The Nineteenth Byte

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OldSandboxPosts

01:00

Sandbox posts last active a week ago: The hardest logic puzzle game: Help me reduce my oversized proofs!

3 hours later…

New Posts

03:38

Q: Is it a tetrate of two?

The tetration operation consists of repeated exponentiation, and it is written ↑↑. For instance, 3↑↑3 =3 ^(3^3) = 3^27 = 7,625,597,484,987 A tetrate of two is an integer that is equal to 2↑↑n for some nonnegative integer n. As an edge case, we say that 2↑↑0=1. In this challenge, you will be give...

1 hour later…

Simd

05:00

@DLosc I should really pose a challenge for this

@UnrelatedString sounds messy

2 hours later…

Sandbox Posts

06:39

A: Sandbox for Proposed Challenges

code-golf Print the largest hidden double Given a sting of space delimited words, find the longest word such that, when that word is replaced with spaces, it is still a subsequence of the remaining string. Then, replace everything, except for one such subsequence, with spaces. Print the result ex...

Bubbler

06:51

@Simd linear time algorithms are not "easy" for sure. for a slower algorithm, you can brute-force over all edges to test if an edge is a bridge; remove the edge, count the connected components via e.g. flood fill, and check if it is 2 (bridge) or 1 (not)

the latter algorithm is O(n^2) at best

5 hours later…

New Posts

12:19

Finna got among us drip and I'm dripped out to the max with sigma rizz and Ohio skibidi toilet tax. No sus here keeping it 100% pizza tower.

Ginger

12:35

noodle man

💯

noodle man

13:23

A: Is it a tetrate of two?

JavaScript (Node.js), 25 bytes f=(n,i=1)=>n-i&&f(n,2**i) Attempt This Online! Output via exit code, error on false. JCrams to 8 bytes with no changes made, maybe changing variable names would help: π⑧⁸Ⓑ⌾⏦⍖⑦

is this answer cheating / abusing the I/O default? it seemed OK to me based on other answers I’ve seen but it seems like maybe this is not allowed

i have no problem deleting it if it is cheating

lyxal

So it exits with error code 0 when fine and error code 1 when not fine?

noodle man

yeah but as Mukundan pointed out in the comments the fact that it errors out is based on the recursion limit which is usually assumed to be infinite right?

but also languages defined by implementation

lyxal

Interesting. Well if an infinite recursion limit is assumed, then the answer never terminates so it'd be invalid. But assuming a finite recursion limit, there'd probably be a number outside of the recursion limit that gives a false positive

I don't remember whether it's assumed all numbers need to be supported if there's not a specified range or if it's just data type

I would say that if it works for all numbers <= 2^53 it's fine

That is, the finite recursion limit used in your implementation handles all numbers

(2^53 being the largest number in the default number type in js)

1 hour later…

hyper-neutrino

14:42

@noodleman I guess maybe if you wanted to nitpick you could judge it based on if it's the language implementation or the execution environment that causes it to crash

I suppose you might be able to make a case for something like this in Python where you'll get a recursion limit error from the language itself before you actually segfault and the limit can be changed

Ginger

well,

>>> def recurse():
...     try:
...         recurse()
...     except RecursionError:
...         # just say no!
...         recurse()
...
>>> recurse()
^Cobject address  : 0x7f5470599300
object refcount : 3
object type     : 0x55c46df46160
object type name: KeyboardInterrupt
object repr     : KeyboardInterrupt()
lost sys.stderr
>>>

see also

3 hours later…

Adám

18:07

Vyxal on HN

emanresu A

Cue dozens of people making the same complaints about golflangs that we got past ten years ago

New Posts

Q: Find the odd one out

Challenge The goal of this challenge is to generate and output a \$16 \times 32\$ (height \$\times\$ width) grid where all cells contain a decoy character, except for a random single cell that contains the target character. The input will be a pair of ASCII characters: [target,decoy], where targe...

code-golf ascii-art

caird coinheringaahin g

18:42

@emanresuA From a quick read, it doesn't actually look that bad

DLosc

19:07

Is there an actual article, or is it just "Here's a link to a GitHub repository. Comments?"

3 hours later…

lyxal

21:53

@Adám that explains the 26 new repository stars :p

math scat

22:05

Hey that's cool!

> by tosh

feel like I've seen them somewhere before

Adám

@lyxal Can you give chat.stackexchange.com/users/594696/user23498964 access to chat.stackexchange.com/rooms/52405/the-apl-orchard?

lyxal

Done

Adám

Thanks. Can you do chat.stackexchange.com/users/594700/user20133388 too?

lyxal

Added

@DLosc the latter

Adám

Awesome.

lyxal

22:13

It's very helpful that you give me chat profile links :p

Makes the process a whole lot easier

Adám

Sure thing. While going through this process 120 times, I've learned what the mods need to make their work as easy as possible.

(I'm a slow learner.)

lyxal

@Adám no, you're Adám

(:p)

Adám

Ah, damn.

lyxal

Yeah that's roughly it

Seggan

@mathscat hmm

Adám

22:26

When I first started working at Dyalog, I was basically an apprentice of someone named Dan. When we'd commit changes we'd made together, we used to sign the code with "adamn".

lyxal

Efficient :p

Adám

Dan was.

lyxal

Sounds like Dan would have fit in very well here :p

Adám

Yes:

> Thanks to the colleague in question for shaving off one byte.

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