The Nineteenth Byte - 2017-04-25 (page 2 of 4)

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5:00 AM

OK, maybe not the best example.

4

A: Shortest Longest Common Subsequence Code

CJam, 31 q~L{_:&\f{_2$f#:).>j+}{,}$W>s}j Try it online 9 bytes golfed thanks to Dennis! Explanation: This algorithm tries every possible character for the first position of the subsequence, replaces each string with the substring after the first occurrence of that character, and then calls ...

@WheatWizard well there are some challenges which are outright impossible, e.g. "count from 10 down to 1, waiting a second between each output" (Brain-Flak has no time-related builtins)

That is true, even the truth machine is impossible

Just so you know, the "guess the program" one was written in Hi\n.

oh, so the program was actually keyboard mashing? that makes sense, it didn't look random

It actually was random. It was generated by a CJam program I wrote, but I just forgot to remove my debug, so the string was quoted by accident.

Anonymous

5:13 AM

What kind of device do you usually use for chat?

I think it would be difficult to type C\8|8 by keyboard mashing (relevant xkcd)

I use my smart TV for chat

Anonymous

@betseg Does that use the desktop or mobile chat interface?

I was joking :(

Mobile, but with the desktop interface

Since the mobile interface borks for me

5:19 AM

I chat using my car-mounted A.I., of course. Who doesn't?

I don't. I use my smart TV.

My chat interface is Python requests.

I'm actually a spambot who decided he hated spam.

Yup. We've gone full xkcd.

I rigged up an irc client to connect to ChatExchange

Anyone uses the mobile app instead of the site?

5:24 AM

@betseg well i use mobile when i can't access the computer

^

>

Whoops, infinite loop

@LeakyNun me too, but I asked about that time period. App or site?

@Challenger5 what have you done

@betseg Exactly the point of befunge - it's hard to do static analysis. What have I done?

5:38 AM

iirc the point of Befunge was to be a PITA to compile.

@WheatWizard this swaps the stack in Wise, as long as there are no 0s in it.

I'm pretty sure one can shave off a couple bytes, but it works

Also, how can I add to the wiki? I forked the project on github, but the wiki doesn't seem to transfer...

1

Q: Snooker scoring

I was watching the world snooker championship and I got me wondering.. Snooker scoring In the game of snooker there are certain rules that you must adhere too: When there are red balls on the table, during your turn you must first pot a red ball After each red ball, you must pot a colored bal...

Phew I just wrote a longish explanation for my answer, if there's anything that seems confusing please tell me

ClojureScript?

Isn't it just Clojure?

@Phoenix Nope

It's slightly different, Clojure compiles to Java, whereas ClojureScript compiles to JS

It's basically Clojure for the web

5:45 AM

Was there a particular reason that you chose ClojureScript?

@Phoenix In some cases it's golfier than Clojure, because CLJS is based off JS

I chose it for that reason

And because it's a lisp, which makes it infinitely cooler

Your answer doesn't seem to implement any fancy builtins and such.

@Phoenix (int (apply str ...)) turns an array of integers into a number, that's cool

In other languages it would probably be harder

Regular Clojure doesn't have that?

I would love golfing suggestions, if you have any BTW

@Phoenix It kind of has that, except int would have to be replaced by read-string

5:50 AM

Wait, your solution doesn't have (int (apply str ...))

@MistahFiggins Actually, the part in the loop reverses the stack that is before the last 0 and after the last 0, but the first part just puts 2 0s at the beginning

@Phoenix It technically does, it's just split over two parts

I see.

@MistahFiggins except for the top of the stack

@Phoenix Wait did you change your name

5:52 AM

that will be directly after the last 0

@Qwerp-Derp I think he was pavel

Yes

@MistahFiggins That's what I suspected after seeing their profile

And my suspicions were confirmed

Plz stop changing names weekly

I don't

Not just you

5:54 AM

I can change back

1

Q: Found the answer myself for one of my questions - how to award bounty?

Yesterday I started a bounty for a question I posted on Stack Overflow. I received a couple of answers, none of them solved my problem, but one of them gave suggestions that pushed me in the right direction, leading me to eventually find the answer myself. I posted the answer myself to my quest...

discussion bounty self-answer

halp

@betseg I stopped and I'm keeping my name as Mendeleev until at least 2018

Anonymous

@Mendeleev I'll hold you to that

I've mentioned it a few times before

@betseg Welcome to the "Not-Changing-Names" club

Apr 14 at 19:15, by Mendeleev

This is my final username for a while (i.e. I will avoid changing it until 2018 at least)

5:57 AM

@Mego do you have any good questions? Pyth seems to be inactive these days

Anonymous

@LeakyNun I've been in an inspirational rut lately for challenges

@Mego I don't necessarily mean challenges from you

Anonymous

TBH I haven't been keeping up with recent challenges very well. My nose has been buried in code.

31

Q: Generate Pyramid Scheme code

Pyramid Scheme is a language being developed by @ConorO'Brien. In Pyramid Scheme, the code that you write looks like this: ^ ^ / \ /3\ / \ --- / + \ ^-------^ /9\ /3\ /123\ --- ----- Now, that code has two obvious qualities: It's difficult to ...

code-golf ascii-art parsing

@Phoenix seems interesting

6:03 AM

Also difficult

If you want something easier, you can try codegolf.stackexchange.com/questions/111758/disconnect-4-bits

oh that's easy

Restricted source

oh, never mind

Lol

Though a Pyth solution exists, score 41.

There's only one penalty-free solution, you can change that.

6:11 AM

lol my current code has 8 penalties

Still better than Java

now 12+40 = 52

That's not much worse than the leading pyth answer.

11+30 = 41

now it's equal

Cool!

6:33 AM

14+20 = 34

I should probably sleep... I'll see how you did tomorrow.

@LeakyNun :O I just realized you're back

@ASCII-only hi

@Mego Mobile, since I have a nasty habit of using chat at all times even when I'm busy.

@DJMcMayhem "even" is a strange way to spell "especially"

7:09 AM

user image

"What? The seat is empty?!"

(ps i took the photo)

Anonymous

Some context would be nice

^

It looks like :O

Ooh I see it now

Anonymous

I've been having the weirdest problem for the last week that had the stupidest cause

Anonymous

7:16 AM

Every so often, my computer would completely freeze up. After about a minute, it would unfreeze, drop my internet connection and show my wifi adapter as disabled, then the adapter would come back and reconnect.

Wow

Anonymous

I finally solved the problem: my computer's power settings had "allow computer to power off USB devices" enabled. My wifi adapter is a USB adapter.

Lol

Anonymous

It's completely ridiculous that having that one option (unintentionally) enabled can completely lock up my computer

Anonymous

Apparently it's a common problem with AMD chipsets

7:19 AM

I've been having almost the same problem

Except my computer crashed fully

My solution was reinstalling the OS.

2 hours later…

9:35 AM

Is it possible to find something like a parser generator, but instead of giving you some code for a particular language X, it returns something like a list of the 'primitive operations' the parser should perform?

unclear

I want a parser generator that lets me generate the parser code in an arbitrary language.

So, you want to generate the language from the language?

What

10:10 AM

@feersum maybe?

UniCC is technically a target language independent parser generator, which means that it is not bound to a special programming language. Currently, only support of the C programming language is given due the UniCC Standard C Parser Template.

That's nice

Now I just need to find one I can use in Python.

Apparently that one is in C, so I could use it in Python if I wanted to badly enough.

Anonymous

SWIG it up :P

I'm too lazy for SWIG, I would probably just ctypes haha

0

Q: some question on something it is not clear to me

What does it mean "Standard loopholes"? What does it mean "Quality standard"? All Your micro languages have something can not be ok... What do you think the automatic choose of function, based on return type and overload, choose in the case of error found? f(g(a)) g mistakes computation and it ...

10:33 AM

@Riker So many cute cats

Riker you better watch out, I may or may not hunt you down and take your cats

@NewMetaPosts I'm trying to understand what's being asked here, without much success

Anonymous

@Qwerp-Derp All of that user's posts on meta are confusing, poorly-worded, rambling rants about site policies.

@Mego I wholeheartedly agree

Anonymous

I could sympathize if the problem was just that they weren't a native English speaker. But there is a clear difference between translation difficulties and whatever that is. It reads like a stream of consciousness.

I honestly have no idea what's being asked because (if I'm going to be perfectly honest) the English is really bad. It just seems like a stream of words as opposed to sentences.

@Geobits Teach me the ways of punning

10:42 AM

the worst computer program behavior...

computers are obviously naughty and must be punished

@Qwerp-Derp It's easy. Just build up your vocabulary and wit, and they come naturally :D

Anonymous

@Qwerp-Derp It's not even the English being bad that's a problem. I can read broken English with only minor difficulties. It's the missing logical progression of thoughts that makes it unreadable.

Yeah, and like you said, it's all of them, not just this post.

Anonymous

It's a consistent problem with this user

@Mego The words don't make sense, and the "sentences" don't make sense

Anonymous

10:44 AM

If I wasn't the type of person to give the benefit of the doubt, I'd suspect the posts were generated via Markov chains.

I can pretty much grasp the first paragraph, given that a couple assumptions I'm making are true. The second... no clue.

I thought he was complaining that his challenge got closed, but after the first two sentences I don't think that's the case

@Mego Is there an internet law similar to Poe's regarding this? :P

@NewMetaPosts That looks like something Zalgo would output

Anonymous

@Geobits If there isn't, dibs on having it named after me

10:48 AM

Mego's Law? I like it.

I wouldn't want it named after me anyway, because it seems nobody can correctly apostrophe Geobits.

Factor seems like a cool language

Anonymous

Mego's Law: As the number of participants in a conversation increases, the probability that at least one participant's output is word salad increases.

11

Does anyone here know any Factor? I might want to learn it

I know how to factor, but not how to Factor. Maybe Bill O'Reilly can help?

@Qwerp-Derp link?

10:52 AM

@Mego Fine. Have a star.

Anonymous

Challenge idea: classification test-battery decision-problem Given a string, decide whether it is real speech or word salad.

Difficulty for humans: Hard. Difficulty for robots: 15 years R&D.

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Multipolyquine quine polyglot Your task is to write a quine. The quine that runs successfully, according to our standard quine rules, in the most languages wins.

Anonymous

Better version: use TNB messages for a Markov chain word salad generator. The challenge could be whether the string is a TNB message or word salad.

C# is stupid

I spent 30 minutes trying to debug a bug caused because I'm in France >_>

10:59 AM

sure it's the C# to blame...

That's cute

There is a problem called the Turkish problem

C# floats are localized, and in French decimal numbers use commas

@Mego So.... I should get Marky out?

Not a Markov chain, but salad-y enough most of the time.

@TuxCopter They're localized in almost all langs

Czechs do that too

11:01 AM

We do it too

I'm glad we don't use chevrons for quotations

Anonymous

@Geobits Haha, Marky could be the source of the word salad, and the challenge could be Marky or Not?

We took decimal commas from you, and I blame the French for the Turkish problem :p

@Mego if you manage to get a decent solution to the challenge, please leave a memo in the Charcoal room. We could use your services.

Anonymous

@JanDvorak Lol, you guys already have my flags :P

11:03 AM

Not just the Charcoal room, but the internet as a whole would thank you.

It could give rise to a new version of Captcha, more annoying but also vastly more useful.

I kinda like the newer "just click the checkbox" kind. Has it been widely broken yet?

Anonymous

@Geobits Not that I'm aware of. If anything, it gets a lot of false positives.

> to prove you are a human, please write a short sentence in English.
> I <3 U, Google!!!11!1
> I'm sorry, that does not appear to be a valid English sentence. Please retry.

my solution:

> to prove you are a human, please write a short sentence in English.

11:18 AM

> To prove you are a human, please write a short (approx 500 word) essay debating the pros and cons of <insert topic here>

That's how you sort out the salad.

Well, and piss people off enough to not come back.

win-win

If they pass, they're either pliable humans or smart robots. Win-win indeed.

:-D

> to prove you are a human, please write a short sentence in English.
to prove you are a human, please write a short sentence in English.

> go

that's a valid sentence

Erik the Outgolfer

12:07 PM

When I read Jelly code, I can guess who wrote it.

user165474

To prove you are a human, please read the following:

A) Statement B is true
B) Statement A is false

Upon reading these, make a logical conclusion. If the paradox breaks your code, then you are not a human.

×€Ð€S€€Z ZWẋ;@³W¤Ṗç/

@EriktheOutgolfer who wrote this?

(The space is a newline)

@HyperNeutrino I'm a human and it broke my code anyways

user165474

Oh :(

@JanDvorak Are you sure you're a human? ;)

12:09 PM

My genetic code, that is

Erik the Outgolfer

@LeakyNun Special case here (actually looks like my code-writing tendencies), so I pick Dennis.

@EriktheOutgolfer I wrote this

Erik the Outgolfer

Oh, I didn't know you do Jelly!

@LeakyNun He just said he could guess. Not guess right.

@EriktheOutgolfer I posted 77 Jelly answers

@Geobits never expected 100% accuracy.

Erik the Outgolfer

12:11 PM

@Geobits Yeah, I've actually done this multiple times when seeing Jelly code before seeing the poster.

user165474

What does the code do?

1

A: Find the Matrix Power

Jelly, 20 bytes ×€Ð€S€€Z ZWẋ;@³W¤Ṗç/

Erik the Outgolfer

ninja'd :(

user165474

Ooh cool

Erik the Outgolfer

Who wrote this code?

“4ṘƝ;þ¦Ɱ’b®¤ị
;⁶x14©¤s®ṖÇ€

12:16 PM

looks like line noise

@HyperNeutrino test cases should be valid inputs really - it implies necessary coverage.

That jelly code has 5 boxes

user165474

@JonathanAllan Should I just simply delete it then?

@EriktheOutgolfer I have no idea

@HyperNeutrino up to you, just might confuse someone.

Erik the Outgolfer

12:17 PM

@LeakyNun It has specific patterns that pertain to a specific user.

user165474

Alright. I'll just take it out then.

@betseg install better fonts :)

@EriktheOutgolfer sure, but that doesn't mean I can recognize it

Erik the Outgolfer

You haven't got enough experience reading others' Jelly answers then :)

@JonathanAllan can't on mobile

user165474

12:19 PM

I should learn Jelly sometime.

@HyperNeutrino why not now?

Me too

Erik the Outgolfer

Yeah you should.

user165474

True.

@betseg why not now?

user165474

12:19 PM

I need a simple programming task to try to do

user165474

Addition :D

@LeakyNun Am in hospital :'(

user165474

Nah, probably too easy...

@EriktheOutgolfer hmm Ɱ isn't a used byte :/

@JonathanAllan maybe some old version

@betseg take care then

Erik the Outgolfer

12:20 PM

No Ɱ is part of string literal syntax, so it doesn't count.

@LeakyNun I dont think so.

@LeakyNun ty

Ah >_< it's in a string literal

@HyperNeutrino try to generate a+a*b given left input a and right input b (the inputs are the arguments)

Erik the Outgolfer

@HyperNeutrino You can do it in 1 byte.

user165474

12:21 PM

Alright, I'll try to do it in as many bytes as I need first, then try to get the one-byte version.

Erik the Outgolfer

You can't in 1 byte.

@HyperNeutrino here is your template. It contains no spoiler. 15 should be your output. 2 bytes are needed.

user165474

Alright. Thanks.

@EriktheOutgolfer what was your username when I left?

Erik the Outgolfer

"Erik the Golfer" in smallcaps.

12:22 PM

I see

Erik the Outgolfer

I was suspended then :(

what for?

Erik the Outgolfer

immaturity

heh

I suppose we all have that

user165474

+×

12:23 PM

@HyperNeutrino nice

Erik the Outgolfer

@HyperNeutrino Congratulations!

user165474

\o/

user165474

First Jelly program :D

@HyperNeutrino try to do Fibonacci without the built-in

@LeakyNun APL, 7 bytes: {α+α×ω}

Was a pita on mobile

12:24 PM

The built-in is ÆḞ for your reference @HyperNeutrino

user165474

Ooh okay. Thanks.

user165474

So given X, find the X-th fibonacci number?

Erik the Outgolfer

Yeah, I suppose.

basically.

The answer should be 4 bytes, @EriktheOutgolfer right?

user165474

Oh wait ÆḞ takes the argument, not the input?

Erik the Outgolfer

12:28 PM

Jelly uses command-line arguments by default.

user165474

Okay.

@HyperNeutrino honestly, I don't expect you to be able to do it in 4 bytes

user165474

Me neither :D

user165474

Am I supposed to do this in the recursive method?

Erik the Outgolfer

@LeakyNun I don't think anybody can do it in 4 bytes or less, without ÆḞ.

12:29 PM

@EriktheOutgolfer I did it in 4 bytes. (but obviously it isn't me who came up with the code)

@HyperNeutrino I suppose so

user165474

Alright.

user165474

Either that or the method with the Golden Ratio

Pretty proud I found the 4 byte version despite not knowing Jelly :)

user165474

Can someone give me a hint? I can't seem to figure out where to start.

user165474

rip

12:34 PM

@Emigna how?

@HyperNeutrino you already know the essential components... you just have to arrange them till it works

I probably shouldn't post it if Hyper wants to solve it himself

@Emigna no, I mean how you found it

?

ah

user165474

I shouldn't be looking in the dyads section since I only have 1 argument :P

Erik the Outgolfer

That's not a reason not to look in the dyads section.

user165474

12:36 PM

wait, true.

It's easy to figure out the 2 basic components from knowing the recursive method. Then I just needed to figure out how to seed the start values

@HyperNeutrino take ^ as a hint

user165474

Alright. Thanks @Emigna

@HyperNeutrino oh, and a more straight-forward method I just tried has 10 bytes

user165474

Alright.

12:38 PM

I've tried to write a Jelly program before using 1 of these components and failed. It seems weird to me that this actually works so I don't really have the correct thinking for Jelly it seems :)

user165474

So pretty much I want to have two variables, then add them, move the sum to the second and the second to the first. (Maybe overthinking this?)

@HyperNeutrino tell me the 4 essential components

user165474

sum? i think that's one of them @LeakyNun

removing 1 byte turns it into the Les Marvin sequence which is kind of interesting.

@HyperNeutrino yes it is

user165474

12:43 PM

Alright.

user165474

Hmm.

but there is + which sums two numbers and S which sums a list

If anyone on knows Factor: why can't I do this?

: decr ( in -- out )
  1 - ;
: pow ( base power -- final )
  {
    { [ zero? ] [ 1 ] }
    [ dupd decr pow * ]
  } cond ;

@Qwerp-Derp can you provide a link to Factor?

user165474

Is iteration another of the essential components?

12:44 PM

@LeakyNun factorcode.org

@HyperNeutrino yes

It's a weird language, to say the least

user165474

So summation, and iteration. Hm.

user165474

2 more.

@LeakyNun You got the link?

12:47 PM

@Qwerp-Derp you sent me it

user165474

Let me see how I'd do it with Python or Java (my main languages), and see if I can find the other two.

0

Q: Factorials and never ending cycles!

As you may know it, the factorial of a positive integer n is the product of all the positive integers which are equal or smaller to n. For instance : 6! = 6*5*4*3*2*1 = 720. 0! = 1. We will now define a special operation with an irrelevant name like sumFac: Given a positive integer n, sumF...

code-golf math number sequence factorial

user165474

1 def fib(i):
2   a = 0
3   b = 1
4   c = 0
5   for j in range(i):
6       c = a + b
7       a = b
8       b = c
9   return a

Clojure is much easier to wrap my head around than Factor...

This is both a good thing (it's a challenge) and a bad thing (it's super annoying) about Factor

user165474

Summation in line 6

user165474

12:51 PM

Iteration in line 5 (6 7 8)

user165474

@LeakyNun Does the third (or fourth) essential component have to do with initializing those two variables?

Yes

1 def fib(i):
2   a = 0
3   b = 1
4   for j in range(i):
5       a, b = b, a+b
6   return a

user165474

Yay \o/

user165474

Oh.

user165474

lol Okay

user165474

12:53 PM

The only thing I see left is the return statement on line 6

Jelly has implicit return, so it isn't essential

You already have 4 components

user165474

Summation, initialization, iteration?

two initializations

user165474

...oh

user165474

*facepalm*

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The Nineteenth Byte

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