@ChrisJester-Young How could I make a fixed-sized list in Racket? I want to make an 80x24 grid

@Mego Yes.

@quartata (make-vector (* 80 24))

@ChrisJester-Young Oh, well that was easy lol

@quartata You can also use make-list but that's nonsensical because: 1. Racket lists are immutable, and 2. Lists are not random-access, and the kind of grid you're talking about sounds like you want random access. ;-)

Do they not have matrices? I could do a vector of vectors I suppose.

@quartata if you find vectors too slow, this might be faster (using typed racket) docs.racket-lang.org/math/array.html

@quartata Yes, it's called array.

@quartata But I usually just use ny+x indexing myself (one-dimensional vector).

@ChrisJester-Young Yeah, that works

@quartata Either use one-dimensional vector or use an array; don't do jagged arrays (vector-of-vector).

Yikes, arrays look slow.

I'll just roll with a one-dimensional vector.

@ChrisJester-Young I learned that the hard way

@quartata Cool.

@Winny Yeah, it's an important lesson.

Why is C++ so insanely popular in Code Jam? I'm not saying it's a bad choice, but it's not the trend I perceive outside that competition.

So you can use λ instead of lambda? Oooh pretty unicode

Not that popular.

@Mego wow totally brute forceable

oh

are you doing an actual answer for that?

@quartata yes, and it's 4 bytes shorter so it's a easy win for golfing

@Dennis That's because C++ is an awesome language. :-D

@Dennis A lot of competitive programming people I know use C++, although that's largely because Python wasn't allowed in the competition we had until last year (although some still prefer C++ because of the time limits for problems)

Ah, time limits would certainly be a good reason to prefer C++ over, say, Python.

^

Pypy is good, but not magical.

PyPy's good, but it's not always faster though

ninja'd

Hello again

@Mego Opinions on the newlines/indents rule? I'm having trouble deciding

@QPaysTaxes Given up lol

@QPaysTaxes My thread is on hold also

@KennyLau I see you commented on Phi's cop - does I/O still need to be revealed with the new rules?

@Sp3000 I guess not... it's on hold though

@Mego No examples is fine, but then it just means any submission that produces any OEIS sequence would count right?

@QPaysTaxes Didn't see nothing

@QPaysTaxes lol

@KennyLau The idea of on hold is just to stop the question from receiving answers while it's being improved. If you clarify the question well enough, reopen votes will come.

@Sp3000 What do you think? How many characters should be revealed?

@Mego I said it clear and loud.

@Mego "However, any proposed source code that produces the same set of output also counts as valid (you are encouraged to reproduce an actual sequence in the OEIS)."

Apparently nobody ever reads this

I should put it in bold.

@Mego I'd consider the empty sequence to be a subsequence of any sequence, maybe it's just me

@ChrisJester-Young Thanks! :)

@KennyLau I did read it, but I only asked the question to make sure I'd understood that sentence correctly :P

how well do you need to do on gcj to qualify?

Examples help, yeah

@Maltysen See questions, 30 points for qualifier

@ChrisJester-Young Which is preferred usually, (for or (for-each?

@mego done

@Mego \o/ at 25

@AlexA. You've had the same girlfriend for seven years, right? I'd say that's plenty enough to count.

@Maltysen Get 30 in smalls just to be safe, in case you mess up large

@quartata If you're writing standard Scheme, for-each is your only option. If you're writing Racket, I'd prefer for.

@Sp3000 Anything more unclear?

@El'endiaStarman However long from when we were 18 to now is, yeah

Peeps, how many characters should be revealed?

@Dennis I had actually originally envisioned it as something that programmers would tell their significant others, but the responses I've gotten have been from the other direction, so to speak, which is valuable also.

@Sp3000 wait so they take away your points if you mess up larges?

@Maltysen Yep

@KennyLau min(program_length/5, 25)

The points for large are applied assuming you get it right, then taken away if you don't

@NathanMerrill okay.

@El'endiaStarman Yes that's 7. I'm bad at math. ._.

wait no

that's the wrong answer

@QPaysTaxes Hah, thanks

@ChrisJester-Young OK.

min(4*program_length/5, 25) should be hidden

@Mego ...yes... >_>

@NathanMerrill Which one?

@KennyLau It's looking better atm, but just to nitpick: if a code has a line that starts with space but it's not used for indentation (e.g. if it's in a multiline string), does that mean I don't have to reveal it?

the latter

@Mego small I'm just gonna use NetworkX to make a directed graph with all edges len 1 and shortest path len

@NathanMerrill So if I have a code 10 bytes long, I can hide every?

@QPaysTaxes .oO(I'm married 9 years, lol.)

@Mego ಠ_ಠ My BS is in math with a minor in stats. My master's will be in applied stats.

my bad

maybe he meant 0.8*program length

yeah

0.8

so, a 10 char program hides 8

but a 100 char program only hides 25

@QPaysTaxes I'm a comparatively young fart.

encourage golfing

@NathanMerrill okay, good

@Mego what in what now

@AlexA. he's saying that stats is BS

@KennyLau are robbers allow to fill spaces with noops?

D: why do i keep getting a wrong

@ChrisJester-Young Me too. :)

:-D

@Mego lal

I haven't heard the ones for MS and PhD

@Mego Thankfully my degree is a BSc. ;-)

Probably the most irrational decision I've ever made.

@Mego Higher and Deeper :P

@Mego I didn't have a romantic relationship until I was 20...and I'm still in it, 3 years later. :D

@QPaysTaxes ok

@ChrisJester-Young Technically mine is too, it just depends on whether you spell "realize" with an s or a z that you call it a BS or a BSc. :P

@QPaysTaxes no way

@AlexA. Exactly!

@QPaysTaxes noted

its up to the cops to force a sequence

@El'endiaStarman so basically there's a small chance that I won't be a loner forever. :)

@El'endiaStarman My first and only romantic relationship started when I was 25.

Oh, did robbers not need to output an OEIS seq? That doesn't make sense o_O

anything more?

I was under the assumption they did

Ah you've edited, k

@KennyLau as I think about it, I'm not sure you need any rules about characters hidden

I mean, let them any any amount of characters they want

@NathanMerrill So I could just hide everything

yes

@NathanMerrill Why?

@Sp3000 ( ͡° ͜ʖ ͡°)

if you hide everything, the robbers have an easier time

because they can simply find the sequence, and generate it

if you have letters in certain places, it actually makes it harder

^^ was wondering about that myself

(Nathan's comment I mean)

@Sp3000 how many points are the larges? if I solve all smalls, will i get 30?

@Maltysen Scores are on the left, different per problem

In this case, yes all smalls is enough

do you guys disagree? Wouldn't a completely-hidden program be easy?

hah, does Coin Jam literally give you the test cases in advance

you don't even have to care about performance; you can literally just bruteforce it

its to the cops' advantage to show characters

@Mego Counting sheep is 7

@QPaysTaxes yes

@ChrisJester-Young One last question: is there a version of (list-tail that modifies in place?

@QPaysTaxes oh I forgot about that

we still didn't fix that

:/

@Sp3000 well unless you're an idiot and don't get a-large…

ninja'd

how are you guys doing factorization? I was generating a seive, but that threw an memory error

Well if you're confident in A large, you could use that in case of D small I guess

@NathanMerrill you don't need to

or you could just do Coin Jam small and large

@QPaysTaxes I'll take another look at it tomorrow. I can probably figure it out if I actually give it my full attention

@NathanMerrill construct a prime table first

(I've already done A small and large though)

you just need a prime factor

@Maltysen oooh, clever

wait no

@NathanMerrill you're talking about c in gcj right?

yeah

@NathanMerrill so just do trial division till u get a factor for each base

@Mego which gets too big

bah, I don't want to brute force it

@NathanMerrill project Euler IIRC had you make a sieve for up to 10 billion which worked in python

@Maltysen the numbers are much larger than 10 billion

are you doing large?

yeah its 10^32 at the largest

I think that a non brute force would involve finding composites in each base and seeing if they fullfil the criteria

@quartata How could you have a modify-in-place list operation when lists in Racket are immutable?

@ChrisJester-Young Because I'm dumb

@Mego the largest number is "1" 32 times in base 10

which is effectively 10^32

oh, I understand

yeah

so, either I need an efficient factoring function

or I need some way to generate numbers

@mego how's it?

but you don't need to factor

I think the latter is more interesting

you just need one factor

@NathanMerrill but yes that is true and probably the only way in 24 hrs

@AlexA.: When did you start coding in earnest?

@El'endiaStarman I haven't used Earnest. Is it compiled?

(I'm kidding)

At least that pun isn't as bad as another potential one... :P

:P

Care to golf this?

@El'endiaStarman ( ͡° ͜ʖ ͡°)

@AlexA. What's the probability that you'll respond to a serious question non-seriously?

@AlexA. arstechnica.com/civis/viewtopic.php?f=20&t=83818

@HelkaHomba Pretty high, it seems. :P

@HelkaHomba Mu.

@HelkaHomba About 0.8

@AlexA. Not sure if this is serious or not...

@HelkaHomba The probability that it's non-serious is 0.8

@Sp3000 I don't understand

@Sp3000 For the record, "HobbesianTiger" is not me

@AlexA. Right, but how do I know if your response to my serious question was serious?

@HelkaHomba Well, if P(non-serious)=0.8, then P(serious)=0.2.

So there's a good chance 0.8 is incorrect

You're assuming non-serious and serious are complementary events, which may not be true

or, wait..

@Sp3000 😏

@Mego You're a high rep user on this site. You're serious about something non-serious. QED.

@Mego In logic, yes. In real life...

Seriously Beans?

Wait not

@Mego Didn't quartata make that?

@HelkaHomba uh no

Mego made Seriously.

I made pl.

Penguins are gliders. Cut me some slack

(and Rotor which I'm ashamed of, as well as Cinnamon Gum which isn't really ready yet)

@AlexA. Reason I was asking is that I'm curious as to whether you were already a programmer by the time you started dating. The responses I've gotten so far are making me think I should do two blog posts, one from the programmer's perspective and one from the other perspective. So, like, if you could go back in time 6 or 7 years and give your girlfriend advice or something on what it's like to date a programmer, what would you say? (And conversely for her.)

@Mego Pretty accurate

@AlexA. How

@Mego I'd appreciate feedback from you too. :)

I think my new CnR answer is actually pretty difficult: codegolf.stackexchange.com/a/77437/2867

"Difficult" being relative for something with only 5 hidden characters.

Phi just got steamrolled

@AlexA. What

@HelkaHomba With videos?

yes

What does that video have anything to do with my reply

@El'endiaStarman I don't think I've ever really considered myself a programmer. What I do now is pretty specialized and I've only done it for a few years now.