The Nineteenth Byte

AviFS

00:10

I'm wondering if the @ terminator would've been more useful if it terminated iff the bit that hit it was a 1.

Ie, how often is @ paired with a +, vs being used by itself.

(Then again, you might have to pair the proposed version with an = if you want it to terminate with a 0.)

Seggan

00:32

3 hours ago, by Seggan

so i think ive decided on my error strategy for rol

Whadda y’all think

OldSandboxPosts

01:00

Sandbox posts last active a week ago: Find Index of Rational Number in Calkin-Wilf Sequence, Split some points, (untitled)

lyxal

01:24

any last feedback on this?

Ginger

✅ Ginger approved this post now

New Posts

0

Q: Knook to Mate... With Portals!

Alternatively: Now you're checking with portals! Inspired this challenge I am somewhat of a self-declared Chess Anarchist. That means that when I play chess, en passant is forced (else the brick gets used), double check is mate (and pasta), and all sorts of new pieces and squares are added to the...

lyxal

01:42

@cairdcoinheringaahing the deadline for best-of nominations has passed

Ginger

hey wait that's my job

...which I will do tomorrow, because now is sleepy time

caird coinheringaahing

That's my job now :P

Ginger

don't you dare

we can wait a little longer

lyxal

looks like it's started :p

caird coinheringaahing

I've already locked the nominations post and am doing the comments now, sorry

Ginger

01:45

:>(

I'm so angry my eyebrows turned into my nose

lyxal

lol

caird coinheringaahing

I am slightly concerned at the number of uncontested categories tho

8/16 are uncontested, including multiple self-nominations

I am tempted to keep nominations open for another week or so to try to get more nominations

Due to the fact that 8 of the 16 Best Of categories are uncontested, nominations are remaining open for another week, until Feb 7, 2am UTC. Please, get in some more nominations!

6

@Ginger I am waiting a little longer

Ginger

noice

lyxal

and if there's still uncontested categories will the deadline be enforced?

caird coinheringaahing

Yes

At that point, any uncontested categories will be declared for the only nominee

If it were 2 or 3, I'd go ahead with voting now, but literally half are uncontested

lyxal

01:57

well we'll see if this announcement gets any better results than the last one

caird coinheringaahing

I haven't actually nominated anything yet, think I should probably do that :P

Rydwolf Programs

02:44

Unironic category proposal for next year: Most contribution to Best Of

It's not easy hunting down things to nominate

Seggan

@cairdcoinheringaahing huh?

Rydwolf Programs

Like categories where only one person was nominated

That person'll automatically win

I feel like I should completely start anew for how my chromebook SSD is organized

emanresu A

@RydwolfPrograms That's currently probably me

Rydwolf Programs

I've got Downloads (the root folder, ignore the name, it's a remnant from back when Chrome OS was way less capable), which contains over 2000 unorganized files (mostly screenshots), which contains Programs, most of which are JS projects of mine dating back about five years, then Random, which most of my newer projects are in, and with hundreds of files in the roots of each of those, then I've got a few random other subdirs, most of which haven't been opened in four years

Jo King

04:05

@AviFS i can't see anyway of shortening it. i do wish sometimes that ? was itself a collector with highest priority, that would be good for golfing

New Posts

07:42

0

Q: Create a bingo card generator

Bingo Bingo is a numbers game where players match randomly drawn numbers to the numbers on their cards. Each bingo card is a square grid with 25 spaces, and the columns of the grid are labeled with letters such as "B", "I", "N", "G", "O". The letters help to identify the number range in each colu...

number grid random game

New Posts

09:55

0

Q: What is the importance of SEO

In other words, SEO is essential because it increases the visibility of your website, which results in increased traffic and opportunity to convert visitors into paying clients. View the SEO tools available to you for the best rankings. example

math sequence

l4m2

@NewPosts This title could be an at-least-not-bad question though

mousetail

@NewPosts I thought it was a spam but the link is just example.com

@l4m2 How? I really wouldn't know how to make a golfing question from SEO. They are opposites, in SEO you want to write as long as possible

l4m2

@mousetail like giving definition and ask you to work out the SEO

mousetail

I don't think that would work

Stewie Griffin

10:43

Hi! I don't visit often anymore, so I just noticed that the number of challenges that are posted have gone down from around 10 when I used to write challenges 6 years ago to around 1 each day now. I tried my luck and posted a new challenge today, for the first time in well over 3 years.

mousetail

@StewieGriffin Yea 1 a day or every few days seems about average. Just not as many people writing challenges and each takes a lot longer to get ready to post I guess

Stewie Griffin

I don't know if "I still got it", and I don't know how the community has changed over the years... Anyway, hope you enjoy it.. :)

lyxal

I don't think the way challenges are written has changed much (apart from having more lax io rules) over the years

The thing that's really changed is the languages used

Things like fractional byte counts are now allowed

So you might see x.5 byte answers around :p

Fatalize

@StewieGriffin Yeah the activity of the site and chat is much lower than what it was in say 2016

PyGamer0

@emanresuA did DSO die or is it just that i cannot load it?

Stewie Griffin

11:00

@Fatalize <- but that's a familiar name at least ;)

Fatalize

@StewieGriffin Takes me back to years where I could slack more

Stewie Griffin

Yup... 2016 is three kids ago ;)

11

Q: Can we encourage more users to post challenges?

Recently, the challenge rate on PPCG has dropped. I haven't looked through the numbers all the way back, but we once had 9.9 questions per day. The number of questions per day is of course not the best measure since we want good question, not bad ones, and 90 % of everything is crap. There are...

discussion asking-questions

l4m2

7 of newest 50 questions are mine

4

Stewie Griffin

11:17

Keep going, and maybe you'll even surpass Calvin one day ;) codegolf.stackexchange.com/tags/code-golf/topusers

#legend

Ginger

12:00

@StewieGriffin Hi, welcome back to TNB!

UndoneStudios

12:30

Today marks my first anniversary of joining CGCC

3

Fatalize

@StewieGriffin You mean Helka Homba or whatever he had changed it to

UndoneStudios

12:54

Alright face it I can't understand SVGs in Scratch when you open them in Notepad

It's just confusing

mousetail

SVGs are pretty easy

UndoneStudios

Says the SVG guy

I understand it, but Scratch SVGs aren't

For parsing

Look at this:

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="95.17898101806641" height="100.04156036376953" viewBox="0.3210171699523926 0.3000000357627869 95.17898101806641 100.04156036376953" version="1.1" xml:space="preserve">
  <!-- Generator: Sketch 52.5 (67469) - bohemiancoding.com/sketch -->
  <g>
    <title>costume1.1</title>
    <desc>Created with Sketch.</desc>
    <g id="Page-1" fill-rule="evenodd">
      <g id="costume1">
        <g id="costume1.1">

Makes... not much sense

What do you understand from it

Well

I suppose

mousetail

13:24

@UndoneStudios You can delete half of it

SVG generated by most software is mostly garbage

Ginger

13:46

decided to do a little makina coding, here's my (untested) reverse Collatz conjecture program:

v>n0;
>wv >n0;
>O>?C!
^E vU>n2;
^  v>%   ;
;0nOOCJ< 3
^ v?OI>wJnv
^;v>^ v+>*J
^0H;1n< UCn0;
^nv    v<<<
PCH>n0;H
^U>wv<<<
^<<O<>n1;
;2n/>-
  ;0nC

aaaand it divided by zero

cool

mousetail

Would not recomend

caird coinheringaahing

@StewieGriffin Welcome back! It's been a while :P

Ginger

hmmmmm

something sus is going on

mfw one of the instruction pointers phases through a wall

alright I'm going to try something else, makina always makes my brain hurt :p

mathcat

14:06

@StewieGriffin 1.0m users reached o.0

Sandbox Posts

15:06

0

A: Sandbox for Proposed Challenges

Infinite Apple Dilemma I have encountered this type of puzzle, that usually involves apples, several times. It goes as follows: There is a certain number of apples in a basket. Ava takes a third of the apples. Bob takes a quarter of the apples that are left. Finally, Dennis takes one-sixth of th...

mathcat

Fun / too easy?

Seggan

fun and easy

mathcat

lol nice

Seggan

hmm its actually not that easy

i thought (1/3) * (1/4) * (1/6) * x = 10 would solve it, but no

mathcat

nah, more like this

should be pretty easy with recurse tho

Seggan

15:19

aaaah its subtraction i forgot

c--

16:35

any feedback on this? codegolf.meta.stackexchange.com/a/25026/112488

Ginger

hmm

might be a dupe? idk

c--

I couldn't find one if it is

Aiden Chow

man i want to nominate some of my own post in best of, but like its hard to compete with whats already there lol, im like 100% not gonna get voted

Seggan

do it

Aiden Chow

16:51

@Seggan ok well, here goes nothing (i really hope i win but like not gonna happen lmao)

Sandbox Posts

17:08

0

A: Sandbox for Proposed Challenges

Output a random value from the last 16 values outputted random code-golf Output the numbers 1-16 (or any other set of 16 distinct items). Then, repeatedly, output a random value chosen uniformly from the last 16 items outputted. After the same item is printed 16 times in a row or more, halt.

Rydwolf Programs

17:23

Ooh, the integral of sin² is surprisingly fun

Well, there's probably some simpler less fun way than the one I did, but the way I did it was fun at least :p

Sandbox Posts

0

A: Sandbox for Proposed Challenges

A randomly colored walk code-golf random color Given two inputs, a distance \$d\$ and a number \$n\$ output \$n\$ random colors which each have distance \$d\$ from the previous. Background A random walk is a path which is defined by choosing a random direction and (usually) fixed distance to go a...

mathcat

17:39

combo!

DLosc

@RydwolfPrograms I think I figured it out! That was fun.

c--

17:59

@Ginger nvm, I can already see the first python answer

c--

18:30

@RydwolfPrograms I got this:
I = int[ sin²(x)dx ] = int[ (1 - cos²(x))dx ]
2I = int[ (1 + sin²(x) - cos²(x))dx ]
2I = int[ (1 + cos(2x))dx ] (2x = y)
I = int[ (1 + cos(y))dy / 4 ]
I = y / 4 + sin(y) / 4 + C
I = x / 2 + sin(2x) / 4 + C

but I didn't find it too interesting, how did you solve it?

Sandbox Posts

0

A: Sandbox for Proposed Challenges

Toggle my Comments comments self-referential code-golf Write a program which takes a string as input. If the string is a syntactically valid comment in the program's language, the program must output an uncommented version of the string. Otherwise, it must output a syntactically valid commented v...

Rydwolf Programs

@c-- Integration by parts with sin * sin to get int[sin²] = -sin*cos + int[cos²], rearrange that to find int[cos²] in terms of int[sin²], then add those, giving int[sin²] + int[cos²] = x. Then plug in int[sin²] + sin*cos for int[cos²] and solve for int[sin²] on its own

Doing the trig identity stuff first like you did would've made more sense but I forgot about the double angle identities until after I'd done the integration by parts, and I honestly just really love finding integrals by solving equations for them

emanresu A

18:47

@PyGamer0 Probably that you can't load it, I don't host it myself so it almost never goes down

Rydwolf Programs

DSO's up for me

Ginger

same

Ginger

19:27

in Off-Topic TNB, 30 mins ago, by Ginger

@RydwolfPrograms would ya mind setting up a new subdomain on your droplet?

@RydwolfPrograms ^

emanresu A

Huh, I've been here for two years now. It really feels like more than that

Ginger

code golf ages you :p

mathcat

Wait what I joined 2 years and 7 months ago.

Ginger

Side effects of TNB may include: Accelerated aging, extreme tongue dexterity, full-body shrinkage, and loss of limbs.

Consult your doctor before taking TNB.

mathcat

@mathcat Ah yes wonderful

Ginger

19:35

> Best of Luck

~~In conclusion,~~

mathcat

"Is it an Arithmetic Sequence or not"

*to be continued*

emanresu A

@mathcat Vyxal, 2 bytes with the strict input format

mathcat

ಠ_ಠ

Seggan

@mathcat you should work on that

id like to answer

and please loosen the input format if you do

mathcat

idk, I do think that's a tad too trivial

Seggan

19:47

my first activity was a kotlin answer, and my first question was abt scrabble

mathcat

@emanresuA frick why do you have like 5-times my rep

Seggan

@mathcat i dont

mathcat

I hereby grant you permission to repost it

I've never really focused on posting answers, but I kind of want to hit the 100-answer mark

Rydwolf Programs

@Ginger Y'know pinging me in one room pings me in all of them right :p

Ginger

didn't know if you were logged out :b

Rydwolf Programs

19:59

Yeah but you'd still have pinged me already lol

Seggan

@mathcat how? ive got 148 in slightly over a year

mathcat

ik, I've just been posting challenges

emanresu A

@mathcat ~~skill issue~~

mathcat

sadge

DLosc

20:34

Lol, and I found a substitution instead:
(sin(x) - cos(x))(sin(x) + cos(x)) = sin²(x) - cos²(x)
= sin²(x) - (1 - sin²(x))
= 2 sin²(x) - 1
sin²(x) = (sin(x) - cos(x))(sin(x) + cos(x))/2 + 1/2
int[sin²(x) dx] = int[(sin(x) - cos(x))(sin(x) + cos(x))/2 dx] + int[1/2 dx]
Let u = sin(x) - cos(x), du = (cos(x) + sin(x)) dx; then we have
int[u/2 du] + int[1/2 dx]
= u²/4 + x/2 + C
= (sin(x) - cos(x))²/4 + x/2 + C
= (sin²(x) - 2 sin(x)cos(x) + cos²(x))/4 + x/2 + C
= x/2 + 1/4 - sin(x)cos(x)/2 + C

I was originally trying to do integration by parts (which is my favorite kind of integration) but I apparently forgor 💀 how it works and thought I couldn't apply it to this integral

The nice thing about integrals is that it's usually pretty easy to check you got the right answer by just differentiating it again

emanresu A

The "standard" way is to substitute (1-cos 2x) / 2 for sin^2 x

DLosc

20:49

Like Rydwolf, I forgot about double angle identities

Aiden Chow

21:25

@emanresuA yea thats what i wouldve done, super simple

AviFS

21:50

I know, I'm quick to suggest/start events, and I know events usually don't last long here. But they often sure start strong! And this is a one-time event anyway, so...

@cairdcoinheringaahing I propose we set up an event where we set up some search queries, and look through the questions and answers from this year together. Make a fun thing out of it, and just share cool things we find. We should additionally probably make another room for it.

Along the way, I'm sure we'll find plenty of things to nominate.

emanresu A

22:10

18 almost-identical answers lol

AviFS

22:24

I'm thinking in the new room, we'd have an event for like three days from 8pm - 11pm UTC. How does that work for people?

Of course, people would be there throughout the day, but events work better when there's a concentrated focus time.

AviFS

For future reference, I just spent way too long diagramming "American Time", "European Time" and "Australian Time" using VIC, PST, UTC. Those are UTC offsets of +11, -8, and +0. I think it's easier to think about if you center around PST. Then you get offsets of -5, 0, 8. Eg, here's 2pm PST. It gives 9am (-5) for AUS and 10pm (+8) for UTC:

      {24|⍵+¯5 0 8}14
9 14 22

Seggan

i just found the dumbest piece of code i ever wrote

val loaded = loadedDependencies.filter { it.pkg == pkg }
if (loaded.isNotEmpty()) {
    return loaded
}
return emptyList()

AviFS

Anyway, here's an hour by hour breakdown of what I think are the set of the five best hours for CGCC, from what I understand about our spread:

(The room activity backs this up, although I think it adds noise because 2 of the 3 clusters can be very busy at a time when the third cluster can't be online. In fact there are several such overlaps I found.)

|  VIC  |  PST  |  UTC  |
|-------|-------|-------|
|  6am  | 11am  |  7pm  |
|  7am  | 12pm  |  8pm  |
|  8am  |  1pm  |  9pm  |
|  9am  |  2pm  | 10pm  |
| 10am  |  3pm  | 11pm  |

@Seggan That's pretty funny. I've done stuff like that before. Sometimes, I think it helps with readability. But don't tell anyone on CGCC that :p

@Seggan Specifically, I feel like I've had logical stuff like that. Where there's like some logical expression and you could just return it, but I find it more readable to say if (expr) return true; else return false; except with line breaks and unnecessary brackets, and all that jazz. Sometimes something like that comes up in a ternary, but it's the same idea. I'll use a ternary to assign a value where I could've used a logical expression or an &&/|| short-circuit.

Not always, of course, but sometimes it just feels like two different cases. Even if logically you can express it as only one. So I code it however I was thinking about it, ie found intuitive.

It also has the benefit of allowing you to change the "else" case. Or change the ternary. Sometimes I find I want to do something in the else case. Like change some state, or notify something. Or just add a console.log for debugging. It's annoying to extend a simple return statement into a true/false case if it turns out you need to, but it's trivial, and satisfying, to collapse it.

Seggan

23:33

argh type resolution is such a pain

youve got possibly unqualified identifiers, star imports, local types, the distinction between unresolved and resolved types, plus the compiler-defined types

and packages may be split across multiple files

Transcript for