The Nineteenth Byte

Erik the Outgolfer

11:04

@LeakyNun 05AB1E, 8 bytes: [>Dfθ4‹#

(yay 1-byte factor builtin)

Leaky Nun

CMC:

||||||||~|||||||||~|||||||||~|||||||||~|||||||||~|||||||||~|
|||~||||~||||~||||~||||~||||~||||~||||~||||~||||~||||~||||~|
||||||||~|||||||||~|||||||||~|||||||||~|||||||||~|||||||||~|
|||~||||~||||~||||~||||~||||~||||~||||~||||~||||~||||~||||~|
~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|~|
|||~||||~||||~||||~||||~||||~||||~||||~||||~||||~||||~||||~|
||||||||~|||||||||~|||||||||~|||||||||~|||||||||~|||||||||~|
|||~||||~||||~||||~||||~||||~||||~||||~||||~||||~||||~||||~|
||||||||~|||||||||~|||||||||~|||||||||~|||||||||~|||||||||~|

source:

I've drawn a curious pattern ... rextester.com/WXZV81312 — sergiol 2 days ago

Erik the Outgolfer

Tcl, 125 bytes:

while {[incr j]<21} {set i 1;while {[incr i]<62} {if {[expr ($j*$i)%10]} {append s |} else {append s ~}};append s \n}
puts $s

well, yeah

at least I think charcoal would outgolf that by a lot...

Leaky Nun

@EriktheOutgolfer try to do it in Jelly

Erik the Outgolfer

hmm...basically I can use some ṃ or something

Leaky Nun

I still have 0 idea how it is generated

Erik the Outgolfer

11:14

I have 0 idea of tcl whatsoever

:P

Leaky Nun

well you can see ($j*$i)%10

Erik the Outgolfer

I do

Leaky Nun

and you can see 21 and 62, so you can pretty much figure it out

Erik the Outgolfer

dilemma: tcl approach or ṃ approach?

let's try both

Leaky Nun

16 bytes @EriktheOutgolfer

Erik the Outgolfer

11:18

wait a sec I'm organizing some stuff

ok did it in 21 now reducing to <16 if possible

17 18

back to 17

@LeakyNun close to your approach

but I can golf yours to 15

specifically, this is the golf I'm talking about

this was the approach of mine...seems I'm not that good at porting :p

Leaky Nun

12:12

@EriktheOutgolfer nice

Lembik

more downvotes!

wow

I may resign from ppcg :)

Leaky Nun

@Lembik downvotes happen. move on.

Lembik

@LeakyNun but really quite a lot for what I think is a nice programming challenge

Leaky Nun

-9

Q: Are my eyes open or closed?

You are trying to guess my emotion. I will give you an adjective, as the input to the function/program. Your task is to output the state of my eyes, either O_O for open, or ._. for closed. Details For these adjectives, you must output open eyes O_O animated breezy brisk driving enterprising ...

code-golf

Lembik

4 downvotes!

oh maybe more

Leaky Nun

12:20

65

Q: Print a 10 by 10 grid of asterisks

Background This is a standard textbook example to demonstrate for loops. This is one of the first programs I learnt when I started learning programming ~10 years ago. Task You are to print this exact text: ********** ********** ********** ********** ********** ********** ********** *********...

code-golf kolmogorov-complexity

@Lembik this is my most upvoted challenge

It breaks down to +74/-9

Lembik

what can I say :)

Erik the Outgolfer

that's unfortunate

leaky has definitely more interesting challenges than that one

Lembik

my most upvoted challenge codegolf.stackexchange.com/questions/26323/…

totallyhuman

12:41

My current most upvoted challenge has 4 close votes ;-;

Leaky Nun

@totallyhuman hmm... lemme cast one more ;p

totallyhuman

:P wouldn't be surprising

Leaky Nun

nah, not in the mood to clear the votes

(if I hammer it and then reopen it, all the votes would be gone)

totallyhuman

Mm

Jul 10 at 15:10, by totallyhuman

seriously hammers are weird

Anyways I have to wait 8 days for the votes to expire

Assuming nobody else votes to close

Poke

13:18

i still agree with my close vote on that challenge

sorry bub

totallyhuman

Mm s'fine I expected close votes

The hammers threw me off though o0

Besides I got a whole 142 rep and a couple of badges from it so...

Phoenix

CMC: Out of a given positive int array, extract every element greater than those adjacent to it, e.g. [4,2,6,7,4,5,4,3] yields [4,7,5]

Leaky Nun

@Phoenix nice

can I not output 4?

Phoenix

Huh? There's a 4 in the example output.

Leaky Nun

I mean, it's an edge case

Phoenix

13:30

oic.

No, effectively edges are surrounded by 0s

Anonymous

@Phoenix So the first and last element should always be printed?

totallyhuman

> edge case

Hehe

Leaky Nun

@Mego no.

Anonymous

It seems like having a virtual element at the beginning and end equal to the first and last element would be a better choice

Phoenix

@Mego No, the last element in the test case is smaller than the second to last element.

There may be a virtual 0 to its right, but that's not both surrounding elements.

Anonymous

13:31

Oh, I read it as greater than at least one, not both

Anonymous

Python, 85: lambda b:lambda a=[0]+b+[0]:[a[i]for i in range(len(a))if a[i]>a[i-1]and a[i]>a[i+1]]

Leaky Nun

@Phoenix Jelly, 13 bytes: 0;;0»3\f"⁸¹Ðf

remove the last 4 bytes for uglier output

Phoenix

@Mego Would lambda b,a: not work?

Leaky Nun

@Phoenix it wouldn't work, because it is actually lambda b,a=[0]+b+[0]: which references b

Anonymous

Uses the oft-overlooked output format of returning a function that returns the result

Anonymous

13:35

@Phoenix Nope, because function arg defaults can't refer to other args in the same function

Anonymous

There's probably a better way that's less hacky

Phoenix

Ah

Business Cat

@Phoenix CJam, 23 bytes: {T\T++3ew{(+(f<:&},1f=}

Anonymous

There's also a bug in that program

Anonymous

Fixed for 89: lambda b:lambda a=[0]+b+[0]:[a[i]for i in range(1,len(a)+1)if a[i]>a[i-1]and a[i]>a[i+1]]

Phoenix

13:37

@LeakyNun The thing with the ugly output form is that it doesn't work great with 2-digit numbers. Could you just split the list by newlines or something, to or any other way to delimit in less than 4 bytes?

Anonymous

Less hacky for 80: lambda a:[a[i]for i in range(len(a))if a[i:i+1]>a[i-1:i]and a[i:i+1]>a[i+1:i+2]]

Leaky Nun

@Phoenix it is actually valid

(if you know Jelly :p)

ok, I can do it in 2 bytes

well, change the last three bytes to Y

Phoenix

That's pretty ugly but acceptable.

Leaky Nun

thanks :p

@Phoenix Jelly, 11 bytes: 0;;0»3\=⁸⁸x

Phoenix

DYK that C# has SQL in it? From an example given on the "Using LINQ in C#" page of the docs:

var CustomersQuery = from customers in northwindSampleDataContext1.Customers
                      where customers.Country == "US"
                      select customers;

totallyhuman

13:44

NIDK

Phoenix

That's kinda cool.

totallyhuman

It's my mission to reply to any messages with "DYK" in it with "NIDK"

Mayube

@totallyhuman case sensitive?

totallyhuman

Based on context

LiefdeWen

@Phoenix you can do that on most collections so it does C# to it but if you use it on a Queryable it generates actual SQL.

Mayube

13:47

interesting

Phoenix

Yep, and you can interface with actual SQL databases, as well.

Mayube

numpy's where function seems to return an empty list if the 2d array you pass it doesn't have equal width

betseg

anyone here knows arimaa?

Mayube

@Phoenix you can also do LINQ in the more commonly accepted format

LiefdeWen

yeah EntityFramework and Dapper are the two most popular libraries that do that, so getting data from your data store is as easy as

var users = db.Users.ToList();

Phoenix

13:48

@Mayube IK, it's quite good for golfing.

I had no idea about the SQL thing unitil actually looking up LINQ in the docs.

Mayube

var CustomersQuery = northwindSampleDataContext1.Customers.Where((x)=>x.Country=="US");

LiefdeWen

@Mayube Yeah but when joins come up the query structure is WAYYY neater.

Leaky Nun

@Phoenix I'm still figuring out how the hell I would do it in R

Phoenix

@Mayube you can golf that with x=> instead of (x)=>

LiefdeWen

What's interesting in that example @Mayube gave is that the type of CustomerQuery is Queryable, which means it still hasn't executed against the db.

Mayube

13:50

@Phoenix I wasn't trying to be golfy

Anonymous

Using the fluent interface for LINQ allows you to do consumer functions, unlike the LINQ expressions.

Mayube

@LiefdeWen CustomersQuery would be an IEnumerable<Customer>

Anonymous

AFAIK you can't do something like someQueryable.Select(x => x.Foo).ForAll(x => Console.WriteLine(x)) with a LINQ statement.

LiefdeWen

@Mayube northwindSampleDataContext1 tells me that they are using probably EntityFramework which then wouldn't make it an IEnumerable

Phoenix

@Mego How would you do that with the fluent interface?

Anonymous

13:52

@Phoenix That is the fluent interface

Phoenix

Ah

I see.

Mayube

@Mego I think it's ForEach not ForAll

Anonymous

A fluent interface means that expressions can be chained off of one another like that

Anonymous

@Mayube ForEach is a List method. ForAll is a PLINQ method.

Phoenix

PLINQ?

Anonymous

13:54

To use ForEach, you'd need blahblah.ToList().ForEach(stuff)

Anonymous

@Phoenix Parallel LINQ

Mayube

/shrug I only ever use LINQ on Lists and the like

Phoenix

Ah

I only use LINQ when ReSharper autoconverts a foreach loop I wrote to a linq expression.

LiefdeWen

@Phoenix lol and then the internal compiler makes it a foreach again

Phoenix

I think the internal compiler makes it a for

Anonymous

13:55

List.ForEach requires the collection to be consumed and stored in a List first via ToList, which is undesirable for large collections. ForAll does things in parallel, but doesn't consume the entire list, so it uses less memory.

totallyhuman

Considering there's a limit to how many values OEIS holds

Would my oeis library be valid?

Anonymous

@totallyhuman Valid? Yes. Useful? Less so.

totallyhuman

For golfing

Anonymous

Also you should override __getitem__ and __contains__ for extra golfiness

totallyhuman

I did..?

Anonymous

13:59

Oh I'm blind

Anonymous

I should probably sleep at some point

totallyhuman

I have both

I'm screwing around with good practise :P

Anonymous

You fetch from the sequence members list a lot - you should cache that so you only need to download it once

totallyhuman

Mm yeah

Good point

Maybe I should just construct one list

I thought it might be too big to be efficient but...

Anonymous

Also I'd write return (int(value.split()[1]) for value in values.split('\n')) as for value in values.split('\n')): yield int(value.split()[1])

Anonymous

14:02

@totallyhuman You're having to pay for that memory anyway when you fetch the data, so you might as well hold on to it

totallyhuman

Fair enough

Plus it would clear my code up a lot too

Wait did I just turn tnb into code review D:

dzaima

any feedback on this sandbox post?

Phoenix

14:17

@dzaima It seems good. What you're asking for is tricky to specify properly, but you did it well, and the test cases cover everything I could think of.

dzaima

@Phoenix So you'd say it's ready to get posted?

Phoenix

Ye

Business Cat

Couple things I would say: 1) Is it strictly integers? 2) You say negatives aren't possible, but is 0? If so, you should make a test case with 0

dzaima

@BusinessCat Thought I mentioned that, thanks.

Business Cat

Other than that, seems fine

TheLethalCoder

14:19

Do my comments on this answer make sense. Could I have worded it any better to the OP?

Poke

@TheLethalCoder i think you were being reasonable

dzaima

@BusinessCat does the edit cover what you mentioned?

TheLethalCoder

@Poke Guess I'll take the good old stack exchange philosophy and move on then :)

Business Cat

@dzaima I think the last test case should be 84? Isn't 2+0 * 42 == (2+0)*42?

Or am I misunderstanding

dzaima

@BusinessCat yep..

fixed. Apparently I can't do 2+0...

Adám

14:31

@dzaima In other words (word? letter?): I.

Bruce Forte

hey guys.

totallyhuman

hi

Phoenix

\o

Business Cat

@Adám It'd be pretty funny if you could just eval the expressions in I and they worked...

Bruce Forte

I'm not getting any feedback on a post in the sandbox on this.. is it too long?

dzaima

14:33

@Adám that exists? Doesn't surprise me too much actually.

Adám

@BusinessCat I think you pretty much can.

@dzaima My colleague, Marshall, wrote it.

Phoenix

@Adám Given I is on TIO, could you show us an example?

IDK how to print things in I.

dzaima

does the parsing tag fit the question?

Phoenix

Yes

dzaima

k, posting

Cows quack

14:37

@Adám it's amusing how 3/4 of the stars are by PPCG users

Adám

@Phoenix Try it online!

@Phoenix Printing is implicit.

dzaima

@Adám doesn't seem to follow the regular order of operations, trough.

Poke

^ this

Cows quack

it goes left to right

dzaima

^ noticed that

Cows quack

14:42

2+0=2, 2*42=84

Adám

@dzaima Ah, now I actually read your post. As CQ says, I is strictly left to right, but spaces dictate.

totallyhuman

@Cowsquack and the other one is the creator themselves ><

New Main Posts

0

Q: Logical Order of Operations

Task Given an input, evaluate it as a mathematical equation following the order of operations. But, instead of the using PEMDAS, we drop the parentheses and exponentiation and introduce spaces - SMDAS - spaces, then multiplication & division, then addition & subtraction. How does that work? E...

code-golf math parsing

Adám

@Cowsquack I don't understand.

Cows quack

3 of the 4 stars on the github repo were by PPCG users

Adám

14:53

@Cowsquack TIL about GitHub stars.

Wheat Wizard

15:09

Is there a way to assign a variable in python without an =?

totallyhuman

Uhh why?

But you might be able to modify the globals dict

Poke

@WheatWizard buffer overflow?

Wheat Wizard

Oh jeez

totallyhuman

15:25

github.com/totallyhuman/py-oeis/commit/…

New Main Posts

0

Q: ASCII reflections in a box

ASCII reflections in a box You probably all know the Law of Reflection, in this challenge you'll visualize the trajectory of a ball in a box. Related: ASCII Ball in Box Animation and ASCII Doodling: Laser in a Box Task You're given three integer pairs W,H, x,y and dx,dy - the first represents...

code-golf ascii-art

PhiNotPi

I just came across this challenge from last year (somehow I must have missed it):

36

Q: Quixels - Quantum Pixels

Introduction A quixel is a quantum pixel. Similar to a classical pixel, it is represented with 3 integer values (Red, Green, Blue). However, quixels are in a super position of these 3 states instead of a combination. This super position only lasts until the quixel is observed at which point it c...

code-golf graphical-output random image-processing

(I was looking for any posts I could answer with quantum computing.)

I guess I would have to say, if I made this challenge, I would have used something other than RGB, and the resulting images probably would have looked a lot nicer.

In fact, I'm kinda curious what the best colors combinations would have been, this kinda reminds me of dithering algorithms too.

Leaky Nun

15:44

@Phoenix R, 76 bytes: [function(a)a[a==apply(matrix(c(0,a,0)[outer(0:2,1:length(a),"+")],3),2,max)]]‌(tio.run/##DYs7CoAwEAWvIla7@IT4h6AnEYtFjAoaJUTQ08cUUwzMuGCSPg/…)

RIP markdown

Downgoat

wait what python does not have async networking O_____O

@Cowsquack 1) is there GH issue 2) your username...

Cows quack

@Downgoat oh wait, there already is an issue

github.com/vihanb/PPCG-Design/issues/125

Downgoat

can you also please explain username :P O_o

Cows quack

so many people have already asked about the username change >_>

DJMcMayhem

@Cowsquack Every time I look at your username, I think Cow Squack instead of Cows Quack

Downgoat

15:59

I thought cows moo please help brain is breaking

totallyhuman

but wait

goats don't moo?

Cows quack

@DJMcMayhem you're not the only one: chat.stackexchange.com/transcript/240?m=38749954#38749954

@Downgoat see here (large onebox)

Downgoat

@totallyhuman ಠ_ಠ goats bleet or baa

totallyhuman

then what do ducks do O____O

Downgoat

@totallyhuman quack?

3

that's why ducks are called quackers

totallyhuman

16:03

wat

Business Cat

But what do sh**p do?

Cows quack

there is also a MarioKart Wii vehicle called the Quacker and it resembles a duck

Mayube

Cool, basics of LMBM work now, can do a rough hello world program :D

Cows quack

LMBM = pLuMBuM? :P

Mayube

LMBM = Lean Mean Bean Machine

2d language based on this challenge

Wheat Wizard

16:12

@DJMcMayhem Tell me when you post your CNR, I've been thinking about it and I'm really excited for it now.

New Main Posts

0

Q: Put together a Senate majority

There are one hundred members of the United States Senate. Assuming that nobody filibusters and that the Vice President isn't cooperating, at least fifty-one members are necessary to pass a bill. But some members work together better than others, entropy-wise. Your task: Output the last names of...

code-golf komolgorov-complexity

Mayube

interesting, random.randint(0, 1) seems to favour 0, but random.choice([0, 1]) seems to be much more uniform

HyperNeutrino

Hm. Not for me.

Sample size 1 million:

499375 : 500625

(0:1)

With random.choice it is a bit more uniform

500082 : 499918

The only largely significant difference I noticed though is that random.choice seems to be a lot faster :P

Mayube

I didn't run as many tests, but using the following code in LMBM, I got A 18 times out of 100, wheras I didn't get D once, while with choice both were around 12 out of 100

   O
   ^
  ^ ^
 ^ ^ ^
" " " "
A B C D
U U U U

3 [0, 1] choices are made

all 0's leads to A, all 1's leads to D

HyperNeutrino

hm ok

Mayube

16:24

ah well, I'll just stick to using choice

HyperNeutrino

sure :P it's more uniform for me, and faster for you, so I guess that's the better choice :P

What if you do random.random() < 0.5?

DJMcMayhem

@WheatWizard Oh cool, I'm glad you think that! I'll make sure to ping you once I post it, but I feel like it's got some work to do. I'd like to make sure it's as polished/ready as possible when I post it.

Do you have any thoughts on room for improvement?

Business Cat

Link?

DJMcMayhem

2

A: Sandbox for Proposed Challenges

Make your language mostly unusable cops-and-robbers arithmetic Inspired by this comment... In this challenge, you are tasked with running some code that makes it so that your language no longer satisfies our criteria of being a programming language. In that challenge, that means making it so...

Dennis had some thoughts here

Leaky Nun

@Mayube actually they use the same random()

totallyhuman

16:31

> the number to find after the number

i suck at documentation

Leaky Nun

(cc @HyperNeutrino)

Riker

@Downgoat trying to get github to use a custom domain name

and afaict I do need one yes

I think I've got it now though

Phoenix

16:50

In C(++), is there a better way of determining the value pointed to by an int* i than i[0]? I feel like there should be, but I don't know what it is.

Leaky Nun

@Phoenix define better

Phoenix

i[0] suggests i is an array, when it isn't.

Leaky Nun

try *i?

Phoenix

TY

(I am C noob)

Leaky Nun

a[b] is syntactic sugar for *((a)+(b))

(which makes i[0] equivalent to 0[i])

Phoenix

16:53

I've always wondered how that made sense!

Business Cat

Wouldn't it be *((a)+(b*(size of whatever the array is holding)))

Leaky Nun

@BusinessCat pointer arithmetic already does that for you

Business Cat

Or am I mis-remembering

Alright

Leaky Nun

@BusinessCat see this

#include <stdio.h>
int main(int a){
	int b[10];
	printf("%d\n",b);
	printf("%d\n",b+1);
	printf("%d\n",b+2);
	printf("%d\n",b+3);
}

(the first output is random, the else is the previous one add 4)

Cows quack

then what goes in 1229849905?

Leaky Nun

16:55

@Cowsquack the second byte of the int

one int is 4 bytes

Cows quack

I have int loc=b; does that mean loc contains the location of b?

Leaky Nun

what is b?

Cows quack

Then why does printing *b work while *loc borks?

@LeakyNun the array

Business Cat

Because int b[10] is actually an integer point but loc as just an integer

Transcript for