The Nineteenth Byte

AdmBorkBork

2:00 PM

JS-hell?

7

Xynos

@AdmBorkBork

Sounds like it

Nathan Merrill

if it has the added benefit of antagonizing the JS community, I'm ok with that

Neil

@LeakyNun isn't that 2 bytes in Jelly: Ụị? Try it online!

Leaky Nun

@Neil :o til

caird coinheringaahing

@LeakyNun What was your solution?

Leaky Nun

2:09 PM

@cairdcoinheringaahing interleave-sort-transpose-last element

caird coinheringaahing

CMC: Given a string, remove all whitespace (spaces, tabs and newlines) from that string. Example: "\n\t Hello, \nWorl\td! " => "Hello, World!"

DJMcMayhem

@cairdcoinheringaahing V, two bytes: Íó

Oh wait

caird coinheringaahing

Also, current sequence for the OEIS challenge: "Local stops on New York City A line subway." I hate OEIS

DJMcMayhem

V, three bytes: Íßs

caird coinheringaahing

@DJMcMayhem How does that work?

DJMcMayhem

2:17 PM

Translates to :%s/\_s//g<cr> in vim

caird coinheringaahing

@DJMcMayhem Sorry, I don't speak vim either :(

DJMcMayhem

That's fine

mbomb007

@ATaco Why? Python is probably the top golfing language

And by "top" I mean "most used"

DJMcMayhem

@cairdcoinheringaahing :%s/foo/bar means on every line, replace foo with bar. \_s means a whitespace character including Newlines, and we're replacing it with nothing (cause the //). The g just means replace multiple occurrences on the same line if you need to, and <cr> actually executes the command (cause : means shell mode)

Xynos

@mbomb007 codegolf.meta.stackexchange.com/a/13946/72131 should i post this and we can see?

Neil

2:22 PM

@cairdcoinheringaahing Retina, 3 bytes: `\s

`

Funky Computer Man

@Shaggy I took latin for 4 years but never realized it was per se and not per say. :P

AdmBorkBork

@cairdcoinheringaahing PowerShell, 18 bytes -- -join-split"$args" Try it online!

Actually, I think you can ignore the quotes

Poke

does windows come with any japanese fonts

trying to confirm that the yen symbol is the same bitsequence as a backslash

in a japanese font

Pavel

@Poke Yes it is the same sequence.

Source: Accidentally set system locale to Japanese some time ago.

Poke

2:38 PM

that's really annoying

Pavel

C:¥Users¥Pavel¥git¥jansi¥

CMC: Given an int array, add it with its reversed self: [2, 5, 9, 14] => [2, 5, 9, 14] + [14, 9, 5, 2] => [16, 14, 14, 16]

Leaky Nun

CMC: given positive integers n and r, where n>r, find the number of ways to put n distinguishable balls into r distinguishable boxes, with each box having at least one ball

@Pavel Jelly, 2 bytes: +U

@Pavel Pyth, 3 bytes: +V_

AdmBorkBork

2:54 PM

@Pavel PowerShell, 27 bytes -- param($a)$a|%{$_+$a[-++$i]} Try it online!

Leaky Nun

@Pavel Python, 38 bytes: lambda a:[*map(int.__add__,a,a[::-1])]

@Giuseppe hi

Pavel

@LeakyNun Mathematica, 17 bytes: Binomial[#2,#-#2]

I think

Leaky Nun

@Pavel I don't think that's right

Pavel

Yeah the more I think about it the wronger it looks

Leaky Nun

@Pavel R, 24 bytes: print((n=scan())+rev(n))

Giuseppe

2:57 PM

@LeakyNun I think cat is sufficient here

Pavel

@LeakyNun Mathematica, 9 bytes: #2^(#-#2)

Leaky Nun

@Giuseppe hmm?

Pavel

Seems more correct

Leaky Nun

@Pavel I don't think that's right: with each box having at least one ball

Giuseppe

@LeakyNun rather than print

Leaky Nun

2:57 PM

@Giuseppe oh ok

Pavel

Isn't it? We subtract #2 from # to account for each box containg at least one ball.

Then we multiply #2 by itself for each remaining ball

Leaky Nun

@Pavel you can't pre-choose which ball is the "at least one" ball

Pavel

Oh yeah, right.

Giuseppe

@Pavel MATL, 3 bytes: tP+

AdmBorkBork

@LeakyNun This is tricky.

Leaky Nun

3:04 PM

@Pavel Actually, 4 bytes: ;R♀+

@Pavel Brachylog, 6 bytes: ↔;?z+ᵐ

@ATaco is your tio cmc button working?

Pavel

@LeakyNun Mostly, but it dies when it needs to escape backslashes

AdmBorkBork

It's like n!/r!-(n-r)! ???

Leaky Nun

@AdmBorkBork it isnt

@Pavel oh nvm thanks

AdmBorkBork

Hmm. I must not be remembering my "n choose k" formulae

Leaky Nun

@AdmBorkBork that is correct for n choose r

n!/r!(n-r)! though, no minus

Neil

3:07 PM

@LeakyNun 35 bytes: remove the [* and ]

Leaky Nun

@Neil tried, it returns a map object

AdmBorkBork

Right, but it's not a simple n choose r

because they're distinguishable

Neil

>>> f=lambda a:map(int.__add__,a,a[::-1])
>>> f([1,2,4,8])
[9, 6, 6, 9]
>>>

caird coinheringaahing

@Neil Yeah, but that's Python 2. Leaky doesn't like Python 2

Pavel

@LeakyNun I think this might work: (#2^(#2-#))/(#2-#)!*#!)&

Neil

3:10 PM

well then he should have said Python 3 :-P

Pavel

Or $\frac{b^{a-b}}{\left(b-a\right)!}\cdot a!$

Leaky Nun

@Pavel what does a=7,b=3 give?

Pavel

Opens W|A

GODDAMMIT

I think it might need to be $(a-b)!$

Leaky Nun

@Pavel it isn't

Pavel

It is definitly not.

Leaky Nun

3:16 PM

@Pavel Jellyfish, 7 bytes: p+R¶ Ei

let's see whether you come up with a solution before I finish doing your CMC in 10 languages

Pavel

Hmmmm

Leaky Nun

Jelly, Pyth, Python, R, Actually, Brachylog, Jellyfish

Pavel

Binomial[#-1, #2-1] works for indistinguishable balls

So to account for the balls being distinguishable... Binomial[#-1,#2-1]#! works?

Leaky Nun

@Pavel no, balls in the same box have no order

Neil

@LeakyNun just to clarify, the easy case without the minimum is just rⁿ?

Leaky Nun

3:20 PM

@Neil yes

Pavel

@LeakyNun So then it's Binomial[#-1,#2-1]#2!.

Leaky Nun

@Pavel balls in the same box have no order

Pavel

Yes

Leaky Nun

@Pavel J, 3 bytes: +|.

@Pavel justify your solution

Pavel

To be clear, [a, b], [c] != [c],[a,b]? For 3 balls, 2 boxes.

Leaky Nun

3:23 PM

wtf

@Pavel right

AdmBorkBork

@LeakyNun 10/10 best snek

Pavel

Nope i'm wrong again Binomial[#-1,#2-1]#2! doesn't treat [a,b] and [b,a] as the same but it does treat [a,b],[c] and [a,c],[b] as the same thing

Crud I GTG

;-;

@LeakyNun I think you should post this to main, but on math.se

Leaky Nun

@Pavel nah, i got this from math.se

Lembik

here is a fun coding/golf challenge for those who like web things

starting at theguardian.com/film+tone/reviews , print out the name of every film ever reviewed with its star rating as a number

Leaky Nun

@Pavel 05AB1E, 2 bytes: R+

HyperNeutrino

3:29 PM

@LeakyNun I was going to ask if you meant U+ and then I realized that it wasn't Jelly :P

Lembik

would that make an acceptable challenge?

or more suitable for the chatroom?

HyperNeutrino

wtf is this even: oeis.org/A000214

@LeakyNun I think I got a proof for the group theory problem

I was looking at it backwards by trying to show that for group G and H1, H2 < G with H1 as a proper subgroup and H1 union H2 = G that H2 would be unclosed, but it was easier backwards :P

Leaky Nun

@HyperNeutrino hmm?

HyperNeutrino

Like I just showed that for group H1 and H2, in order for H1 union H2 to be closed, one of them had to be a subgroupeq of the other

like let's say we have group H1 and H2 and G = H1 U H2

associativity, the identity property, and the inverse property of G are all trivial to show since H1 and H2 have these

Sherlock9

@LeakyNun Is it C(n-1, n-x)?

So (7, 3) would work out to C(6, 4) = 15

Leaky Nun

3:35 PM

@Sherlock9 no it isn't

the balls are distinguishable

Sherlock9

Well, it isn't C(x+n-1,n)

HyperNeutrino

and since if either group is a subgroup of the other then the union will be the group of higher order thus making it not a proper subgroup of the union, then $\exists x\in H_1[x\notin H_2]$ and $\exists y\in H_2[y\notin H_1]$

Leaky Nun

@Sherlock9 it isn't

MD XF

@Pavel that's a bug

New Main Posts

-3

Q: A java method that identifies the ip address

I want a java method that reads the IP address from the user and identifies the class A,B,C OR D

java

HyperNeutrino

3:41 PM

so then we let $x\in H_1$ and $y\in H_2[y\notin H_1]$

Leaky Nun

Tramontane review – musical road trip untangles trauma of Lebanese civil war
3
In Between review – flatmates crash the cultural boundaries
4
On Body and Soul review – bizarre and brutal tale of lovers in the slaughterhouse
4
Our Last Tango review – passion and pain in tango doc well timed for Strictly season
4
In the Last Days of the City review – adrift in Cairo as the Arab spring looms
3
Lawrence of Arabia review – David Lean's sandy epic still radiates greatness
5
The Lego Ninjago Movie review - zippy spinoff brings familiar, forgettable fun

@Lembik

HyperNeutrino

Then $xy\in H_1\cup H2\therefore xy\in H_1 \text{ or } xy\in H_2$

$xy\in H_1\implies x^{-1}xy\in H_1 \implies ey\in H_1 \implies y\in H_1$ which is false $\therefore xy\in H_2$

Leaky Nun

@HyperNeutrino we say $y \in H_2 \setminus H_1$

@HyperNeutrino nice proof

HyperNeutrino

not done yet but oh ok

and then $xy\in H_2\implies xyy^{-1}\in H_2\implies x\in H_2\therefore\forall x\in H_1[x\in H_2]\therefore H_1\subseteq H_2\therefore H_1\cup H_2=H_2\space QED$; you could say the same for the reverse

I think that's how it goes? @LeakyNun

Sherlock9

@LeakyNun My first instinct was right: Stirling numbers of the second kind

HyperNeutrino

3:56 PM

anyway gtg now o/ and thanks for the hints @Leaky :D

Leaky Nun

@Sherlock9 looks right to me

@HyperNeutrino ok

Lembik

@LeakyNun that's great.. how did you do it?

Leaky Nun

@Lembik Retina

Lembik

@LeakyNun shouldn't you have replied "Retina, see"

(sorry.. pun)

Leaky Nun

lol

Lembik

4:03 PM

@LeakyNun can you get them all that way? That is on all the pages

Leaky Nun

@Lembik I used the source code

Lembik

@LeakyNun I suppose you would need to follow links in that case

Leaky Nun

@Lembik why?

Lembik

@LeakyNun there are pages and pages of reviews

837 pages it seems

Leaky Nun

nvm then

Lembik

4:06 PM

why nevermind?

Leaky Nun

@Lembik I only dealt with page 1 obviously

Lembik

oh right

well you were most of the way there I think

how did you get the star ratings from the one page?

I mean, what did you regex for?

Leaky Nun

I used the source code

golden stars and grey stars

Lembik

ah ok

Leaky Nun

<h1 class="fc-item__title"><a href="https://www.theguardian.com/film/2017/sep/22/tramontane-review-vatche-boulghourjian" class="fc-item__link" data-link-name="article"> <span class="u-faux-block-link__cta fc-item__headline"> <span class="js-headline-text">Tramontane review – musical road trip untangles trauma of Lebanese civil war</span></span> </a></h1>
<div class="stars" role="presentation">
<span class="inline-star inline-icon star__item star__item--golden">
<svg width="14" height="13" viewbox="0 0 14 13" class="star__item__svg star__item--golden__svg inline-star__svg inline-icon__svg">

Lembik

4:08 PM

got it

so if your code can turn to the next page it can do the whole thing I think

saving me hours this evening :)

Leaky Nun

heh, I'm out :P

Lembik

booo :)

I realised it's even easier thanI though

the url has page=400 in it

would you mind sharing your code please?

Leaky Nun

oh it isn't really one code...

it isn't fully automated

wait lemme write the code again

Lembik

thanks

Downgoat

Question: why do a bit shift with 0? Doesn’t that not do anything e.g. (x << 0)

AdmBorkBork

4:18 PM

Implicit casting?

J. Salle

Hey guys, the latest answer to the OEIS answer-chaining challenge yields a sequence that was already answered, can someone comment on that? I don't have enough rep >.>

HyperNeutrino

@J.Salle I'll do it; gimme a sec

Are you sure 214 has been done?

J. Salle

Nope, that was my bad. I was sorting wrong

It was sorting for active

HyperNeutrino

ah ok

use the code snippet :P

Leaky Nun

G`<span class="js-headline-text">[^<]+</span>|<span class="inline-star inline-icon star__item star__item--golden">
m`^.+text">|</span>.+$

<span class="inline-star inline-icon star__item star__item--golden">\n?
1
1+
$.0¶

@Lembik

Neil

4:29 PM

in JS, >>>0 is particularly useful to cast to 32-bit unsigned int

Lembik

4:39 PM

cool

@LeakyNun

much simpler than I thought

AdmBorkBork

@FunkyComputerMan How does Answer-Chaining Fibonacci not have harder answers as the challenge progresses? You seem to be confusing "harder to answer" with "higher quality" which isn't necessarily the case.

AdmBorkBork

4:52 PM

Or maybe I'm not understanding your argument.

Funky Computer Man

@AdmBorkBork I don't see how it becomes harder over time. Perhaps you might need to explain that to me

AdmBorkBork

Each answer reduces the available character set by one.

Funky Computer Man

Oh I thought it was a net of zero

I see

I'll update my answer to reflect that.