The Nineteenth Byte - 2021-10-30

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hyper-neutrino

00:04

oh, okay :p good to know I have statistical proof that I don't have a life

5

Redwolf Programmed

I think I'm (numerically) the first or second most talkative person normally in this room, so if I continued to be active for the next decade and nobody's amount of chatting per day changed, I'd reach first or second eventually

Although that's probably because I'm 16 and have literally no responsibilities other than some high school work which is mostly a joke

So I can afford to spend 8 hours a day or more here

emanresu A

00:21

CMQ: Should donuts have holes?

lyxal

Yes

DLosc

00:43

Yes, but I like bagels better

Jo King

00:58

@emanresuA at least two in my opinion

emanresu A

ಠ_ಠ

Redwolf Programmed

01:44

@emanresuA Yes, otherwise I wouldn't consider it a donut

I know it is, technically, but in my heart it's not a donut

@DLosc But...that's like comparing apples to tomatoes. They're totally different foods, just with a similar shape.

user

@emanresuA I like my donuts with donut-sized holes in them

hyper-neutrino

I like my donut-holes with hole-sized donuts in them

user

@RedwolfProgrammed Bagels are better than apples and apples tomatoes:p

@hyper-neutrino Really? Most like their donut holes with donut-sized donuts around them :p

But I like donut sized holes in my donuts because I hate donuts

Redwolf Programmed

02:00

I wonder if donut holes are ever actually made from the holes of donuts, or if they're just formed out of separate balls of donut dough

DLosc

@RedwolfProgrammed Sure, and I'm saying "you asked about tomatoes, but I'd much rather eat an apple" :P

Redwolf Programmed

Yeah but...you'd eat them in totally different contexts :p

Jo King

02:59

topographically, a jelly donut is the same shape as a mug filled with jelly

Redwolf Programmed

A handle-less mug?

Oh wait I'm thinking of a different kind of jelly donut

The kind that pretends it's a donut but actually doesn't have a hole and is therefore just an ambitious pastry

lyxal

@JoKing how tf you gonna fill a physical mug with digital bytes?

Doesn't make sense does it.

Okay so hopefully now I start getting 5g reception on my phone

Because nothing changed after the first covid vaccine, leading me to suspect the free 5g from the government only comes into effect after the second

1 hour later…

PyGamer0

04:18

@emanresuA holy donuts lol

emanresu A

04:37

@lyxal No, you become a 5G tower after the second.

lyxal

@emanresuA ah so that's why I'm not getting 5g reception

I feel scammed

emanresu A

05:04

When's your next dose booked?

lyxal

@emanresuA 2 hours ago

emanresu A

Nice! It takes a couple days to finish transforming you, so give it a bit.

lyxal

ah okay

good to know

PyGamer0

05:25

CMC: Make a perceptron.

Anush

05:44

Hi all

PyGamer0

also i have my ieolympiad

@Anush hi o/

Anush

06:00

How things?

PyGamer0

06:54

@Anush internet == down

Anush

07:12

Really?

PyGamer0

07:35

yes

Anush

07:50

I am confused :)

I don’t understand the close votes for codegolf.stackexchange.com/questions/236734/…

why would two people vote for that?.

lyxal

@Anush they are voted to close the question as a duplicate of another

They are saying it's similar to codegolf.stackexchange.com/questions/236563/…

Anush

Right but it clearly isn’t a dupe. How can I explain this more clearly?

Bubbler

Well the comments already acknowledged that, so there's no need to explain further

Anush

Apart from anything else, the rule for whether something is a dupe is if an answer to one would be a competitive answer for the other

answers to the linked question aren’t answers at all to the new question!

Bubbler

Just that you'll see that two votes lying around forever

emanresu A

08:00

@Bubbler Check again :p

Bubbler

what

emanresu A

I retracted my close vote, but IMO, "find all x" vs "find the best x by a certain criteria" aren't that differrent

Anush

@emanresuA thanks! The new question isn’t “find all x” really in the sense of outputting all possible solutions

There is no way to use brute force to solve the new question

whereas you can for the linked question

emanresu A

... There's a way to brute force almost anything, including this

Simply iterate over all combinations of 12 integers within the range, check if valid for each

Anush

@emanresuA how ? You would need to be able to check a proposed solution

how would you do that?

emanresu A

08:05

Oh wait, I reread the question and now it makes more sense. Mind if I edit it a bit?

Anush

Sure. What edits will you make?

emanresu A

Just clarifying it a bit, you can rollback if you don't like it

Bubbler

@emanresuA Just think of this: finding finitely many solutions in finite time vs. finding infinitely many solutions in finite time

Anush

k

in the meantime, we need to have a challenge for mathematica.stackexchange.com/a/66564/6933

@Bubbler very nice description

Bubbler

Also you need some number-theoretic knowledge to even have some solution. You don't need any in the previous one

Anush

08:13

Yes. Or the ability to Google :)

emanresu A

@Anush Nevermind, I don't understand it now :p

Anush

@emanresuA can I help?

which part is confusing?

emanresu A

I don't understand whether for multiplying the tuples it's (n0,n1,n2), (n0,n1,a), (a,b,n2) or something else.

Anush

It is n0*tuple1 + n1*tuple2 + n2*tuple3 = a,b,c,d

emanresu A

So then why do some of your examples use a and b?

Anush

08:26

Do you mean in the “Answer” parts?

emanresu A

Yes

Anush

I might rename that to Math. The Answer is not what your code should output

it is just a mathematical answer

which we then translate to the output format

Newly Featured Posts

20

Q: Write some Genetic Quines

In this challenge, you'll create some programs which behave similarly to genes. When you run one, it will return one of its two "alleles" (a half of its source code), and concatenating any two alleles from your programs will result in a new, functioning program (which returns its own alleles). As...

code-challenge quine source-layout

Anush

@emanresuA does that make more sense?

emanresu A

Yes

Anush

08:30

Cool!

I edited the question . Do you think I should add more clarification?

Anush

08:45

@emanresuA unless you are solving it now?

emanresu A

Nope :p

Anush

@emanresuA bother :)

Jo King

@lyxal Error code 418

emanresu A

But... Jelly isn't a type of tea

You could put Jelly in tea

Anush

09:02

Do you think it makes any difference how big a bounty is?

If I put a bounty of 500 would I get more/better answers than a bounty of 50?

Input:

a,b,c
a,d,f
d,u,v
f,g,h
d,u,g
x,t,k

Output:

f,g,h
x,t,k

Selection criteria:

If anything occurs in column one multiple times, then all of the associated rows will be deleted.

CMC solve the problem above

(for general inputs of this form)

pxeger

@Anush where is the problem from?

Anush

09:51

I am not sure. It was sent to me a while ago

@pxeger ^^^

But it's just a normal coding question turned into a golfing problem

lyxal

@Anush Vyxal, 20 bytes: vf:ÞTƛĊ'tċ;vh;f£'¥∩¬

It's horribly cursed, but it actually works

The a flag is only for convenience of input

The answer would still work if you gave it a list of strings

Anush

The output is horrible :)

lyxal

It's just a list of lists of characters

Because lists are delimited by the angular brackets on the strings are delimited by backticks

Anush

Yes I understood

lyxal

[['f', 'g', 'h'], ['x', 't', 'k']] if you like square brackets

Anush

10:05

CMQ Is there any advantage in giving a bigger bounty if your hard question has no answers?

@lyxal f,g,h would be better

lyxal

@Anush vf:ÞTƛĊ'tċ;vh;f£'¥∩¬;⁋ if you want nicer output

Anush

TIO?

lyxal

Same link as before with the above program

vf:ÞTƛĊ'tċ;vh;f£'¥∩¬;ƛ‛, j;⁋ if you want commas

Anush

Looks good. The input is in the wrong format though :)

lyxal

It's a CMC and I'm on mobile. Input and output formats don't particularly matter :p

But if you really insist on strict IO,

Try it Online!

Anush

10:11

Nice!

lyxal

⌐vf:ÞTƛĊ'tċ;vh;f£'¥∩¬;ƛ\,j;⁋

Thank goodness there's a built-in for splitting on commas

Anush

I am amazed you are doing this on a mobile!

lyxal

@Anush I've done more impressive things than this on mobile :P

2

A: Print X without X (robber's thread)

><>, -v 1, cracks HighlyRadioactive's sixth answer :::-n:n::+n:::++n::::+++n:::::++++n::::::+++++n:::::::++++++n::::::::+++++++n:::::::::++++++++n:+:+:+:+:::::++++++:::,+:::,+:::,+:::,+:::,+::,:+:+:+:+:+::,+::,+::,+::,+::,+::,:::::::::+++++++++:*::,:::::::++++++++:::,::+++:::,:::::+++++-::,:+:+:+...

Anush

@lyxal :)

emanresu A

@lyxal Do you think the interpreter frontend on mobile is as good as on desktop?

Anush

10:14

Do you use an app for this greatness?

lyxal

@Anush I also made a scratch answer (drag and drop) on my phone once

@emanresuA yes

@Anush I just use my Web browser

Anush

Very impressive

lyxal

@emanresuA screenshot coming shortly

Anush

Next betting question, will there be an answer to my challenge before I can put a bounty on it?

lyxal

user image

@Anush depends if people want to do it. Logically, one would expect that a bigger bounty would indeed attract answers

Anush

10:18

@lyxal I should do an experiment

lyxal

@emanresuA do you see how it's actually somehow responsive in design?

emanresu A

@lyxal Hm, it resizes really nicely, even the codemirror textareas. That's honestly surprising :p

@lyxal Yes

PyGamer0

10:40

now internet == fixed

Anush

Phew!

2 hours later…

pxeger

12:32

a lisp that fits in a floopy disk boot sector (512 bytes compiled)

lyxal

12:50

CMQ: Golfy and useful string-string functions

that is, a function/operator that takes two strings

return type is up to you

user

hoogle search

Most look not too useful, unfortunately

A regex-related thing that Vyxal doesn't have already, maybe?

lyxal

what though?

we already have most of the useful stuff from re

user

Hmm, maybe just apply some array-array function to strings then?

PyGamer0

in Dinoux Room, 2 hours ago, by PyGamer0

i want to make a infix lang

lyxal

@user is [Any] -> [Any] -> [Any] how you search for array stuff?

user

13:00

> Yo dawg, I heard you like LISP so I put a LISP in your LISP so you can eval while you eval

@lyxal I don't think Any exists in Haskell, but [a] -> [a] -> [a] might work

pxeger

@lyxal joining shortcuts? like join two strings on space, comma, newline, etc.?

lyxal

@pxeger hey now that's a good idea

dang that's genius

pxeger

lol thanks

there are quite a few hoogle results for join on space, which is what inspired me

user

I'm actually kinda surprised joining on spaces/newlines isn't a common builtin for golflangs

lyxal

well that's me done for the nightr

o/

user

13:13

@lyxal I think you accidentally starred pxeger's message

lyxal

@user fully intentional

pxeger

@user what? my message fully deserved to be starred!!

I am indeed, a genius

and the most humble one in the world, at that

user

@lyxal Ah

lyxal

@pxeger correct

user

@pxeger No, I am!

lyxal

13:14

Anyhow I'm going to go sleep for real now

O/

pxeger

bye lol

user

 ○/
/|
/ \

user

13:29

Is it just me, or is CR populated by older people than CGCC?

Would be interesting to see demographics of sites other than SO

pxeger

13:43

wait I forgot about uppercase letters

New Posts

0

Q: Collatz problem one-liner

I heart that all programs in Python can be written with list comprehensions. Create collatz sequence with one list comprehension. Assume that the initial number is already known. x = 17 collatz = # YOUR LIST COMPREHENSION HERE print(collatz)

user

@pxeger ??? Is this about joining on characters?

pxeger

@user no, it was about my deleted message (which was a CMQ about choosing the most appropriate short letters for command line flags)

doesn't matter

user

Oh ok

1 hour later…

Redwolf Programmed

15:10

Yay, chat's back

Was it offline for maintainence for anyone else?

pxeger

15:24

yes

the main se site is still down though

while I'm here, I have a collection of bugs relating to the maintenance

search on StackOverflow (only) was broken:

user image

pxeger

maintenance started an hour later than they said it was going to

(timezone confusion?)

pxeger

Area 51 didn't have a maintenance banner

pxeger

Chat was down (but we already knew that)

(these things should probably be in present tense, actually)

Neil

@Mayube Charcoal, 4 bytes: ⟦θηθ or with list input: Ａ‖Ｏ↓

user

15:42

@pxeger Why the ---'s?

pxeger

@user to separate the bugs

user

But they're in separate messages anyway?

pxeger

some of them were multiple messages

user

Ah

caird coinheringaahing

16:41

@pxeger that's not really a bug, they often start maintenance at (roughly) different times to those stated

Sandbox Posts

17:13

0

A: Sandbox for Proposed Challenges

Fast Matrix Multiplicator Evaluator code-challange A triplet of real tensors (A,B,C) of size $\gamma \times \gamma \times sigma$ represents a matrix multiplication algorithm with $\sigma$ elementary multiplications iff the following function evaluates to zero: $$ \text{error}(A,B,C) \equiv \sum_{...

DLosc

17:31

@Anush Pip -rl, 11 bytes: @_N@Zg=1FIg

Anush

17:48

@DLosc that's great. How does it work?

Anush

18:18

evening all (and all other times of the day)

Redwolf Programmed

Afternoon!

Anush

hello!

up to a massive 5 upvotes :) Current betting: an answer in the next 14 hours?

DLosc

18:39

          g  List of lines from stdin (due to -r flag)
        FI   Filter on this function:
@             First character of
 _            Each line
  N           Number of occurrences in
   @           First sublist of
    Z          Zipped
     g         List of input lines
      =       Equals
       1      One
             Output result one element per line (-l flag)

@Anush ^

Anush

19:07

Cool!

emanresu A

19:43

For once I'm asleep while the maintenance is happening :p

Anush

:)

DLosc

19:59

Any more thoughts on this question?

21 hours ago, by DLosc

CMP: Should Nominations for Language of the Month be community wiki? Pros/cons? Does it matter?

Anush

Community wiki seems a good idea

What is the argument against?

Wezl programs redwolf

@RedwolfProgrammed I'd confirm that I'm under 18 if you paid me sufficiently :P

come to think of it, I'd also confimr that I'm over 18 if you paid me sufficiently and bugged me every year, but I'll warn you that it might take up to 18 years

Anush

20:23

Me too:)

Redwolf Programmed

I'm going to try to compress a 2m video into 6mb

Wish me luck

user

Wezl, what have you programmed Redwolf to do?!

Redwolf Programmed

20:56

I did it!

It's still watchable, even

120p and 16 FPS, but you can tell what's going on easily enough

Time to try 60p. Not 60 as in 60 fps, 60 as in 60 pixels tall.

Okay I'm down to 60p and 10 fps now, it's watchable in the sense that you can see what's occurring, but in enough detail to be able to read text, make out faces at a moderate distance, etc. It's only 2.6 mb for a 2m video, though.

I wonder if dropping the audio bitrate would save some precious bytes

DLosc

@RedwolfProgrammed Related

Redwolf Programmed

I'm down to 1.2 mb now

32k audio and stripped metadata

I'm going to try a second 2m video now, with me talking and showing some text to the camera. My test video doesn't have much audio I can judge the quality from.

Oh nice my sister was playing with a bottle of superglue on my desk and now it's glued (probably permanently) to a book

DLosc

21:12

I wonder if it would make the file smaller or bigger if you didn't have audio and used intertitles instead. In theory, I think it would be less information even if it makes the clip longer, but the movie format might not be optimized to take advantage of that.

hyper-neutrino

redwolf at this rate you might as well just make a powerpoint presentation

user

@RedwolfProgrammed Solution: superglue sister to something else

Problem solved :P

Redwolf Programmed

Interesting, this second video's a lot larger (190 MB vs. 140 MB), but it compresses way better (instead of 10 MB, the 240p one is 8 MB)

Trying 60p now

Okay, as I'd said before, text is almost unreadable, unless it's very large or you get the angle exactly right

Time to test audio, with the 32k bitrate

1.074 MB

Speech is audible

But you need to talk loudly, which I did not do

Okay, I'll try a compromise. 120p, since 60p is basically unusable for most things, 8 fps, 32k audio

I wonder if 90p would work...

Okay, I think I'm done experimenting. I've got 2.2 MB for a 12 fps, 120p video, which seems like it's close to the bare minimum. Cutting the frame rate down a bit and using a slightly more nonstandard resolution would probably let you upgrade the bit rate a little, and fit something like 6m of video into that 6mb.

But, if you use the minimum you could reasonably watch (60p, 8-10 fps, 32k or around that much for audio), you can use basic steganography to fit 10m of video into a 4k wallpaper.

And that makes me very happy

hyper-neutrino

21:35

can't you get the audio much lower than 32k while still being understandable?

or would it not really save much space

Redwolf Programmed

Idk, probably. I don't know too much about audio. (or video for that matter)

32k seemed like the minimum anyone would realistically use though, from what I read while googling, and I was trying not to use anything so ridiculously low (like 1 fps or 20×40 resolution) that it wasn't practical for any purpose

I'd try it but I already shut my laptop down lol

I just find it crazy that you can actually fit any usable video into a single image

And with steganography too, so you only get a small fraction of the bits for the video

user

21:51

CMC: Speaking of steganography, anyone feel like decoding this? (hint: unzip)

Redwolf Programmed

I've tried unzip and gunzip, guess it's something more complex than just changing the file extension and opening it

user

unzip should've worked

I probably messed up, gimme a minute

unzip banana.jpg worked on a computer that had Kali (an old version, though)

user image

@RedwolfProgrammed Could you move my first image to trash? The second one should work

Redwolf Programmed

→ 1 bunch of bananas moved to Trash

Still not working for me

user

22:07

:(

The unzip command should do it if you have it installed

Anyway, dw about it, it's just a dumb joke (made by someone else in my class)

hyper-neutrino

@RedwolfProgrammed 8000 Hz is totally usable although of course the frequencies sound really compressed but you can tell what it's saying

sounds almost like listening to it through an old radio :P or at least what I think that's supposed to sound like from movies

Redwolf Programmed

lol, I was totally unprepared for that rickroll

hyper-neutrino

which, if I'm not mistaken, is just due to old radios (specifically AM) compressing frequencies right?

@RedwolfProgrammed gottem :P

Redwolf Programmed

Now I'm curious...time to go see if I can get below 1 MB

user

@RedwolfProgrammed So it did work, nice

Redwolf Programmed

22:18

731 kb

For a 2m video

user

Is this for some stupid Flipgrid restriction?

Redwolf Programmed

I don't think ffmpeg knows how to properly handle 8k audio though, it just sounds like muffled warbling

Oh, it's hz vs. kbps

We're using different units

It's not 8 khz...it's 8 kbps, which is 1200 hz

8000 hz would be 53.3kbps

Unrelated String

22:40

@RedwolfProgrammed probably an issue with the choice encoder; ffmpeg shouldn't fuck anything up on its own

oh

yeah that makes sense too

but yeah intelligently compressing things with ffmpeg is hard

lyxal

@user potassium.

user

@lyxal goo.gl/zPOD

hyper-neutrino

@RedwolfProgrammed oh well that's awkward

oh you said 32k bitrate lol. oops

Redwolf Programmed

23:23

I got a laser printer for my brithday a few years back, and shortly after my parents' inkjet printer stopped working, so now I have a monopoly on printing in my house. Considering charging people for it.

75¢ a page seems reasonable

lyxal

@RedwolfProgrammed for a moment then I thought you were saying that you were printing monopoly money

And I was thinking "why are you using a broken printer to print monopoly money"

But then I reread the message

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Oct '2130

The Nineteenth Byte

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