The Nineteenth Byte

quartata

5:00 PM

@βετѧΛєҫαγ What a horrible CAPTCHA

@Dennis Can a mod nuke this room? Downgoat and I accidentally made two

orlp

why don't you guys just all speak dutch?

TùxCräftîñg

because we dont know dutch... ?

Leaky Nun

^

quartata

I haven't gotten around to learning it yet but from what I've seen of it it looks weird

Theo

I'd say that's a pretty good reason @TùxCräftîñg

Dennis

5:04 PM

@quartata poof

quartata

Hey, when did No Man's Sky get released?

@Dennis Thanks

Business Cat

Apparently 2 days ago

But I bought it on Steam and I couldn't install it

quartata

I hope there will be a Linux version

It probably uses DX11 so I can't Wine it

@BusinessCat Oh, it's not out on Steam yet it looks like

It won't be out until tomorrow

Business Cat

Ahh that's cool

Guess I just have to do something productive tonight instead

Leaky Nun

5:19 PM

0

A: Fix my IPv4 address's missing periods

Brachylog, 93 bytes :ef:{".",@N.|.}ac:2f. ,0<N<4,?:N:4i.@nMl4,M:{:5&<256}a ~c[A:B]h:@N:Bc. :ef:{,"0":"9"y:.m?}ac. Try it online!

Built a bunch of what should be built-ins, still shorter than the other answers

I built string to integer (4th line)

Is insert (3rd line)

Replacement (1st line save last 4 letters)

If built-ins existed for those it would have had much less bytes

Fun idea: find Python 3 answers before its release date and then mark them as non-competing

TùxCräftîñg

esolangs.org/wiki/TypeNet_(Python_library)

shameless plug on esowiki lol

VTCAKAVSMoACE

Superfast accept

Do we have a general consensus on how early is too early to accept an answer here?

Business Cat

I would say wait until it's been inactive for a while

zyabin101

@VTCAKAVSMoACE We don't and we won't. The time to accept is whenever the heart feels.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@LeakyNun don't please

._.

Leaky Nun

5:33 PM

@EᴀsᴛᴇʀʟʏIʀᴋ lol

Eᴀsᴛᴇʀʟʏ Iʀᴋ

the hardlink

it pains me

TùxCräftîñg

:(

HiggsBot is under 20 rep

quartata

Try now.

He should be able to chat in BBM, I gave him write access

Eᴀsᴛᴇʀʟʏ Iʀᴋ

holy shit

@quartata has like 33 rooms open rn

quartata

I thought we already established that I'm weird

Eᴀsᴛᴇʀʟʏ Iʀᴋ

5:41 PM

s/weird/addicted to SE chat/

New Meta Posts

0

Q: Ban zip-style decompression for kolmogorov-complexity?

A little while ago, I wrote a PPCG challenge under the kolmogorov-complexity tag, which frankly bombed. Briefly, the challenge was to output a series of names. The first half of names were fixed but entrants could choose their own set of names for the second half under fairly loose restrictions...

zyabin101

@NewMetaPosts What? No!

TùxCräftîñg

@NewMetaPosts ಠ_ಠ

Bald Bantha

I know this can be golfed more I'm just not too familiar with array.map so I'm not sure how to do so. Could someone enlighten me?

Theo

@NewMetaPosts Why?!

quartata

5:52 PM

It's a legitimate question.

I personally think his reasoning is slightly flawed but it's not a reason to downvote it IMO

Business Cat

IMO doing a compression is just hardcoding the output

Which is generally frowned upon

Bald Bantha

I don;t get why you guys are mad. Using built-in compression is the most boring thing.

Theo

But hardcoding the output is part of the idea of kolmogorov-complexity challenges

Bald Bantha

not exactly

You can get a little creative, especially when the output is repetitive

zyabin101

@LeakyNun Python 3.0.1 was released on February 13, 2009.

Theo

5:55 PM

Of course, you can come up with some smart techniques to reduce the byte count,

zyabin101

It is far older than this site.

quartata

@LeakyNun More to the point how is this "fun"

Maltysen

@BaldBantha But this is just another instance of built-ins allowed or not

Leaky Nun

@quartata Alright

@zyabin101 Alright

Theo

And as the 1 answer says, it takes only 1 extra sentence in the challenge description if you do want to ban compression for that specific challenge

TùxCräftîñg

6:10 PM

UROFT (Useless Regex Of The Day): \p{Kannada}_+\p{Kannada} match most disaproval faces

Theo

@TùxCräftîñg How is that useless?

TùxCräftîñg

because i dont see the utility of a disaproval face regex...

Nathan Merrill

.* matches all disapproval faces

Eᴀsᴛᴇʀʟʏ Iʀᴋ

lol

TùxCräftîñg

"."*10**10**10

zyabin101

6:13 PM

@TùxCräftîñg I don't know how a ".....[5 more]" and 10 match up with **.

Bald Bantha

@EᴀsᴛᴇʀʟʏIʀᴋ codegolf.stackexchange.com/a/89547/47019

TùxCräftîñg

ಠ¯ಠ

zyabin101

Mat's Mug, Quebec

181 3

code-golf date sorting

o_o

Code Review × Code Golf match upp...

Theo

That awkward moment when a mug has more rep than you...

Anonymous

6:31 PM

My steam account got hijacked :(

quartata

Wait, really?

It says you're online

Anonymous

I am

Anonymous

But someone logged in and added a not-mine phone number

Anonymous

So now I can't change anything on my account, because they get all the SMS verification codes

TùxCräftîñg

contact the support

Anonymous

6:33 PM

The only thing I could change is removing my PayPal account link, so they can't spend my money on hats and knives

quartata

That means they had to have physical access to your phone for the mobile authenticator

Anonymous

I didn't have the mobile authenticator enabled.

quartata

I'd blame your roommate

@Mego pleb

Anonymous

My roommate is my wife, and it's not her phone number

Bald Bantha

Heh that would be funny though

Anonymous

6:34 PM

Listen mate, I just learned they added a mobile authenticator while going through this mess :P

Bald Bantha

So you don't use email verification?

quartata

@Mego I don't see how you could have not known, you can't trade without it

@BaldBantha He does (can't buy anything at all without it I don't think) but there's a massive difference in security between e-mail and physical device

Bald Bantha

good point

Anonymous

@quartata I use Steam Guard (via emails)

Anonymous

Which means the person must've gotten into my email

Anonymous

6:35 PM

Which seems unlikely, because I use 2FA

Anonymous

So really I'm just really confused

Anonymous

And the phone number doesn't match anyone in my phone contacts

Anonymous

On a completely unrelated note, does anybody have feedback on this sandboxed challenge (other than "add more test cases")?

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@quartata you don't have it set up I thought either? :P

quartata

I do

Eᴀsᴛᴇʀʟʏ Iʀᴋ

6:46 PM

oh, do you want the trading cards then?

quartata

?

Helka Homba

I mean, seriously...

DJMcMayhem

@Mego That really sucks. :( How large was your library?

Leaky Nun

@Mego Where did you get the palette from?

quartata

@DJMcMayhem He hasn't lost his account (yet)

Eᴀsᴛᴇʀʟʏ Iʀᴋ

6:48 PM

@quartata you said you wanted my portal 2 trading cards, at 1 scrap each.

quartata

Oh, sure send a trade offer

I think I said 1.5

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@BaldBantha nice try, but that answer is invalid.

@quartata oh yeah

Business Cat

> such that the sum of the absolute value of the sum of the differences of the RGB channel values

what

Eᴀsᴛᴇʀʟʏ Iʀᴋ

The FOG one.

@BusinessCat idk

Anonymous

@DJMcMayhem I still have access to my account, because the hijacker didn't change the password. 168 games, though.

Anonymous

6:49 PM

@LeakyNun Wikipedia

Leaky Nun

@Mego I mean how do we generate the palette if the only requirement that each colour be different?

quartata

@Mego I assume you've already contacted support

Anonymous

@quartata Yep, waiting on a reply to my ticket

DJMcMayhem

Oh, OK that's not as bad as I thought. I thought you had lost it.

quartata

@Mego Don't log off Steam while you're waiting

Anonymous

6:50 PM

@BusinessCat Take the absolute value of the difference between the red channel in the original and in the output, for a given pixel. Do that for the green and blue channels, also. Sum those 3 values. Repeat for every pixel. Sum all of those values.

Anonymous

@quartata Not planning on it

quartata

You can only have one instance of desktop Steam logged into an account at a time so

Anonymous

@LeakyNun Maybe it's not clear enough - you use each color from the palette I linked exactly once in the output image.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@quartata can't right now, but i'll send a trade offer later.

quartata

You know how to do it right

Leaky Nun

6:51 PM

@Mego Then why did you choose those 8 colours in the first example?

Eᴀsᴛᴇʀʟʏ Iʀᴋ

oh yeah

Jonathan Allan

@Dennis - can Jelly get yield the date? I see the source imports time but only see a monad to get the time.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

just can't right now

why did this get stars

5 hours ago, by Eᴀsᴛᴇʀʟʏ Iʀᴋ

ninja'ed by the turtle

quartata

I'll send you my offer URL in steam if you don't have it already

Anonymous

@LeakyNun Because that's a 3-bit palette. 3-bit color makes for a simpler example than 8-bit color.

Leaky Nun

6:52 PM

@Mego I think you should clarify that

Anonymous

> All images will use 8-bit colors (3 bits in the red and green channels and 2 in the blue channel), and will be 16x16. Here is an image displaying the 8-bit color palette. Each color from this palette must be used exactly once in the output image.

Leaky Nun

@Mego That you used 3-bit palette in the first example

Anonymous

> 3-bit example

Dennis

@JonathanAllan No, unfortunately. I should add that.

Leaky Nun

@Mego I mean you should chain the two ideas together, that you used 3-bit palette in the example but we are to use 8-bit palette

Helka Homba

6:54 PM

strawpoll.me/10962134

Jonathan Allan

@Dennis ah yeah should add it to the bitwise masking I guess

Anonymous

@HelkaHomba Other: surviving the apocalympics by not being in Rio

TùxCräftîñg

@HelkaHomba can i answer 'nothing'?

Anonymous

@LeakyNun I don't think that's unclear.

Leaky Nun

@Mego Well I think that's unclear.

@Mego You didn't even mention "3-bit palette". You just said "3-bit example"

DJMcMayhem

6:56 PM

@HelkaHomba That's a really hard choice between "open field" and "1V1".

Dennis

@HelkaHomba Eh, all of those require going outside and moving. Where are chess and code golf?

7

Leaky Nun

@Mego You didn't even care to elaborate what "3-bit" even means. I had no idea that it was referring to each bit for each channel.

TùxCräftîñg

code golf need to be in olympics

Helka Homba

@Dennis Golf would be under other

zyabin101

@TùxCräftîñg It doesn't require going outside and moving actively.

TùxCräftîñg

7:01 PM

yes but compressing minecraft in 1 byte is olympic

HQ9+M, 1 byte: M

Anonymous

@LeakyNun That's standard terminology for color depth. X-bit color means that there are a total of X bits in each pixel, spread (usually) as evenly as possible through the 3 RGB channels (with blue getting shorted if necessary, like with 8-bit color).

zyabin101

If there were olympiads with code golf, then a Coder Olympiad.

Helka Homba

@Mego What's wrong with them? People won't die of green water.

quartata

I think chess and bridge might be at the 2020 Olympics which is nice

TùxCräftîñg

i have borked my shell by adding fancy unicode chars in my PS1 :/

Jonathan Allan

7:03 PM

Chess still struggling with the logo requirements set upon them:

21

Q: Chess at the 2020 Olympic Games

For the 2020 Olympic Games, the World Chess Federation asked the Olympic committee to include chess as official sport. The committee agreed under one condition: The Chess Federation must design a chess-colored black and white logo, consisting of three intersecting Olympic rings with areas 1 each...

mathematics geometry

Leaky Nun

@Mego Alright, whatever floats your boat

quartata

@JonathanAllan Haha that's a nice puzzle

zyabin101

@LeakyNun s/b/g/ 🐐

Jonathan Allan

solved, yet OP wants a "geometric" proof it seems (what, with the picture hints and all)

TùxCräftîñg

brb|g'n

zyabin101

7:05 PM

@TùxCräftîñg Nite!

Helka Homba

@Mego And I know Rio has its own issues that the Olympics are somewhat exacerbating, but because of the Olympics such issues are getting more attention than they would normally. Not to mention the Olympics inspires thousands if not millions of children in an increasingly sedentary generation to be more active, and gives an entire continent a sense of pride, and promotes overall global unity.

TimmyD

@LeakyNun Oh.

Leaky Nun

@TimmyD Yes.

TimmyD

Example A is different than the explanation text.

Leaky Nun

@TimmyD See what I did?

TimmyD

7:14 PM

Yes.

Leaky Nun

Oh.

TimmyD

I posted my answer. It's a beast.

Leaky Nun

@TimmyD Yes.

Helka Homba

In case it's not clear, I like the Olympics. Don't go disparaging them in front of me >:I

Anonymous

@HelkaHomba People will die of corrupt officials, gangs running wild, and various waterborne pathogens present in the water where the triathlon athletes have to swim (thanks to all of the body parts that have been washing up on the shore).

Anonymous

7:18 PM

I like the Olympics. I dislike the Olympics being held in Rio, because there's massive safety issues that should have prevented Rio from being chosen as the host, if it weren't for the even more massive amounts of corruption present in the IOC.

Anonymous

The tap water in the Olympic Village is not potable. Athletes and journalists have to use bottled water for drinking, bathing, and brushing their teeth.

DJMcMayhem

CMC: draw a fence of length "n" (input). For example, a fence of length 3 is |---|---|---| a fence of length 0 is |

5 is |---|---|---|---|---| etc.

Theo

Python 3: lambda n:print("|"+"---|"*n)

quartata

@DJMcMayhem Compressing.....

zzz

I wish zopfli wasn't so slow

I already know the shortest one is BB96, lemme get to the good part

Anonymous

@DJMcMayhem Actually, 11 bytes ;'-*'|+*'|o

DJMcMayhem

7:24 PM

V, 11 Bytes: v.tryitonline.net/…

That's longer than i'd like.

Rainbolt

@Lynn Nice edit.

Anonymous

@Theo lambda n:"|"+"---|"*n is shorter; you don't need to print with a lambda

Rainbolt

I'd love to be able to +1 revisions to a post

quartata

cinnamon-gum.tryitonline.net/…

7 bytes

Theo

@Mego Shoot. Of course

Leaky Nun

7:25 PM

@DJMcMayhem Brachylog, 19 bytes: yb:{,"|---"w}a,"|"w

Still uses imperative style

Trying to use declarative style to golf it

Business Cat

JavaScript: n=>"|"+"---|".repeat(n)

Leaky Nun

@DJMcMayhem 17 bytes: ybe,"|---"w\;"|"w

Poke

Java: String a(int n){String a="|";while(n-->0)a+="---|";return a;}

gotta love the "goes to" operator

only 61 bytes >.>

DJMcMayhem

What the heck? It should be seven, é|Ài|³- but that doesn't work. ;_;

Anonymous

@Poke Why not a lambda?

TimmyD

7:29 PM

@DJMcMayhem PowerShell, 19 -- '|'+'---|'*$args[0]

Poke

s/Java/Java 7/

/me coughs

i think i can use a for loop to shorten it some

owell

Leaky Nun

@DJMcMayhem Pyth, 10 bytes: j"---"*\|h

9 bytes: j*3\-*\|h

trichoplax

@HelkaHomba 1 v 1 fighting scores higher than team sports. Note to future KotH writers?

DJMcMayhem

The only KOTH I've done was 1v1

Poke

here's Java7 in 41 bytes... String q(int n){return n==0?"|":"|---"+q(n-1);}

the savings is real

Business Cat

7:34 PM

Retina, 16 bytes (input is in unary)

Leaky Nun

@BusinessCat retina.tryitonline.net/#code=MQotLS18Cl4KfA&input=MTEx

Anonymous

@Poke Use n>0 and swap the ternary

Anonymous

q=(int n)->n>0?"|---"+q(n-1):"|"; in Java 8 with a lambda :)

Dennis

It would make me very happy if this user learned this language.

Business Cat

@LeakyNun I guess I didn't think you could replace ^

Poke

7:35 PM

@Mego nice. i guess i could also just make it n<1

still a good catch

Leaky Nun

@BusinessCat You aren't replacing ^, you're just replacing the empty string at the beginning

^ is just an anchor stating that we are at the beginning

Dennis

I fixed my speed problems! \o/

dennis-home:~$ time python3.5 -c 'from gnumber import *;Gnumber("5000.1").exp()'

real    1m52.998s
user    1m53.030s
sys     0m0.016s
dennis-home:~$ time python3.5 -c 'from gnumber import *;Gnumber("5000.1").exp_alt()'

real    0m2.156s
user    0m2.154s
sys     0m0.002s

Business Cat

Also neither of our version works with n=0

Leaky Nun

@BusinessCat retina.tryitonline.net/#code=MQotLS18Cl4KfA&input=

0 in unary is empty string

Business Cat

I know

It's giving me 2 as output

Leaky Nun

7:37 PM

Please, be fair, just use decimal input

Eᴀsᴛᴇʀʟʏ Iʀᴋ

It's a sad day. I voted to recommend deletion on an answer in my own language.

Leaky Nun

@BusinessCat PEBKAC?

@BusinessCat Screenshot please

Business Cat

Oh nevermind, there was a trailing newline in the code

That broke it

Leaky Nun

Alright

DJMcMayhem

@EᴀsᴛᴇʀʟʏIʀᴋ ;_; and many tears were shed

FryAmTheEggman

7:38 PM

@Dennis "I fixed my speed problems" - Dennis 2016

Didn't know you were into that kind of stuff ;)

DJMcMayhem

Out of curiosity, I've never known exactly what "recommend deletion" means.

FryAmTheEggman

More seriously, that's great. Was there one big problem or like a lot of small ones?

trichoplax

Is it what delete votes are called when done through the review queue?

quartata

@Dennis Is this the arbitrary precision math library you're working on

Dennis

@FryAmTheEggman Well, I'm writing a Number class, and over a minute to calculate exp(5000.1) was kinda awful.

trichoplax

7:39 PM

What did you change?

FryAmTheEggman

Yeah I was just joking around with speed being another name for cocaine :P

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@DJMcMayhem yes

@DJMcMayhem i think auto-flag for deletion

trichoplax

@FryAmTheEggman If you're going to make jokes about controlled substances you should probably learn which ones are which :P

FryAmTheEggman

Oh, yeah speed is amphetamines right?

Bah :P

Dennis

@trichoplax I was keeping numerator (power of x) and denominator (factorial) separate. Now I just store the quotient to avoid division by a huge number, which was the primary speed problem.

In retrospect, kinda obvious. Not used to writing good code.

DJMcMayhem

7:41 PM

@EᴀsᴛᴇʀʟʏIʀᴋ does that mean enough of those will delete it? Cause I believe you need 2k to cast a delete vote.

Eᴀsᴛᴇʀʟʏ Iʀᴋ

i think so

and yeah, 2k

i need like 40 more rep until then. >_>

DJMcMayhem

brb, serially upvoting

trichoplax

@Dennis Certainly seems to have made a huge difference (and doesn't seem obvious to me...)

DJMcMayhem

That was a joke. I'm not planning on doing that

Eᴀsᴛᴇʀʟʏ Iʀᴋ

ik

Dennis

7:44 PM

@DJMcMayhem If you have the privilege, it just casts a delete vote. If not, Community will eventually raise a moderator flag if there are more recommend deletion than looks good reviews.

@trichoplax Division is hard. Even for 64-bit integers, division is an order of magnitude slower than multiplication, which is an order of magnitude slower than addition. With large denominators, it gets bad.

FryAmTheEggman

^ Something got garbled there. Did you mean addition the second time?

Nathan Merrill

nah, division is two orders of magnitude slower than division

2

DJMcMayhem

@Dennis OK ty. So then what's the point of allowing review before delete?

Dennis

@FryAmTheEggman Yes, that. Writing is also hard. :P

@DJMcMayhem Because if there aren't enough high-rep users, low-rep users can involve a moderator. Am I understanding your question correctly?

trichoplax

@Dennis Oh of course - you're going outside the standard number types so you don't get the advantage of hardware support

FryAmTheEggman

7:49 PM

On most modern architectures isn't multiplication usually doable in one clock cycle, so it's roughly the same as addition? Obviously not for bignums but for 64 bit I think it's fine?

DJMcMayhem

@Dennis oh that makes sense. Yeah, you're understanding the question correctly. Thanks!

Nathan Merrill

12

Q: Is integer multiplication really same speed as addition on modern CPU

I hear this statement quite often, that multiplication on modern hardware is so optimized that it actually is same speed as addition. Is that true? I never can got any authoritative confirmation. My own research only adds questions. The speed tests usually show data that confuses me. Here is an ...

c++ performance cpu multiplication addition

Helka Homba

@Mego That seems debatable. Still, drinking bottled water is a small price for athletes to pay to be at the Olympics. Most of them and their doctors are probably aware of the risks involved.

And of course the Olympics should be safe, but banning all third world hosts seems an elitist mindset, antithetical to the game's ideals.

Steven H.

Isn't the reason that multiplication is doable in one clock cycle just because of pipelining? You'd only get the advantage of speedy multiplications if you're multiplying several numbers

Leaky Nun

@DJMcMayhem Do you have more CMCs?

DJMcMayhem

7:53 PM

Not right now

FryAmTheEggman

@NathanMerrill Huh, weird, could've sworn I read that somewhere. Maybe I made the same mistake as in one of the comments there about FP stuff...

Anonymous

@HelkaHomba I never said anything about banning all third world hosts. I merely said that, if a country/city is not safe for hosting the Olympics, then they should not host the Olympics. The main reason Rio is hosting is because of a massive amount of bribes.

Dennis

@FryAmTheEggman Order of magnitude may have been an exaggeration, but it's indeed slower. Addition takes 1/3 cycles on recent Intel processors, multiplication 2, and division up to 86.

Anonymous

Holy carp those flags

Conor O'Brien

^

Eᴀsᴛᴇʀʟʏ Iʀᴋ

7:56 PM

what?

Conor O'Brien

@El'endiaStarman Yeah. I always thought I'd be just right for the air force.

Leaky Nun

@DJMcMayhem You're like the goose who lays gold eggs; it can't be forced

Anonymous

DJMcGoose

Theo

@LeakyNun What makes a CMC good?

Leaky Nun

@Theo You have an idea?

Dennis

7:57 PM

If they were good, they'd be real challenges. :P

2

Leaky Nun

Just say it here

DJMcMayhem

@Mego BRB, changing name

Leaky Nun

@Dennis I beg to differ

@Theo that it can be done quickly

Conor O'Brien

^

Anonymous

@Dennis Some of them are too trivial to be well-received on the main site. Most of them are arguably dupes of other main-site challenges.

Dennis

7:58 PM

@LeakyNun How so? If you have a challenge that is actually interesting, why not post it on the main site?

zyabin101

@DJMcMayhem Really, so fast? o_o

DJMcMayhem

What makes a real challenge good?

Leaky Nun

@Dennis Because the criteria for interesting in here and in there are different

Conor O'Brien

@DJMcMayhem ask the white fox

Dennis

@LeakyNun Fair enough. I was using the same definition of "good".

DJMcMayhem

7:59 PM

@white-fox what makes a challenge good?

Conor O'Brien

(helka homba)

Leaky Nun

Print exactly this text:

Eᴀsᴛᴇʀʟʏ Iʀᴋ

a

DJMcMayhem

Oh duh, I should have realized that.

Anonymous

@LeakyNun Actually, 0 bytes:

Leaky Nun

7:59 PM

*
**
***
****
*****
******
*******
********
*********
**********

Transcript for