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J. Sallé
J. Sallé
6:00 PM
@ETHproductions Well, mine and some other public colleges here use eduroam directly.
 
Steven H.
Steven H.
6:11 PM
My current school has "<school name>Visitor" with no login required and "Air<Sports program name>2" with a login that's notoriously hard to set up, and then a departmental "Secure" network that somehow plays a role maybe. I've lost track.
 
ETHproductions
ETHproductions
6:28 PM
wow... my comp sci professor's homework rules are kind of dumb
"Documentation is not given any weight for this homework. However, you must do proper documentation, as it must be in your programming habit by now. The absence of documentation may lead to penalty."
You don't earn points by commenting your code, but you can lose points by not commenting... isn't that exactly the same though?
 
DJMcMayhem
DJMcMayhem
@ETHproductions I had a similar dumb interaction with my comp sci professor. Comments should just supplement readable code. You don't need to comment every line, just confusing lines. And yet she took away points for not enough comments until I had a comment on every line.
 
ETHproductions
ETHproductions
Yeah, it's even worse when the expectations on paper are different than how submissions are actually graded
 
dzaima
dzaima
@DJMcMayhem well then don't golf your homework :p
 
ETHproductions
ETHproductions
I've earned 7.5 out of 7.5 points on each homework so far, simply by getting everything working, making my code neat, and commenting appropriately
Meanwhile, I'm pretty sure about half the class is struggling to just get it working
 
DJMcMayhem
DJMcMayhem
You write code for fun. Of course it'll be slightly easier for you :P
 
ETHproductions
ETHproductions
6:33 PM
oops, read that the wrong way at first, haha
previous experience definitely helps, even if it's not with the same language
Anyway, I've got to catch a class. Talk to y'all later
 
Mr. Xcoder
Mr. Xcoder
Lol... Our CS teacher was asked by a pupil to recommend him another programming language to learn (we learn C++ (eugh!) in school). They said that Python is among the best choices. Two weeks later (today), the boy asked them a question about Python classes. They said they don’t know Python......
The same professor lost our test papers a couple of weeks back
 
Steven H.
Steven H.
Learning C++ isn't terrible, but the professor not knowing Python is... Well, ^ there you go. 5/7 standup professor, would take classes from again
 
caird coinheringaahing
caird coinheringaahing
Our french teacher 2 years ago lost our exercise books 2 months into the school year, then tried to fake it through the rest of the year by giving us worksheets and watching french movies :P
 
Mr. Xcoder
Mr. Xcoder
What are those important tests that you have to take at the end of the semester called in English?
 
caird coinheringaahing
caird coinheringaahing
Exams?
 
Mr. Xcoder
Mr. Xcoder
6:41 PM
Pfff not what I was thinking about. Maybe they don’t exist in England
 
caird coinheringaahing
caird coinheringaahing
We have mock exams in January/February, but don't really have exams at the end of terms
 
Mr. Xcoder
Mr. Xcoder
Oh, “thesis” I think
Anyway, we had the <enter “fancy test at the end of the semester” name> In geography
 
Steven H.
Steven H.
Finals?
Thesis is closer to an (academic) article than a test
 
New Sandboxed Posts
New Sandboxed Posts
7:02 PM
0
A: Sandbox for Proposed Challenges

Jakob LovernDNA Quine Problem Description Design a quine that outputs its own source code, but encoded into amino acids. Take your source code and expand it into base 4. Each digit now maps to a nucleotide like so: 0 -> A 1 -> C 2 -> G 3 -> T A set of three nucleotides produces an amino acid. You can f...

 
Conor O'Brien
Conor O'Brien
7:21 PM
CMC: output ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
 
quartata
quartata
+rG1G
(pyth)
 
Fatalize
Fatalize
@ConorO'Brien Brachylog, 5 bytes: ẠụwẠw
 
Anonymous
@ConorO'Brien Actually, 4 bytes: ú;û+
 
Oliver
Oliver
@ConorO'Brien Japt, 4 bytes: ;B+C
 
Erik the Outgolfer
Erik the Outgolfer
05AB1E, 2 bytes: žn
 
Anonymous
7:27 PM
Quick strawpoll for those present: what would you say are the top 3 stack-based languages on TIO for golfing (in terms of short code across a lot of different challenges)?
 
quartata
quartata
1. rotor 2. rotor 3. rotor
 
Fatalize
Fatalize
05AB1E surely is first?
 
quartata
quartata
11/10
 
Erik the Outgolfer
Erik the Outgolfer
1. 05AB1E 2. Neim 3. Actually
 
quartata
quartata
But seriously I would probably put MATL first or second, some of its builtins are surprisingly versatile
 
DJMcMayhem
DJMcMayhem
7:28 PM
@ConorO'Brien V, 6 bytes: ¬AZ¬az
 
quartata
quartata
It just doesn't have a codepage is all
 
Conor O'Brien
Conor O'Brien
@Mego stacked obviously /s
 
Pavel
Pavel
@ConorO'Brien (?A..?z).each{|i|$><<i if i=~/[a-zA-Z]/}
 
Anonymous
I'm looking for serious answers for a project I'm working on
 
Conor O'Brien
Conor O'Brien
@ConorO'Brien 4, 67 bytes: 3.60001601066216562202822620268205210212100120200091222200021210194
@Mego 1. 05ab1e, 2. MATL, 3. idk
 
Steven H.
Steven H.
7:32 PM
@ConorO'Brien alternate pyth: srB1G
Serious answers? 3. Seriously.
 
Anonymous
I'm just going to assume all "idk" votes are for Actually, since that's what most people think when they see Actually programs
 
DJMcMayhem
DJMcMayhem
@Mego 1. Brain-flak. 2. Brain-flak. 3. Brain-flak.
 
Anonymous
@DJMcMayhem Minimalist brainfuck-like langs need not apply :P
 
Pavel
Pavel
Is this for PPCG v2?
 
Steven H.
Steven H.
CMC: output ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz
 
DJMcMayhem
DJMcMayhem
7:38 PM
@StevenH. V, 3 bytes: ¬Az
Uhm... wat
 
Conor O'Brien
Conor O'Brien
@StevenH. 4, 39 bytes: 3.6000162065621578215200202000121210094
 
Erik the Outgolfer
Erik the Outgolfer
@DJMcMayhem wat
 
ETHproductions
ETHproductions
@DJMcMayhem That looks like maybe the same user editing their own answer?
 
Erik the Outgolfer
Erik the Outgolfer
the heck
 
caird coinheringaahing
caird coinheringaahing
@DJMcMayhem That's ais523
 
Anonymous
7:41 PM
@Pavel Nope, just a neat little thing I'm doing
 
Fatalize
Fatalize
@DJMcMayhem Accepted, pretty sure that's ais523
 
ETHproductions
ETHproductions
@cairdcoinheringaahing they deleted their account again I guess?
 
DJMcMayhem
DJMcMayhem
I don't get why they would go to such great lengths to not get reputation to prove that they don't care about reputation
4
It doesn't make any sense
 
Steven H.
Steven H.
I don't understand why not CW
 
ETHproductions
ETHproductions
Or do they just create a throwaway account for each answer now?
 
caird coinheringaahing
caird coinheringaahing
7:43 PM
@ETHproductions Yeah, they're doing a thing where they post answers, then delete the account to avoid the rep gains
 
Pavel
Pavel
@StevenH. (?A..?z).map{|i|$><<i}
 
Erik the Outgolfer
Erik the Outgolfer
@DJMcMayhem I think it's more complicated than that
it's not just that "they don't care about reputation"
it's that reputation brings them bad feelings and whatsoever or something
 
Fatalize
Fatalize
I would rather have him do that than lose half of the world's Brachylog users :p
 
caird coinheringaahing
caird coinheringaahing
Here's a conversation that explains it
 
Anonymous
Or, crazy thought: just ignore the rep?
 
Erik the Outgolfer
Erik the Outgolfer
7:44 PM
mainly because they hate the mod tools and such they don't let themselves gain reputation
@Mego or even just anonymize every answer, but I'm not sure if that's possible, since it likely involves SE staff and such
 
caird coinheringaahing
caird coinheringaahing
@DJMcMayhem Thanks! That was my 50th edit review :P
 
Erik the Outgolfer
Erik the Outgolfer
btw can anonymous accounts actually get privileges?
 
Anonymous
@EriktheOutgolfer Nope
 
caird coinheringaahing
caird coinheringaahing
@EriktheOutgolfer No
Of course, ais523 could explain it all himself :P
 
Anonymous
They don't have actual profiles, and no rep tracking is done
 
ais523
ais523
7:46 PM
I wouldn't have to delete the account so often if not for the fact that you can't delete an account immediately unless you have only one logged action
so the way account deletion works actually forces me to use a different account for each post
 
Erik the Outgolfer
Erik the Outgolfer
@Mego then I don't see why not just create an anonymous (i.e. not registered) account and post all answers from that one, since they don't get the privs anyways
 
ais523
ais523
there's one I forgot to delete, let me try to find it
IIRC it has a profile page
 
Pavel
Pavel
So do you keep around @ais523 for chat
 
ais523
ais523
also an anonymous account is purely cookie-based and my browser doesn't store cookies long term
@Pavel actually I tried to delete @ais523 generally but SE sucks at deleting accounts :-P
 
ETHproductions
ETHproductions
@ais523 What's this one?
 
Erik the Outgolfer
Erik the Outgolfer
7:48 PM
@ais523 I think you can restore it via e-mail address, or make an exception for PPCG's cookies
so that way you don't have to hassle yourself with deleting with every answer you post
 
ais523
ais523
@EriktheOutgolfer there are meta posts that imply you can restore an anonymous account cookie via the email, but I tried, it only gave me the option to convert it to a regular account but not to restore the cookie, so something changed at some point
@ETHproductions that's the one I forgot to delete
thanks for finding it for me
 
Erik the Outgolfer
Erik the Outgolfer
@ais523 still, you can make exceptions for cookies, right?
 
ais523
ais523
I have two browsers
one of them, my regular browser, is locked down heavily and can't contribute to SE because it doesn't run things like JavaScript
(the web is much less frustrating without JavaScript)
I use the other one for JS-heavy sites, like contributing to SE
but it's set to wipe everything very frequently (not just cookies, but things like history too)
 
FlipTack
FlipTack
Any python golfers got some way to shorten this?
 
Pavel
Pavel
@ais523 Except where nothing works without JS.
 
FlipTack
FlipTack
7:51 PM
Note, I don't think backticks can be used as we don't want a pesky L at the end.
 
ais523
ais523
@Pavel surprisingly many sites actually work better without JS
although I guess it depends on what sort of sites you visit
 
caird coinheringaahing
caird coinheringaahing
@FlipTack .endswith is nasty
 
Pavel
Pavel
I belive PPCGv2 is being built with noscript in mind.
 
FlipTack
FlipTack
@cairdcoinheringaahing Not as nasty as the alternatives
Splicing is longer
 
Erik the Outgolfer
Erik the Outgolfer
@Pavel dunno if that's possible at all
@ais523 oh
 
ais523
ais523
7:52 PM
actually, even SE works fine JS if you're just viewing it (the only things broken are contributing and expanding hidden comments)
 
Mr. Xcoder
Mr. Xcoder
How to tell if a post is ais': 1) it must be extremely well golfed 2) it's most likely in Brachylog 3) it's most likely from an unregistered user 4) it has a nice explanation 5) if the language has a quirk that makes the answer longer, the language is subtly being criticised at the end for that :P
 
Pavel
Pavel
@EriktheOutgolfer Why not?
 
Anonymous
@EriktheOutgolfer It is possible. We're doing it. We'll have basic form submission instead of fancy AJAX as an option for noscript.
 
ais523
ais523
@Mr.Xcoder there's at least one by me that I think people generally didn't realise was me, but that's at least partly because it wasn't in Brachylog
 
Pavel
Pavel
You lose things like the page autoupdating when there's a new post, but that's not really necessary.
 
Anonymous
7:53 PM
Of course, that means smashing the F5 key to view new posts instead of using a websocket, but that's the tradeoff that has to be made
 
Erik the Outgolfer
Erik the Outgolfer
@Mego ninja
 
Mr. Xcoder
Mr. Xcoder
@ais523 Link please ? :P
 
ais523
ais523
let me try to remember where it was
 
ETHproductions
ETHproductions
@ais523 Was it this?
Or was it not in Jelly either?
 
ais523
ais523
that one was mine but it's not the answer I was thinking of
(I thought people would guess that was me)
it's this one
which is a trivial answer to a trivial question, so there's less room to show through
 
Mr. Xcoder
Mr. Xcoder
7:55 PM
Yeah I could have told immediately that was you, quite obvious
 
Erik the Outgolfer
Erik the Outgolfer
huh, that answer pretty much looks like yours
 
ETHproductions
ETHproductions
That was the next one I was going to suggest :P
 
ais523
ais523
I'm not really trying to hide
 
Mr. Xcoder
Mr. Xcoder
Because it has a huge explanation for such a triv answer
 
caird coinheringaahing
caird coinheringaahing
@ais523 In case you don't get notifications for your deleted accounts, I golfed a byte off that answer. Do you mind me editing?
 
ais523
ais523
7:57 PM
I have no objections to people editing posts made by deleted users, whether or not they happen to be me
actually, part of the reason (but a very minor part) I deleted my account was in the hope that people would start seeing my work more as belonging to the community and be less afraid to edit it
anyway, given that I'm starting to participate more and more frequently again
I might consider creating a new account, but am unsure of the morality of repeatedly dropping 500-point bounties on random things
 
DJMcMayhem
DJMcMayhem
@ais523 Have you ever considered simply posting everything as a community wiki? That would accomplish both of your goals (not getting rep, freely editing)
 
Erik the Outgolfer
Erik the Outgolfer
yeah the bounties should have a point
 
ais523
ais523
perhaps I should just go up to 20k and delete the account again, but I'm not sure I could cope with all that much rep
@DJMcMayhem huh, that probably works actually
I'd need enough rep to be able to CW posts though
 
caird coinheringaahing
caird coinheringaahing
@ais523 There was a monthly underappreciated posts bounty, if you want to take that method
 
DJMcMayhem
DJMcMayhem
But no more
 
ais523
ais523
7:59 PM
where's the threshold for that? maybe I can get it from edits
 
caird coinheringaahing
caird coinheringaahing
You need 10 rep
 
ais523
ais523
(the problem with getting it from answers is that if I CW the answer I'll lose the rep from it and not be able to CW answers any more)
oh, that's 4½ edits, should be fairly easy
 
Pavel
Pavel
What is python's sys.maxint? I was under the impression that python had arbitrary precision integers.
 
ais523
ais523
@Pavel probably the largest integer storable in a system word, given what module it's in
 
Erik the Outgolfer
Erik the Outgolfer
@ais523 no, 5 edits
 
ais523
ais523
8:00 PM
I don't know for certain though
 
Mr. Xcoder
Mr. Xcoder
@ais523 10.
 
DJMcMayhem
DJMcMayhem
@Pavel It does, but after a certain point they're long integers
 
Mr. Xcoder
Mr. Xcoder
@EriktheOutgolfer You start at 1 ಠ_ಠ, not 0
 
caird coinheringaahing
caird coinheringaahing
@ais523 Or you take the association bonus
 
Anonymous
@Pavel In Python 2, it's INT_MAX (from C)
 
Anonymous
8:00 PM
It doesn't exist in Python 3
 
ETHproductions
ETHproductions
Or you could post an answer and convert it to community wiki after it gets an upvote (or do you need more rep to do that?)
 
Erik the Outgolfer
Erik the Outgolfer
@Mr.Xcoder well, how do you gain 9 rep starting from 1 rep to begin with?
 
Mr. Xcoder
Mr. Xcoder
4½ edits :P
 
DJMcMayhem
DJMcMayhem
5 edits and a downvote?
 
caird coinheringaahing
caird coinheringaahing
@EriktheOutgolfer 5 edits and downvote an answer
 
ais523
ais523
8:01 PM
you need 125 rep to downvote though
 
Mr. Xcoder
Mr. Xcoder
@DJMcMayhem DV at 125 ಠ__ಠ
 
ais523
ais523
it's easiest to get an odd rep boost from a question upvote
 
DJMcMayhem
DJMcMayhem
Yeah, then just cast 115 DV :P
 
ais523
ais523
you can't downvote at more than a 2:1 ratio
so you'd need 230 upvotes too
 
DJMcMayhem
DJMcMayhem
I was kidding
 
ais523
ais523
8:02 PM
that could take a while :-)
 
caird coinheringaahing
caird coinheringaahing
@ais523 Why?
 
DJMcMayhem
DJMcMayhem
You'd also lose DV priveleges
 
Erik the Outgolfer
Erik the Outgolfer
@DJMcMayhem remember you lose the privileges if your rep falls ;)
 
DJMcMayhem
DJMcMayhem
ninja'd
 
Erik the Outgolfer
Erik the Outgolfer
duh ninja
 
DJMcMayhem
DJMcMayhem
8:02 PM
hehe
 
ais523
ais523
@cairdcoinheringaahing something about stack exchange not liking negativity
 
ETHproductions
ETHproductions
Even maxing out your votes each day, that'd take 8 or 9 days, right?
 
ais523
ais523
also I think I got the ratio backwards
 
caird coinheringaahing
caird coinheringaahing
As amusing as this conversation is, you could simply use you puzzling account to take the association bonus, then you can edit and post CW's
 
ais523
ais523
and yes, optimal voting would be to upvote questions and downvote answers I think, and even then you can only get 50 votes per day if you cast them in the right order
 
Erik the Outgolfer
Erik the Outgolfer
8:04 PM
the problem is that, well, people will soon start to complain about "serial downvoting" and other such minor stuff but that's minor :p
also btw there's no practical difference between 10 and 11 rep
 
ais523
ais523
just make sure all the answers are by different users
 
Mr. Xcoder
Mr. Xcoder
... or you could just downvote what is downvote worthy
 
Erik the Outgolfer
Erik the Outgolfer
yeah that too there's always plenty of that stuff
 
ais523
ais523
it could be because I learned voting behaviour at Slashdot, but it took me ages to get the votecap badge
basically, I saved up questions I wanted to upvote until there were 50 of them
then upvoted them all on the same day
somehow I suspect this is not the intended effect of the badge
 
Erik the Outgolfer
Erik the Outgolfer
:p
 
DJMcMayhem
DJMcMayhem
8:08 PM
I've actually never gotten it
 
ais523
ais523
it's one of those badges that's easy to get if you want to and very unlikely to get by chance
 
Mr. Xcoder
Mr. Xcoder
I didn't get Vox Populi either
Although I wasn't allowed to vote anymore for like 3 days in the past, dunno why I didn't get it
 
ais523
ais523
I don't think you get vote restricted for being terrible at voting, so it must have been a consequence of hitting some sort of cap
 
Mr. Xcoder
Mr. Xcoder
Yes, I have hit vote cap and didn't get the badge
 
ais523
ais523
I'm going to give up trying to explain SE software because a) I can't and b) trying only makes me angry
hmm, if I do create a named account, what display name should I use? would user62131 increase or reduce confusion, for example?
 
DJMcMayhem
DJMcMayhem
8:13 PM
How about ais523?
 
Erik the Outgolfer
Erik the Outgolfer
why not just ais523
 
ais523
ais523
that's the other main option
 
ETHproductions
ETHproductions
ais62131
 
DJMcMayhem
DJMcMayhem
Or how about ais524?
 
ais523
ais523
ais523 is a username I generally use in programming topics
especially esolanging
 
Wheat Wizard
Wheat Wizard
8:15 PM
Does anyone know what is wrong with this function r=sum.map(read.(:[])).show?
 
FlipTack
FlipTack
jimmy523
2
 
Wheat Wizard
Wheat Wizard
I'm trying to make a short haskell function to sum the digits of a number
 
ais523
ais523
anyway, I should go to bed
no point making decisions when tired, it rarely works out well
 
Erik the Outgolfer
Erik the Outgolfer
good night
 
Wheat Wizard
Wheat Wizard
Adding r::Int->Int seems to work, but I really don't want to pay to add a type signature if I could not.
 
H.PWiz
H.PWiz
8:23 PM
@WheatWizard I remember having this problem before. But it works for me now. Also (:[]) can be pure.
 
Wheat Wizard
Wheat Wizard
@H.PWiz It works if you call it on a number, but not if you just declare it, by itself.
Now I'm wondering if answers that require being called to work are valid.
 
H.PWiz
H.PWiz
Oh... interesting I can define it in the repl
 
Wheat Wizard
Wheat Wizard
 
H.PWiz
H.PWiz
Best I have is plus 4 bytes for (+0) or (*1). I'd love to know what's wrong though
 
Wheat Wizard
Wheat Wizard
The problem is that the compiler can't figure out the type for the function, because show has multiple instances, once it sees it needs to be a number it figures out the type you want.
 
H.PWiz
H.PWiz
8:38 PM
@WheatWizard sneaky compiler flag?
 
Wheat Wizard
Wheat Wizard
That's longer than the other options
 
New Meta Posts
New Meta Posts
1
Q: Are functions that only work when called valid as answers?

Wheat WizardIn Haskell it is possible to define functions that will cause a compiler error unless they are called elsewhere in the program. For example the following code causes a compiler error r=sum.map(read.(:[])).show main=putStr"" Try it online! while the extremely similar r=sum.map(read.(:[])...

discussion
 
tfbninja
tfbninja
@DJMcMayhem My Question
 
New Main Posts
New Main Posts
0
Q: Save American Society!

tfbninjaStory You are an American spy, tasked with saving your country from the inevitable release of extremely sensitive documents being held a maximum security base, deep underground in the middle of the Pacific Ocean. If they are released to the public, society could collapse. You have been tasked wi...

code-golf string number arithmetic alphabet
 
tfbninja
tfbninja
Hey there it is
 
DJMcMayhem
DJMcMayhem
8:51 PM
Cool
I'm looking for that one Jelly Quick I was thinking of
 
Adám
Adám
@ConorO'Brien APL (Dyalog), 9 bytes: ⎕←⎕A,819⌶⎕A
 
tfbninja
tfbninja
@DJMcMayhem I just breezed through the Jelly docs..... wow
 
Adám
Adám
@StevenH. APL (Dyalog), 11 bytes: ⎕UCS 64+⍳58
 
dzaima
dzaima
@ConorO'Brien SOGL, 3 bytes: Zz+
 
Adám
Adám
CMC: Sum the digits of a number. (You may take input as string).
 
dzaima
dzaima
9:00 PM
@StevenH. SOGL, 5 bytes: ΖAzΝ∑. The last char can be removed if the characters can be on separate rows
 
caird coinheringaahing
caird coinheringaahing
@DJMcMayhem Do you mean ƭ (cycle through atoms)?
 
DJMcMayhem
DJMcMayhem
Yes (see my answer)
 
caird coinheringaahing
caird coinheringaahing
Yeah, just saw it
 
dzaima
dzaima
@Adám SOGL, 3 bytes - encode to base 10, sum that
 
caird coinheringaahing
caird coinheringaahing
Hmm, three answers deleted in 15 minutes doesn't suggest clarity in the challenge
 
DJMcMayhem
DJMcMayhem
9:05 PM
Even though I deleted my answer, I found a cool trick.
O%32 could be used in place of ŒlO_96 which is super convenient
@Adám Surprisingly terse in Brain-flak: 30 bytes ({[((((()()()){}){}){}){}]{}})
 
caird coinheringaahing
caird coinheringaahing
This is why edge cases such as spaces shouldn't be included in code golfs; my Jelly answer is 10 bytes longer because of it
 
Laikoni
Laikoni
@H.PWiz I get the same error when adding (+0) or (*1): Try it online!
 
H.PWiz
H.PWiz
@Laikoni at the end of the line
 
Laikoni
Laikoni
Oh right, the show is causing the problems.
 
Conor O'Brien
Conor O'Brien
9:20 PM
CMC: Reverse the digits of an integer with constant memory. (I have no idea if this is possible but I feel like it is)
 
DJMcMayhem
DJMcMayhem
@ConorO'Brien So technically, converting to a string would not be constant memory because the size of the string changes?
 
Conor O'Brien
Conor O'Brien
correct
 
H.PWiz
H.PWiz
@ConorO'Brien This?
 
Conor O'Brien
Conor O'Brien
I don't haskell >.>
but if that uses recursion, I'd think not, since that allocates memory on the call stack
 
H.PWiz
H.PWiz
I'll try testing it
 
Conor O'Brien
Conor O'Brien
9:26 PM
(which is proportional to the number of digits roughly speaking)
 
Laikoni
Laikoni
@ConorO'Brien With bounded 32-bit integers the memory can easily be constant. With unbounded integers I don't think it's possible.
 
Conor O'Brien
Conor O'Brien
@Laikoni I wouldn't say unbounded, just type independent
 
Laikoni
Laikoni
@ConorO'Brien Oh wait, do you mean by constant memory that no further memory is allocated apart from the initial memory for the integer?
 
Conor O'Brien
Conor O'Brien
@Laikoni I mean a constant amount of memory is allocated, independent of the input
 
Wheat Wizard
Wheat Wizard
You can potentially get constant memory including the input if the input is given in a stream.
 
H.PWiz
H.PWiz
9:29 PM
@ConorO'Brien Yes, memory is increasing with more digits
 
Conor O'Brien
Conor O'Brien
since unbounded integers can emulate integer lists, I wouldn't consider those since that's besides the problem
 
Wheat Wizard
Wheat Wizard
Well not for this particular problem but for some problems.
 
Conor O'Brien
Conor O'Brien
right, good idea, I was thinking from terms of a stream of digit characters, but I decided to generalize a bit
this would be helpful in many esoteric languages, all of which I see utilize linear memory for custom integer input, which becomes bothersome for further generalization for, say, brainfuck into higher level languages
 
Poke
Poke
why isn't the traditional answer correct for this
 
Steven H.
Steven H.
int out = input % 10; while (input /= 10) {out = 10*out+input%10;}? Pseudocode of course
 
Poke
Poke
9:31 PM
^
 
Conor O'Brien
Conor O'Brien
oh, neat
 
H.PWiz
H.PWiz
That was mine, minus the recursion instead of while
 
Poke
Poke
codegolf might be getting to you if that wasn't your immediate answer, haha
 
DJMcMayhem
DJMcMayhem
import math
def f(n):
    l = int(math.log10(n))
    new = 0
    for i in range(l + 1):
        new += int(n / (10**i) % 10) * (10 ** (l-i))

    return new

print(f(123))
@ConorO'Brien ^
It does make an integer, but ignoring arbitrary size integers, that should still be constant memory
 
Conor O'Brien
Conor O'Brien
@Poke I call it coding in nothing but BF and similar for a little over a week
 
Poke
Poke
9:35 PM
@ConorO'Brien yep, that would do it ;)
 
dzaima
dzaima
@DJMcMayhem length of a number is not constant memory
 
Conor O'Brien
Conor O'Brien
he's not allocating arbitrary memory tho, it's still only single integers
 
DJMcMayhem
DJMcMayhem
If it was in C it would be constant
 
Conor O'Brien
Conor O'Brien
(ignoring the range of course)
 
Steven H.
Steven H.
There's a true-constant-memory algorithm though
even for arbitrary sizes
 
Conor O'Brien
Conor O'Brien
9:37 PM
it's the equivalent of reversing a list but with digits
 
Poke
Poke
@ConorO'Brien it looks like python3 in which case range doesn't precompute a list
 
DJMcMayhem
DJMcMayhem
^
 
Conor O'Brien
Conor O'Brien
@Poke I don't know how python optimizes stuff but that makes sense. python2 needs xrange for that right?
 
Poke
Poke
mhm
 
DJMcMayhem
DJMcMayhem
@ConorO'Brien It's basically a generator rather than a list
 
Conor O'Brien
Conor O'Brien
9:39 PM
ah, I see
 
DJMcMayhem
DJMcMayhem
Do you know what a generator is?
 
Conor O'Brien
Conor O'Brien
yeah, they have those in JS and ruby
 
FlipTack
FlipTack
PSA: New tag stateful created (see meta), would really help if people could begin slowly retagging where applicable (but not so rapidly as to flood the front page)
 
Wheat Wizard
Wheat Wizard
@DJMcMayhem You know I thought I knew what generators were but it really didn't click until now. Perhaps I knew what they were but now I understand them.
 
DJMcMayhem
DJMcMayhem
Haha, well I'm glad I helped
@WheatWizard BTW, your current avatar is terrifying, as usual
@ConorO'Brien You know, {({}<>)<>}<> is arguably a valid brain-flak answer
 
FlipTack
FlipTack
9:47 PM
@cairdcoinheringaahing RIP all the effort we put in our controlled assessment, tasks were leaked online and Ofqual is planning to remove it from the overall mark.
"Exams regulator Ofqual plans to pull this chunk of the qualification from the overall marks as it has been seen by thousands of people."
 
Wheat Wizard
Wheat Wizard
@DJMcMayhem Thank you; I do my best.
 
Adám
Adám
@ConorO'Brien Does this count? APL (Dyalog), 9 bytes {⍞←⍺}/⍞,0 (prints to STDERR)
 
Steven H.
Steven H.
import math
def index(num, location):
    return (num // (10**location) % 10) # 0-based
def replace(num, location, digit)
    return ((num // 10 ** (location+1))*10+digit)*(10**location)+num%(10**location)
def f(n):
    l = int(math.log10(n))+1
    for i in range(l // 2):
        n = replace(replace(n,i,index(n,l-i),l-i,index(n,i))

    return n
True constant memory, happens in place
Works for arbitrary size integers
Not golfed but it's a PoC
 
Marcus Andrews
Marcus Andrews
Given a line of space-separated integers, is there a short ruby method for finding the product of that list?
 
ATaco
ATaco
Why the input method as a string?
 
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