The Nineteenth Byte

Leaky Nun

16:00

@Mr.Xcoder nice

Mr. Xcoder

Can >Q1 be >1?

To switch to implicit Q at the end?

Leaky Nun

@Mr.Xcoder see my comment

Mr. Xcoder

It actually becomes t.

@LeakyNun That means Pyth ties your Jelly solution :P

TheLethalCoder

@Cowsquack Will you be updating: kritixilithos.github.io/Carrot and the wiki? (I haven't checked yet :P)

musicman523

@EriktheOutgolfer Checking now, based on what we've said in the comments I think you're fine

Cows quack

16:06

@TheLethalCoder I will once I complete the rewrite. I've got the parser (AST and stuff) and the interpreter remaining now.

Erik the Outgolfer

@musicman523 okay :)

musicman523

@EriktheOutgolfer For an input of 1 your code returns 0, should be 3 with one-indexing

Cows quack

If you are talking about the lexer and the changes in syntax

TheLethalCoder

@Cowsquack Righto, let me know if you want me to test anything.

Cows quack

:D Thanks

Mr. Xcoder

16:07

@LeakyNun Now I wish y worked for Strings :p

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Title: Professor Propsters' Garden Fence Although I'm fairly new to PPCG, I had this nice idea for a cops-and-robbers game. Although it may take some time to read the suggestion, please take some time to improve the challenge as I have zero experience with this! Thank you. Description: Profess...

Erik the Outgolfer

@musicman523 jeez I guess I need to append two zeroes

musicman523

@EriktheOutgolfer that may not work for the inputs that don't have a second zero

Erik the Outgolfer

@musicman523 no I have already handled that case I only take the 32 least significant bits

musicman523

okay sounds good

Erik the Outgolfer

16:12

@musicman523 added another 2 bytes

musicman523

@EriktheOutgolfer 11 gives 4, should be 5

Erik the Outgolfer

@musicman523 that's what you get for using bitwise not instead of mapped logical not...fixed at no cost

(darn)

oh yeah I forgot jelly doesn't have native twos complement *facepalm*

caird coinheringaahing

16:28

I'm creating a language where the arity of a command depends on the next value (as a number) but I can't think of a name. Does anyone have any suggestions?

Jan Dvorak

Aritana

Step Hen

@cairdcoinheringaahing Desert

caird coinheringaahing

@StepHen why?

Step Hen

@cairdcoinheringaahing I'm not actually sure, but arity made me think of that - I thought it meant something related but a google search brings up nothing, I might have made it up

oh wait I know why, arid

Jan Dvorak

pun on aridity, yeah

caird coinheringaahing

16:30

@Step I kinda like it

Obligitory strawpoll

Mr. Xcoder

@cairdcoinheringaahing I chose "other": Arritybot

Cows quack

@cairdcoinheringaahing Dessert

Jan Dvorak

That's a sweet idea

Mr. Xcoder

2 votes although there are 6 active users in the room :(

Step Hen

@cairdcoinheringaahing nullarity

Mr. Xcoder

16:37

Or Atrion

Dennis

@CensoredUsername Tell that to C.

Mr. Xcoder

@Dennis Are you talking about rand()?

That only depends on the program's first run?

Dennis

And its crappy implementations.

glibc uses a lagged Fibonacci generator. Very random...

caird coinheringaahing

So instead of helping me narrow down names, I now have 6 different names with votes on them. Great!

Step Hen

@WheatWizard I only saw half the rep from my Taxi answer, although I think that was a break from the norm of HNQ answers that get lots of rep (as in it took a lot of work and wasn't a FGITW)

New Main Posts

16:40

1

Q: Triple-balanced numbers!

Description We consider an integer with at least 3 digits triple-balanced if, when split in three parts, the digits in every part sum up to the same number. We split numbers as follows: abcdefghi - Standard case: the number of digits is divisable through 3: abc def ghi abcdefgh - Number % 3 ==...

Downgoat

Huh apparently it is commonly thought that Apple is the one that chooses emojis :P

Mr. Xcoder

@Downgoat Unlike Samsung, Apple has uncrappy emojis

Business Cat

They're both pretty awful

Mr. Xcoder

@BusinessCat <insert look of disapproval>

caird coinheringaahing

Followup strawpoll

totallyhuman

16:52

all emoji are awful

😂

Step Hen

@totallyhuman 11 days until the Emoji Movie comes out

totallyhuman

chaos shall ensue

Mr. Xcoder

@cairdcoinheringaahing I will summon Cthulhu in Desert, then

Step Hen

@Mr.Xcoder NewSandboxPosts: #Summon Cthulhu popularity-contest

Mr. Xcoder

@StepHen I consider popularity-contests the most off-topic things here on PPCG

Downgoat

16:55

@StepHen ... wtf 4 billion years of evolution and what we have to show for that is an Emoji Movie" 🐐🔫

Step Hen

@Mr.Xcoder popcon is the new code-trolling/underhanded

totallyhuman

they said as they used emoji :P

Mr. Xcoder

@StepHen Unlike pop-cons, I like underhanded challenges (to my shame)

totallyhuman

you know what would've made a great underhanded challenge?

rickroll the user

Business Cat

Popcons can be good. What's bad about popcons is people think it means "do X in the most creative way possible"

caird coinheringaahing

16:57

@totallyhuman I think that happened

totallyhuman

not as an underhanded challenge

caird coinheringaahing

@totallyhuman try posting it. This was well received and is recent

totallyhuman

well received? it's closed

caird coinheringaahing

youll get votes but it's guaranteed to be closed

Mr. Xcoder

@cairdcoinheringaahing 8 upvotes ≠ Well received

totallyhuman

17:00

it has 7 downvotes

caird coinheringaahing

@totallyhuman because it's underhanded

Step Hen

New challenges of the type previously posted under this tag are not welcome.

totallyhuman

exactly why i won't make one :P

caird coinheringaahing

i don't know why I'm defending underhanded; I hate them

New Main Posts

2

Q: Is it a turtle prime?

As we all know, it's turtles all the way down. But is it primes all the way down too? A number is considered a "turtle-prime" if it satisfies the following conditions: 1) It is prime. 2) It is possible to remove a single digit leaving a prime number. 3) Step 2 can be repeated until left with a ...

code-golf primes

Mr. Xcoder

17:05

@totallyhuman

> Can we take input as a list of digits?

totallyhuman

yes?

Mr. Xcoder

Are you planning to solve it in Pyth?

totallyhuman

no

i don't know pyth

Mr. Xcoder

ok

Just asking

I think someone will come up with a good math formula for this‌, and then all are going to port it.

Downgoat

@BusinessCat they can be but the last (non-closed) popcon with code was over a year ago:

90

Q: Patch the Image

In a popular image editing software there is a feature, that patches (The term used in image processing is inpainting as @mınxomaτ pointed out.) a selected area of an image, based on the information outside of that patch. And it does a quite good job, considering it is just a program. As a human,...

Leaky Nun

17:10

@Mr.Xcoder there is another

Business Cat

70

Q: Write a Programming language of Unknown Completeness

Determining whether a Language is Turing Complete is very important when designing a language. It is a also a pretty difficult task for a lot of esoteric programming languages to begin with, but lets kick it up a notch. Lets make some programming languages that are so hard to prove Turing Compl...

popularity-contest language-design

Actually it's that one ^

Leaky Nun

3

A: Randomly select a character, plinko-style

Jelly, 6 bytes Ḋṁ7;ḢX A monadic link taking a list of four characters and returning one with the probability distribution described. Try it online! How? Ḋṁ7;ḢX - Link: list of characters, s e.g. ABCD Ḋ - dequeue s BCD ṁ7 - mould like 7 (implicit range) ...

LegionMammal978

lol

Mr. Xcoder

> your Jelly solution

LegionMammal978

Was playing Factorio with an enemy AI overlay enabled:

totallyhuman

17:10

wait don't you have to just check of each digit is prime?

Business Cat

Oh, (with code), nevermind

Mr. Xcoder

@totallyhuman No

totallyhuman

oh nvm

Mr. Xcoder

239, 9 ain't prime.

LegionMammal978

Ah, dang it, didn't screenshot properly

Wait, no, found it

Downgoat

17:12

@BusinessCat you missed the "with code" part of my sentence

For that you just need to design a programming language

Mr. Xcoder

yesterday, by Cows quack

give it time

totallyhuman

emit it evig

LegionMammal978

Downgoat

Helkas pop-con violates our rules but he's a high rep user

Mr. Xcoder

@Cowsquack It updated today, at 17:00 UTC, >20 hours after I changed it

Jan Dvorak

17:14

@LegionMammal978 now that's what I call spaghetti code

LegionMammal978

@JanDvorak More like spaghetti targeting :P

totallyhuman

not ravioli code?

Jan Dvorak

almost makes me hungry

totallyhuman

chat.stackexchange.com/transcript/240?m=38789561#38789561 curse you oneboxes

Mr. Xcoder

VTR this

dzaima

17:21

SOGLs compressor:

262 bytes, original was 603 bytes. 43% of original length
More precisely, Infinity bytes

totallyhuman

wat

dzaima

I was lazy and used javas Math.log(double) for the precisity :p

where the double is ~ 10^(outputLength*log(256))

New Main Posts

-1

Q: Chess Championship

Assuming that the king starts on some square of an infinite chessboard. In the puzzle of chess, the king can move to any neighbouring square horizontally, vertically, or diagonally. In this puzzle, the king takes one move extra after n number of moves. You have to find that in how many different ...

c c++

totallyhuman

17:39

> It outputs (-inf+nanj) if there isn't the second zero. I guess that makes some sense.

Mr. Xcoder

17:52

Yaay, found an alternative solution to my existing Pyth answer on Randomly selecy a character...: O+@Q1t*2

Maybe I can golf this one further

Dennis

@totallyhuman tio.run/##K6gsycjPM/6fVpSfq5Ccm1iSoZCZW5BfVKKQk5/…

totallyhuman

lovely number, isn't it

Dennis

And it does make sense, since 2**-inf gives 0.

Phoenix

What's a nanj?

totallyhuman

j is python's representation of $i$

Phoenix

17:59

Is $i$ Imaginary i?

Mr. Xcoder

@Dennis Shouldn't 2^(-inf) (in math) be 1/2^inf?

@Phoenix Yes

totallyhuman

and nan is... not a number

Dennis

@Phoenix nanj means the imaginary part is ill-defined.

Mr. Xcoder

not-a-number-imaginary-part...

Dennis

@Mr.Xcoder Yes, and 1/inf is 0.

Phoenix

18:00

(-inf+nanj) is a terrible number.

DJMcMayhem

Does anyone have more thoughts on this, or do you think it is ready for posting?

Downgoat

Would you agree "Is this string prime" be a dupe of the main Primality Checking challenge?

Phoenix

No

Mr. Xcoder

@Downgoat No

totallyhuman

negative infinity plus not a number imaginary units

Downgoat

18:01

I mean unlike wrapper challenge it is exactly the same + boilerplate

@Phoenix why?

the thing is I just need to find the language built ins for .charcode and .every

you can't even golf beyond the primality part

Phoenix

Not every lanuage has a .every

Mr. Xcoder

You must convert all the characterts to their ASCII values. You must check if all are prime

Downgoat

@Phoenix so its an 'implement' .every challenge?

Phoenix

I didn't say it's a good challenge.

Just not a duplicate.

Downgoat

@Mr.Xcoder I'm 99% sure 0 answers will implement the conversion. though it would still be a dupe

totallyhuman

18:02

cmc: output the ascii ordinal numbers of the input in brainfuck

Downgoat

dupe means you can trivially convert between the callenges

Mr. Xcoder

@Downgoat Trivially?

Downgoat

@totallyhuman 1 byte: .

DJMcMayhem

@Downgoat I agree, but not enough to hammer it myself

Downgoat

@Mr.Xcoder you just wrap answer from primality checking challenge in .charCodes.every

totallyhuman

18:03

@Downgoat the ordinal numbers :P

Downgoat

If I was posting JS answer that is exactly what I would do

@totallyhuman ok so this is stringify an integer challenge then?

Mr. Xcoder

@Downgoat The most trivial part is primality checking.

DJMcMayhem

@Mr.Xcoder That's not true.

Downgoat

no it's the .charCodes.every(...) wrapper than you can apply to primality checking part

totallyhuman

hello -> 104 101 108 108 111

DJMcMayhem

18:04

Primality testing and checking if x applies to every character are equally trivial in golflangs, and in every other language, the primality testing is the less trivial part

Mr. Xcoder

@Downgoat You say most of the languages have those built-ins, but primality checking does not have a built-in in the languages .charCodes and .every exist??

Sorry, but I disagree. Please hammer-dupe it though, because I want to leave that challenge anyway.

totallyhuman

wut

why though?

Mr. Xcoder

@totallyhuman I tried to delete it ever since the very first answer was posted, but unfortunately that got an upvote and I personally think it's unfair to the answerer.

totallyhuman

again, why?

Mr. Xcoder

@totallyhuman Because it's poorly written

I don't like my challenge myself.

DJMcMayhem

18:08

@Mr.Xcoder Then dupe-vote it yourself.

Mr. Xcoder

@DJMcMayhem Ok, please hammer it after I do so.

DJMcMayhem

IIRC, OPs can hammer their own questions

Mr. Xcoder

@DJMcMayhem Ah, really?

DJMcMayhem

Well, technically not exactly

But community hammers it right after you vote

Mr. Xcoder

@DJMcMayhem Done.

Please check if it is closed now.

Downgoat

18:11

@DJMcMayhem huh I thought too but apparently didn't work :|

dzaima

there it goes.

Mr. Xcoder

I had to press a button This solved my problem!

Crappy button ^

DJMcMayhem

@Mr.Xcoder For PPCG, yes. For SE in general, no

totallyhuman

:|

Mr. Xcoder

@DJMcMayhem For PPCG, of course

It makes no sense on Puzzling and other related sites too.

New Sandboxed Posts

18:13

0

A: Sandbox for Proposed Challenges

Write a code poem programming-puzzle It is said that Larry Wall, creator of Perl, wrote a poem titled "Black Perl" in said language, as shown here. The poem is fully functional (working syntax, no runtime errors, etc. [no errors in general]). The challenge: In any language (practical language...

Mr. Xcoder

Gtg, Bye

DJMcMayhem

Here's an example of a very similar, yet IMO more interesting challenge: Given a positive integer N, determine if it's very prime. A number is very prime if it is prime and each digit of its decimal representation is also prime. For example, 17 is very-prime, but 19 is not.

Downgoat

@DJMcMayhem Cheddar: (n,f=Math.isPrime)->f(n)&&n.digits.all(f)

Leaky Nun

@DJMcMayhem is 1 prime?

DJMcMayhem

Oh, crap.

Apparently I can't math

Leaky Nun

18:17

CMC: given an array of 0 and 1 (the empty array is in the domain), output whether it is (non-empty and contain only 0)

Business Cat

37 is one of such numbers

Leaky Nun

[] -> 0, [0] -> 1, [0,0] -> 1, [0,1] -> 0

DJMcMayhem

Here's an example of a very similar, yet IMO more interesting challenge: Given a positive integer N, determine if it's very prime. A number is very prime if it is prime and each digit of its decimal representation is also prime. For example, 17 is ~~very-prime,~~ not very prime, ~~but 19 is not~~ and neither is 19.

Leaky Nun

but 23 is very prime

totallyhuman

huh nobody answered this in bubblegum

Phoenix

18:19

@LeakyNun a=>a.All(i=>i<1)&List.Any()

C#

Leaky Nun

@DJMcMayhem Jelly, 5 bytes: ;DÆPẠ

my challenge is 2 byte in Jelly, if anyone is interested

Downgoat

@LeakyNun Swift: {$0.isEmpty&&!$0.contains{$0==1}}

@Phoenix C# does implicit bool->int casts? O_o

DJMcMayhem

@LeakyNun ¬Ȧ?

Leaky Nun

@DJMcMayhem nice

Phoenix

@Downgoat What do you mean?

Leaky Nun

18:21

@Downgoat where do you see that?

Phoenix

Where am I casting a bool to an int?

Downgoat

you used bitwise & (or is that also boolean and in C#)?

Leaky Nun

given an array of 0 and 1

totallyhuman

@totallyhuman probably cause it gets out-golfed by java...

Phoenix

C# does have logical and &&, but bitwise & has an override for booleans. This is also true in Java.

It's not used because it makes it less clear what your code is doing.

DJMcMayhem

18:23

@LeakyNun Do you know why the product of an empty list in Jelly is 1?

Leaky Nun

@DJMcMayhem what does "why" mean?

Mr. Xcoder

@Downgoat {$0==[]&&!$0.contains{$0==1}} saves some bytes

DJMcMayhem

I'm not sure. Half of it is is this intentional or a weird side effect and the other half is Is this useful? Why was it designed that way?

Leaky Nun

	'P': attrdict(
		arity = 1,
		call = lambda z: functools.reduce(lambda x, y: dyadic_link(atoms['×'], (x, y)), z, 1) if type(z) == list else z

Downgoat

@Mr.Xcoder huh TIL swift has == support for arrays

Leaky Nun

18:24

Because the starting value of the reduce is 1

@DJMcMayhem in maths an empty product is also 1

Mr. Xcoder

I think you meant {$0!=[]&&!$0.contains{$0==1}}, though

Leaky Nun

1 seems to be the only sane option

Downgoat

Ok, final Swift answer: {$0!=[]&&!$0.contains{$0>0}}

DJMcMayhem

ooooh, so it's actually the same thing as reduce by multiplication?

Leaky Nun

@DJMcMayhem yes, which is why it vectorizes as well

Mr. Xcoder

18:25

@Downgoat You're welcome (joking)

Phoenix

@Downgoat have you tried &?

DJMcMayhem

1×/ seems to be equivalent

Downgoat

@LeakyNun :O I change answer: {$0.reduce(*,1)}

Mr. Xcoder

@Downgoat Golfed: {$0==[]&&!$0.contains(1)}

@Downgoat What?

Downgoat

@Mr.Xcoder wait nvm

Leaky Nun

18:26

@Downgoat that's invalid

Downgoat

actually swap positions of 1 and *

Leaky Nun

[0,0] and [0,1] give the same output

Downgoat

brb checking

DJMcMayhem

I'm actually starting to get Jelly. It's really nice

Mr. Xcoder

It doesn't work that way

totallyhuman

18:27

hey why does userscript say 140.5 hex bytes when it's 140?

Leaky Nun

@DJMcMayhem nobody gets jelly, not even Dennis himself

DJMcMayhem

That's why I said starting

Leaky Nun

in Jelly, Apr 1 '16 at 18:42, by Dennis

I don't understand my language. ._.

Business Cat

@LeakyNun Can I output nothing as a falsy value?

Leaky Nun

Credits to Erik

DJMcMayhem

18:29

Well FWIW, nmjmcman101 just taught me something I didn't know about V today.

Mr. Xcoder

Final Swift: {$0!=[]&&!$0.contains(1)}

Leaky Nun

@BusinessCat consistent

:38833801 you forgot to test [0,0]

DJMcMayhem

@LeakyNun ... That sounds hard

totallyhuman

8 bytes is the jelly one i think

@totallyhuman shortest one anybody could find

Leaky Nun

@DJMcMayhem you just need to find the right tools

Downgoat

18:30

@Mr.Xcoder make the contains $0.reduce(+)<1?

Phoenix

@DJMcMayhem what was it?

totallyhuman

ok so liek i'm thinking i need to combinations on the range(n)

DJMcMayhem

@Phoenix The count operator stuffs the result into the ". register.

Mr. Xcoder

@Downgoat Equal In length

DJMcMayhem

So you don't need to yank/delete it to save it

Downgoat

18:31

@LeakyNun (Fake) Mathematica: @~LargestSumOfNumbersThatAddToN#[a, b]

totallyhuman

actually me solving that is way overdue so imma start working on it

Downgoat

@Mr.Xcoder this doesn't need the ! though so saves 1 byte

Mr. Xcoder

@LeakyNun I remember that one

@Downgoat sum($0)<1

Leaky Nun

Everyone, please, just let @DJMcMayhem do it.

Mr. Xcoder

haha

Phoenix

18:32

@Downgoat what is that@sign

DJMcMayhem

@LeakyNun We could just move to Jelly Hypertraining

Downgoat

@DJMcMayhem if you are do product of empty list for your answer how come doesn't break with the zeros? :|

DJMcMayhem

→ 3 messages moved to Jelly Hypertraining

Downgoat

@Phoenix idk it just seem like mathematica has a lot of random @s #s and ~s

Phoenix

LargestSumOfNumbersThayAddToN would be a full submission tho

DJMcMayhem

18:33

@Downgoat I didn't use it, I was just screwing around

Downgoat

@Mr.Xcoder error: use of unresolved identifier 'sum'?

Mr. Xcoder

@Downgoat I was joking

Downgoat

oh :|

Phoenix

You should actually learn mathematica it's great.

Mr. Xcoder

@totallyhuman 8 bytes is way too much in Jelly. It's 8 bytes long in Pyth: efqQsT.:

totallyhuman

18:36

it is what it is ¯\_(ツ)_/¯

Mr. Xcoder

And Jelly usually beats Pyth by 2 bytes

Downgoat

> is is

one typo away from disaster

Mr. Xcoder

*what it is

Alternative 13-byte (ungolfy because it uses a loop) Pyth: V_.:Q)IqsNQNB. The first one, efqQsT.: is obviously much, much better.

Downgoat

TeaScript is 8 bytes: .n·x.x<1 but it should be 5 byte idk why automatic . insertion is not working

Leaky Nun

@Mr.Xcoder for a fraction of a second I thought you finally stepped out of your comfort zone

Mr. Xcoder

18:44

@LeakyNun I did with the .u above

That wasn't comfortable at all

Leaky Nun

@Mr.Xcoder check if a list of numbers is ascending

I don't care how you deal with edge cases

Mr. Xcoder

If it is sorted?

Leaky Nun

@Mr.Xcoder you win

you're smarter than me now

Mr. Xcoder

@LeakyNun 3 bytes: qQS

Leaky Nun

@Mr.Xcoder you can do better

Mr. Xcoder

18:46

@LeakyNun Struggling

Leaky Nun

next challenge: check if a list of numbers is strictly ascending

Mr. Xcoder

Wait, wait, I must golf the above if I can do better, right?

Leaky Nun

sure

musicman523

@LeakyNun lambda l:l==sorted(l)

Leaky Nun

@musicman523 strictly.

musicman523

18:50

ah

Bruce Forte

Hey guys!

Mr. Xcoder

@LeakyNun 2 bytes: qS

Bruce Forte

How do I ask a question as community wiki?

Leaky Nun

@Mr.Xcoder good

Mr. Xcoder

Can it be golfed now?

Leaky Nun

18:51

I'll also give you SI because you likely don't know

@Mr.Xcoder I don't think it can

Mr. Xcoder

Ok, next one

@LeakyNun [1,2,3,4]->True, [1,2,2,3]->False, am I correct?

Leaky Nun

@Mr.Xcoder yes

musicman523

@BruceForte I don't think I can do it, don't think I have enough rep, you may be in the same boat

Bruce Forte

Oh, ok

Well I kinda want a "Tips for golfing in x86/x64 machine code" question, that would be nice and there's not yet

Mr. Xcoder

@LeakyNun 3 bytes: q{S, 3 bytes: q.{

Good enough?

Leaky Nun

18:55

good

Mr. Xcoder

Good, Next

musicman523

lambda l:all(a<b for a,b in zip(l,l[1:]))

Bruce Forte

@musicman523 If you're in that boat, I certainly am too ^^

Leaky Nun

whether a list is an arithmetic sequence @Mr.Xcoder

HyperNeutrino

Jelly: IE

Mr. Xcoder

18:55

@LeakyNun How should I determine that in general?

Leaky Nun

@Mr.Xcoder the difference between consecutive terms is the same

Mr. Xcoder

@LeakyNun Ok

Leaky Nun

@musicman523 you can do better

musicman523

how much better?

Mr. Xcoder

@LeakyNun That's going to be harder

Leaky Nun

18:57

@musicman523 19 bytes

musicman523

that's a lot of bytes

Mr. Xcoder

@LeakyNun Hint for golfing?

Leaky Nun

@Mr.Xcoder .+

Mr. Xcoder

Thanks

Transcript for