The Nineteenth Byte

OldSandboxPosts

01:00

Sandbox posts last active a week ago: Assembly capture-the-flag KotH, Pennies to Dollars, Compressed UTF-8, Optimal Duck Game Moves

lyxal

03:03

So-I suddenly-decided fun and silliness should come prepacked-in porridge-drenched umbrella-packets until-Monday.
Laughably, nobody bothered noticing consequences indirectly arising since applying my decision rapidly and subtly.
"But-lyxal"-said Robert-Steinfield-Lipton, "Let's-think logically...-everyone gets-trobules getting-entirely evaluated"
Naturally-,egotistical Bert-always berates-xal by-orating lyxal's-anti letters-(order turned-cause aiming at-solving a-discussion).
(Also-perhaps adding-dashes and-random accents-becomes-lazy-sauce after-reading-such a-big-amble ain't-basically-exa…

4

with hyphens added to make it clear that it's a multi-word operator

like suffix increment

or "Assignment by bitwise AND"

New Posts

05:06

0

Q: Iterate over all non-equivalent strings

Input A single positive integer \$ 10 \geq n \geq 2\$ Output A list of strings, each of length \$2n\$, satisfying the following properties. Each string will contain each of the first \$n\$ lowercase letters of the alphabet exactly twice. No letter can occur twice consecutively. That is abbcac is...

code-golf

Simd

why does it say "viewed 1 time" instantly? Is that counting me as the person posting the challenge?

l4m2

05:50

@NewPosts 26 bytes and found it's deleted

js

New Posts

0

Q: Commenting Out the Comment

I'm back! Lately I've been working on something, but finally I've finished it and can return to CGCC! I'll be continuing the Fast & Golfiest Series soon, and also try to start working on (given I have the time and energy) WumpusWars. For now, a new question as a gift for everyone! The original ...

code-golf

lyxal

06:10

→ 1 sussy aomng us moved to The Nineteenth Bakery

Simd

07:59

Good morning

Jo King

@mousetail i never really understood these. why is multiplication higher precedence than division/addition higher than subtraction? wouldn't that mean something like 2/3*4 = 2/12 rather than 8/3?

mousetail

It really should be PE(md)(as)

Jo King

just seems like a bad learning tool if it teachs you something wrong if you take it at face value

mousetail

100%, it causes a ton of confusion

Adám

Bad mnemonics for bad rules. Makes sense.

mousetail

08:09

Lyxal's solution with hyphens is smart though

Jo King

it'd be like if a solar system mnemonic had an extra planet for some reason

Simd

@JoKing don't diss Pluto!

Adám

I think Pluto should be allowed to self-determine (dwarf-)planetary status.

Simd

@Adám I self identify as a planet

I think that works

mousetail

Pluto is not a planet because quite a few astroids are bigger

Unrelated String

08:19

speaking of hyphens i just wrote my first retina answer in four years and i think that's enough thinking for today

whew

Simd

@mousetail that's so prejudiced

Adám

@mousetail afaik, size is actually not directly relevant.

Simd

Can you name them? Have they ever featured in a Disney film?

mousetail

It's about being the only object in the orbit

Simd

@Adám I think it's part of it. They are supposed to be big enough to clear the area near them

mousetail

08:21

If you want to add Pluto as a planet you need to add Ceres and Makemake too

Adám

@mousetail Nope, not that either. (Jupiter isn't alone in its orbit.)

mousetail

@Adám It has troyans but they sort of orbit Jupiter

Adám

@Simd "big enough", but that's relative, not absolute.

@mousetail How so? I think they stay at mostly fixed points relative to Jupiter and the sun.

Simd

(1) A "planet" [1] is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.

Adám

"around", but not "at"?

mousetail

08:23

Jupiter trojan

The Jupiter trojans, commonly called trojan asteroids or simply trojans, are a large group of asteroids that share the planet Jupiter's orbit around the Sun. Relative to Jupiter, each trojan librates around one of Jupiter's stable Lagrange points: either L4, existing 60° ahead of the planet in its orbit, or L5, 60° behind. Jupiter trojans are distributed in two elongated, curved regions around these Lagrangian points with an average semi-major axis of about 5.2 AU.The first Jupiter trojan discovered, 588 Achilles, was spotted in 1906 by German astronomer Max Wolf. More than 9,800 Jupiter trojans...

Simd

(2) A "dwarf planet" is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape [2], (c) has not cleared the neighbourhood around its orbit, and

(d) is not a satellite.

Adám

@mousetail Exactly, they are not in orbit around Jupiter at all.

Simd

I can't remember which Pluto fails

mousetail

Ok so yes, but their orbital trajectory is still mostly dependent on Jupiter, and the Lagrange points between Jupiter and the Sun

Adám

Ganymede and Titan are only moons, though they are bigger (in diameter, not mass) than Mercury (which is definitely a planet according to all):

mousetail

08:27

Unlike dwarf planets that are not really big enough to destabalize orbits outside the Lagrange points

Simd

It's only Eris competing with Pluto for planetary status isn't it?

Can someone remind me why Pluto/Eris don't count as planets?

There is also Ceres

It doesn't clear the neighborhood around its orbit apparently

A rule made up just to exclude it :)

Adám

Yeah, this is all arbitrary. Humans love putting things into boxes, but the world just isn't like that.

Simd

Can anyone explain how this answer was posted instantly after the question? codegolf.stackexchange.com/a/264104/116117

I mean, it's hardly trivial

Jo King

08:51

was it in Sandbox, sometimes people might write an answer early

Simd

@JoKing it wasn't

lyxal

09:07

@Simd some people are just fast

I mean, look at advent of code for example. People getting the top ranks have insane speed

Simd

09:50

@lyxal that is true!

emanresu A

10:17

Or AI bots in some cases

lyxal

@emanresuA Good luck getting genai to properly solve an aoc challenge that isn't the first few days

Unrelated String

that was how it played out :P

lyxal

Almost as if that's why I had to specify the first few days :p

emanresu A

10:42

Unless eric adds some sort of protection it's only going to get worse

Unrelated String

it probably won't be much worse this year at least

and he's probably going to try some of the models the botters used on the questions while he's drafting them to see what trips them up

emanresu A

This year I bet no human solver is going to get in the top 100 on days 1-5

Simd

11:55

The bots can't sensibly solve any of our challenges yet can they?

@emanresuA are you referring to code challenges on this site?

Unrelated String

aoc

Simd

I don't know what that is :(

Alexandria Ocasio-Cortez ? :)

Advent of code!

Why are those questions easier for bots than ours?

Unrelated String

the early ones tend to be relatively straightforward, and the format is fairly consistent

but more than that, there's just more people actually trying to make bots that work on it :P

also a bot could produce a faulty program that still produces a correct answer for its given input

lyxal

CMQ: Is it possible to get all the ways to partition an infinite list? All the algorithms I'm finding require knowing the length of the target list, which isn't possible with an infinite list.

Simd

@UnrelatedString that is true.

@lyxal can you give an example?

lyxal

12:05

[1, 2, 3, 4] => [[[1], [2], [3], [4]], [[1, 2], [3], [4]], [[1], [2], [3, 4]], [[1], [2, 3], [4]], [[1, 2, 3], [4]], [[1], [2, 3, 4]], [[1, 2], [3, 4]], [[1, 2, 3, 4]]]

Unrelated String

could you not partition the prefixes

Dannyu NDos

@lyxal That's impossible because there are uncountably many partitions.

Unrelated String

like you partition up to a certain index and leave an infinite tail unpartitioned, and just gradually grow the prefix you partition

ooooh

figures

lyxal

yeah I figured it was impossible, just wasn't sure if there was some way to do it like how you can cartesian product two inf lists

makes life a whole lot easier :p

Unrelated String

:p

Dannyu NDos

12:07

That said... What about this?:

0

Q: Proof that infinite lists cannot be shuffled uniformly

A list with countably infinitely many entries have $\beth_1$ permutations. As such, I thought uniform probability distribution over permutations of an infinite list exists, but eventually, I found that the answer is negative. Here goes the proof attempt. A uniform probability distribution over th...

general-topology probability-distributions solution-verification permutations quotient-spaces

Simd

CMQ is it possible to visit every string in this just by swapping adjacent characters? acbcba cabcba bcacba cbacba cbcaba

The Empty String Photographer

@lyxal it’s just going to look like the infinite list itself :p

If indeed it is infinite.

Simd

12:29

in *this list

Simd

13:54

Is my CMQ uninteresting or unclear?

Unrelated String

well

> acbcba
  \/
  /\
> cabcba
   \/
   /\
  cbacba
  \/
  /\
> bcacba
  \/
  /\
> cbacba
    \/
    /\
> cbcaba

so the answer would appear to be yes :P

and i think in general any permutation can be a sequence of adjacent swaps

because at the very least you can mechanistically kinda, bubble sort

unless you mean without an intermediate string outside the 5?

Simd

@UnrelatedString I did mean without an intermediate string outside the 5

Unrelated String

mmm

Simd

But it looks like you solved it for these strings, right?

Unrelated String

well, if you look at it as just seeing if any of the three latter ones can reach either of the two former ones

it would appear to be false

@Simd i just mechanically did it in the order given so a priori it doesn't rule out some other connection being possible

Simd

14:04

@UnrelatedString oh I see, you have gone back to cbacba twice

@UnrelatedString right! That's my question :)

Unrelated String

oh wait how the fuck did i not notice that that's already in there lmao

well i guess that's a yes

Simd

You did go to the same string twice

Maybe that shouldn't be allowed

@UnrelatedString do you think it's possible if you can't revisit a string?

Unrelated String

no

Simd

@UnrelatedString how come?

Unrelated String

14:19

there doesn't appear to be any other way to bridge the groups

Simd

Ah ok. I guess you could make a graph with the strings at nodes and two nodes connected if you can get from one string to another by a swap

Then we are looking for a Hamiltonian path

For this size problem that should be solvable

Unrelated String

also you can simplify any automatic existence of an edge checking in this case by cutting off the ba at the end of all of them :P

Simd

@UnrelatedString true!

Simd

15:02

There must be a shorter python solution to my challenge!

It surely can't be almost 3 times longer than JS can it?

Sandbox Posts

15:16

0

A: Sandbox for Proposed Challenges

Count N-Rich Permutations of an Integer Sequence Given a sequence of integers with length \$L\$ and an integer \$1 \le N \le L\$, an "\$N\$-rich" permutation is one whose the longest strictly increasing subsequence has length exactly \$N\$. For example, let our sequence be [0, 1, 2, 3]. There is ...

EphraimRuttenberg

just posted a sandbox ^. would love if people could check it out

New Posts

16:54

0

Q: Spam SPam Spam Spam

import cv2 import numpy as np # Load the image image = cv2.imread('input_image.jpg') # Get the dimensions of the image height, width = image.shape[:2] # Calculate the height to keep (30% of the total height) crop_height = int(0.3 * height) # Create a mask for the bottom 30% section mask = np....

random

Unrelated String

haven't we already told them not to do this again

Rydwolf Programs

17:27

waaaait a minute

1

A: Write a microwave timer!

Python Program (97 Bytes) Code for the Microwave Timer Project f=lambda i:f"Lower"if (int(i[0:2])*60)+int(int(i[3:5]))>6000else(int(i[0:2])*60)+int(int(i[3:5])) Example Input: 76:92 # String input Example Output: 4652 # Number of seconds Note: You do have to call the function and print it sepa...

I think this is AI-generated

int(int(i[3:5]))

mousetail

The username "PronetAI" certainly seems suspicious

Rydwolf Programs

FWIW it's invalid anyway

"should be able to handle more than 100 seconds in the input slot" and it does not

mousetail

It also explicitly says full program but is a lambda function

Peilonrayz

@cairdcoinheringaahing (and non-moderators ofc) I want to test something about MathJax on your meta site. I don't really want to litter up the place, do you have a MathJax sandbox I could abuse. I'd search but I just get the question sandbox.

caird coinheringaahin g

Not really, but this would be fine

Peilonrayz

17:42

Ah, tyvm

The answer's source perfectly answers my question \$ works on meta. Thanks, I didn't even need to answer/edit anything :)

Simd

I love progress bars in python but I thought it be fun to have one that shows a rotating bar. That is - \ | / - \ | etc but all shown in the same place. Is there a golfy way to show these in the same place in python?

Unrelated String

> Python Program (97 Bytes) Code for the Microwave Timer Project

yeah literally no human being would write that, funnily enough

it's a bizarre synthesis of code golf and third rate cs education materials :P

mousetail

There's a lot of unnececairy parenthesis, even with basic arithmetic

Rydwolf Programs

Eh, I could see a non-native speaker who's read a lot of third-rate cs education materials writing it

Don't think it's AI beyond a reasonable doubt tho it likely is

mousetail

Also where did they get the idea to output the string "lower" for too high inputs

If they are AI they'll post more

no need to perform an action based on a single post

Simd

17:51

Probably too trivial for a challenge

CMC display a bar rotating in place (in ASCII)

Rydwolf Programs

Needs a whole lot more detail

Simd

@RydwolfPrograms go on?

Adám

@Simd like /-\|?

Rydwolf Programs

Like...what are you even asking for

Simd

@Adám yes exactly

mousetail

17:53

import time;i=0;while True:print(end="\r"+"-/|\"[i:=(i+1)%4]);time.sleep(1)

Unrelated String

one of those spinny things you get on progress indicators on cli stuff sometimes

Rydwolf Programs

3d? 2d? ASCII? rotating around what axis?

ah

i=0;setInterval(_=>document.body.innerHTML="/-\\|"[i++%4],0)

Adám

@mousetail Does that not print a new line for each position?

mousetail

True

Fixed

Simd

@RydwolfPrograms just in place at one spot.

mousetail

17:54

@RydwolfPrograms Use document.body.innerText= instead of document.write

Simd

@RydwolfPrograms I love progress bars in python but I thought it be fun to have one that shows a rotating bar. That is - \ | / - \ | etc but all shown in the same place. Is there a golfy way to show these in the same place in python

mousetail

My answer should work

Simd

@RydwolfPrograms is that writing to the terminal?

Rydwolf Programs

@mousetail Yeah just realized that

mousetail

Rydwolf's answer writes to a webpage

Adám

17:55

@Simd Any particular spin speed?

Simd

@Adám just slow enough you can see it

@mousetail this looks great

And a good use for a walrus!

mousetail

Sometimes, when using the walrus operator, I wish I was a walrus

Such cool animals

Adám

@Simd Can we use ─ instead of -?

Simd

@Adám of course

@mousetail :)

I know I should know, but what exactly does \r do? I thought it was carriage return

But it is used to write in place

Adám

@Simd {⍞←(⊃⍵),⎕UCS⌊⎕DL 8⋄∇1⌽⍵}'\|/─' does the trick in APL.

waits 8 seconds between each glyph.

Simd

18:03

"When you print with end="\r", it moves the cursor back to the beginning of the line without moving to the next line." Thank you ai bot

@Adám can I see it online?

Adám

@Simd That's what it did in the old days. These days, it usually also moves to the next line.

mousetail

\r still mostly works like in the old days

\n though usually moves to the next line and the beginning, it used to move down only

At least in a terminal context

Adám

Hence \r\n to go down and left.

mousetail

Yep

Simd

@mousetail I never used it in the old days :)

Adám

18:05

@Simd I'm afraid there aren't any online environments that both provide real-time output updates and adhere to control characters.

mousetail

I mostly like Linux style things but I think \r\n is objectively the most correct line break

Simd

@Adám shame

Adám

I can make a gif (and speed it up).

Simd

Cool!

Adám

It will spin forever.

Simd

18:15

@Adám I like it!

Adám

−1 byte: {⍞←⍵,⍥⊃⎕UCS⌊⎕DL 8⋄∇1⌽⍵}'\|/─'

Ooh, much shorter and faster: {∇⍵⌽⍨≢⎕DL≡⍞←⊃¨⍵⎕TC}'\|/─'

Rydwolf Programs

18:33

@Adám RTO will!

Adám

Appears not:

Rydwolf Programs

?

Adám

> and adhere to control characters.

Rydwolf Programs

That's not RTO

Adám

Oh, sorry, there are so many of them these days.

Rydwolf Programs

18:36

@mousetail My reasoning for liking \n is that if it doesn't behave like Windows CRLF, \n is kinda redundant with \v

Adám

Rydwolf Programs

Ooh \r\v would be such a janky newline scheme if anyone's making an OS

mousetail

Eh there are a ton of redundant control characters already

Rydwolf Programs

@Adám That's just a prototype of the back-end with a debug front-end

mousetail

The extra byte doesn't really matter

Rydwolf Programs

18:37

Note the "will" :p

Adám

Oh, that was a future "will". Looking forward then.

Rydwolf Programs

Oh yeah I just realized the ambiguity with that "will"

Adám

Btw, my main issue with ATO vs TIO is that it requires user action to run. Will RTO auto-run?

mousetail

@RydwolfPrograms Make sure include an option to turn escape code interpretation off, sometimes you need the raw output bytes

Rydwolf Programs

Dw, customizability of I/O is gonna be a huge deal with RTO

mousetail

18:38

That's great

Adám

Off topic, what happened to the tank game?

mousetail

I'd also like hex output in addition to base64, so I can more easily manually tell what the byte values are

Rydwolf Programs

First the layout of the page will be per-language customizable (so, e.g., you can remove compiler flags from brainfuck, and instead add toggles for things like cell size), and second all of the input/output boxes will have tons of options in a dropdown

Yup, hexdump will be one of the supported output formats, along with plain text, JSON-style escaped string, and terminal

The terminal one will even support interactive input

mousetail

Big if true

Rydwolf Programs

@Adám Stopped starting the server up after reboots since it was dead

Adám

18:40

ah

Rydwolf Programs

I'm also planning something

mousetail

Oh one more feature request: Ability to run the same code on a whole list of test cases, to be more easily able to test full programs without needing a seperate link for each

Rydwolf Programs

Ooh that's a good one

mousetail

And not like regex101 where it takes 4 mouse clicks to add a test case so it's too much of a pain to use

Adám

@RydwolfPrograms Something I'd love to have is the ability to NOT have a line break between Header and Code.

Rydwolf Programs

18:43

The way headers and footers are going to work is super cool

Instead of header-code-footer, it's just one box, which you can subdivide arbitrarily. You can customize the separators and which ones are byte-counted, and even use different encodings (so that you can, e.g., intermix binary hexdumps with readable text). By default it'll be laid out in a header-code-footer system, but it's flexible enough you can use it for all sorts of stuff

Adám

Wow.

Neil

19:20

1

A: Loading... Forever

Python 3, 86 83 bytes GIF to follow. Golfing suggestions welcome as this is still a little verbose. -3 bytes thanks to Flp.Tkc. import time i=1 while i:print(end="\rLoading... "+"/-\|"[i%4]);time.sleep(.25);i+=1

(also the question itself is roughly equivalent to your CMC)

Simd

19:37

@Neil cool

emanresu A

19:49

@Neil Now might be a good time to reply to codegolf.stackexchange.com/questions/144116/…?

Simd

20:51

How hard is it to draw a line at 15 degrees (instead of / say) in python?

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