The Nineteenth Byte

@GingerIndustries Your interpreter also needs to have a way to interpret a file composed of raw bytes as APOL code. That way, when you claim a score of 13 bytes, you can (if asked) provide an actual 13-byte file that runs the correct program.

Redwolf Programs

@GingerIndustries Everything from (0x20) to ~ (0x7e) yeah

tjjfvi

6:40 PM

@RedwolfPrograms That almost looks like a job for puzzling.se

grandBagel

Fmbalbuena

@DLosc what happens if the last bit is 1?

@grandBagel WH47 D0 Y0U M34N?

DLosc

@Fmbalbuena Why is that any different from if the last bit is 0?

Fmbalbuena

UTF-8

Redwolf Programs

An SBCS is a replacement for UTF-8

Fmbalbuena

6:43 PM

@RedwolfPrograms i know but if the encoder from SBCS to UTF-8, and the last bit is 1, what happens?

Redwolf Programs

You don't just copy the binary into UTF-8 code points, you map it to the relevant Unicode character

So if 10110011 mapped to ¬, it would get mapped to the UTF-8 sequence for the character ¬

(11000010 10101100)

Not being able to use special characters in google searches is so annoying

grandBagel

@RedwolfPrograms so true

Any feedback for this?

tjjfvi

@RedwolfPrograms How long have you been working on this answer?

And, is the image metadata relevant? I thought the challenge banned that but it seems like it does not

Redwolf Programs

@tjjfvi Took me about half a day at most

I had some useful tools already developed, like steganosaurus, and some programs I'd written to test it

No relevant metadata

It's all contained in the images themselves

tjjfvi

Hmm

Nov 14 at 3:41, by Redwolf Programs

Redwolf Programs

6:57 PM

I used that image as the container, it doesn't contain any encoded information

tjjfvi

^ afaict this has the exact same pixel data as the image in your answer, save some cropping

Redwolf Programs

Uh oh

it does

Is imgur dropping some low bits or something?

Wait nvm

It's all there

tjjfvi

Did you upload the wrong image?

Redwolf Programs

Nope, I just had a filter set in steganosaurus and forgot about it

The message is there

(Downloaded it again, in incognito, directly from CGCC and it shows the correct message when fed to my decoder script)

tjjfvi

Hmm ok

Is the original image required for decoding?

Redwolf Programs

7:02 PM

No

But I suppose you could compare the two to find any slight differences, which could be a little bit helpful

But as far as I'm aware, the other two originals aren't publically available

tjjfvi

Aug 17 at 19:07, by Browncat Programs

Redwolf Programs

Oh huh

Well, the snow one shouldn't be here

tjjfvi

Yeah I don't see that one

emanresu A

@tjjfvi Aw...

Redwolf Programs

That's Scully I think

tjjfvi

7:11 PM

@RedwolfPrograms Can you confirm that the md5 sum of the downloaded png is 46c897e0588c289f52864a55f5d86871?

Redwolf Programs

Yep, 46c897e0588c289f52864a55f5d86871

tjjfvi

Thanks

(though I suppose for security I should've made you send me the hash first :P)

Redwolf Programs

lol

And, for future reference, 4bf4130af67681416775706b9399002b is the sum for the cat, and 7766488bbc2f3a849aff5d97d555791c for the snow

caird coinheringaahing

@Fmbalbuena My Santa hat isn't a real hat, it's from Winter Bash 2019 and I took a screenshot and kept it

hyper-neutrino

@cairdcoinheringaahing i can't believe you would deceive us like this

caird coinheringaahing

7:16 PM

My other profile picture also has a hat from Winter Bash 2019 :P

Fmbalbuena

@cairdcoinheringaahing i know

Ginger Industries

my santa hat literally never existed

emanresu A

@RedwolfPrograms For future reference, I could make their hashes collide for a few dollars.

(As in server costs)

(md5 bad)

Redwolf Programs

Yeah, but md5's what was requested

SHA-512 for the win otherwise

emanresu A

Yeah

tjjfvi

7:19 PM

I'll also take SHA-512

MD5 just seemed to be the most likely to be easy for both parties

emanresu A

3

Redwolf Programs

Yeah, the point of this wasn't security, it's just to make sure no low bit data was destroyed by compression or something

emanresu A

Yeah, imgur weird

Or, annoying if you want the original image

Is this from the spec of that old challenge from a few years back, or something else?

Redwolf Programs

What?

If you mean the images and stuff, they're from this

emanresu A

Oh, I thought that was dead

I have a quite easy one if you want it (I can just undelete)

Redwolf Programs

7:25 PM

I looked at it a little yesterday, I'll attempt it if you undelete it

emanresu A

Ok, there you go

(I forgot you could see deleted posts)

tjjfvi

I'm so confused rn

Ginger Industries

et voila codepage complete!

tjjfvi

There is a difference between the llama message with code and the llama message from nov, right?

Redwolf Programs

Yep

What are you using to check?

tjjfvi

7:27 PM

Photoshop

I only see two pixels of difference

And those are the two pixels I manually changed

...Maybe I put the same image in twice

emanresu A

@tjjfvi The llama was created with a special colour pallete that takes up one bit per pixel.

Redwolf Programs

*1 byte

But the stegano llama doesn't use PSIF

emanresu A

@RedwolfPrograms Exactly!

tjjfvi

^ is the diff I get

Ginger Industries

@tjjfvi a photo of caird's soul

tjjfvi

7:32 PM

That one white pixel is one I manually changed in the llama's leg to a slighter lighter black

So either photoshop's diff is completely failing me

Or there is no difference between the two

Redwolf Programs

The difference is not going to be visible

It's very subtle changes to the pixel values

I'd estimate maybe four times below what's easily noticable with the naked eye

Perhaps brightening would work?

tjjfvi

This should blow out the pixel differences

emanresu A

Nov 14 at 2:00, by Redwolf Programs

Any pixels not in there have been modified

tjjfvi

Hmm ok

I'll check that later

For now I should stop procrastinating

hyper-neutrino

... someone at a high school in my city got stabbed???

Redwolf Programs

7:36 PM

@emanresuA That's likely a bugged color palette

hyper-neutrino

apparently some students from two different high schools got into a fight by the marketplace near there and there was an axe, a machete, and a baseball bat involved. i'm so confused

@tjjfvi this is what I get if I replace the black in your image with white

Redwolf Programs

@emanresuA Cracked

gist.github.com/RedwolfPrograms/…

emanresu A

I know, nice job

Redwolf Programs

Ooh my rep is a permutation of 01234 now

@emanresuA I wasn't sure if I should post it in the comments or here so I did both, probably didn't need to lol

emanresu A

The challenge is really overengineered, being both really open and really strict.

pxeger

7:49 PM

SE down?

Redwolf Programs

Not for me

grandBagel

@RedwolfPrograms nice

pxeger

grandBagel

@RedwolfPrograms Mine is a permutation of 139. (Counting by threes.)

Redwolf Programs

Must be an outage in a more local datacenter or something

Adám

7:51 PM

@pxeger Only SE Chat.

Redwolf Programs

@hyper-neutrino That's...really interesting

It's halfway what I expect, but halfway not

Fmbalbuena

@pxeger Bug

in CGCC

because wrong logo

Redwolf Programs

The fact there's a nice repeating pattern is very odd, since there shouldn't be

Adám

@pxeger Maybe a cache from the earlier outage?

pxeger

back now

@Adám I don't think it can have been that, because it was taking like a minute loading before finally displaying that error

emanresu A

7:55 PM

@RedwolfPrograms I have another idea, but it requires reverse-engineering hash functions

(To get the final image)

Redwolf Programs

Sounds like you probably need to change your idea a little then :p (or uses a "hash" like CRC or something XOR based that's more reversible)

Sandbox Posts

0

A: Sandbox for Proposed Challenges

Which title i should put? Challenge: Check if the Input is any shorter string (Call X) (len(input())>len(X)) X can be reshaped with the size bigger than the length of the string. Examples: The string "abba" returns Truthy becacause "abb" can be reshaped to the size of 4. The string "acc" returns ...

Fmbalbuena

^ Any feedback?

Oh i forgot to add the testcases

Redwolf Programs

I'm getting worryingly close to vote capping today

grandBagel

@RedwolfPrograms I already am at the vote cap.

Does anyone have an image where each pixel is a random color I can use?

Redwolf Programs

8:01 PM

Sure, just a sec

How big?

grandBagel

@RedwolfPrograms 200x200

Redwolf Programs

There ya go

Joseph Walker

Hey, I finally got a division algorithm together. I used it to answer the translate arithmetic to brainfuck question.

Redwolf Programs

@grandBagel gist.github.com/RedwolfPrograms/… will generate as many as you need

Fmbalbuena

in The APL Orchard, 29 mins ago, by Fmbalbuena

CMC: check if the list equals to one of "number⍴string" (number > ⍴string) even if i don't understand and recreate but i understand

@RedwolfPrograms ^

emanresu A

8:11 PM

@JosephWalker Nice :p

That was a seriously hard thing to answer

Redwolf Programs

Used one of my last few precious upvotes for the day on it :p

Down to two

Ginger Industries

and we're done!

PyPOL now has the ability to compile APOL programs to an .abf bytecode file and back

grandBagel

@RedwolfPrograms How can I ensure its rgb value sum is a specific value?

Redwolf Programs

Start with all pixels being 0x808080 and do a certain number of repetitions of increment one pixel then decrement another

Is this a modular sum or a normal sum?

And is it per-channel or overall?

grandBagel

I meant iterate over every pixel, getting its RGB color, (e. g (31, 27, 128)) sum it, and add it to the total.

Redwolf Programs

8:17 PM

nvm

Hmm, so getting a fairly uniform distribution of colors would be the hard part

grandBagel

@RedwolfPrograms I don't need it to be uniform.

Redwolf Programs

You could generate a random image, take the sum, divide by the expected sum, then multiply. That'll scale the colors to roughly the right amount, and you can apply random increments until the sum is exactly correct

That's much faster, and will result in a more uniform (but not perfect) result

emanresu A

Repeatedly add pairs of pixels with values adding up to (total sum / 2)

grandBagel

How to set a pixel color with Pillow?

Fmbalbuena

@grandBagel find in SO.

Ginger Industries

8:21 PM

applause

Fmbalbuena

@GingerIndustries use \* and wdym?

Ginger Industries

@Fmbalbuena sorry, was referring to my above statement

tjjfvi

@hyper-neutrino Seems like that's just an artifact of the screenshot / imgur compression

grandBagel

@Fmbalbuena So can I declare one with size (1, 2). When I use image.putpixel((1, 1), <some color>), it gives me a error.

Redwolf Programs

I'm thinking we should probably delete this, its answers contain a lot of (obviously) malicious code

Oh there's only three answers lol

Still, two out of three are intentionally harmful

grandBagel

8:31 PM

@RedwolfPrograms Agreed

Redwolf Programs

10k users, your DVs would be appreciated

emanresu A

DV'd

grandBagel

@emanresuA What does DV stand for?

emanresu A

Delete vote

grandBagel

@emanresuA What should I flag it as? Custom?

Redwolf Programs

8:36 PM

Don't bother flagging it

emanresu A

^

Redwolf Programs

It'll either send it to a queue for deletion, when it already only need one more DV, or it'll bother a mod

emanresu A

There should really be a delete vote review queue

Redwolf Programs

10k tools basically are that

Fmbalbuena

@grandBagel ask to SO

hyper-neutrino

8:44 PM

@tjjfvi ah. that makes sense

also delete vote should be VTD (vote to delete) cuz DV is downvote

Redwolf Programs

No, VTD is Vote That Down :p

hyper-neutrino

ಠ_ಠ

3

emanresu A

Great, I have to go away for the next three days

hyper-neutrino

rip

emanresu A

AoC is going to go horribly

Redwolf Programs

8:47 PM

:/

TNB won't be the same without you

Ginger Industries

:\

need example image suggestions for codegolf.stackexchange.com/questions/223158/…

Redwolf Programs

@GingerIndustries Cats and trees

DLosc

@hyper-neutrino I wonder how many times you've posted this exact message and it's gotten starred. I think it's happened at least twice in the past week or two. :P

Redwolf Programs

and snow

hyper-neutrino

@DLosc well, all I can say about that is: ಠ_ಠ

Ginger Industries

8:53 PM

ಠ_________________ಠ

Redwolf Programs

lol

Ginger Industries

ಠಠ_ಠಠ
they didn't call me four-eyes for nuthin

@RedwolfPrograms time to break out thiscatdoesnotexist.com

DLosc

@hyper-neutrino Huh, those are the only two times. Insert "If I had a nickel..." joke

hyper-neutrino

interesting

feels like it's been more

emanresu A

@DLosc Five times including it, just those two as a message on its own

And 11 pages total

ಠ_ಠ

Ginger Industries

8:57 PM

we can probably extrapolate from that to figure out when the next ಠ_ಠ will appear

Redwolf Programs

→ 8 fun misinterpretations moved to Fun misinterpretations

Fmbalbuena

lol

lel

lul

lal

lil

lyl

Ginger Industries

ಠ-ಠ

Redwolf Programs

ಠ¯ಠ

3

Ginger Industries

ಠ=ಠ

Adám

9:01 PM

OK, let's not have those faces get out of hand.

Ginger Industries

ಠಠ

DLosc

@Fmbalbuena alphacentauri.fandom.com/wiki/Pravin_Lal

Fmbalbuena

lal lbl lcl ldl lel lfl lgl lhl lil ljl lkl LLL lml lnl lol lpl lql lrl lsl ltl lul lvl lwl lxl @lyxal lzl

Ginger Industries

what

Redwolf Programs

Okay that's probably enough /l.l/s

Ginger Industries

9:02 PM

reddit.com/r/ihadastroke

Fmbalbuena

@RedwolfPrograms why /l.l/s?

Ginger Industries

¯\_(ಠ_ಠ)_/¯

Fmbalbuena

@GingerIndustries lyl lol lul lrl lal lrl lml lil lsl lcl lul ltl

Adám

3 mins ago, by Redwolf Programs

Okay that's probably enough /l.l/s

Ginger Industries

(╯ಠ_ಠ）╯︵ ┻━┻

Fmbalbuena

9:07 PM

oh sorry for saying l.l

@GingerIndustries stop

Adám

@GingerIndustries In APL, you can write that as ⍉⍪

Ginger Industries

@Adám a prime example of golfposting

since when have I had 1091 reputation

Redwolf Programs

That's your network-wide rep

Ginger Industries

@RedwolfPrograms ah

I am a person

9:25 PM

hi everyone

Ginger Industries

@Iamaperson hi to you too

Redwolf Programs

Hi!

Been a while

Ginger Industries

okey, I've posted a challenge to codegolf.stackexchange.com/questions/223158/…

good luck

:)

Redwolf Programs

Exciting!

Ginger Industries

jazz hands

okay it's possible I screwed up

Adám

9:38 PM

@Iamaperson Hi Basketball.

nope nvm it worked

@Adám ಠಠಠಠ_ಠಠಠಠ

Doesn't look like there's anything in the image low bits, or the metadata...whatever you did must be pretty interesting

Ginger Industries

@RedwolfPrograms sir i don't even know what I did

@RedwolfPrograms i just kinda threw together an algorithm

i've g2g, good luck with those images

Redwolf Programs

9:44 PM

o/

Fmbalbuena

10:07 PM

@Iamaperson hi

lyxal

@GingerIndustries he wide

Sandbox Posts

0

A: Sandbox for Proposed Challenges

Operator precedence is dead Calculate the result of some math expressions using the following constraints: Numbers will be between 0 and 9 Operators are + - / * Expressions will always have the format Number operator number operator number... Parenthesis have the highest precedence The order of ...

lyxal

10:27 PM

@RedwolfPrograms so does that mean it's time for you to start development on your new secret golfing language?

emanresu A

10:49 PM

I think that was 2022

Redwolf Programs

@lyxal No, I've decided this year's project will be RTO

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