The Nineteenth Byte

Adam

03:03

thejonymyster

link pls :)c

Adam

codegolf.stackexchange.com/questions/59347/…, but it turns out someone already posted that same answer

PyGamer0

04:27

it seems that i can do that challenge in 1 byte

Sandbox Posts

08:03

0

A: Sandbox for Proposed Challenges

Solving an easy Sudoku in increasing order Tags: code-golfsudokunumbergridpuzzle-solver Introduction: I'm old-fashioned and still read a physical newspaper in the morning while eating my breakfast. Although I don't like Sudoku that much, I do solve the Light-complexity ones, which are extremely e...

emanresu A

10:25

How did NP miss this?

Sandbox Posts

10:43

0

A: Sandbox for Proposed Challenges

An even distribution number is a number such that if you select any of it's digits at random the probability of it being any particular value e.g. (0 or 6) is the same, \$\frac1{10}\$. A precise definition is given later on. For example \$\frac{137174210}{1111111111} =0.\overline{1234567890}\$ i...

PyGamer0

12:21

823

A: Cooling a cup of coffee with help of a spoon

I We did the experiment. (Early results indicate that dipping may win, though the final conclusion is uncertain.) $\mathrm{H_2O}$ ice bath canning jar thermometer pot of boiling water stop watch There were four trials, each lasting 10 minutes. Boiling water was poured into the canning jar, and...

thejonymyster

12:58

This thread was linked to from the xkcd What If? article Stirring Tea. This should be taken carefully into account when interpreting its various metrics (including viewcount and question and answer scores). The time series of the question and top-three answer scores are here, and here, here and here. — Emilio Pisanty May 28, 2020 at 8:15

I Now Know how to blockquote; thats a comment on the question itself

lyxal

you copy the comment link

thejonymyster

aha

that seems.... needlessly formal?

the comment i mean

ah well i guess im forgetting that other sites use votes in different ways :P

lyxal

the user seems to be a high-rep, high-influence (as in, well respected) member of the community. He's probably invested in making sure people take all things into account when viewing answers

user

It's like the HNQ effect

thejonymyster

yeah no it makes sense when you remember that rep actually matters on other sites lol

user

13:02

It's good to warn people of that

lyxal

it's weird to think that on other sites, I can't just blindly upvote 99% of posts

thejonymyster

right yea LOL

Unrelated String

crazy

lyxal

I sure would know something about that

given that I hold second place on most votes of all time :p

thejonymyster

first place is that votepilled guy i forget who

absolute voting chad

lyxal

13:05

gnat

101 1 2 4

thejonymyster

such low rep for such an opinionated guy

its disproportionately funny to me

Unrelated String

if he's ever felt the temptation to actually post here i wouldn't be surprised if at this point he'd use a sock for it :P

thejonymyster

how come :o

Unrelated String

for the sake of being that one guy who constantly votes and has never posted

it's a bit worth preserving

thejonymyster

ok yeah wow i had no idea they never posted

i love that they dont even have enough rep to downvote

mousetail

13:08

Most votes in general or specifically om CGSE?

thejonymyster

is there a way to check in general stats like that?

mousetail

Data explorer?

thejonymyster

the cartoon with the spanish kid?

no lol um is that a feature on the site? or should i google that term

lyxal

data.stackexchange.com

SEDE - Stack Exchange Data Explorer

thejonymyster

ty

doesnt seem like theres an obvious way to search the entire network?

mousetail

13:25

It's very powerful in some very specific areas but also very limited for other random things that seem they should be easy

user

You mean SQL in general or just how SEDE is structured?

mousetail

How SEDE is structured

SQL in general is fine

Adám

Nice and round:

thejonymyster

ooh, and the prime factorization is neat, 2^5*5^3*7^1

lyxal

@Adám Sorry what was that?

nice and round?

Adám

13:32

My CGCC rep.

lyxal

Doesn't look as round anymore.

thejonymyster

2 2 2 2 2 5 5 5 7... if prime factorization wasnt a whole thing that could make for a fun challenge idea lolol

oh nooo

Adám

That was shortlived. Just got the +10 rep notification now.

lyxal

I do a marginal amount of trolling :)

Adám

Hey, you should only upvote because an answer is good. Not for any other reason. Not even to spoil round rep counts.

thejonymyster

13:34

wow, now its 2*5*2801

(relatively) large prime number in there suddenly

lyxal

I think I'm a little past the point of just voting on good answers... I have 15.1k votes and counting

thejonymyster

i only upvote bad answers and i downvote good answers. im the bad actor from all of your hypotheticals.

mousetail

Might actually help them? People feel pitty that a god answer is downvoted and vote it towards what they view as a reasonable score. However, since upvotes are worth more rep you have ultimately helped them.

thejonymyster

conclusion: bad actors are necessary and very good for the ecosystem

lyxal

this is good for stack exchange - few understand

mousetail

13:37

It only works though if most people are neutral actors

If there are too many bad actors it becomes problematic

thejonymyster

neutral actors do nothing, youre thinking of anti-actors

they upvote downvoted answers and downvote upvoted answers

regardless of quality

mousetail

good actors actually follow the rules, upvote good answers downvote bad answers

thejonymyster

oh theres an entire world of nonsense if you follow this train of thought... will have to study further at some point

mousetail

neutral actors are effected by comments, how popular the post is, current score etc.

thejonymyster

crab actors downvote every post :P

mousetail

13:41

Because of carcinization every actor turns into crab over time

become cynical with age

user

13:59

I can confirm this, I turned into a crab last year

Or maybe it's just because I tried learning Rust then

mousetail

Rust is great

user

It is. It's also hard

mousetail

True

The borrow checker clicked for me on my 4th attempt at learning the language

9798

Q: What is the "-->" operator in C++?

After reading Hidden Features and Dark Corners of C++/STL on comp.lang.c++.moderated, I was completely surprised that the following snippet compiled and worked in both Visual Studio 2008 and G++ 4.4. Here's the code: #include <stdio.h> int main() { int x = 10; while (x --> 0) // x goes to...

Apperently 2nd most downvotes post

Adam

14:25

Last night I had an idea for a challenge, but I've forgotten it :/

TKirishima

14:43

@mousetail XDDDDDD

@Adam RIP

lyxal

@Adam this answer contains win

Unrelated String

so much

lyxal

one could say that it's snooping as usual

Adám

Ugh, these not-me user name highlights are annoying.

mousetail

Should have thought about that before being named Adam

lyxal

14:49

yeah, lack of foresight smh

thejonymyster

@mousetail so much shitposting in this thread lol

mousetail

This one is great:
while( 0 <-------------------- x )
{
   printf("%d ", x);
}

lyxal

I prefer my loops to be able to attack with strength:

int x = 10;
while( --x> 0 )
    printf("%d ", x);

> [it's the] armor-piercing arrow operator: --x> (note those sharp barbs on the arrow tip). It adds +1 to armor piercing, so it finishes the loop 1 iteration faster than regular arrow operator.

mousetail

Why not both:
while(0<--x-->0)

lyxal

no way you be dual wielding

thejonymyster

15:04

can someone explain why my code isnt working? i used armor piercing spiky arrows but its so slow: while(++x>0)

lyxal

Well obviously that isn't going to work

TKirishima

@mousetail Yep :p

lyxal

++> doesn't look like an arrow now does it

Sure it might from an abstract level, but C++ compilers from the 1900s were written with black and white arrows in mind

@thejonymyster They weren't expecting kids like you to go wild with arrow line choices

thejonymyster

those are its spikes

lyxal

The compiler is looking through the source trying to find an arrow

thejonymyster

15:07

thats so funny honestly

arrowlang when

well theres that one thats just arrows in 2d

lyxal

@thejonymyster yeah, but the compiler's pathfinding isn't optimised for spikes

thejonymyster

s/one/so many/

lyxal

The compiler only knows to find normal arrows

Normal arrows with recognised buffs

Using ++x> as your arrow is like challenging someone to a fight but then making them climb 50 floors to then fight on a bouncy castle while smooth jazz mixed with 21st century meme sound effects plays

Sure, it's a valid way to fight,but no one is gonna know what the hell you're doing

++x> is the equivalent of the rooftop battle to the C++ compiler you see.

thejonymyster

C++x>

DLosc

@thejonymyster You've got too many spikes, they're interfering with the arrowdynamics. Try while(+--x>0) instead.

lyxal

15:13

@thejonymyster That's like making it so that the radio station sourcing the jazz changes every 6.392 milliseconds and every time it changes you have to go through 200 years of unskippable ads

@DLosc see this is an arrow with recognisable buffs.

The compiler can easily find and follow that arrow

The guys who made gcc were expecting things like that. They weren't expecting broken arrowdynamica

Adam

Instead of arrows, I thought these were all pointers

lyxal

No no those are the asterisks and the short arrows

The asterisks introduce their own pathfinding problems that interfere with normal physics. These problems are outside the scope of other arrows

An example is that the asterisks can sometimes lead to a black hole of void that leads you to a underground hybrid prison/mall on the other side of the country

Adam

On a completely unrelated note, I have an idea for a CMC: Determine if a number has its digits in lexicographic order (e.g. return true for "1357", "88" and "0", false for "523" and "121")

PyGamer0

@Adám does it ping you?

lyxal

@Adam vyxal, 2 bytes: Try it Online!

DLosc

15:18

@lyxal Fortunately, you can solve these pathfinding problems with an A* algorithm

5

Adám

@PyGamer0 No, but it does highlight.

PyGamer0

in flax, Jul 24 at 15:57, by PyGamer0

feebdcakc?

Adam

@lyxal I changed the spec so "88" should be true as well

PyGamer0

@DLosc ^^

lyxal

@DLosc touche. You've won :p

Adám

15:20

I should be able to write a userscript that turns off highlighting unless my accent is present.

lyxal

@Adam vyxal, still 2 bytes: Try it Online!

Because there's still a built-in for that!

Adam

Of course there is

lyxal

There's also one for reverse sorted and unsorted

So don't bother with those if you don't want a 2 byter :p

Adam

I mean, there's a reason I posted it here and not in the sandbox lol

DLosc

@Adam Pip, 4 bytes: $<=a

~~Or 3 bytes if I can swap truthy and falsey: $>a~~ Nope, nevermind, that doesn't work

3 bytes if 88 counts as false, though: $<a

Adám

15:26

javascript CMC: On any DOM change, remove mention class from all <span class="mention">@Adam</span>s

DLosc

Wow, bold-tags

Didn't know that was a thing

Adam

[bold-tag:javascript] CMC: On any DOM change, remove mention class from all <span class="mention">@Adám</span>s

pxeger

**[tag:bold-tags]** -> bold-tags

5

Adám

@Adam Stop ping-spamming me!

Adam

:(

pxeger

15:33

→ 2 messages moved to Sandbox

Adam

Does each edit cause a new ping? That's some not great design

Adám

It is necessary to notify the recipient of the new content.

thejonymyster

CMC: given a string, output it formatted as a tag

or should that be bold tag to be topical? lol

DLosc

@thejonymyster As in, "[tag:" + s + "]"?

thejonymyster

no spaces in tags as well, so kebab

DLosc

15:45

Ah, okay

What if there's a ] in the string? :P

thejonymyster

then i'll eat my hat

VTC as unclear :P

needed more time in the CMSandbox

not related to any of that but wasnt there an ais523 lang where it's TC if you have arbitrarily precise angles?

or i guess would i ask that in tarpit?

yeah ill move

graffe

I was just told about this job interview question. Each road in a road network has a random time to go from one end to the other. This is a normal distribution with some mean and distribution. If you are told the time to go between lots of different points in the network, how can you estimate all these different means and standard deviations?

CMQ ^^^

pxeger

16:04

"some mean and distribution" - I assume you mean "some mean and standard deviation"

and what do you mean by all these different means?

why is there more than one mean/stdev?

Adám

CMC: Given a string, convert it to an XML tag with itself as content, e.g. abc → <abc>abc</abc>

DLosc

@Adám Pip, 13 bytes: "<0>0</0>"R0a

Adám

CMC: As above, but now also with itself as an attribute and its value: abc → <abc abc="abc">abc</abc>

Sandbox Posts

16:25

0

A: Sandbox for Proposed Challenges

Implement Bloom filter insertion A Bloom filter is a probabilistic data structure that is used to determine whether an element is in a set in a fixed number of bits. It consists of: a bit array \$B\$ of fixed size \$m\$, initialized as all \$0\$s, and \$k\$ different hash functions \$h_1,\ldots,...

Adam

(I remembered the question idea)

graffe

16:49

@pxeger yes sorry

@pxeger there is one per edge

I mean each edge has a possibly different mean and standard deviation

Adam

I mean, if you have enough data, for each edge from A to B, you can just filter for the times of travel between A and B

Adam

17:05

This is some speculation, but if we let T_{A,B} be a random variable for the traversal time on the edge between adjacent nodes A and B, then for each pair of nodes C and D we can define a new random variable T_{C,D} which is the weighted average of the sums of all paths between C and D (which will also be normally distributed), then use log likelihood minimization to find the most probable values for the means/standard deviations?

*maximum likelihood estimation

Steffan

17:46

@Adám Vyxal, 15 bytes: `<Π Π="Π">Π</Π>

Adám

That's very impressive.

Managed to golf my Extended Dyalog APL down to 14: ⎕XML(≢,⍮,⊂⍤⍮)⍨ Try it online!

user

19:05

@Adám Kotlin, 30 bytes: {"<$it $it=\"$it\">$it</$it>"}. Not particularly clever but I like it

thejonymyster

19:44

CMC: given a string of 0s, 1s, and 2s, replace 0s and 2s with 012, and replace 1s with 210.

i have no idea how to do this sort of thing in slashes :P ^ but i wont make you do it

DLosc

19:59

@Adám This gets more interesting because Pip can't put double quotes in regular strings. Looks like the shortest way is to use escaped strings but not to use their variable interpolation feature: \"<0 0="0">0</0>\"R0a (21 bytes).

Using interpolation, it's 23 bytes: \"<\a \a="\a">\a</\a>\"

DLosc

20:12

@thejonymyster Pip, 11 bytes: CHRF012@:^a

@Adám funstack.hs, 90 bytes: Concat Cons '<' compose Concat Cons '>' compose Concat "</" Concat flip ">" hook hook hook

(very very work-in-progress)

thejonymyster

20:31

@DLosc ooh :-) where do the tokens split here?

DLosc

CH RF 012 @ : ^ a

Reflect 012 so it becomes 012210; chop it into two halves; index into that list with each digit of the input (cyclical indexing).

The result is a list, but by default it's concatenated together to be output.

... which, now that I think of it, means I can golf a byte: CHRF,3@:^a

emanresu A

21:44

@pxeger italic-tags bold-italic-tags

~~strikethrough-tags~~

Wheat Wizard

[tag:tag-tags]

darn.

thejonymyster

@DLosc wow!

emanresu A

[link-tags?](youtube.com/watch?v=dQw4w9WgXcQ)

Nope

emanresu A

22:45

CMC: Previous row of pascal's triangle

emanresu A

23:01

> Consider upvoting this challenge if you enjoy solving it

Source

Aiden Chow

23:25

Desmos, 28 bytes:
k=l[2]-1
f(l)=nCr(k,[0...k])

Try It On Desmos!

Transcript for