Jelly Hypertraining

Erik the Outgolfer

11:16 AM

@HyperNeutrino Ready for another exercise? (ping when ready)

user165474

1:05 PM

@EriktheOutgolfer Ready :)

Erik the Outgolfer

OK, your first exercise is a square with side length N.

You can use any filler char.

user165474

Okay. Can I take it as an argument, or do I have to hardcode it?

Erik the Outgolfer

You can't hardcode it ofc ;)

user165474

lol Okay so I take the side length as and argument and the filler as an argument?

Erik the Outgolfer

Not that this makes it less trivial.

@HyperNeutrino No you don't take the filler as an argument, I thought you were talking about N.

user165474

1:09 PM

Oh. Whoops, I didn't word that question well. lol

user165474

Okay, so N is an argument and the filler is hardcoded?

Erik the Outgolfer

OK. Get to work!

user165474

:P

Erik the Outgolfer

Also, the square must not be an array of lines, it must be the string, like this for a 5x5:

#####
#####
#####
#####
#####

(using # here)

user165474

G	Attempt to format z as a grid.

user165474

1:10 PM

:)

Erik the Outgolfer

Wrong one, since that technically de-squarifies it.

user165474

Oh.

user165474

:(

user165474

Darn, I wanted to use ³ to get 100, but I need it for the argument :(((

Erik the Outgolfer

There is almost always a 2-byte way to do 100 rather than writing it verbatim.

user165474

1:13 PM

⁵²

user165474

Though I can use anything from [33, 99] for the same bytecount.

Erik the Outgolfer

No, that wouldn't always work as expected (you may need ⁵²¤). Also, you can't hardcode N.

user165474

Yeah, I know.

user165474

And oh, whoops. Then maybe I'll just write a number verbatim.

Erik the Outgolfer

No, there is a way that you'll not need ¤.

Just think a bit harder.

user165474

1:14 PM

Ah. Okay..

Erik the Outgolfer

I have made a 7-byte version.

user165474

Ah. Okay.

Erik the Outgolfer

And I feel like that's too much already.

Have you finished yet?

user165474

Nope.

Erik the Outgolfer

Get to work and ping me when you're done.

user165474

1:18 PM

Alright. I will.

Erik the Outgolfer

I have reduced to 6 bytes.

user165474

I feel like there's an atom or a quick that I haven't seen yet.

Erik the Outgolfer

Think of how we calculate the area of a square.

user165474

Uh, using the square (x**2)?

Erik the Outgolfer

No not that.

But something based on that.

user165474

1:25 PM

Does it have to do with multiplication? (x*x)

Erik the Outgolfer

Yep.

user165474

Ah.

Erik the Outgolfer

Want a hint?

user165474

Sure.

Erik the Outgolfer

It's multiplication, but not numeric multiplication.

user165474

1:27 PM

Oh hm.

user165474

Matrix multiplication...?

Erik the Outgolfer

No.

user165474

Okay.

user165474

Hold on, I'll be right back.

user165474

Is it the repeat list atom?

Erik the Outgolfer

1:35 PM

Yep.

Now you should be able to do the rest.

user165474

I have 0xxœs right now which gives me a matrix of 0s, but I can't format it in one byte.

Erik the Outgolfer

x isn't the repeat list atom, ẋ is.

user165474

Oh. Hm.

user165474

0ẋẋœs does the same thing, so I feel like my approach isn't correct.

user165474

0ẋWẋ

Erik the Outgolfer

1:39 PM

Yep, that's the first four bytes!

Hint: you don't need œs.

user165474

Ok.

user165474

@EriktheOutgolfer 0ẋWẋµY

Erik the Outgolfer

Congrats!

user165474

:D

user165474

Thanks!

Erik the Outgolfer

1:41 PM

Mine was 8ẋWẋ⁸Y

user165474

Ah. Interesting.

Erik the Outgolfer

8 looks fuller to my eyes than 0.

user165474

I see.

Erik the Outgolfer

It reminds me of a building block. I'd have used #, but it costs a byte.

user165474

Interesting.

user165474

1:44 PM

1 looks nice too.

Erik the Outgolfer

And 2 looks like noodles to me. Weird.

Ready for next exercise?

user165474

Yup!

user165474

2 looks like lasagna lol i'm weird

Erik the Outgolfer

Right-pointed isosceles right triangle with perpendicular side length N.

user165474

Example?

Erik the Outgolfer

1:47 PM

For N=3:

#
##
###
##
#

user165474

Ah. I see.

Erik the Outgolfer

Another example to clarify, for N=5:

#
##
###
####
#####
####
###
##
#

I chose right-pointed, isosceles and right-angled since it's easier to do.

user165474

Ah. Alright.

Erik the Outgolfer

Of course it doesn't appear as such when using rectangular fonts.

user165474

What do you mean by rectangular fonts?

Erik the Outgolfer

1:52 PM

Except for full-width chars (Asian languages mostly) a char isn't square-shaped, so squares appear as rectangles.

user165474

Ah. Yes.

Erik the Outgolfer

I have made a 5-byte version, can you do it? (Note: it's a bit tricky)

user165474

I'm trying to go off of RŒB.

Erik the Outgolfer

By slightly changing something, you can remove something else here.

user165474

RŒḄ?

user165474

1:55 PM

Wait ŒḄ works.

Erik the Outgolfer

That's what I meant, yeah.

user165474

Alright.

user165474

@EriktheOutgolfer ŒḄ8ẋY

Erik the Outgolfer

Exactly my solution!

user165474

:D

Erik the Outgolfer

1:57 PM

You can use 0 if you want.

user165474

Yes. I changed it to 8 because that way the code would match the TIO link :P

Erik the Outgolfer

Next challenge: A right-angled rectangle with side lengths N×M.

Take your square solution, and change one byte. That's all. Can't give more hints.

user165474

Ah. Alright.

Erik the Outgolfer

Found the byte?

Remember: your square solution is 0ẋWẋµY.

user165474

@EriktheOutgolfer 0xWẋµY

Erik the Outgolfer

2:05 PM

Congrats, although that wasn't the intended change. Mine was 8ẋWẋ⁹Y.

user165474

Ah, I see.

Erik the Outgolfer

Oh wait, there was no change needed at all. :/

user165474

Interesting.

user165474

Wait what

user165474

lol

user165474

2:05 PM

haha lol

user165474

yeah it technically needs two arguments but if we only have one it just repeats it

Erik the Outgolfer

It's just that I used ⁸ instead of µ...

user165474

Ah. I see.

Erik the Outgolfer

I have another exercise in mind.

user165474

Alright, do you have any more tasks?

user165474

2:08 PM

(ninja'd)

Erik the Outgolfer

ninja'd

user165474

hehe i ninja'd your ninja'd

user165474

ninjaception

Erik the Outgolfer

ninja'd again... true ninjaception

Anyways, here is it:

Square checkerboard with black top-left with side length N*2. Use any non-whitespace char for black, space for white.

N=4:

# # # #
 # # # #
# # # #
 # # # #
# # # #
 # # # #
# # # #
 # # # #

user165474

Ah, alright.

Erik the Outgolfer

2:11 PM

I said N*2 'cause N doesn't make any sense.

user165474

i see. Alright.

Erik the Outgolfer

@HyperNeutrino Also, trailing spaces not required, if that's of any help.

user165474

Oh alright. Thanks.

Erik the Outgolfer

And trailing newline allowed.

user165474

Alright. K might be useful.

Erik the Outgolfer

2:21 PM

Leading spaces required.

user165474

Yep. Otherwise it's not a checkerboard right :P

user165474

So 8xK gives me 8 8 8 8 for 4, now my idea is to figure out how to offset every other one.

Erik the Outgolfer

I dunno if K is of much help here though.

I've made a 10-byte version, looking forward to reduce.

user165474

Ah. Alright.

Erik the Outgolfer

Mine doesn't look very golfable...

user165474

2:29 PM

I have 8⁶Ḃị but I'm not sure how useful this link will be

Erik the Outgolfer

Isn't Ḃ for checking the parity of an integer?

No I don't think it's useful at all.

user165474

Yes. And no I don't think it's useful.

user165474

Welp I have class starting now, so I'll try to finish it today if I have time. Bye!

Erik the Outgolfer

Bye!

Erik the Outgolfer

2:45 PM

room topic changed to Jelly Hypertraining: Practice your Jelly :) To be a student, request access. Rules & Resources: gist.github.com/GolfingSuccess/2343b1996b4ea8384e41482a0f145b71 [class] [code-golf] [jelly] [practice]

The Resources list, along with some rules, has been moved to the room's description.

This way they will never vanish automatically.

Leaky Nun

3:06 PM

@EriktheOutgolfer =þ⁸ỊY

Erik the Outgolfer

Well, that's too non-trivial for the sake of my exercise though.

Leaky Nun

it took me quite a few minutes

Erik the Outgolfer

Yeah, and you are a "professional" Jelly golfer, so you know what that means :)

Leaky Nun

@EriktheOutgolfer how long is your solution?

Erik the Outgolfer

10

Now Hyper is in class though.

Leaky Nun

3:17 PM

mine is also 10

nah it's 9 now

@EriktheOutgolfer I'm guessing you forgot ⁾

Erik the Outgolfer

No it's 10 with the ⁾.

Leaky Nun

hmm...

you can still post a spoiler here

Erik the Outgolfer

According to the rules I made, yeah.

Spoiler Warning!

Leaky Nun

our solutions are completely different

Erik the Outgolfer

Yours is 10 bytes with the ⁾, right?

Leaky Nun

3:27 PM

no mine is 9 bytes

Erik the Outgolfer

Spoiler please?

Leaky Nun

Spoiler

it's 8 bytes now: spoiler

Erik the Outgolfer

Your 8-byte one is invalid, since, unlike normal checkerboards, this has a black top-left.

Leaky Nun

@EriktheOutgolfer you can always reverse the string

it's that easy

Erik the Outgolfer

Let's just keep things simple...

Leaky Nun

3:35 PM

Let's keep things short

@EriktheOutgolfer do you have another challenge?

Erik the Outgolfer

I'm currently thinking of one.

I thought of one: average(average(x),median(x)).

Leaky Nun

hmm...

testcase?

Erik the Outgolfer

Wait a sec.

[1, 3, 4, 6, 7] -> 4.1

Leaky Nun

should be unsorted

Erik the Outgolfer

The average is 4.2, the median is 4, the average of those two is 4.1.

@LeakyNun Sorting isn't implied, it just happened to be sorted.

Adding another testcase:

[7, 4, 1, 1, 2] -> 2.5

The average is 3, the median is 2, the average of them is 2.5.

Leaky Nun

3:42 PM

I don't know why, but 5H gives me a cache hit

I feel creepy

this is crappy

I apologize for my bad pun

Erik the Outgolfer

Maybe someone has ran 5H in the past, and it's been stored in TIO cache.

Leaky Nun

will your list have odd length?

Erik the Outgolfer

No not necessarily. I was thinking of a good testcase with even length and floats.

Leaky Nun

my solution atm is 15 bytes

which is 16 bytes too long

Erik the Outgolfer

[15.1,20,11,100,33,1.78] -> 23.848333333333333

Leaky Nun

3:47 PM

13 bytes now

how long is your solution?

Erik the Outgolfer

I haven't made one yet, I was making the testcases.

It seems that I made the exact same solution as you.

I got a cache hit...

Leaky Nun

wonderful

Now let's hash our solution using passwordsgenerator.net/sha512-hash-generator

6465A103D515415585833DF6B608EDD7000BE2138C1EAAC64AD8EA9CF69787B529797513EAD1AFBB‌86CD528936ED7234C16FBFF7AE79C3969D106B2B6B8871E1

Erik the Outgolfer

6465A103D515415585833DF6B608EDD7000BE2138C1EAAC64AD8EA9CF69787B529797513EAD1AFBB‌86CD528936ED7234C16FBFF7AE79C3969D106B2B6B8871E1

Lol exact same hash.

Leaky Nun

wonderful

Erik the Outgolfer

@HyperNeutrino Here is your challenge: Find the average and median of an unsorted list containing rational numbers, and then find their average.

Me and Leaky have done it in 13.

Leaky Nun

3:56 PM

hmm... smirks at rational number

Erik the Outgolfer

Rational = int or float. Just enough for a good exercise.

Leaky Nun

let's come up with another square challenge like the three challenges above

Given e.g. n=4, display:

#
 #
  #
   #

(trailing space and newline optional)

my solution is 7 bytes and is very non-trivial

Erik the Outgolfer

My solution is 7 bytes and is very trivial.

Leaky Nun

heh

Erik the Outgolfer

OK, let's add this up to the exercise queue.

Leaky Nun

4:01 PM

we can pin those

Erik the Outgolfer

Good idea.

Also, @-pings will be used when a challenge is directed towards specific students.

Leaky Nun

how do you even do it trivially in 7 bytes...

Erik the Outgolfer

@LeakyNun spoiler

Leaky Nun

oh... I used #

spoiler

Erik the Outgolfer

Trivial broad-audience challenge: Draw a line from top-left to bottom-right using a non-whitespace char. (credit @LeakyNun)

OK I pinned both.

Leaky Nun

4:06 PM

I can see that

Erik the Outgolfer

I say it because I've often experience blindness over the starboard.

@LeakyNun Ew that's too much!

Leaky Nun

kek

wait

if we can use custom characters...

4 bytes kek

Erik the Outgolfer

"a non-whitespace char" pretty much implies that the padding should be whitespace ;)

Otherwise there wouldn't be any such requirement.

Leaky Nun

but hey, that's a good way to create the identity matrix

@EriktheOutgolfer 6 bytes

Erik the Outgolfer

>_>

Leaky Nun

4:11 PM

:o

let's draw the diagonals

the input will be odd

@EriktheOutgolfer

Erik the Outgolfer

@LeakyNun What does that add over your existing challenge I pinned?

oh what did i say

What diagonals?

the two diagonals

Oh, like an X?

4:15 PM

#   #
 # #
  #
 # #
#   #

for n=5

My solution is 12 bytes

Erik the Outgolfer

I think we pressed "run" together.

No seriously.

Leaky Nun

lol

Erik the Outgolfer

spoiler for evidence

Leaky Nun

waaaaat

I thought you won't use my trick

well, too bad for you, my solution is 8-byte now @EriktheOutgolfer

spoiler

Erik the Outgolfer

So that's what that 5th byte is useful for!

Leaky Nun

4:27 PM

yes, that.

I believe we should post this on main

Erik the Outgolfer

I believe it would be a dupe or something.

Leaky Nun

47

Q: Do X without Y

Usually, it is said that "Doing X without Y" can be a trap to beginners writing challenges (source). However, I am cocky and think that I can definitely make an X without any Ys. Randomly. Oh yes, this will be good. Challenge: Given an odd integer n greater than or equal to 1, output an ex of si...