The Nineteenth Byte

SegFaultPlus4

12:30

@lyxal i got ophact

with the Rickroll

lyxal

gg

ophact

@SegFaultPlus4 Don't brag about it, next time you'll be the victim

SegFaultPlus4

ophact, we're no stangers to Rickrolling

you know the rules, and so do I

a full commitment's what i'm thinking of

you wouldn't get this from any other guy

lyxal

@SegFaultPlus4 that's a very [BIG SHOT] move of you

SegFaultPlus4

i just wanna tell you how i'm feeling

gotta make you understand

never gonna give you up

lmao i'm too powerful

ophact

12:41

Any feedback?

lyxal

You might want to clarify if the input will always be positive

And deverbosify the title a bit too

ophact

Yeah, I think that would be a good idea.

The input will always be positive

lyxal

Good

Don't forget to format the test case section

It's currently a markdown mess what you have

ophact

Oh yeah good idea

Should I use codeblocks or LaTex or what?

SegFaultPlus4

@ophact nice try

ophact

12:44

Yes I know

lyxal

Gosh dang it

@ophact I tried

Tried to make it convincing that is

SegFaultPlus4

du bist klug, aber ich bin kiuger als du

lyxal

Hey wait yesterday was Mario day

Or today if you're in a yesterday timezone

Why didn't anyone say so?

Ginger Industries

🅰🅰🅾🅱🅾🅾🅾🅾

SegFaultPlus4

I am now the Rickroll god

lyxal

12:49

You rickrolled one person

I've rickrolled more

We are not the same

Ginger Industries

even I have rickrolled >1 person

lyxal

Come back to me when you've rickrolled around 300 students at once

Then we'll discuss your rickroll rating

(it took a month of planning but that's something I actually did)

Ginger Industries

wow

ophact

Now, I actuallly really want feedback

See this link for the sandbox post

or perhaps this

I wonder which one it is

Ginger Industries

😑

lyxal

12:54

@ophact gee the intro is a bit wordy

ophact

Lemme see

That is actually true

lyxal

Could it be condensed a little?

ophact

Yeah

I could remove the background story

Ginger Industries

Do we really need to give you another lesson in meme economics?

lyxal

Like I understand that an example like that is helpful, but it does seem like a bit of fluff

ophact

12:55

Yeah

PyGamer0

@SegFaultPlus4 no.

ophact

indeed

lyxal

@PyGamer0 holy frick I just got nineteenth byte'd

Ginger Industries

@lyxal [insert message about failing as a crewmate]

PyGamer0

@lyxal get chatrolled lmao

ophact

12:56

@lyxal What would I replace it with

PyGamer0

@emanresuA i chatrolled someone

lyxal

@ophact a simpler explanation with maybe numbers instead of words and lists instead of newlines

May 11, 2021 at 1:23, by caird coinheringaahing

@lyxal frick, only 10/10 not 69/420? I failed as a crewmate, hella sus. Let me just go commit frick and die

Ginger Industries

@lyxal that's the one

lyxal

@PyGamer0 I didn't actually click the link I just previewed it and made a humorous joke

PyGamer0

Aug 9, 2021 at 7:51, by emanresu A

It's a chatroll

@lyxal :(

D:

lyxal

12:58

@PyGamer0 it is what it is

ophact

@GingerIndustries Sure, I would love to take that as a lesson

lyxal

@GingerIndustries it's an accurate impersonation of me by caird

Ginger Industries

hm

@lyxal permission to do something off-topic?

lyxal

@GingerIndustries you don't need permission from me to do that

High quality art

Ginger Industries

@lyxal awesome

in Sandbox, 4 mins ago, by Ginger Industries

Feb 25 at 21:58, by Fmbalbuena

in The Nineteenth Byte, 2 hours ago, by Ginger Industries

Feb 21 at 23:49, by user

Aug 17 '21 at 13:08, by PyGamer0

31 mins ago, by exedraj

9 secs ago, by Redwolf Programs

12 secs ago, by user

ass

mathcat

13:04

@lyxal woah

Bgil Midol

25 secs ago, by Ginger Industries

in Sandbox, 4 mins ago, by Ginger Industries

Feb 25 at 21:58, by Fmbalbuena

in The Nineteenth Byte, 2 hours ago, by Ginger Industries

Feb 21 at 23:49, by user

Aug 17 '21 at 13:08, by PyGamer0

31 mins ago, by exedraj

9 secs ago, by Redwolf Programs

12 secs ago, by user

ass

mathcat

@mathcat I did 30 at once

lyxal

@GingerIndustries besides, I'm the worst person to ask permission for silliness... I'm not a room owner, my run for room ownership failed and I'm a big fan of stupidity anyway and I frequently engage in doing so

@mathcat the joys of going to a school with fortnightly school wide assembly videos

Ginger Industries

@lyxal and that's why you're the best person to ask

mathcat

@lyxal ow

Actually, i made a new Joe record today

I Joe'd 5 people

lyxal

13:07

@mathcat Basically, I asked one of the teachers involved with the video production if I could slip a rickroll into one of the assembly videos. And because I was friends with this teacher, I was allowed to

Friends here meaning someone I played board games with at board game club

Man I got up to some shenanigans when I was at school

mathcat

lol

A teacher let you rickroll student?

lyxal

Yes

Ginger Industries

google translate be like

lyxal

@mathcat I was unironically sort of a teachers pet

Sort of

Like not fully like you'd expect

But enough to pull some strings and make them ring

mathcat

When I rickrolled a teacher, she was like ಠ_ಠ

Ginger Industries

13:09

> Sucking up can get you to high places. - Ginger Industries

lyxal

When I rickrolled teachers, they said haha funny Lyxal strikes again

So much so that the class photo for my software class had Rick astley in the background

Ginger Industries

is that exactly what they said tho

mathcat

because "lyxal"

lyxal

It's paraphrased

mathcat

@lyxal o.0

you gave me an idea!

lyxal

13:10

There's also that one time I enlisted a friend to make fake study posters

They had these little slips with a phone number and a website that were both rickrolls

mathcat

ah

wait ...

lyxal

And so we put them in places where people would most likely use them

mathcat

gimme that phone number!

lyxal

We got a few people

@mathcat Google the rickroll hotline

mathcat

a rickroll phone number?

@lyxal woah nice

I'm gonna do that too

lyxal

13:11

@mathcat Yep

Ginger Industries

@lyxal oh yea that

mathcat

maybe I'll try first with a website

lyxal

@lyxal I heard one story that someone rang the number in maths class

mathcat

wth rip

lyxal

Idk what happened after that but they fell for it

Ginger Industries

13:12

Oracle: what's your phone number
Me: *laughs in rickroll hotline*

lyxal

And allegedly, the principal went into the year 12 common room and took down the posters that we'd placed there

Which is kinda sad but also kinda funny that it somehow escalated that far

mathcat

Did he know it was you?

lyxal

I never got in trouble for it btw. It wasn't something to get in trouble for

@mathcat I doubt it

Ginger Industries

Lyxal ${LASTNAME}, Master of Trolls

mathcat

surprisingly, in my class only 7-10 people know about rickrolls

lyxal

13:14

My other highlights include taking over screenshare during a zoom class and using my student card to open a locked door to our morning classroom

mathcat

woah

lyxal

@GingerIndustries Alrada, according to GPT-3

@mathcat yet when graduating, I stil managed to get the citizenship award (or something like that idk it was 2 years ago)

Ginger Industries

Lyxal Alrada

mathcat

The only epic troll I made IRL was to ask a teacher play the video in spotify

Ginger Industries

hm

lyxal

13:16

All my trolling and I was still liked by people

I'd call that success

Ginger Industries

brb

mathcat

@lyxal rickroll rating: 1

lyxal

This isn't including other small ones where I'd get my friends via emails

mathcat

@lyxal oh right :( I forgor

SegFaultPlus4

@lyxal i'm going to rickroll my entire school of over 1500 students at the end of the school year

mathcat

13:18

I wanted to do one yesterday

SegFaultPlus4

then you will suffer for your hubris

@ophact imagine not having @GingerIndustries's rickroll defender

mathcat

wth where?

lyxal

not here

mathcat

thanks, now my searching range is a bit smaller

lyxal

Also not here

SegFaultPlus4

13:26

@mathcat here

mathcat

you know ... you can just preview the link

Ginger Industries

13:38

back

@mathcat here you go

PyGamer0

@lyxal technically you can make gtp3 generate names for me

from the existing names on CGCC

Ginger Industries

British Encanto be like "2.1336 meter frame"

Anush

14:01

if you are given a matrix with more rows than columns which doesn't have full rank, is there a method for choosing a set of rows with full rank?

Bgil Midol

@Anush define "full rank?"

PyGamer0

why do people consider lambdas to be "unreadable"?

python ones

Bgil Midol

idk

Ginger Industries

14:36

4

PyGamer0

wth

Radvylf Programs

he do be schemin tho

Ginger Industries

you're welcooclew er'uoy ✏

SegFaultPlus4

15:07

@GingerIndustries it's a trap

how do i know

i have a better Rickroll Defender

Ginger Industries

stop.

SegFaultPlus4

ok

Ginger Industries

the rickroll jokes have become detrimentally unfunny. stop making them.

SegFaultPlus4

but you can't be RickRolled if you just rickroll yourself

Ginger Industries

stop.

SegFaultPlus4

15:10

ok

jeez

Ginger Industries

let's talk about something else.

SegFaultPlus4

chill

@Anush just remove every row that doesn't contribute to the rank

oh yeah i'm still trying to golf the integers

Wheat Wizard

Is there a nice way to use mathjax to display polyominos for a challenge?

SegFaultPlus4

not that i know of

SegFaultPlus4

15:42

xkcd is very funny

Zenon

16:19

Dropping this in chat because I don't know if it's a question that has a right answer. I have a problem that 1) I can't figure out myself, 2) I'm trying to solve for recreational purposes, but 3) I might end up profiting from if it's solved. Is it kosher to still present here, given that I sincerely believe the problem itself has recreational value, or does the potential financial gain make it a conflict of interest?

Ginger Industries

@Zenon hmm

~~welllllll, that depends on how much of a cut you're willing to give us /s~~

but I'm probably the wrong person to answer this

@RadvylfPrograms your help is required

Radvylf Programs

@Zenon I think it depends purely on how interesting the challenge would be, and how well it fits the site standards.

Zenon

lol. I'm thinking I'd start an open-source app, and my only potential financial gain would be donations.

@RadvylfPrograms Thanks

Ginger Industries

an anonymous user appears!

Radvylf Programs

Challenges based off real-world problems usually aren't very fun in my experience. but if you sandbox it and it seems interesting I don't think any possible financial gain would matter.

Ginger Industries

16:24

I have a feeling I might know who they are

Zenon

Awesome

My main motive is that I like playing this game, and I want to find a way to generate all possible levels for a given board size en.wikipedia.org/wiki/Numberlink

PyGamer0

@GingerIndustries who?

Ginger Industries

@user18440846 If you're the person who needed to talk to me about Voxel Painter 2, leave this room. I'll invite you to a room where you can talk.

(I hope)

SegFaultPlus4

@Zenon sorry bud, free flow beat ya to it

Radvylf Programs

@GingerIndustries You know you can click on their pfp to see what account they're associated with, right?

Zenon

16:26

@SegFaultPlus4 The issue is that Flow Free has a finite number of levels. I've played them all.

Ginger Industries

@RadvylfPrograms it's not loading

Radvylf Programs

No need to bother some random user based on speculation about who they might be.

Ginger Industries

I told them to come here

hyper-neutrino

if they don't have 20 rep they can't talk anywhere

Ginger Industries

they don't

hyper-neutrino

16:28

unless explicitly permitted to by a moderator

Ginger Industries

¯\_(ಠ_ಠ)_/¯

Radvylf Programs

?

Ginger Industries

I need to stop getting distracted

Radvylf Programs

Good news, the district world languages coordinator has replied to my email

> I will gather more information about the best options that we can offer for you to be successful and get back to you as soon as possible.

This seems promising

Ginger Industries

I regret typing that

hyper-neutrino

16:41

i regret reading that as well

Ginger Industries

and now you don't have to

shame that code-golf euphemisms are hard to come up with

the article on the 2022 Russian invasion of Ukraine is now 13 sections long

and as long as it continues I will keep this PFP

mathcat

@GingerIndustries o.0

nice

Ginger Industries

glad ya like it

it's definitely good advertising for why you should have it

Radvylf Programs

17:00

I've gotten 13 spam emails from colleges in the last 24 hours

Every time I open my inbox there's more

And I'm not even in 11th grade yet

Ginger Industries

Jan 14 at 16:38, by Ginger Industries

@taRadvylfsriksushilani automated college spam Tinder

@RadvylfPrograms is this rate constant or does it change over time

Radvylf Programs

It has slowly increased over time

Ginger Industries

hm

you could probably train a neural net on these to generate more spam

Radvylf Programs

My theory is that the rate at which I receive college emails is proportional e^{-(x-h)^{2}}

hyper-neutrino

i will pretend i'm smart enough to visualize that

Ginger Industries

17:06

desmos time

Radvylf Programs

@hyper-neutrino It's a normal distribution shifted right

hyper-neutrino

ah

Ginger Industries

hyper-neutrino

i'd expect it to be a sigmoid

Radvylf Programs

I figure once I'm in college I'll stop receiving college spam

hyper-neutrino

17:08

i'd hope so

Radvylf Programs

The integral of this appears to be a sigmoid, interestingly

Not gonna bother actually integrating it though lol

hyper-neutrino

interesting

DLosc

17:23

@RadvylfPrograms Makes sense (tho yeah, off the top of my head I'm not sure how to integrate that)

Radvylf Programs

17:38

Finally got all caught up on history and math homework, four hours before sping break lol

DLosc

\o/

mathcat

/o\

DLosc

\ /
-O-
-O-
/ \

mathcat

  -
 / \
/-o-\
\-o-/
 \ /
  -

ಠ_ಠ

Radvylf Programs

Ooh the derivative of e^{-x^2} looks cool:

mathcat

17:46

woah

nice

Radvylf Programs

-\frac{x}{-e^{-x^{2}}} looks like tanx lol

mathcat

I read that as tanks

Speaking of tanks...

DLosc

TIL that the hyperbolic trig functions are analogues of the ordinary trig functions, but defined using the hyperbola rather than the circle ⍤

Radvylf Programs

Wait what else would they be

ophact

ALTAIL that

(A long time ago I learned...)

Not that long ago actually

DLosc

17:59

I didn't know what they were or why they were named what they are

Just that they're some combinations of exponentials that people thought were important for some reason

ophact

CMQ: is it Arctg, arctan, Arctan, arctg, Argtan, Argtg or something else? Why can't I find consistent notation for this function?

mathcat

hmm

I always write arctan

ophact

Yes so do I

Radvylf Programs

^

DLosc

For arctangent?

ophact

18:01

yes

I write arctan but my textbook thinks it's arctg

Unrelated String

atan
or tan^-1

Radvylf Programs

Arctan for math, atan for computer stuff

DLosc

arctan or atan (or possibly tan^-1)

ophact

Okay thanks for the responses

mathcat

and argtg to annoy teachers

Radvylf Programs

18:02

I don't like tan^-1 because tan^2 is tangent squared...but tan^-1 is very much not the reciprocal of tangent

DLosc

^

ophact

^^

mathcat

^^^

ophact

(obligatory reference to Radvylf's challenge)

Unrelated String

^^^^

also i find argtan funny
like presumably someone just misheard arctan
but then it like half made sense through some confused analogy with argmax/argsort

ophact

18:05

Confusing part is that the inverse hyperbolic functions are like Argcosh IIRC

Neil

18:48

@DLosc there isn't a closed form for that integral, except for the definite integral between -Inf/h/Inf (pick any two)

mathcat

CMC: Given a list and n, from the nth element of the list print every nth element until you reach list[-n]

Bgil Midol

19:07

Python, 18 bytes: lambda: x,n:x[n:-n]

mathcat

I get SyntaxError: invalid syntax

but it should print every nth element

eg. [1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 2 is [3, 5, 7]

Bgil Midol

lambda x,n:x[n:-n:n]

DLosc

@Neil Ah, interesting

Most confusing intersection: South East Street & East South Street

New Posts

19:42

0

Q: The maximum liberty of a group on a Go board

Warning This is not an easy challenge. You have to devise an efficient way to compute a function that has no proven formula to compute fast. Only several conjectures of such formula exist. If you can find and prove a method to compute this function with significantly reduced time complexity, it m...

emanresu A

19:53

@PyGamer0 I am proud, my child

mathcat

Pygamer's rickroll value += some positive integer

Seggan

CMC: given a string, find the starting indexes of any sequence of the letter a. i.e. given 555a555aa87889aaa98a, return [3, 7, 14, 19]. Credit to @mathcat for the idea

Unrelated String

20:13

Jelly, 6 bytes

1-indexed but it can also be 0-indexed for the same length lol

Newly Featured Posts

9

Q: Find the magic numbers to divide a number without division

An integer \$x\in[0,2^{32}-1]\$ divided by an integer \$d\in{[1,2^{31}]}\$ will produce an integral quotient \$q\$ and a remainder \$r\$, so that \$x=d\times q+r\$. Any \$q\$, in fact, can be calculated by the following formula. $$y=\left\lfloor\frac{mx}{2^{32}}\right\rfloor\\q=\left\lfloor\frac{...

code-golf math number-theory division

emanresu A

Very similar CMC: given a boolean list, find the indices of starts of runs of 1s

Unrelated String

^

Radvylf Programs

@emanresuA Pseudocode: [0,...input].deltalist().truthyIndices(x=>x==1)-1

emanresu A

JS, 44 bytes: a=>[...a.matchAll(/[^a]a/g)].map(x=>x.index)

Wait no, the regex can be a+

Unrelated String

20:19

Jelly, 4 bytes that aren't a trivial modification of my previous solution

mathcat

@UnrelatedString wait how does it work?

pxeger

@emanresuA Python, 56 bytes: lambda a:[i for i,(x,y)in enumerate(zip([0]+a,a))if x<y]

Zsh, 27 bytes: nl|uniq -f1|grep 1$|cut -f1

(actually really idiomatic Zsh code for once!)

Unrelated String

@mathcat indices of a, filter out indices + 1

mathcat

ah, ok

pxeger

Pure Zsh, 43 bytes: for i ({1..$#}){((p<$1))&&<<<$i;p=$1;shift}

alternative: Zsh, 43 bytes: for ((;i++,#;)){((p<$1))&&<<<$i;p=$1;shift}

Zsh, 41 bytes: for ((;x=${@[++i]},#x;p=x))((p<x))&&<<<$i

actually shorter after many attempts

@pxeger this can be 26 bytes: nl|uniq -1|grep 1$|cut -f1

Seggan

20:39

argh more Java Syndrome

pxeger

I have exactly the opposite problem when I write C-style languages lol

mathcat

I always forget the brackets when writing JS code

Seggan

20 hours ago, by Seggan

argh im too used to java

emanresu A

20:54

@Seggan Same lol

DLosc

21:12

@Seggan Pip, 7 bytes: a@*`a+`

@emanresuA Pip, 7 bytes: Jg@*+X1

which is just "join the list into a string and use regex like in the other CMC"

Unrelated String

@RadvylfPrograms oh yeah porting this gives Jelly, 3 bytes (0-indexed)

Seggan

21:27

stares at footer

Unrelated String

cba to come up with a new test case so

(since it's for the boolean list one)

DLosc

21:39

@UnrelatedString Not quite--that doesn't work when the array starts with a 1.

(as I discovered while trying to port it to Pip)

Unrelated String

ah

oh yeah of

DLosc

I think ŻIẹ1 works

Unrelated String

c

yeah

DLosc

Which in Pip is... 13 bytes. B-_MPgPE0@*:1 :P

Radvylf Programs

I just rickrolled myself rip

There was an assignment at the start of latin where we were supposed to make sure we could upload media files properly (it didn't count for a grade), and I chose to upload a rickroll.

And a few minutes ago I was going through my old submitted assignments

And I clicked the link >-<

DLosc

21:47

The self-rickroll is one of the highest forms of rickroll, second only to the Rick-rickroll

@DLosc 12 bytes: g-(HgPE0)@*1

emanresu A

@DLosc Do you want to continue our chess game?

DLosc

@emanresuA Oh, that was you? X^D I thought it was mathcat

Yes, but I'm at work right now

emanresu A

Oh, ok. Play when you want to

Seggan

@RadvylfPrograms Copilot once rickrolled me 🤣

DLosc

@emanresuA 👍♟

emanresu A

21:51

@Seggan Nice

@DLosc Wait, there are chess piece emoji?

Radvylf Programs

Yep, for every piece IIRC

DLosc

@emanresuA Dunno if there are others--that's the first one I found

Radvylf Programs

In the same block as the card suits and stuff IIRC

Chess symbols in Unicode

Chess symbols are part of Unicode. Instead of using images, one can represent chess pieces by symbols that are defined in the Unicode character set. This makes it possible to: Use figurine algebraic notation, which replaces the letter that stands for a piece by its symbol, e.g. ♘c6 instead of Nc6. This enables the moves to be read independent of language (the letter abbreviations of pieces in algebraic notation vary from language to language). Produce the symbols using a text editor or word processor rather than a graphics editor.In order to display or print these symbols, a device must have...

Seggan

i2symbol.com/symbols/chess

Radvylf Programs

They have their own wikipedia article lol

Seggan

21:52

we can finally play chess in the console

emanresu A

♔
 ♛
  ♚

Checkmate.

DLosc

So, not technically an emoji I guess.

Seggan

why not?

DLosc

I guess I think of anything that renders in $defaultFontColor against $defaultBackgroundColor, like a letter glyph, as "not an emoji."

emanresu A

I guess, yeah. Sadly, they aren't valid variable names in JS

DLosc

22:15

Aha! The black chess pawn is sorta-kinda an emoji, but only since 2018; I think the other symbols are still not emoji.

Fmbalbuena

Who can answer this?

6

Q: Reveal all clues of Black Box

Black Box is a board game, Your task is to reveal all clues. What is black box Black box is a board game with hidden atoms, Your task is given input, All atoms, reveal all clues. I/O Input The atoms can be any 1-char that is not newline (Used for separator) Like this. O.... ...O. ..O.. ..... .......

code-golf board-game binary-matrix

Sandbox Posts

0

A: Sandbox for Proposed Challenges

Can you decrypt me? Cops, post obfuscated code that can encrypt a number. Robbers, write some code that decrypts the original cop. (Unfinished.)

DLosc

@DLosc Alternate 12 bytes: gZ(gPE0)@*^t

Operator precedence is not cooperating with me on this one :P

Sandbox Posts

22:55

0

A: Sandbox for Proposed Challenges

Sort numbers in a ragged list Given a ragged list, e.g. [ [4, 7], [5, 3, [], [6, [2]]]] Your challenge is to sort only the numbers in in it. For example, with the above, the result would be [ [2, 3], [4, 5, [], [6, [7]]]] This is code-golf, shortest wins! All numbers will be unique positive int...

DLosc

@emanresuA tinylisp, no library, 92 bytes:

(d G(q((P L I)(i L(i(l P(h L))(c I(G(h L)(t L)(a I 1)))(G(h L)(t L)(a I 1)))L
(q((L)(G 0 L 0

That repetition of the recursive call is painful

78 bytes, returns the indices in reverse order

emanresu A

TIL that explicit: False works as a type annotation in python

DLosc

49 bytes using library functions

Bgil Midol

23:11

@DLosc That's 53 bytes for me.

@DLosc That's 82 bytes for me.

DLosc

in tinylisp and Appleseed, Feb 1 at 16:50, by DLosc

If a function isn't recursive, you can submit it as an anonymous function and save the four bytes from (d f. You'll still need the (d f for the TIO, but you don't have to count it as part of your code.

Bgil Midol

Oh.

Transcript for