The Nineteenth Byte

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Zacharý

01:01

Oh yeah, it's that time of year.

New Main Posts

Q: Print the Lost numbers

As a big fan of the Lost TV series, I always got intrigued by the sequence of numbers that repetitively appears on the episodes. These numbers are: \$ 4, 8, 15, 16, 23, 42\$ (A104101) Using any programming language, write a code that outputs these numbers. Scoring: Shortest answer wins The o...

2 hours later…

Anonymous

02:53

@flawr I wrote a 58-byte solution. I bet it can be optimized.

New Meta Posts

05:12

Q: It seems the consensus on Scratch is to use scratchblocks2 syntax, but what about "when green flag clicked"?

In many code-golf Scratch submissions, I see when green flag clicked used, when when gf clicked is also valid in scratchblocks2. Is there a reason for this, or is it just because people submit raw conversions?

discussion code-golf

3 hours later…

New Sandboxed Posts

08:21

A: Sandbox for Proposed Challenges

Worded Calculator I saw a similar challenge somewhere but I can't find it anymore. Task Write a program that takes a string as input and outputs the result of the expression. Rules The input string will be worded and not numeral. There will be no parentheses. Order of calculation will be d...

flawr

08:52

@Mego I haven't even finished writing the challenge!!! :)

7 hours later…

New Main Posts

15:41

Q: Determine the Widest Valley

Imagine we get a slice of some mountainous region, this would result in a shape similar to this: 4 _ 3 _ _ __/ \ 2 / \__/ \ _/ \_ / 1 / \ / \_/ 0 \/ 12322223210012233343221112 As we can see, we can represent this (to a certain ...

code-golf array-manipulation

Pavel

16:05

smh Fedora 29 hit and still refuses to run Wayland on my laptop

I'm sure my gpu is incompatible or something like that but I wish I got an error message somewhere explaining what's wrong

i7-3667U integrated graphics, in case anyone knows anything

kwin_wayland and weston run fine...

Ye I can launch like a sub-wayland and then go on to nest a bunch of kde desktops on top of each other but I'm not sure how to tell it to wayland on launch

Anush

17:03

what's the smallest weighted graph for which BFS gives an incorrect shortest path?

graph-golf :)

2 hours later…

AdmBorkBork

19:30

CMC: Given an even number of input integers, add them together. However, when given an odd number of input integers, multiply them together. You're always guaranteed at least two inputs. Examples: 1 and 3, output 4. Input 2, 3, 4, output 24.

Adám

@AdmBorkBork APL (Dyalog Unicode), 11 bytes (2|≢)⊃+/,×/

Quintec

Yeah ok I'll just delete

Adám

@Quintec Your solution is was more general

Quintec

@Adám Speaking of arrays of functions...

Adám

@Quintec Yes, you could. (But it would be longer.)

Quintec

19:36

(I assumed as much)

Although isn't +/,×/ technically an array of functions?

ngn

@Adám remember the trick with rotate?

Adám

@ngn Ah, yes. ⊃≢⌽+/,×/

ngn

@Adám thumbs up

Quintec

Oh wow that's cool

Adám

@AdmBorkBork ^^^

Erik the Outgolfer

19:40

@Adám lol exactly

Adám

@Quintec No, it is a 3-train (a fork). Though in some ways, trains with , or ⍪ or {⍺⍵} as even tines act like arrays of functions.

trichoplax

20:01

@flawr Thanks flawr. I've been away from chat for a few days and reached the same conclusion but took much longer...

AdmBorkBork

20:31

@AdmBorkBork I have 38 bytes in PowerShell Try it online!

I'm not talking to myself. You're talking to myself.

AdmBorkBork

20:48

Have we had a challenge where you walk through an input string, go "down" if the next letter is further in the alphabet, and go "up" if it's earlier? Like the following for input abcad it shows as

a
 b a
  c d

Erik the Outgolfer

is that empty column necessary?

AdmBorkBork

No, that's a typo.

Erik the Outgolfer

hm, I guess not, but it's really 1) char codes 2) deltas 3) signs 4) cumsum 5) the rest

AdmBorkBork

Yeah, not a difficult challenge, but I was going to use it as a basis for a different challenge.

Adám

@AdmBorkBork Remove unnecessary part by giving number list as input.

AdmBorkBork

20:57

Not sure what you mean?

Erik the Outgolfer

is it really necessary to use letters?

AdmBorkBork

Oh, I see. Have it like 01212 instead

Adám

@AdmBorkBork Yeah.

Erik the Outgolfer

or [0, 1, 2, 1, 2]

Adám

Or any reasonable input format.

@AdmBorkBork What if it is the same? Stay level?

AdmBorkBork

20:59

Right. That might work better.

Yeah, same level would stay the same.

Erik the Outgolfer

essentially represent the signs of the deltas as a line

Adám

@AdmBorkBork Does it actually matter what the line is made of?

AdmBorkBork

No, not for my purposes

OK, that gives me some better direction to head with my challenge. Thanks!

Adám

@AdmBorkBork May we assume the first number is always 0/1 (up to answerer)?

AdmBorkBork

Yeah, probably.

Adám

21:04

@AdmBorkBork How about returning a Boolean matrix then?

1 0 0 0 0
0 1 0 1 0
0 0 1 0 1

AdmBorkBork

Hehe, that's an interesting take.

Adám

@AdmBorkBork In fact, 13 21 78 40 52 → 0 1 2 1 2 may be the very essence of the challenge.

AdmBorkBork

Hmm, kinda. I don't want to give away too much before I post it.

Zacharý

Wait, which challenge are we discussing?

AdmBorkBork

One I'm in process of drafting

Zacharý

21:08

Ah, I see.

Adám

100% on-topic — for once.

@Zacharý ĥe comes…

AdmBorkBork

lol

Zacharý

@Adám What?

Adám

4422

A: RegEx match open tags except XHTML self-contained tags

You can't parse [X]HTML with regex. Because HTML can't be parsed by regex. Regex is not a tool that can be used to correctly parse HTML. As I have answered in HTML-and-regex questions here so many times before, the use of regex will not allow you to consume HTML. Regular expressions are a tool th...