The Nineteenth Byte

@xnor Do you think a Find a maximal discrepancy-2 sequence, allowing any one of them as output, would be sufficiently different from your challenge? I have a feeling one would require less hard-coded information for this.

totallyhuman

i dislike stack's disallowance of png's as avatar :/

user165474

It worked after I turned off links lol

user165474

@totallyhuman it doesn't allow png avatars? :I

totallyhuman

yeah

Phoenix

9:11 PM

For me, SE just imported my avatar from Google.

totallyhuman

like mine, it was a png but it gave it a white background :\

user165474

rip :I

Dennis

That's still a PNG. They just made the background non-transparent.

user165474

I think SIGSEGV got it working

totallyhuman

@Dennis right, yeah... but you get my point

hang on

cyoce's avatar's background is transparent

Dennis

9:14 PM

Probably Gravatar.

MD XF

Anyone know how I can subtract 1 from a number using only the !,%, << and >> operators?

totallyhuman

@Dennis what's gravatar?

Dennis

en.gravatar.com

Business Cat

It makes those fancy images that are the default avatars on SE (and other sites)

Dennis

SE lets you choose between uploading a picture and using the one from Gravatar. It's tied to your email address.

Cyoce

9:18 PM

@Dennis please pull J-uby for TIO and is there a way to do command line flags for TIO?

Dennis

@Cyoce Pulled. Please elaborate. What would you execute on the command line?

Cyoce

@Dennis well let's say I want to run the J-uby code with the -i setting. how do I do that through TIO?

Dennis

ruby -i /opt/J-uby/func.rb .code.tio
ruby /opt/J-uby/func.rb -i .code.tio
ruby /opt/J-uby/func.rb .code.tio -i

Which of these are you trying to execute?

totallyhuman

yesss

Phoenix

Probably the second one.

totallyhuman

9:25 PM

i have a transparent background

Phoenix

Not really a good reason to use the first one.

NoOneIsHere

@trichoplax Yep, I did

Phoenix

iirc what ruby -i does is performs operations on the code file itself, so the file self-modifies.

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Keeping a low profile... internet stack-exchange-api image-processing You know when you go on the account of a very active user and it shows this image? image to come. image is the "This user hasn't posted yet" image Let's make you feel the same rage! Task You are to take the user ID of a S...

xnor

@Dennis I'm not sure. Do you have a sense of roughly how many length 1160-solutions there are?

I had expected maximal solutions to be fairly rigid, but maybe that's not the case

there are likely local swaps like swapping a + and - between two nearby primes

Dennis

9:45 PM

My gut tells me that there should be a lot of them, but that's it.

xnor

what's your guessing heuristic that's so effective?

a set of 90 indices takes 452 bits of entropy, which is more than i'd guess

PhiNotPi

What is this?

xnor

Compress a maximal discrepancy-2 sequence

Dennis

@xnor For composite indices j, find the smallest prime factor p of j and return the product of the elements and indices j and p/j. For prime indices, compute 1 + the sum of every third element and return the negative of the sign.

xnor

interesting

so it guesses that the sequence is multiplicative

does the prime guess have a rationale, or is it just overfit well?

Cyoce

9:53 PM

@Dennis ruby /opt/J-uby/func.rb -i .code.tio. Also pull again please because I fixed a bug.

Dennis

More of less, yes. The paper mentioned multiplicative sequences, so I assumed their algorithm peeked at the lowest prime factor. The results are a lot of worse with other choices (second prime factor, complete factorization of j, etc.).

xnor

and this is not using any hard constraints of forced values?

Dennis

@xnor Just trying to steer the modular sum towards 0. Every third was product of trial and error.

@xnor Not sure what you mean / what this refers to.

xnor

@Dennis i mean that your heuristic that classifies all but 90 elements is allowed to guess bits that would violate the discrepancy-2 property

@Dennis But primes aren't multiples of 3? I'm surprised that this beats just trying to steer the overall sum towards 0.

i wonder if it's effective overfitting or if there's a heuristic reason

Dennis

@xnor No, it is not. The algorithm first tries to determine if the element has to be 1 or -1.

Dennis

10:12 PM

@xnor At an odd index, the sum will be odd, so the previous elements sum to 0 and you're left with a coin toss.

user165474

rip I got -40 today from user removal

user165474

and -100 for a bounty

user165474

and I still have positive rep change lol

user165474

Question: If someone repcaps and then gives a bounty, can they proceed to keep getting rep?

Dennis

Nope.

user165474

10:20 PM

:(

Jan Dvorak

Yes, from accepts

user165474

oh okay

PhiNotPi

I never accept anyone though.

ATaco

I disagree with that practice

I've never been accepted, despite winning multiple times.

Adnan

I always accept an answer

Dennis

10:33 PM

So do I (prime catalog excluded).

PhiNotPi

I could probably accept some people for code-challenges/KOTHs I've done, but I don't typically do code-golf because there's not really a winner in my opinion.

ATaco

That's the sort of thing that denies users rep and badges

user165474

I've never been accepted even though I've won a few times after I stopped using Python for everything :P

user165474

I feel like the first person to answer the Tetris GoL challenge will repcap every day for like a week in a row

Dennis

I understand the reasons behind both practices. It makes zero sense to compare Java answers with Perl answers, but the golfing languages still have a cross-language competition.

Riley

10:45 PM

@HyperNeutrino When dim answered Build a digital clock in Conway's Game of Life he rep capped 13 of the next 16 days.

user165474

:o

user165474

lol if caps didn't exist dim would get 9230 just from that

Adnan

Exactly, especially since one of the main reasons for developing a golfing-language is to compete with other languages.

user165474

that's more than the rep dim has :I

Riley

@HyperNeutrino He/she lost at least 3669 rep to the cap.

user165474

10:48 PM

oh wow

KuanHulio

i went from 21 rep to 124 rep today

Riker

very nice

you've also only made any posts for 2 days now :p

not that surprising

KuanHulio

11:03 PM

gotta start somewhere

New Main Posts

1

Q: Rotate-Replace a String

Task Write a program or function that, given a string and a list of strings, replaces each occurrence of an element of the string list contained in the string with the next element of the string list. Example The string is The cat wore a hat on my doormat so I gave it a pat and the list is ["a...

Adnan

Thank you @NewMainPosts

KuanHulio

better

MD XF

11:19 PM

Prepare for a new sandboxed post...

Jan Dvorak

uh oh

New Main Posts

-3

Q: Is it true or false?

I cannot believe that this hasn't been done before but I may be wrong. If so, just close as dupe. This challenge is very similar to Is it truthy or falsy? but, IMO, isn't close enough to be a dupe. That has predefined "falsy" variables that all languages must use, some of which aren't even falsy...

code-golf decision-problem

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Shortest C quine quine code-golf c There are a lot of quines in C with various byte counts. 76: main(){char*c="main(){char*c=%c%s%c;printf(c,34,c,34);}";printf(c,34,c,34);} 68: main(a){a="main(a){a=%c%s%c;printf(a,34,a,34);}";printf(a,34,a,34);} 66: p="p=%c%s%c;main(){printf(p,34,p,34);}";main(...

PhiNotPi

11:48 PM

I need to come up with some good golf challenge to recover credibility from my ;# challenge.

MD XF

Probably

PhiNotPi

Oh hey it's actually only at +20/-1 now

MD XF

Were you the inventor of the ;# language?

s/language/"language"

PhiNotPi

nope, I just rode the meme train for some easy rep

ais523

;# is a terrible language :-P

Cyoce

11:57 PM

still better than java

New Bounties With No Deadlines

0

A: List of bounties with no deadline

150 rep for a shorter C quine Currently, the shortest known C quine is 64 bytes. I will give 150 rep to anyone who tops this. Rules: Must be a full program (include the main function, or otherwise define main). Cannot use the filename to store data Cannot pull data from the internet Cannot re...

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