The Nineteenth Byte

DLosc

17:03

TFW you start writing up a meta post thinking you've figured everything out, but then you realize there's a case you hadn't considered and you have no idea what you think is the right answer for that case. :^/

@Razetime A caird cairn, as it were

thejonymyster

@DLosc just mention it maybe? :P

DLosc

@AviFS I mostly read fiction these days, but I have been off-and-on working my way through Gödel, Escher, Bach, which sounds like it might fit what you're looking for if you haven't already read it.

Radvylf Programs

@mousetail There could be an observability issue with this

Well, I guess not, as long as the random is uniform

You could in theory run it a hundred quadrillion quadrillion times and see if the number of correct sorts matches what you'd expect for 1000 attempts each

Although you'd have to be careful to not accidentally allow just calculating by hand what the odds are, then just having a random chance to either randomly shuffle it or sort it with quicksort

Adám

17:25

@DLosc GEB is awesome!

DLosc

I'd heard it recommended as the ultimate math nerd must-read book for a long time and finally decided to take the plunge this year.

I'm enjoying it so far; the problem is, my local library system doesn't have a copy, so I have to get it through interlibrary loan, and I don't get very much read before I have to return it.

caird coinheringaahing

@DLosc Even partial meta answers can be useful :P

mathcat

@DLosc Wasn't Bach a composer?

caird coinheringaahing

Do you mean "composer"?

mathcat

ups

user

17:30

@pxeger Cool. Completely unrelated but does anyone have tips for getting a gold badge in code-golf? :P

@cairdcoinheringaahing He was a component of the Earth system

pxeger

It's not very easily gameable I think unfortunately

the FGITW effect is your best bet

caird coinheringaahing

@user Post a bunch of answers

user

It wasn't a serious question lol but thanks

Quantity over quality amirite

caird coinheringaahing

If you post 1000 answers, and get an average of 1 upvote per answer, you'll get it :P

DLosc

@cairdcoinheringaahing @thejonymyster True. I'll probably rearrange the order of topics to put the "I'm not sure about this one" last.

@mathcat Yes. Music can be quite mathematical, and apparently J. S. Bach's music was more mathematical than most.

user

17:32

@cairdcoinheringaahing I actually just need 249 answers. Epic trolling, here I come!

Adám

@DLosc Like Escher's drawings, and in both cases, the creators seemed mostly unaware of it.

Radvylf Programs

I was gonna comment about how I'm ridiculously far from even a silver code golf badge, but I'm only four upvotes away now :o

DLosc

s/far from/close to/

user

@Adám I thought Escher was aware that his work involved hyperbolic geometry

caird coinheringaahing

Hmm, I average 2.15 upvotes per answer on code-golf answers

Adám

17:35

@user No, some people tried to tell him about the maths involved, but he didn't understand.

user

@cairdcoinheringaahing But that average probably also includes your early answers, right? It's probably much higher if you include the last year or so

@Adám lol, interesting

caird coinheringaahing

@user I've averaged 4.41 upvotes/answer posted in 2022

user

That's pretty good

How'd you find out how much your rep increased in 2022?

Radvylf Programs

Probably rep tab graph

caird coinheringaahing

I didn't, I counted up the scores of the 29 answers I've posted this year

user

17:40

Oh ok

mathcat

ya know what

caird coinheringaahing

Net rep change would also include challenge rep, the rep cap, and bounties

user

What

mathcat

I average 16.66 upvotes/answer posted in 2022

user

Ah yeah

@mathcat Do you only have like 2 answers lol

mathcat

17:40

@mathcat (I posted 3 answers)

caird coinheringaahing

In the past year, I averaged 5.3 rep/answer

@mathcat Upvotes, or rep?

user

@cairdcoinheringaahing Losing your touch, are you? :P

mathcat

upvotes

it's because of my scratch answer

oh wait

caird coinheringaahing

@user Between 13/09/2021 and today, I've posted 68 answers. 29 of them were in 2022

mathcat

I sorted by score lol

user

17:42

My average this year is 4 upvotes per answer (I only have 4 answers: 4, 4, 3, 5)

@cairdcoinheringaahing Wait a second, did you just count these manually too?

caird coinheringaahing

Nah, did some regex capturing on the search page

user

@cairdcoinheringaahing ngl, I was confused for a second by that date there :P Does that mean you posted 68-29 answers (too lazy to compute) in just 3 months?

caird coinheringaahing

Ctrl-A on the page, then search for (\d+ votes)

@user Yes

user

Ah cool

Vivaldi doesn't have an option to search with regex :(

caird coinheringaahing

I didn't use Chrome or anything, I just copied the entire text into TIO and regex matched :P

user

17:45

Ohh

DLosc

I can't be bothered to count all 202 of my answers this year, but over my last 50 answers my average score is 1.78

Significantly lower than my overall average of 2.40

mathcat

feedback?

user

How do y'all post so many answers?

Like, do you go for easy questions or are you just that good?

caird coinheringaahing

Bored

DLosc

caird coinheringaahing

17:49

Like, 2020/2021 I was basically doing nothing all day, and I'm already a night owl, so I was spending 10am - 2am on CGCC

I was running out of the moderation side of stuff to do, which I prefer doing, so just ended up writing a bunch of answers

mathcat

When I'm bored, my fingers automatically type "youtube" and not "codegolf"

DLosc

@user But yeah, I mostly go for questions that will be easy in the language I choose.

Radvylf Programs

@mathcat I have about a 50/50 chance of typing a c or y and letting it autocomplete

DLosc

Every once in a while, I like to tackle something more complicated, but usually I code golf to get that endorphin hit of accomplishing something in 1-5 minutes.

mathcat

@RadvylfPrograms you should make an extension which has a 50/50 chance of typing either c or y

caird coinheringaahing

17:52

I just keep CGCC and YT always open on my laptop :P

mathcat

I'm tabophobic

I hate it when there are more than 20 tabs open

caird coinheringaahing

I have a window open with 60+ tabs right now :P

That's not even my CGCC window

Unrelated String

is that supposed to be a lot

i've got 125 in my cgcc tab

*window

caird coinheringaahing

It is for my laptop, running chrome and another application basically bricks it :P

Unrelated String

161 in one of my school windows

DLosc

17:55

Once it gets to the point where I can't read the titles on each tab, I start looking for tabs I'm not using anymore and closing them.

Unrelated String

196 in the other one

caird coinheringaahing

@DLosc Yeah, same

Adám

I've got FF with 21 tabs, FF with 8 tabs, and Edge with 4 tabs.

Unrelated String

i'm on firefox so the minimum tab width is wider than just the favicon :P

Radvylf Programs

I never have more than 10 tabs if I can help it, 20 or 25 if I'm too lazy to close one-off google searches while writing Rust

DLosc

17:57

@UnrelatedString Having to click an arrow to see more tabs counts as "I can't read the titles on each tab" :P

caird coinheringaahing

I had like 300 tabs open on safari on my phone, until I finally cleaned them up a couple of months ago

Adám

Of the 21 tabs in a single FF window, 8 are pinned, so that saves on width.

caird coinheringaahing

Some of the tabs I hadn't opened in literal years

user

@cairdcoinheringaahing You probably know this already but you can set it to close tabs automatically after like 3 months

caird coinheringaahing

I just have better tab control now :P

Unrelated String

18:02

@cairdcoinheringaahing i think that's most of the 500 tabs on my phone's safari :P

mathcat

18:15

that's a lot of tabs

thejonymyster

18:28

i used to have a lot of tabs

because my browser would let me access whatever i had open previous session

but now it doesnt do that so i never exceed like... 10 tabs :P

mathcat

why though?

Is it an office laptop?

thejonymyster

oh, no clue why it doesnt do that now. but it stopped encouraging me to use that feature to save things for later, so i suppose its for the best

like if it crashes i still can get my stuff back usually

but not regular closing

Mayube

speaking of office laptops, I'm currently wasting InfoSec's time getting them to audit AutoHotKey so I can get it installed on my office laptop.

The hoops we have to jump through when employees can't be trusted with tech

pxeger

18:47

I have 4 pinned tabs, plus currently an extra 7 active tabs and one new (about:blank)

that's across 2 windows

thejonymyster

@Mayube audit? as in like, get the company behind it investigated? or

Mayube

@thejonymyster No, as in they have to look it over and make sure it isn't malicious and doesn't have any security flaws they should be concerned about

We don't have admin access on our work laptops, so we need to get service desk to install software for us, and if it's not Microsoft software, it needs approval from InfoSec first

graffe

As a masochist I am thinking of a restricted complexity challenge

But I need to gird myself against the negativity .... It's tough

thejonymyster

@Mayube i mean that seems reasonable? am i missing a nuance?

Mayube

@thejonymyster I never said it was unreasonable, it's just tedious

caird coinheringaahing

18:53

AutoHotKey is a pretty well known bit of software. It's kinda like auditing Spotify

Not necessarily unreasonable, but is it entirely necessary?

mathcat

^

graffe

What is autohotkey?

Mayube

@cairdcoinheringaahing hence the problem with blanket policies. ANY non-Microsoft software, no matter how reputable, no matter how endorsed by Microsoft it might be, must be audited by InfoSec

pxeger

Depends what your InfoSec department's goals in "auditing" the software are, but I could see them rejecting AHK because it allows arbitrary scripting

so a virus could theoretically be delivered in .ahk form instead of .exe and then be much less likely to be detected by antivirus, for example

mathcat

@graffe It's a programming language designed to automate stuff.

Mayube

18:59

@pxeger oh yeah for sure, and AHK also installs itself at the driver-level for mice and keyboards IIRC, which is also a potential security risk as malicious software at that level could act as a keylogger

pxeger

I think you can write a keylogger in like 10 lines of AHK code

Mayube

the good news is I have 0 intention of ever running 3rd-party scripts of any kind, I just need my macro keyboard

att

not sure how to feel about dvd logo catching up to random point on sphere

at least it's slightly less trivial I guess

pxeger

19:18

the HNQ lottery always produces funky answer scores

it's at least partly because network-trusted users get enough rep (101) to upvote, but not downvote

caird coinheringaahing

And, for some reason, people upvote "Mathematica has this builtin" answers

pxeger

They are amusing

but not really that useful

@pxeger although not in this case; I don't think your answer is downvote worthy

@NewPosts CMC: this but just code-golf, and reveal your languages

att

yeah my 3rd highest is also a "hey there's this built-in"

past that they're mostly reasonably effortful

mathcat

where, in mathse?

att

19:39

@pxeger Print[2Set[,2,]^0], mathics^2=mathematica

pxeger

my attempt: Zsh -F + Python: [ exit(4)]

thejonymyster

@cairdcoinheringaahing instead of answering a mathematica builtin, there should just be a checkbox on each question for it :P

emanresu A

@Bubbler Possibly if you have two people close each at once... I kinda want to try now lol

caird coinheringaahing

@pxeger Yeah, this works. I've almost done this before, because I realised an old question was closed as a dupe of A but should have been closed as a dupe of B, and a new question was closed as a dupe of the old question and B.

DLosc

19:55

@pxeger Since it's a CMC, I'm gonna disregard the "not two versions of the same language" rule and do SQt, Pip Classic^2 = Pip 1.1

The SQ operator was added since Pip Classic. Before, SQ was just an identifier, which is a no-op in this context.

thejonymyster

CMQ: are any repdigit numbers in base ten also perfect squares? im pretty sure no, but idk how to verify

or i guess not a cmq just a q lol

caird coinheringaahing

1

New Posts

0

Q: I'm Blue, Da ba dee da ba die

Write a program, which outputs I'm Blue, and then Da, Ba, Dee, Da, Ba, Die, forever, without any trailing newlines, and it must pause half a second after printing each word. Also, the text should be outputted in the color blue 0x0000FF. So the output must be something like this: You can use an...

att

@thejonymyster not that are >1 digit zbmath.org/0072.26503 les-mathematiques.net/phorum/file.php/2/3765/superman_pb.pdf

caird coinheringaahing

20:10

@thejonymyster Repunits are the form (10^n - 1)/9 for n digits, meaning that a repunit is only a square iff 10^n - 1 is square, which, for n > 1 is false. Repdigits are k times a rep unit, and so, if a repunit isn't square, then neither is a repdigit

thejonymyster

ty both

DLosc

Brute-force proof that single-digit numbers are the only square repdigits:
The final two digits of N^2 are determined by the final two digits of N. Checking all 100 possibilities and eliminating the ones that end in two zeros, we find the only remaining options are 12, 38, 62, and 88, all of which end in 44.
So any repdigit square must consist of all 4s. But then it would be 4 times a repdigit consisting entirely of 1s, which (since 4 is a square) would have to be a square itself.
We've already established there are no squares that end in 11, so there cannot be any repdigit squares that con…

(clumsy and ninja'd twice)

thejonymyster

ty as well

pxeger

@cairdcoinheringaahing and 4 and 9 obviously

does 0 count as a repdigit?

caird coinheringaahing

Don't think so

DLosc

20:12

Why not tho

att

i'd count it

Radvylf Programs

I think it should

caird coinheringaahing

Technically, 1, 4 and 9 aren't repdigits either

Radvylf Programs

No way you'd reasonably represent 0 doesn't consist of 0 or more 0s and no other digit

caird coinheringaahing

> repeated instances of the same digit

Radvylf Programs

20:13

Does one of something count as a repeated instance of it?

caird coinheringaahing

Integers less than 10 don't have repeated instances of the same digit

@RadvylfPrograms Almost by definition, no

If something happens once, it doesn't repeat :P

att

@att these show there aren't any perfect powers (not just squares)

emanresu A

I was just about to try and do that

caird coinheringaahing

That's easy, use induction: it holds for n = 2, so we assume it holds for arbitrary n. Ez

DLosc

Looks like there are square numbers that end in 444 but none that end in 4444.

1. Base case
2. ???
3. Profit!

caird coinheringaahing

20:17

@DLosc Honestly, this is how I approached induction proofs until I actually understood them :P

"Okay, we establish the base case. Then, we pick n = k for some k, do some algebra, and proof"

graffe

20:40

@mathcat if there isn't a Linux version it doesn't exist :)

CMC given a three digit number, output a square number that ends with those three digits.

or output that no such square number exists

DLosc

Can the "output that no such exists" be by throwing an error?

mousetail

@RadvylfPrograms True, but this counts for all problems requiring implementing a specific algorithm

graffe

@DLosc sure

DLosc

Haskell, 40 bytes: f n=[x^2|x<-[0..999],x^2`mod`1000==n]!!0

graffe

20:56

@DLosc very nice

@DLosc what proposal can be solved?

DLosc

What do you mean?

graffe

How many three digit numbers are the last three digits of a square number?

A small proportion is my guess

Radvylf Programs

@mousetail Yeah, it does

That's why those are typically closed

DLosc

@graffe Looks like 159 (if you count one- and two-digit numbers as having leading zeros)

DLosc

21:36

@graffe Porting my Haskell solution to Pip gives 13 bytes: @:_%m=aFISQ,m

Ginger

21:52

wake up babe new What If? just dropped

caird coinheringaahing

What If a new What If? is dropped?

Ginger

that's... what happened

What If? 2 released today

caird coinheringaahing

The book? Been meaning to pre-order that, guess I'll pick it up at a bookstore instead :P

Ginger

head on over to my local Barns and Noble and buy every copy they got

DLosc

Next What If? episode: What if one person tried to buy every copy of What If? 2?

caird coinheringaahing

22:03

Randall would make a lot of money :P

forest

22:22

Y'all ever work on polyglots?

user

22:45

I had a classmate who could speak 5 languages once. I worked with them, but not sure what working on a person means :P

forest

Polyglot (computing)

In computing, a polyglot is a computer program or script written in a valid form of multiple programming languages or file formats. The name was coined by analogy to multilingualism. A polyglot file is composed by combining syntax from two or more different formats. When the file formats are to be compiled or interpreted as source code, the file can be said to be a polyglot program, though file formats and source code syntax are both fundamentally streams of bytes, and exploiting this commonality is key to the development of polyglots. Polyglot files have practical applications in compatibility...

Radvylf Programs

user's just being funny

forest

oh

Radvylf Programs

Yeah, polyglot challenges are pretty common here

forest

In just languages, or in file formats and languages?

And if the latter, then is including PDF cheating since the format is so fuzzy? :P

caird coinheringaahing

22:56

The typical rule of polyglots is that the bytes have to be the same, so you can have a polyglot with PDF being one of the languages

DLosc

@user It usually means surgery

caird coinheringaahing

Piet has been a polyglot language a few times on the site

att

23:10

@DLosc or personal growth

Bubbler

@DLosc 4444 % 16 = 12, which is not a square mod 16

Another way: (12 mod 16) is 4 times (3 mod 4)

Also feedback?

user

@DLosc ah, I’ve usually heard it used like a lighter version of “manipulate” (like a salesman working on a potential customer)

emanresu A

23:53

LYAL?

lyxal

Either prolog or labyrinth by the looks of it

Or F#

Transcript for