The Nineteenth Byte

H.PWiz

12:04 AM

Interesting: I finally managed to save a byte here in Python 3, but still can't save a byte here in Python 2

PhiNotPi

12:22 AM

@Dennis How was this not already caught by brute-forcers?

DJMcMayhem

12:47 AM

@PhiNotPi because 8^74 is a massive number

PhiNotPi

@DJMcMayhem But most brute-forcers I've heard of (including the one I wrote) are pretty well-structured. Both this 76-byte HW and the previous 78-byte HW are very similar in structure with two nested loops before the print statements.

user202729

1:14 AM

@PhiNotPi Currently there are no explanation.

ASCII-only

2:37 AM

Nice, grass HW has been beaten too (although it was probably super suboptimal in the first place)

I should probably bounty it (I should also probably wait until the current one is awarded first)

for linking purposes, ignore this:
https://tio.run/##hVRNb9swDD2bv4JtD5JrN0U@kBVB05429LZjDqlhOLbTGFMtQ3Lqeth/z0jZSVyg3Q42n0i@R1IStEns7nBIkxof8MUk1rajqsX7@@8/f4Ctk/TXci0KEYqGvmBMPy0iqIym3NelEJDlW9yWskxe8xAT82JD3Ois9RfgvSi9SRQ6lRB7DnhKp4mKnReXXXS9iDBwbPD6PAyWSEXxGlVeSg754G214ayu2Lbs7FtiGGBRuspUeKghaemJFQvJMRUZVF8vFjfjaFSUWf4uOzXfx8ARmv8S@rI@teXxNxyL6q77PqOPE70J8M45XQJvIalJk9tPJ/vHXg6lzzN@Pd0n2/sFYzDeud@@w1PLVlpuThVlbvksR7ZSRS3Fcyn60@IQn4xL4aPhQa95dcxFQTWucJcrpbHRRmVA90kUmQhxLd5FRCbyna9uijR37i1dxC4kRUsediB5/BCl@H1ytMKPfLzCZl8/PoJrWAjxDMEEnRYGYwhmRzyB4O6IZxCM58fFHQTTM2MOwfzEmRJpPDnR5jNIJ7Nv6HwN…

Hmm. @Dennis The new HW doesn't work in Brainbash, I wonder why. The error message isn't very informative (also I should ask @ConorO'Brien how Brainbash even works)

user202729

3:08 AM

@ASCII-only What doesn't work?

ASCII-only

the new brainfuck Hello, World! (see message this replies to)

user202729

@ASCII-only It doesn't reply to any message.

ASCII-only

crap it doesn't. oops

8 hours ago, by Dennis

primo's Hello World in brainfuck has been beaten.

user202729

@ASCII-only Why should it work? It isn't BF.

ASCII-only

@user202729 Because it's fully backward compatible with BF?

user202729

3:12 AM

The docs is too bad.

@ASCII-only No it's not ... wait is it? Let me read again.

ASCII-only

@user202729 It is, which is why I used the 78 byte one on RosetTIO

user202729

@ASCII-only No, this infinite loop.

ASCII-only

@user202729 because it's written badly...

@user202729 link

user202729

@ASCII-only And that crashes.

ASCII-only

@user202729 yes. i have no idea why. but it is meant to be fully backward compatible with BF...

user202729

3:18 AM

So -- it's not fully compliant with BF on TIO. (which uses 65536 circular tape)

@ASCII-only BF is under-specified.

ASCII-only

@user202729 no...

It just leaves a lot up to the implementation

@user202729 If you consider that underspecified then most practical languages are underspecified

user202729

@ASCII-only Correct.

ASCII-only

@cairdcoinheringaahing O_o so golfy

Conor O'Brien

4:13 AM

@ASCII-only BF with two tapes...

ASCII-only

@ConorO'Brien i can see that >_>. just that most BF programs should work right?

When do the cell limits increase

user202729

4:29 AM

@ASCII-only Currently not supported.

Downgoat

7:27 AM

To all rust people: How do I convert between error types effectively? I have this expression:

        Command::new("xcrun")
                .args(&["--sdk", target_platform, "--show-sdk-version"])
                .output()
                .and_then(|output: Output| String::from_utf8(output.stdout))

in which String::from_utf8(...) returns an error however it's of type std::string::FromUtf8Error while the expected type is std::io::Error

ASCII-only

@Downgoat tio pls?

Downgoat

@ASCII-only this is a snippet

ASCII-only

@Downgoat ok have testcase. now hmm

@Downgoat ok apparently it's Err(::std::convert::From::from(err))? but try block should handle the conversion

Downgoat

@ASCII-only that'll wrap it in a whole error though, which means i'll either have to add a giant ugly 4-line match statement

I think I found solution thhough

moonheart08

How do you implement software division? Software multiplication is fairly obvious, but division has all those nasty little hidden rules

I'm doing code for a system that can't do division on it's own

ASCII-only

7:39 AM

@moonheart08 the golfy way is repeated subtraction

the better way is bitshift magic to get result bits one by one

moonheart08

is there a bitshift magic way for modulo 10

if so, thank lord. either 10 or 16

ASCII-only

@moonheart08 16?

moonheart08

modulo 16 or modulo 10

i'm converting 16bit numbers to text

but really i need both division and modulo by 10 or 16

ASCII-only

but isn't 16 just 2**4

i.e. modulo 16 = n & 0xF, division is just n >> 4

moonheart08

d'oh. Thanks

ASCII-only

7:43 AM

for 10 it's quite a ~~bit~~ lot more complicated so i'd use 16 if possible

and much slower

moonheart08

i'll need 10 for actual UI. :/

At least my numbers are at most 16 bit

ASCII-only

@moonheart08 just conversion from binary to decimal?

also what are the range of the numbers

moonheart08

numbers cap out at what 16 bit can hold, max

unsigned

ASCII-only

~~if the range is small enough you can just do a lookup~~ nvm. maybe this might help?

moonheart08

plus, i'm working in limited RAM

lookup is impractical

i can take speed hits if it means i don't use up all 1024 cells (16bit cells)

yes. only 1024

i'm insane

ASCII-only

7:46 AM

@moonheart08 what are you trying to do with 1024 cells

moonheart08

magic. ~~ok it's a very tiny game. I'm doing insane person's golf right now~~

at least the character set is ASCII

ASCII-only

game?

moonheart08

tamagotchi ""clone""

for the R16K1S60

i really am insane

arn't i

yes it works \o/

thanks @ASCII-only

ASCII-only

@moonheart08 huh that was quick

moonheart08

inttostr:
mov bx, stringpad
.loop:
mov cx, ax
and cx, 0xF
shr ax, 4
add cx, 0x30
cmp cx, 0x39
jbe .skip
add cx, 7
.skip:
mov [bx], cx
add bx, 1
cmp ax, 0
jnz .loop
mov [bx], 0
ret

i just didn't know the algorithm :P

also, the skip thing there is to make it use A-F instead of some other characters

Soaku

7:57 AM

What do you think about this?

moonheart08

you know what. who needs base 10? We have base 16. I'll just use that due to size constraints

ASCII-only

@moonheart08 :P

why are the size constraints so low in the first place

moonheart08

ask LBPHacker not me. He's making a new computer with 4096 cells anyways

i'm just waiting on it's release

ASCII-only

@moonheart08 what is this? TPT?

moonheart08

yes. TPT. Again

TPT has computers

well great. i just realised the resulting string is reversed

:<

ASCII-only

8:18 AM

@moonheart08 10/10

Muhammad Salman

11:22 AM

hi

ASCII-only

hello

Muhammad Salman

How r u >

@ASCII-only I have a question ? (If you don't mind answering)

ASCII-only

@MuhammadSalman okay

Muhammad Salman

@ASCII-only : I am curious as to how to have a language added to TIO ?

ASCII-only

@MuhammadSalman just ping Dennis with instructions on how to run it

in the TIO channel of course

Muhammad Salman

11:31 AM

@ASCII-only Ok. Thanks

Soaku

12:23 PM

PHP: is there any way to use Laravel database API without installing Laravel itself?

Soaku

12:48 PM

oh, ok. nevermind

they have a separate composer download for it. great

Soaku

1:04 PM

btw, anyone want to play spyfall?

New Main Posts

2:04 PM

2

Q: Sum power of digits

Challenge : Given two non-negative integers (X and Y > 1) calculate the sum of digits of their powers . i.e : sum of digits of X ^ Y . Input : Two non-negative integers X and Y Output : The sum of digits of X raised to power Y X ^ Y. Examples : 5 , 2 ---> 7 9 , 4 ...

Dennis

4:40 PM

@PhiNotPi It seems to use an entirely different method. Unlike primo's answer, this one works in a non-wrapping interpreter.

Esolanging Fruit

5:25 PM

@Downgoat Can you use Result::map_err?

thecoder16

6:01 PM

@Soaku wrong site? xD

dzaima

6:15 PM

@thecoder16 it's not rare that someone asks here to join a game from Puzzling. Many people here = many potential players

thecoder16

yeah :) we really need more people in puzzling game sites.

they are dying :(

i'm on puzzling chat much more than here hehe

Soaku

@thecoder16 I asked here, because I don't have much chance attracting players in Spyfall itself

DJMcMayhem

@Soaku I've never actually played spyfall before, but I'd love to try

Soaku

@DJMcMayhem Good to hear :D but we need at least 4 players to start, the room is here

DJMcMayhem

How long is a round typically?

Soaku

6:24 PM

idk, varies

mınxomaτ

lol

Soaku

@mınxomaτ ?

mınxomaτ

The unspecificity of that response just amazed me.

dzaima

@Soaku average, mean, min&max, anything? Or does it really vary between a minute and a couple hours?

Soaku

@dzaima idk, 10-20 minutes, I guess?

I don't look at the time when I play

New Main Posts

6:58 PM

0

Q: Golf me the Schlosberg Numbers

Schlosberg Numbers From OEIS there is a set of numbers such that Integers m such that floor(sqrt(m)) is even. Although these are not officially named Schlosberg numbers, the first documented solution was by Joel Schlosberg in 2015 in Mathematical Reflections (5), thus I have names as such. ...

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Downgoat

7:20 PM

@ASCII-only btw an idea from rust is an/the "never" return type specifying that a function never returns for example exit() or perhaps some error functins

Nathan Merrill

7:31 PM

that's not a return type. It should be a keyword or something, but it's not a type

(yeah, I know they call it a return type, but I personally disagree with the way they did it)

Downgoat

7:44 PM

@NathanMerrill so like neverreturn fn myfunc() {}?

Nathan Merrill

something like that. It doesn't have to be that long, but yeah

Downgoat

We're doing something kinda similar for void. Rust & Swift alias it to an empty tuple (). We have the same syntax -> Void but it'll just internally set the 'returnType' field to none

Though now that I think about it, I think it could be replaced with just a func f() throws -> Void

Nathan Merrill

11:10 PM

@Downgoat what's your purpose for doing it, out of curiosity?

like, to me, there seem to be two primary purposes

one is to identify code that won't be ever executed

(statements after a System.exit() call)

the second is to make code safer (by saying that this function call might never finish/terminate)

the difference between the two is:

what's does the function of the following look like:

if (x) {
   System.exit()
} else{
    return 4
}

(the 3rd option is to make this uncompilable: You either never return, or always return)

but that's problematic, as it basically means that you can only call neverreturn functions from neverreturn functions (or the main function)

quartata

11:27 PM

@Downgoat C++ (and C11) also have noreturn

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Q: Is this a Boggle pad?

Given a list of case-insensitive ASCII letter strings ("words"), determine whether the entire list can be found on some four-by-four configuration of letter squares, in which no square can be used more than once in a word, and in which words are formed by moving from any square to any adjacent sq...

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11:48 PM

1

Q: File Permissions

File Permissions code-golf Adapted from the UIL - Computer Science Programming free response question "Carla" for 2018 District. Introduction In UNIX-like operating systems, each file, directory, or link is "owned" by a "user", who is a member of a "group", and has certain "permissions" ...

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