The Nineteenth Byte

Mine is probably the GOL on a non-regular grid one, not so much because it is super elegant or well written but because of all the cool stuff people made in answering it.

Jan Dvorak

@HelkaHomba make a 10x10 array of 1's in Javascript

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Make a Login Screen Challenge: make code that asks the user to enter a username and password. The username and password should be hard coded, but they must not be visible: you cannot have the entire username or the entire password in plain text in the code. Both the username and the password m...

Helka Homba

27

A: Javascript: Create a 10x10 array of 1s

Javascript, 34 bytes for(r=[b=[i=10]];i--;r[i]=b)b[i]=1 Since it's apparently OK to make the rows equal by reference, I guess it's apparently OK to rely on that fact. This helps us shave off one for-loop by building the table at the same time as its rows. So, here's my new contestant. Since r...

Mendeleev

1:02 AM

Should I buy a used Nexus 5 or save up for a OnePlus 3T?

Pavel

@Mendeleev Lumia 950

Mendeleev

no, I want an android phone that's rootable

Jan Dvorak

how about a CyanogenMod then?

DJMcMayhem

44

Q: Build a triangle without any triangles

As a little kid, I liked to play with these toys a lot: They probably intended for these to be used for art, but I always used them for math! Fractals, patterns, etc. One time, I was given this challenge: Build a triangle without using any of the green triangle tiles. This challenge stum...

Mendeleev

@JanDvorak 1. That is an OS. 2. That OS is defunct. (Replaced by LineageOS)

DJMcMayhem

1:11 AM

I don't know if that's my absolute favorite but it stands out to me

Downgoat

@Mendeleev keep iphone so you can use gitgoat

Mendeleev

@Downgoat will have to sell to get $

is just incentive to make android gitgoat

Downgoat

however android I will get like $0 because people will pirate and I will be poor :(

Mendeleev

@Downgoat how will pirate if free?

Downgoat

entire app not free

Mendeleev

1:16 AM

wat

Downgoat

will have in-app purchase

Mendeleev

put ads

Jan Dvorak

@Downgoat fail

Downgoat

0/10 ads don't belong in mobile app unless game

Jan Dvorak

neither do IAPs

Downgoat

1:17 AM

Well notification server actually cost money so will charge like $1.99 for that

Mendeleev

@Downgoat not true download roastbot it is my friend's app and it has ads

Downgoat

yeah but I assume it is android app, and android apps are ya know...

Mendeleev

put like a single ad on the initial login screen and then ads at bottom if notifications are enabled.

my friend has made >$300 from roastbot already

and that's just android, he just recently put on ios

@Downgoat can you oppcgmcs?

Downgoat

@Mendeleev link?

Mendeleev

@Downgoat play.google.com/store/apps/…

user165474

1:20 AM

@noɥʇʎԀʎzɐɹƆ I see. But with that in consideration, wouldn't using uo... be equally easy/hard to ping you?

Downgoat

@Mendeleev iOS link?

Mendeleev

@Downgoat one sec dont have itunes because linux

Downgoat

D:

Riker

@DJMcMayhem omg these are literally on the floor behind me

Downgoat

actually that's probably a good thing

> this are

grammar-request :P

Riker

1:21 AM

ffs

eh

Mendeleev

@Downgoat itunes.apple.com/us/app/roastbot/…

Downgoat

see no ads for iOS

Mendeleev

@Downgoat they are there, I assure you

it's just the simulator

Downgoat

yeah but that's not gitgoat

there is no place to put ads

I have thought about it

Mendeleev

Put at bottom

Downgoat

1:23 AM

I could randomly insert ads inside activity feed

Mendeleev

just shrink your layouts vertically a bit

Downgoat

@Mendeleev not allowed

Mendeleev

@Downgoat huh wat

Downgoat

also 0/10 UX pls

Mendeleev

aight then

@Downgoat make $1 iap to remove ads in activity feed

Downgoat

1:24 AM

@Mendeleev UITabBarController goes intowindow

Mendeleev

just use iAds or something

Downgoat

@Mendeleev 10/10 becoming richest goat on barn

wait what iad is gone??

Riker

@flawr ^ from that comic, 10/10

DJMcMayhem

@Riker lol

Mendeleev

Pavel

1:36 AM

Oh, hah.

Mendeleev

@Pavel All right. I just finished a major project wo I have time to relax a bit

Pavel

We have 3 major projects in progress and 5 tests this week.

Mendeleev

I'm glad I'm at an "innovative" school, although I have an exhibition on Wednesday

Pavel

Hey, have you ever participated in the Math Hour Olympiad?

Mendeleev

Not AFAIK

Pavel

1:40 AM

You should totally do it! It's great!

sites.math.washington.edu/~mathcircle/mathhour/olympiad.html

It's completely unlike any other math competition you might have done.

DJMcMayhem

→ 36 messages moved to Open PPCG Minecraft Server

Pavel

Also, May 7th is final Monthly Math Hour lecture, on game theory.

@Mendeleev Oh, and did I mention? It comes with free pizza.

10th grade is also the highest they allow, so this is the final year for us. (You're in 10th, right?)

Downgoat

@Pavel :( california don't have I don't think

Pavel

Considering that to participate you have to physically go to the University of Washington, probably not.

Pavel

2:12 AM

@Mendeleev BTW, you have to register online beforehand, and they fill up rather quickly, so you might as well do it right now: tinyurl.com/ky9hb3z

Riker

just moving back the image I sent that got moved along with the MC messages

Mendeleev

2:31 AM

@Pavel 9th.

Pavel

Oh. Do it anyway, it's excelent. The idea is that you get 7 problems to solve in 3 hours, if you're really good you might just get 4 of them.

Mendeleev

I signed up.

@Pavel So they're that hard?

@Pavel onetimesecret.com/secret/ig2xrstcu5hda5onmlw7liv6m43xnnt

Pavel

Yeah. BTW, I got 1st place last year, I've been doing it every year since 6th grade.

Destructible Lemon

@Mendeleev so tempting to click that

Mendeleev

@DestructibleLemon Don't. It's onetimesecret for a reason.

Destructible Lemon

2:37 AM

yeah just saying but posting links like that in chat kinda defeats the purpose of the onetimesecret site

Pavel

It's a photo of me from the awards ceremony last year.

It's available online.

Example problem (from last year):

> You have 100 pancakes, one with a single blueberry, one with two blueberries,
one with three blueberries, and so on. The pancakes are stacked in a random order.
Count the number of blueberries in the top pancake, and call that number N. Pick up
the stack of the top N pancakes, and flip it upside down. Prove that if you repeat this
counting-and-flipping process, the pancake with one blueberry will eventually end up
at the top of the stack

They don't seem that difficult but you have to prove everything extremely rigourously.

Mendeleev

what's with the pancake flipping everywhere

Pavel

¯\_(ツ)_/¯

CMC solve:

> Homer went on a Donut Diet for the month of May
(31 days). He ate at least one donut every day of the month.
However, over any stretch of 7 consecutive days, he did not eat
more than 13 donuts. Prove that there was some stretch of
consecutive days over which Homer ate exactly 30 donuts.

I don't actually remember how it's done, it's one of the problems I didn't solve.

Wheat Wizard

> I will straight up give 300 rep to anyone that can come up with a brain-flak/brain-flueue Trick or Treat Polyglot (before I do).

CMC / indefinite bounty

Destructible Lemon

@WheatWizard I feel like that would be kind of easy

Wheat Wizard

2:50 AM

Then its 300 free rep

Destructible Lemon

I mean it might be difficult to golf

also getting 300 rep for doing essentially nothing in a >300 byte answer or something

Wheat Wizard

Btw you can now run brain-flueue in TIO with -lbrainflueue

Destructible Lemon

um

@WheatWizard done

Anonymous

@ConorO'Brien Yes, but it got frozen a while back

Wheat Wizard

@DestructibleLemon Gj

Destructible Lemon

2:57 AM

um

I don't know what to say

Pavel

Gah

I literally just came up with that ;-;

Wheat Wizard

@DestructibleLemon I would appreciate it if you golfed it a bit first

Anonymous

@Dennis That's because Python does a weird/dumb thing where its version of CP437 is the "modern" ASCII-compatible code page (where \x00-\x7f match ASCII). Seriously/Actually use the original CP437 codepage (with the wingdings instead of control characters). I had to write my own encoder and decoder to make it work: Seriously/lib/cp437.py

Destructible Lemon

@WheatWizard soon :P

Pavel

CMC: Make a submission to the Versatile Integer Printer using Brain-Flak, Mini-Flak, Brain-Flueue, and Brain-Flak Classic.

(would give rep but I'm rather close to 2000)

DJMcMayhem

3:00 AM

M clearly stands for mega

Destructible Lemon

@Pavel isn't that literally impossible?

DJMcMayhem

It actually seems pretty doable

Destructible Lemon

any miniflak program is a brainflak program with the same function

Anonymous

@Pavel I'll toss 100 rep on a bounty if someone does it

Wheat Wizard

There is not really concept of stack clean in Brain-Flueue, so it would have to be non-stack clean

DJMcMayhem

3:01 AM

@DestructibleLemon No, any mini-flak program can be ran in brain-flak

Err wait

It's doable because the inverse is not true

Destructible Lemon

ok but just wait a minute

Dennis

@Mego So I'd have to run the program though the decoder first? Or is there a way to trigger this from the Actually interpreter?

Pavel

I actually forgot how classic works.

Destructible Lemon

mini-flak and brainflak have to print different things

Wheat Wizard

@Pavel [] is negative 1 [...] prints the value

Destructible Lemon

3:03 AM

but mini-flak is invalid if it uses brainflak features that aren't in miniflak

Anonymous

@Dennis The only way that I think it would work is if you set the system/terminal/whatever encoding to CP437. That's what I do when I locally test programs.

Destructible Lemon

so the miniflak and brainflak would do the same

hence impossible

you're free to try but don't get upset when you can't do it

Pavel

@DestructibleLemon stuff for miniflak, toggle, stuff for brainflack, toggle, pop garbage from stack 1, toggle again.

DJMcMayhem

@WheatWizard is ^^^^^^ true

I thought it is a noop

Destructible Lemon

@Pavel um, <> would render the program invalid in mini-flak

Pavel

3:04 AM

@DJMcMayhem It is true, which I why I've been complaining at wheat-wizard to make it a nop.

Wheat Wizard

@DJMcMayhem what?

Pavel

@WheatWizard Make <> nop and not error

DJMcMayhem

Is <> in MF an error or a noop?

Wheat Wizard

error

rn

DJMcMayhem

It should be a noop

Like Pavel said

Wheat Wizard

3:06 AM

ok I'll do that Right now then

Dennis

@Mego Conor tried chcp 437 on Windows, but it didn't work; I can't find any CP437 option on Linux. What setup do you use?

To test it locally, I mean.

Destructible Lemon

@WheatWizard ok now is possible

Anonymous

@Dennis I use Cygwin on Windows. I can right-click the title bar on the terminal, go to options -> text, and change the character set there.

Dennis

OK, I have no way to test it myself, but if you say 1e 67 works as an LCM program on your system, I'll just believe you. ;)

Anonymous

Where did you get the 67? 1e alone should do it

Dennis

3:12 AM

I need 67 to make it a polyglot.

Destructible Lemon

0

A: Trick or Treat polyglot

Brain-flak/flueue 2200 bytes what can I say? money reputation talks (()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()()...

Wheat Wizard

@Pavel @DestructibleLemon @DJMcMayhem Done

Mendeleev

Brain-flueue git repo is private, where can I get info about it?

Wheat Wizard

Its not private I deleted it

For now I can tell you about it

I am supposed to document it some time

Anonymous

@Dennis Ah

Pavel

3:17 AM

@WheatWizard TY, we can work on VIP now.

Wheat Wizard

VIP?

Pavel

Classic is the easiest, [value]

@WheatWizard Versatile Integer Printer

user165474

VIP = VIP Integer Printer

Mendeleev

@WheatWizard Why?

Wheat Wizard

@Mendeleev The old Brian-Flueue was buggy and feature sparse so I deleted it when Brain-Flueue was added to the Brain-Flak repository. I did forget that the docs were in that repository

Mendeleev

3:21 AM

ah

Wheat Wizard

Although from what I remember the docs were not very helpful

Anonymous

@Dennis Yep, works as intended. The only thing not working is my memory of how to use xxd and bash subcommands :P

Pavel

Obviously mini/brain can be distinguished by toggling stacks.

Anonymous

I'll probably make an easier way to handle raw byte streams in the near future

Wheat Wizard

@DestructibleLemon I'll cut you a deal. I'll give you 150 reputation outright for being the first person to solve the challenge, or I'll give 350 to the shortest answer at the end of the week, (excluding of course myself). You can decide.

Destructible Lemon

3:26 AM

I'm playing TOS right now

will consider when that is done

Wheat Wizard

Ok no rush

Dennis

0

A: GCD / LCM Polyglots!

Jelly / Actually, 2 bytes 00000000: 1e 67 .g This is a hexdump (xxd) of the submitted program. It cannot be tested online because TIO doesn't support the CP437 encoding. Jelly: GCD Jelly uses the Jelly code page, so it sees the following characters....

Thank you for your help!

Anonymous

Glad to help!

Anonymous

Side note: g also works on lists. However, it does nothing when given a single integer.

Dennis

Yes, that's why I said two integer inputs. :)

Kinda neat how it let me get away with placing an LCM and a GCD built-in right next to each other.

Anonymous

3:32 AM

Yeah, you used the right languages for the job :P

Anonymous

You could have also used Seriously and Actually for 3: ,▲g. ▲ wasn't added until Actually.

user165474

Wait you made two answers that are just "inverses" of each other?

Pavel

@Mego Why don't you post that?

Anonymous

@Pavel Because it's very similar to Dennis's answer

Anonymous

And because I'm busy making an improved CP437 codec

Dennis

3:35 AM

@Mego Heh, I knew that ▲ wasn't implemented in Seriously (first thing I checked when I couldn't coerce Actually to use CP437), but using it to my advantage didn't occur to me.

Anyway, the Jelly/Actually-Actually/Jelly pair of answers is kinda neat.

Anonymous

I finally found the right codepage in Python, I think. oem should do the trick (requires >= 3.6)

Dennis

One more reason to upgrade TIO's Python 3.

Anonymous

But it's Windows-only

Dennis

:(

Anonymous

I'm working on a proper cross-platform OEM codec for Python

Mendeleev

3:41 AM

@Mego OEM?

Destructible Lemon

@WheatWizard no I want the 300 :P

Anonymous

OEM is the name used for the original CP437 codepage

Wheat Wizard

@DestructibleLemon How about I'll give you the 300 if you can golf it under 300.

Pavel

@DestructibleLemon That's not how this works.

Destructible Lemon

> I will straight up give 300 rep to anyone that can come up with a brain-flak/brain-flueue Trick or Treat Polyglot (before I do).

Wheat Wizard

3:44 AM

It is a bit unclear

Pavel

Bounties announced in chat are awarded on an honor system, which breaks down if you piddle over the entire spirit of the challenge.

Wheat Wizard

I was hoping for under 1000 bytes

I'll still give you 150 for being the first

Destructible Lemon

@WheatWizard I'll see what I can do

Pavel

o_0
My new tab page just crashed.

Wheat Wizard

I've done it in 140

so it is more than doable

Pavel

3:46 AM

WTF I can't load new tabs

It just dies

BRB restarting chrome

Destructible Lemon

@WheatWizard thanks

Pavel

I guess

user165474

4:23 AM

Wait so I'm confused: For this challenge what's the site-policy about ongoing problems that's been mentioned?

New Main Posts

0

Q: Create a vortex!

Your mission today is to create a vortex given a single parameter. This parameter determines the length of each arm in characters. Each "layer" of each arm contains one more character than the last. Here's how the vortex will look, given the arm length: 0: █ 1: █ ███ █ 2: █ █ █ █...

code-golf ascii-art

Anonymous

I fear I have angered the Python gods... What should be a simple codec is throwing errors for no reason.

Poke

@HyperNeutrino Here's my 2 cents chat.stackexchange.com/transcript/message/36768107#36768107

@Mego i hope your indenting is off

because python

:\

Anonymous

Nothing to do with indenting

Anonymous

Just encoding errors that shouldn't come up because everything is in UTF-8

user165474

4:37 AM

@Poke Okay thanks.

user165474

@Mego What exactly is the error being thrown? And also how is "Mego" meant to be pronounced, out of curiosity?

Anonymous

@HyperNeutrino 1) UnicodeEncodeError: 'charmap' codec can't encode characters in position 0-1: character maps to <undefined> (which is the most uninformative, useless error possible because the charmap does map those characters correctly). 2) Me-go.

user165474

Hm. That's odd. And okay, so long e?

Anonymous

Yep, long e

user165474

Cool. That's what I thought, just wanted to make sure.

Mendeleev

4:43 AM

@Mego ah

Pavel

> Windows Subsystem for Linux Gains Serial Device Support: Windows COM ports can now be accessed directly from a WSL process!

I'm going to pretend I know what that means and be happy anyway

Mendeleev

@Pavel You can access serial ports from Bash on Ubuntu on Windows

Pavel

Ok, I understood most of it. I just had to get the clarification that yes, a COM port is something completely irrelevant to me.

I don't have a lot of devices, at all.

/dev/
├── block
├── fd -> /proc/self/fd
├── kmsg
├── lxss
├── lxssclient
├── null
├── ptmx
├── pts
├── random
├── shm -> /run/shm
├── stderr -> /proc/self/fd/2
├── stdin -> /proc/self/fd/0
├── stdout -> /proc/self/fd/1
├── tty
├── tty0
├── tty1
├── urandom
└── zero

What's /proc/ for?

betseg

Lists processes, has info about cpu, etc

Pavel

ty

@NewMainPosts Does anyone else feel the definition of a vortex is unclear?

user165474

4:53 AM

I find it quite understandable.

user165474

I agree with DJMcMayhem though that there's no reason to restrict it to this one random character that's not an ASCII character (?)

Pavel

I don't really understand the way the arms are supposed to expand out.

A reference implementation would be really great.

ATaco

I made this

Which is a clientside editor for math.js, that uses ace's editor.

Pavel

How to run commands?

user165474

If you look at the arms, they go up 1 out 1, then up 1 out 2, then up 1 out 3, etc.

Pavel

4:55 AM

I typed 2+2 and it did nothing.

ATaco

Try print("Test") or plot(f(x)=x)

user165474

*
.**
...***
......****

Pavel

K

Ok, that's clearer.

ATaco

Also, eval("math.js"), if you want generic recursion.

user165474

Error: Undefined symbol math

ATaco

4:58 AM

Don't legitimately type math.js

user165474

lel

user165474

ik it wouldn't work because that would just be math.js as in math["js"] (I think, I don't JS)

ATaco

Well math.js isn't js

user165474

No?

user165474

ok then i don't know what i'm talking about >_> happens too often

Pavel

5:01 AM

Why isn't math.js js

It has js in the name.

user165474

JavaScript has Java in the name but Javascript != Java

Anonymous

If anyone can figure out why this isn't working, I'll give them a cookie

user165474

What version of Python? Just 3.x?

user165474

This doesn't solve the issue, but you probably don't want to be using input as a parameter name. Doesn't cause an issues though.

user165474

@Mego I'm assuming that the two empty classes don't really matter?

ATaco

5:23 AM

reverse(s)=
    s=="" ?
    s     :
    concat(
           size(s)[1]>1?reverse(s[2:size(s)[1]]):"",
           s[1]
          )

print(reverse("Hello, World!"))

That reverses strings.

Because a math tool needs to be Turing complete, for reasons.

user165474

>_< Nice.

Anonymous

@HyperNeutrino Not really. They just inherit the default behavior from the parents. They're not the part throwing the error.

user165474

Okay.

user165474

I'm still trying to figure it out >_>

Anonymous

@HyperNeutrino It doesn't cause any issues and it's not really discouraged in Python.

user165474

5:30 AM

Alright.

user165474

Anyway gtg now, 1:30 am

user165474

I might get it by tomorrow

user165474

I'll ping you if I find what's wrong.

user165474

o/

Pavel

Cookies seem to be a powerful motivation.

ATaco

5:46 AM

Running plot(plot) seems to crash the browser.

Nice.

Anonymous

6:22 AM

@Pavel They're the strongest motivation

Dennis

7:08 AM

You need decoding_map = {b:ord(CP437_TABLE[b]) for b in range(256)}.

@Mego I'll take my cookie now.

Anonymous

One cookie, coming your way

Dennis

:)

Anonymous

document.cookie = "DennisIsGreat=1;"

6

Anonymous

@Dennis pypi.python.org/pypi/pyoem

Anonymous

That adds an codec called oem437 that properly handles CP437 encoding and decoding

Anonymous

7:21 AM

I'll incorporate it into Actually soon

ATaco

7:40 AM

New Sandboxed Posts

7:50 AM

0

A: Sandbox for Proposed Challenges

Polyglot for min and max code-golf polyglot math Task Well, everyone loves Polyglots. You will be given two integers, in any standard form of input (no hardcoding). Your task is to write a polyglot which finds the minimum value in a language and the maximum value between the two in the other on...

Mr. Xcoder

What do you think about ^^^?

Destructible Lemon

8:11 AM

@ATaco but why is this here

Bassdrop Cumberwubwubwub

9:30 AM

> visited 498 days, 100 consecutive

awwwwwwww yis

New Main Posts

10:15 AM

0

Q: Contradictory Polyglots

Well, everyone loves Polyglots. You will be given two integers, in any standard form of input (no hardcoding). Your task is to write a polyglot which finds the minimum value in a language and the maximum value between the two numbers in the other language, and performs the following operations: ...

code-golf math arithmetic polyglot

Mitch Schwartz

11:53 AM

@DJMcMayhem am i correct in supposing that you've lost interest in discussing improving the site with me, or that you never had an interest in the first place?

user165474

12:27 PM

@ATaco IIRC There's a comment below that saying "Actually, what I'm wondering is how." :D

betseg

Posting code golf answers while staying in hospital, I think I have more problems then asthma :p

user165474

Oh :P :/ hope you get better soon

New Main Posts

12:45 PM

2

Q: Plus or minus polyglots!

Your submission must take a list of numbers (in whatever list format your language supports, or using multiple function / command-line parameters) or a string of numbers separated by any character that is not 0123456789. In one language, it must add all of them and output the sum. In another lang...

code-golf math number arithmetic polyglot

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