get through all the old questions

Redwolf Programs

Why not just bump them all at once? :p

ChartZ Belatedly

That'll drown new posts

Finding old, answerable questions and answering them is IMO the best way to attract attention to them

user

@ChartZBelatedly Bump the new posts :P

Redwolf Programs

I should make a userscript which adds a tab for old, high voted challenges with few answers, that refreshes daily

user

7:03 PM

@RedwolfPrograms That would be awesome

Redwolf Programs

I'll start development on it when I get home.

ChartZ Belatedly

IIRC the "Question of the Day" bit of the gradscript was supposed to "bump" old questions, but it's kinda broken now :?

user

I just installed the graduation userscript, but everything is green now :(

ChartZ Belatedly

Embrace the green :P

user

What in the world is the Porpoise Challenge button?

ChartZ Belatedly

7:11 PM

> What text to use for the porpise challenge button?

Propose Challenge

In 2016 it was a meme to call it "Porpoise" instead of "Propose" :P

user

Oh ok

Any idea what "goats instead of boats" does?

ChartZ Belatedly

Changes the upvote button

Don't think it works anymore since SE did some visual changes to the buttons

user

That's too bad

ChartZ Belatedly

TBH the only reasons I use the gradscript is automated leaderboards and green tags

user

At least now I know how Downgoat got their name :P

ChartZ Belatedly

7:14 PM

@user Other way around - Downgoat developed the script and put that in :P

Redwolf Programs

@ChartZBelatedly What if someone were to make a leaderboard-and-green-tags userscript?

user

Oh ok

ChartZ Belatedly

@RedwolfPrograms I probably wouldn't install it

user

@ChartZBelatedly I guess we'll never know why the goat is upside down, then

I wish someone could modify the graduation userscript to make it work better with the normal site's design

Redwolf Programs

Work better in what way?

user

7:17 PM

Keep the same font, colors, etc.

Redwolf Programs

So just the features, without the redesign?

user

It's disorienting, seeing the original site for half a second before it changes to that god-awful green

Redwolf Programs

I think the graduation script is kind of outdated, now that the site got a redesign

user

@RedwolfPrograms Pretty much, yeah

What's an easy way to test userscripts as you're making them? Or do you just save+install each time you make changes?

Redwolf Programs

The userscript manager comes with an editor

It's not very good, but it works I guess

user

7:25 PM

Oh cool

New Bounties With No Deadlines

0

A: List of bounties with no deadline

250-500 rep for answers to good, old questions with few answers This bounty is for answers to questions that meet the following criteria: They have a score of 10 or more (and fewer than 4 downvotes) They haven't had an answer in 3 years There are fewer than 10 answers Any answer to such a quest...

Redwolf Programs

That's more rep than for answering an unanswered question :p

I'm working on a new KoTH

I might actually use the sandbox this time

rak1507

time to write a SEDE query for that...

Redwolf Programs

I haven't done a KoTH in a while actually...

ChartZ Belatedly

@RedwolfPrograms Boo, what are you, some kinda "sensible challenge writer"? :P

Redwolf Programs

7:30 PM

The last one was one of my best received questions, actually

I stole it from Hyper, but still :p

rak1507

hmm how do you get the date of the last answer

Redwolf Programs

You have to inner join the posts that are answers, filtered by the parent post I think, then count them with sum(case when ... then 1 else 0 end)

rak1507

ugh

Redwolf Programs

Sort of like how you count up/down votes

I'd try but I have absolutely no idea how joins work and I'm convinced I never will

rak1507

lol same oh well lets hope someone else makes a query

ChartZ Belatedly

7:33 PM

Just use the SE search

I like SEDE

Search for you

thanks <3

Slightly over 2000 posts that meet the criteria, minimum :P

rak1507

whats 2000 * 250

user

7:36 PM

@RedwolfPrograms Well, unanswered questions are included in my bounty

rak1507

@user you're gonna have to get more rep :D

ChartZ Belatedly

@rak1507 500,000

Or 250% of Dennis' rep

user

2000*250
DOMAIN ERROR
2000*250
∧

rak1507

sounds pretty doable

ChartZ Belatedly

@user APL uses * for power :P

user

7:37 PM

I'll stop it once I get near 5000

@ChartZBelatedly ⍨

ChartZ Belatedly

@user I just use the criteria that I'll award the bounty when doing so won't make me drop down a privilege level

@user Try × :P

Redwolf Programs

@user 1809251394333065553493296640760748560207343510400633813116524750123642650624 × 10 * 750

That's what 2000 * 250 would be :p

user

@ChartZBelatedly That makes sense, i just did that

ChartZ Belatedly

@RedwolfPrograms I feel like if you're going to write in scientific notation, you gotta fully commit :P

user

@ChartZBelatedly I know, I was joking about *

ChartZ Belatedly

7:39 PM

@user Just being safe/helpful :)

Redwolf Programs

1.8092513943330655534932966407607485602073435104006338131165247501236426506240000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000…

rak1507

how come this question codegolf.stackexchange.com/questions/151678/… doesn't appear in this query data.stackexchange.com/codegolf/query/1156913/…

user

@ChartZBelatedly Thanks :P

@RedwolfPrograms Why all the zeroes near the end?

Redwolf Programs

I added a little floating point error near the end, because it's too easy otherwise

user

@RedwolfPrograms Then what's the 1 for?

It would be a whole lot shorter without it :P

Redwolf Programs

7:48 PM

Well otherwise I could remove the zeroes :p

user

Not very golfy at all

My language could do it in 1 byte: 2 :)

Redwolf Programs

The empty program in my golfing language takes advantage of speculative execution to read the memory of other processes, finds what pages are open in the web browser, looks for CGCC, and automatically uses a neural network to determine how to solve the problem, then proceeds to do so.

With jQuery, of course.

3

ChartZ Belatedly

@RedwolfPrograms Sorry, that violates a standard loophole

:P

user

@ChartZBelatedly ?

ChartZ Belatedly

@user No web access :P

Redwolf Programs

7:52 PM

It doesn't access the web, just the RAM allocated to other processes that happen to have used the web :p

user

How about instead of accessing the web, it just deploys a physical robot to go to the OP's house and force them to change the question's rules to allow the empty program and then accept your answer?

Redwolf Programs

My language's interpreter is named Harold. Harold comes to your house. He asks you what you would like to do. Harold does that, then hands you a punched card and leaves. Harold is zero bytes long. You can summon Harold by downloading the interpreter from my Github.

user

8:11 PM

@RedwolfPrograms Nice language, but I'm afraid your interpreter is too hard to use. My language's interpreter is named Cthulhu. You can summon Cthulhu by...well, it's a little too easy to do it, so I'd rather not share that here :P

Okay, here is the graduation script without the green redesign. I think all the non-theme-related features still work, but let me know if something's wrong, so I can shrug and not do anything about it. Also, if I'm supposed to edit the header or something, let me know (I will edit the header if it's wrong, of course).

Lyxal

9:33 PM

Hey so y'all know how you were saying there was nothing stopping anyone from using all of Unicode to answer the latest answer chaining challenge?

There wasn't

rak1507

lmao

Lyxal

The score isn't as high as I had imagined, but I'm still happy with my effort

Took me a whole hour to get it working

ChartZ Belatedly

9:46 PM

I'm more proud of this answer, done in my second least favourite language I've made, than I am of a good number of my Jelly answers ಠ_ಠ

Lyxal

@ChartZBelatedly that's good, but I need you to tell me that again in two hours

I'm out of votes till then

ChartZ Belatedly

There's rep on the line? Oh, I'll be reminding you :P

Lyxal

I want to upvote but I can't

Very sad

ChartZ Belatedly

@Lyxal Quite. Very indeededly :P

New Main Posts

10:44 PM

0

Q: Subarrays With At Least N Distinct Integers

Given a sequence of integers and an integer N, output the number of contiguous subsequences that contain at least N distinct integers. Each integer in the sequence is non-negative and will not be larger than the size of the sequence. For example, with the sequence 1,2,2,3 and N=2, there are 5 co...

code-golf array-manipulation restricted-complexity

Redwolf Programs

Okay so my new KoTH is going to be very complicated

Bubbler

@rak1507 That SEDE query is meant to produce questions that strictly meet the bounty criteria AND are more likely to fit my taste better, so it is somewhat expected to filter out some valid questions.

Redwolf Programs

Do y'all think it would be fine to have an overview of the challenge, with links under each section to a gist with much more detail?

Bubbler

@Bubbler But that question seems to fit the criteria though, so I'll need to investigate

@RedwolfPrograms Sounds like it'll violate the self-contained rule

user202729

I know I don't need to care about it, but some close voters are are weird.

2 days ago, by user202729

This site is not for the same purpose as Stack Overflow. It's for people to have fun.

I don't have that much time. But chat.stackexchange.com/search?q=Q&user=-363&room=240 is a list of all questions that stays on main long enough for the bot to notice.

Redwolf Programs

10:53 PM

My reasoning for doing it is that the contents of the CGCC post would be enough to make a bot and answer the challenge, but the extra detail that can be used to make really fine tuned, specialized bots can be found on a gist owned and maintained by me. The other option would probably be to omit a lot of detail, which seems much worse.

It seems like requiring challenges to be self contained is mostly because being required to go to another site to answer or understand the challenge is bad, and also links could be unreliable. But both of those don't seem like as big of concerns here.

I guess there could be situations where people can't access github but can access CGCC, but in that case they could probably just ask in chat for a copy of whatever section they need through some other method

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Syslog PRI Conversion This is my first CodeGolf post, so I expect some errors my content. The rsyslogd utility has been a tool used throughout time to handle and parse logs either over an IP network or even locally. As many of you might know, this tool utilizes the basic syslog protocol. The sy...

ChartZ Belatedly

11:13 PM

@RedwolfPrograms So long as the challenge body on CGCC is clear, I see no problem with including some links to "Here's some tips" pages if you want to

Bubbler

@rak1507 I just confirmed that it does appear in the query. It appears as answer count 3, score 12

rak1507

oh, sorry, my bad, I searched for it with ctrl f but it must only load certain bits at a time

Bubbler

Yeah, it takes some time for Ctrl+F to grab the contents in the result

Bubbler

11:37 PM

Any feedback for this and this? (Now with complete test cases for both)

Redwolf Programs

Both look good

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Tri tri tribonacci From Wikipedia: The tribonacci numbers are like the Fibonacci numbers, but instead of starting with two predetermined terms, the sequence starts with three predetermined terms and each term afterwards is the sum of the preceding three terms. Given three arrays of three intege...

Redwolf Programs

Definitely a duplicate

Hmm, seems there isn't actually anything super close to this one. Not sure if it's different enough from fibonacci to be different, though.

Oh wait it's not just plain tribonacci

Bubbler

11:55 PM

And we don't even have a plain tribonacci yet.

Redwolf Programs

Actually might be an interesting challenge then

Tfw every flag reason is valid for a post :p

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