The Nineteenth Byte

PhiNotPi

00:16

Can someone explain what this "team spirit" stuff is about?

ASCII-only

@PhiNotPi One of the userscripts @ATaco wrote

ATaco

I plan to do a writeup about it.

New Main Posts

00:30

4

Q: Number triangle flip

Say you list the positive integers in a triangle, then flip it left-to-right. Given a number, output the number it's sent to. This is a self-inverse mapping. 1 1 2 3 3 2 4 5 6 <---> 6 5 4 7 8 ...

Phoenix

talk.tryitonline.net has an intresting score distribution.

Almost everything starred is by Dennis, who's on the red team, but primo has 37 stars on a message and balances the score singlehandedly.

@ATaco feature-request: Don't count pins when calculating score.

ATaco

00:53

I don't particularly feel like restricting pins, even though it's giving Blues a free 17 points.

I'm sure Mego's better than to cheat and give his team points.

DJMcMayhem

@NewMainPosts @xnor Awesome challenge! I like the idea for it a lot! :)

Phoenix

@ATaco I'm sure it's not intentional, but I'm confident that message would have less stars if it wasn't pinned.

Downgoat

01:28

@ATaco what does bar below chat message box mean?

ATaco

Points either team has, which is counted by stars in the star box.

Jan Dvorak

Is the script fixed yet, BTW?

ATaco

Regarding usenames?

Jan Dvorak

Regarding stars not showing

ATaco

That was fixed, if you install the update from the github

Jan Dvorak

01:35

Thanks

ATaco

As Meta bot will soon inform us, I created A writeup for TeamSpirit.

PhiNotPi

01:56

@ATaco is there a link to github anywhere in that post?

ATaco

There is now.

Conor O'Brien

I just got downvoted for having an answer that isn't according to the C spec smh

PhiNotPi

@ConorO'Brien 10/10 would violate C spec again?

Conor O'Brien

XD

Rohan Jhunjhunwala

@LeakyNun welcome back to ppcg!

New Meta Posts

02:11

-2

Q: Just what is "Team Spirit" anyway?

Those of you browsing The Nineteenth Byte have probably seen or heard about "Team Spirit" (Sometimes called "Team Wars"). It's become a bit inescapable, so this post will act as an explanation of what it is. This is not an official event. This is not managed by the Room Owners directly. This is ...

discussion chat

quartata

why am I in that picture

user165474

I'm Blue team?

user165474

Nope.

Leaky Nun

@RohanJhunjhunwala I thought you would be gone forever

user165474

Oh wait it's by chatID not userID

quartata

02:19

I'm almost never in this room

user165474

@LeakyNun I got a solution for the square root reduction thing; I sent it on Jelly Hypertraining

user165474

It's pretty much the same as yours but with concat instead of pair so ; rather than ,

Leaky Nun

@HyperNeutrino I saw it

user165474

Alright.

Rohan Jhunjhunwala

@LeakyNun I just wanted to thank you once again, you're beautiful optimizations on SIL still are going strong, and I have been able to add a few features including an actual parser, now you can say x = (10*y)+5^2

@LeakyNun there's also a standard library featuring trig functions and the such

New Main Posts

02:22

0

Q: Sp|Lit wo(r)dS, S(P)lit wO|rds

My brain is weird. For the last five years or so, I have cut words in half when I see them. When I started doing it, it took a mental effort - but I almost couldn't not do it. Now, I do it in the back of my head, and hardly even notice it. However, I thought this would make a great challenge. De...

code-golf string

Leaky Nun

@RohanJhunjhunwala wow, that's a huge improvement

Rohan Jhunjhunwala

@LeakyNun thanks!

@LeakyNun also, we created an esolang ide, its got support for a few different esolangs so far, and adding one is as simple as downloading the interpreter and typing a couple lines.

Leaky Nun

I see

Rohan Jhunjhunwala

github.com/rjhunjhunwala/S.I.D.E

Leaky Nun

Well, I think it would be good if you can answer some challenges in SILOS

ATaco

02:32

Turns out .bash_profile is broken in Fedora25 ;-;

Works if you use .bashrc or .profile, however.

Rohan Jhunjhunwala

@LeakyNun I've used it to do a couple here and there, but I'm really hoping someone tries the 2048 clone in SILOS I've even put up a bounty without a deadline if you might be interested. 500 rep for a command line solution and 700 for a gui based solution.

Leaky Nun

Link?

Rohan Jhunjhunwala

0

A: List of bounties with no deadline

500 rep for a SILOS submission of a 2048 clone. I'll even throw in a bonus 250 rep bounty (and of course give a week of bonus visibility). for one that has gui output (this is harder than it sounds). Feel free to use the developer tools, which integrate into this language nicely. 50 rep for ou...

@LeakyNun does this sound interesting, it might be a bit too time consuming?

Leaky Nun

I don't really know how to do it...

Rohan Jhunjhunwala

@LeakyNun there is a good it of documentation on the readme (github.com/rjhunjhunwala/S.I.L.O.S) essentially quite a few more commands have been added, while maintaining backwards compatability. There are queues and stacks, and if you are interested, the nibbles.txt example (snake clone I slapped together) might be a good source on how to emulate arrays with SILOS. essentially the heap is your friend

Leaky Nun

02:54

@isaacg should pyth.herokuapp.com have an anti-crashing mechanism?

Downgoat

@RohanJhunjhunwala you have taken AP CS A test right?

Rohan Jhunjhunwala

@Downgoat yes, you would get a 5 even if you wrote Jelly code on the exam

I wouldn't stress to much about the comp sci exams, stress about the other ones (looks at spanish book and cries)

Essentially the hardest parts are when they trie to catch you on so OOP technicalities within inheritance

Leaky Nun

@RohanJhunjhunwala what's the full mark?

Rohan Jhunjhunwala

@LeakyNun so It's fgraded from 1-5 and you need about a 75 to get a 5

Leaky Nun

I see

ais523

03:05

@RohanJhunjhunwala I once took a serious exam that said I could answer the question in any programming language

I thought that was a fairly unwise thing to write, as I already knew some fairly obscure languages (hadn't discovered esolangs yet, but I knew, e.g., a little-used asm variant)

in the end, though, I answered in pseudo-BASIC (which arguably isn't even a real language by PPCG's definition) on the basis that it would be easy to mark

Downgoat

@RohanJhunjhunwala How this the hand tracing though? Where they give you a random unlabeled loop and you have to solve something?

Rohan Jhunjhunwala

@ais523 unfortunately I was being somewhat sarcastic when I said you could get away with writing jelly on the exam. However, there is an AP CS Principles which can be taken in any language one sees fit (including brainfuck one would conclude). They do unfortunately explicitly require java :(

ais523

many fundamental CS concepts don't really exist in BF unless you embed an interpreter into it

that can handle them

Rohan Jhunjhunwala

@Downgoat not too bad, it generally does something standard like print a pyramid with increasing numbers. Just pretend to be a computer and run the code on the paper if you can't see an obvious pattern at first

@ais523 yeah, essentially you have to roll every data structure for yourself and standard efficiency metrics don't quite work (adding numbers is in linear time) etc... but unfortunately CS principles is more of a class on working as a developer than actually learning code (you can take it in scratch too)

Downgoat

Idea: C to BF compiler :D

(just syntax stuff)

ais523

03:11

@RohanJhunjhunwala BF can actually add numbers in O((log n)²) if you use an appropriate representaiton

that's still worse than most practical languages, though (which add in O(log n))

@Downgoat I spent quite some time working on one of those

Rohan Jhunjhunwala

@ais523 what sort of representation do you use? a bit table?

ais523

I eventually gave up when it came to represent multiplication

@RohanJhunjhunwala yes

store in binary on the tape, probably on alternate cells so that you can use the other alternate cells to record the length of the number

Rohan Jhunjhunwala

@Downgoat I do believe one does exist... esolangs.org/wiki/C2BF not sure how good it is.

I had played around with a compiler to compile some kind of low level assembly to bf, essentially all i managed to implement was a cat function and a function to print a given string n times...

Downgoat

Next Step: Create CPU taking BF as instruction

ais523

oh, I was writing a backend to gcc

@Downgoat those are fairly easy to write I think; not sure if anyone's actually done it on hardware but a simulation wouldn't take long to write in VHDL/Verilog

Downgoat

03:15

ah, I was thinking hardware

I'm curious about performance and how such could be optimized

ais523

well, VHDL and Verilog are what most people use to write hardware descriptions

Downgoat

:O I just found out Cee-Lo Green was on a band

ais523

you can literally just send them off to a semiconductor manufacturing company and have them built if you have a few million dollars to spare (which isn't much for large companies)

Rohan Jhunjhunwala

@Downgoat i think I saw one of them somewhere... robos.org/sections/electronics/bfcomp

ais523

you can also run them on simulators, which can be highly accurate to the real world if you want them to be

or you can run them on FPGAs, which are basically reconfigurable hardware

a decent FPGA costs a few hundred dollars, a cheap one is tens of dollars

and can turn into basically any piece of digital hardware you want that isn't too complex

such as, e.g., a BF-running CPU

(also they're reusable many times, so you can reconfigure them to something else when you're done)

FPGAs exist that are powerful enough to compete with modern CPUs (i.e. can mimic them, pretty much), although those are rare

Downgoat

03:22

huh, I thought FPGA are used for highly specialized tasks but I suppose it works for this :P

ais523

it's more that you can use them for anything, but if your task isn't highly specialised there are probably other options you can use instead, and those other options are probably cheaper

if it is highly specialised, then often you won't have any alternative

they're good for hobbyist stuff, though, along the same lines of reasoning (especially if you're just using a simulator, which is free and lets you see how your CPU design or whatever would work)

obarakon

Any idea why 0202+"" in JS becomes 130?

user165474

Octal?

user165474

0202 -> 202 base 8 -> 2 * 64 + 2 -> 130

ATaco

Yeah; jS defaults to Octal.

No idea why, but it's a thing it does.

ais523

03:33

to be precise, it's the leading 0 that triggers octal interpretation

that's a method of specifying octal in many languages

but it's confusing, so many more recent languages use some other syntax (e.g. 0o)

ATaco

I'm not sure why you'd need the leading 0.

ais523

like, a leading 0 is just the syntax for a number being in octal

obarakon

Hm, ok. Thanks guys.

ais523

just like 0x is used for hexadecimal

and the only reason it's confusing is that a leading 0 is meaningful in decimal too

(it's a common obfuscated code trick to stick a few octal constants in the middle of a mostly decimal array)

ATaco

I can't think of a situation in which a leading 0 won't be clipped, unless it's 0.11...

obarakon

03:34

That JS quirk is totally making it hard to golf my Japt answer :/ ethproductions.github.io/japt/…

ATaco

if you've got it as a string, such as "0202", than Number("0202") works considerably better than "0202"+0

Downgoat

@obarakon AFAIK it was dropped in ES6?

browers likely support it because of backwards comptaibilty

ATaco

However, I'm pretty sure the +0 trick only works in lua.

ais523

@ATaco you can delete a leading zero before a decimal point in most languages

ATaco

Most, but not all.

ais523

03:37

@ATaco +0 would work in Perl too to numify something, there just isn't normally much point unless you care specifically about the string representation of the number that's represented by a string

Destructible Lemon

hi

ATaco

Lua strings do some weird things, it's usually better to numberfy your numbers.

ais523

I actually like the way Perl does strings vs. integers

Destructible Lemon

blue team 4 eva

user165474

Hello.

ATaco

03:38

for i=1, "3" do end errors. But for i=1, math.sin("12312") do end is perfectly fine.

Thanks lua.

ais523

that's the sort of thing that would never happen in Perl

the vast majority of the language semantics are designed such that '3' and 3 are indistinguishable

(and internally, there are actually three relevant storage formats: string, integer, and "both string and integer"; this isn't counting things like floats)

ATaco

An issue with Lua's string-number usage is that strings are ever-consuming.

a = 3
b = "2"
a = a + b

Would make a a string.

Jan Dvorak

CMC: create a Perl value that is both a 3 and a "4"

ATaco

I can do it in Lua..?

Destructible Lemon

@JanDvorak wat

ATaco

03:41

Kind of.

ais523

@JanDvorak off the top of my head, use Scalar::Util "dualvar"; $x = dualvar 3, 4

I might have the arguments to that backwards

this is also obviously golfable

ATaco

In RProgN2, `4`3= makes 3 into the string "4".

ais523

I'm not aware of a way to create arbitrary combinations without reaching into the internals and tweaking them manually (which is what dualvar does)

user165474

So wait, then 3+3 after than would give "44"?

ATaco

(The value of 3 is left the same, it's just the command 3)

Jan Dvorak

03:43

@HyperNeutrino I would think it's 6, "44"

user165474

Oh, okay.

user165474

Thanks.

ais523

Perl has different operators for working on string values and on integer values

Jan Dvorak

but I haven't touched Perl in ages

ais523

if you add with + you get 6, which stringifies to "6"

ATaco

03:44

I'm not even confident to say I understand perl.

ais523

if you add with . (string concat), you get "44", which intifies to 44

few people understand Perl

Jan Dvorak

If somebody says they understand Perl, don't listen to them.

ATaco

I know Jelly better than I know Perl. And no-one knows Jelly.

ais523

I've gone several layers deep into the internals and have a fairly good idea of what I'm doing, but even then I still don't understand why many of the choices were made

my favourite identifier from the Perl internals (which is used in quite a few places) is SV_CHECK_THINKFIRST_COW_DROP

user165474

Um... WAT

quartata

03:48

@JanDvorak :(

ais523

it makes more sense in context

Jan Dvorak

still better than T_PAAMAYIM_NEKUDOTAYIM

ais523

I could explain what it does but it's more fun to laugh at the absurdity of the name

(also this is never visible to user code unless you want to screw around in Perl's internals directly)

Jan Dvorak

I'm curious what it's for

ais523

@JanDvorak the only thing wrong with that is that it's in a non-English language for no obvious reason

IIRC if you translate it into English it makes sense

quartata

03:50

perlguts is truly terrifying

Jan Dvorak

@ais523 it's to pay respects to one of the devs.

ais523

@JanDvorak well, let's see: an SV is Perl's name for what I call a "scalar container" (which is less confusing than the official name of "scalar value")

it's something that can contain one scalar, such as a scalar variable or an array element

Jan Dvorak

COW = copy on write?

ais523

yep, COW means copy on write

Jan Dvorak

it's funnier if taken literally. Worms, anyone?

ais523

03:51

and "THINKFIRST" is basically a collective name for all the properties that stop you just outright changing a value directly in memory

Downgoat

O_O I peeked into perlguts and this is worse than the time I peeked into sheep pen

Jan Dvorak

@ais523 <3

ais523

so this is saying, given a scalar container, see if there's some reason its contents can't be edited directly (e.g. because it's a copy-on-write value or because there's something else going on)

if that is the case, make a copy of it (i.e. drop the copy-on-write property) and use that instead

Jan Dvorak

nice

quartata

@Downgoat It works and it's very fast so we can't complain too much

Downgoat

03:53

I prefer Cheese to Cow Droppings TYVM :P

quartata

But embedding Perl is usually rather unfun

ais523

@quartata we can still complain about the memory usage though

I wrote a build system in Perl

quartata

That's true

ais523

and ended up needing to write my own profiler to work out why on earth it was using > 1GB of memory

(even so, it doesn't seem plausible to get it much below a few hundred megabytes, which is just ridiculous)

Downgoat

wait what how does perl do prime so fast what

ais523

03:59

Perl has a really good set of libraries, basically because it's been accumulating them for so long

Downgoat

actually omitting startup time it's about the same as cheddar

ais523

many of which are highly optimized, and which don't necessarily have to use Perl for their calculations

Perl has a commonly used FFI to C

and can also interface with basically anything, that's one of its biggest strengths

it's an excellent language for gluing unrelated systems together

Jan Dvorak

Also, for building the Universe.

Source: xkcd.com/224

2

Riker

@MartinEnder how close are you to archeologist?

@ais523 lol, I remember when flawr was sad he got it

he was the highest rep user without any gold badge

Phoenix

06:09

Why does libre office have an option in settings titled "Basic IDE Options"

betseg

Is Reddit down

Phoenix

Yes

Martin Ender

06:29

@Riker not very close

Only 17/100

Leaky Nun

@MartinEnder do you think Retina would be good at this challenge?

Martin Ender

Certainly doable, but probably not "good"

Phoenix

06:44

I think ^ applies to pretty much everything we do on this site, so go ahead and try.

Leaky Nun

06:56

@MartinEnder I can't get this to work

it should match triangle numbers

Kritixi Lithos

@LeakyNun I think you need a $ at the end

Leaky Nun

I want to match the triangular numbers inside

so 14 should give 4 matches (one for 1, one for 3, one for 6, and one for 10)

Martin Ender

well you've anchored the match to the beginning of the string, so this can produce at most one match

Leaky Nun

but I used &

Martin Ender

so? that just attempts a match from every starting position, but ^ can still only match the beginning of the string.

Leaky Nun

07:05

you're right, but I tried this as well, which should theoretically work.

Martin Ender

no, because lookbehinds are matched from right to left

I have a write-up on this here: stackoverflow.com/q/36047988/1633117

this works, but I'm not sure whether it's the shortest: tio.run/nexus/retina#@68RY6hXE6enqa2nxaWibPj/vyEKAAA

here's a solution with & at the same byte count, but it gets a byte longer if your program has further stages: tio.run/nexus/retina#@6@WoKFhr2GoGWOoqaeprfL/vyEKAAA

Qwerp-Derp

07:21

Hello!

Luke

07:59

Good morning

Qwerp-Derp

08:51

I don't really like IntelliJ :(

Kritixi Lithos

^ me too

Qwerp-Derp

It takes too damn long to load, and it really eats up your battery

Kritixi Lithos

it takes over 5 minutes to start for me

Qwerp-Derp

@KritixiLithos You want to move the EssentialGUI project to a default thing?

Kritixi Lithos

what do you mean by a "default thing"?

Qwerp-Derp

08:52

Like a folder without the IntelliJ stuff

Just a normal package

Kritixi Lithos

okay, but I don't know how to run the project then

@Qwerp-Derp DO you know how to run the project from the command-line without IntelliJ?

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Draw a Simple Chaos Game code-golf fractal random Chaos games are a method of drawing fractals using an initial point and a fractal. At random, a vertex of the polygon is chosen and a new point is drawn a given fraction between the initial point and that vertex. Repeat the process for long enou...

Leaky Nun

CMC: given eg. "c", print:

c
cc
ccc
cccc
ccccc

Jan Dvorak

->x{puts"*\n**\n***\n****\n*****".tr ?*,x}

Kritixi Lithos

Naive approach, Carrot, 19 bytes, replace all the cs with #s and you get the code

Jan Dvorak

09:07

->x{5.times{|i|puts x*(i+1)}}

Anonymous

@LeakyNun Actually, 4 bytes: 5r*i

Jan Dvorak

->x{1.upto(5){|i|puts x*i}}

Ruby, 27 bytes

Anonymous

Ack, should be 5R*i. I transcribed it incorrectly.

Fatalize

@LeakyNun Brachylog, 6 bytes: j₅a₀ẉ⊥

Leaky Nun

09:30

@Fatalize that was nice

CMC: do the above CMC in Pyth

flawr

4

source

Anonymous

09:53

@LeakyNun 6 bytes: V5*hNQ

Leaky Nun

You can omit the final Q

Anonymous

Huh, TIL

Anonymous

I'm still not very good with Pyth

Leaky Nun

Practice makes perfect

betseg

@LeakyNun Brainfuck, 39 bytes: ++++++++++>,.<.>..<.>...<.>....<.>.....

Anonymous

09:57

VS5*N also works for 5, and is arguably cleaner

Leaky Nun

well that also works

@betseg 1 byte less

Brain-Flak, 78 bytes: ((()()()){}){(({}[()])<{({}<(({}<>)<>)>[()])}{}>)<><((()()()()()){})><>}<>{}{}‌

Qwerp-Derp

@KritixiLithos Hang on, I'm figuring it out

Does anyone know any Java?

Anonymous

10:17

Nope, literally nobody

Qwerp-Derp

I have a problem: so I have a file directory like so:

Anonymous

Nobody learned Java in high school or college

mınxomaτ

@Mego That's a weird directory layout

Qwerp-Derp

src
  - TestPackage
    - builtins
      - Derp.java
    - Main.java
test
  - Test.java

How do I import Derp.java inside builtins from Test.java?

Anonymous

@mınxomaτ That's what you get when you don't learn Java

Anonymous

10:19

@Qwerp-Derp import TestPackage.builtins.Derp;?

Qwerp-Derp

Whoops made a mistake

test is meant to be on the same level as src

Anonymous

Well there's your problem

Anonymous

The directory layout should look like this:

Anonymous

TestPackage
  src
    - builtins
      - Derp.java
    - Main.java
  test
    - Test.java

Anonymous

With the packages TestPackage, TestPackage.builtins, and TestPackage.test

mınxomaτ

10:23

On the same note, is anyone using Rust for linux programming here? I'm a bit confused by the libc binding. On the one hand, Rust sells itself as a systems programming language, but every system call (and everything else in libc for that matter) requires an unsafe {} block. I mean, it works, but it's a bit clunky - there has to be a better way.

Qwerp-Derp

@Mego But there's a src there, why is the package still TestPackage.builtins?

Shouldn't it be TestPackage.src.builtins?

Anonymous

@Qwerp-Derp No, src is just the directory where you put your source files (as opposed to bin).

Anonymous

It's not part of the package tree's name because it's implicit

Kritixi Lithos

10:48

@Qwerp-Derp Have you already figured out how to run Java with Processing as a library from the command-line?

Qwerp-Derp

@KritixiLithos Not yet

betseg

11:08

A few years ago I Google'd an error message and the only thing showed was the source code of the program ;_;

Qwerp-Derp

11:21

@betseg That's really unlucky

Fatalize

@betseg Thanks for the star

betseg

@Fatalize Which star

Fatalize

@betseg The github one

betseg

Ah

New Main Posts

0

Q: Find how many alphanumeric characters that can be made up of a single number

The alphanumeric characters have ASCII-values: 0-9 -> 48-57 A-Z -> 65-90 a-z -> 97-122 Your challenge is to take an integer as input, and output how many characters can be made using consecutive digits of that number. The character codes may be overlapping. 666 should result in 2, since ...

code-golf string

New Main Posts

12:25

4

Q: Rational decomposition a = xyz(x+y+z)

Write functions x(a), y(a) and z(a) such that for any rational a all functions return rational numbers and x(a)*y(a)*z(a)*(x(a) + y(a) + z(a)) == a. You do not need to use rational types or operations in your program, as long as your program is mathematically sound. E.g. if you use a square root...

code-golf math rational-numbers

Leaky Nun

12:36

CMC: determine if a number is an Achilles number

Jan Dvorak

Interesting class of numbers

orlp

@LeakyNun I think you'll like my challenge :)

user165474

I'm trying to make x(a) * y(a) * z(a) = 1

Jan Dvorak

Ruby, longer than desirable: require'prime';->x{d=x.prime_division;d.size>1&&d.all?{|_,n|n>1}}

s/require/load/

orlp

@HyperNeutrino I added an example to my challenge for a = 1

user165474

12:51

Alright, thanks.

user165474

Oh no D:

Qwerp-Derp

Yay I made something cool in Stacked: Try it online!

user165474

What does this do?

user165474

Oh I see.

Qwerp-Derp

It took a while to make

user165474

12:55

Nice! I see. That's interesting.

Qwerp-Derp

I should comment it to make it fully readable

Nathan Merrill

@MartinEnder Does that come with the design?

Anonymous

@LeakyNun Actually, 20 bytes: w;⌠iX1<⌡Mπ@⌠iX⌡Mg1=*

Anonymous

Translates to "are all exponents greater than 1 and is the GCD of all exponents 1?"

Qwerp-Derp

This is the fully readable program with comments:

(* Wraps every item in `list` in an extra list:
 * ( 1 2 3 ) listify => ( ( 1 ) ( 2 ) ( 3 ) ) *)
{ list :
  { i :
    list i get wrap @temp
    list i temp setprop
  } 0 list size 1- for

  list
} @:listify

(* Given two lists, returns the vector product of
 * the two lists.
 *    ( 1 2 ) ( 3 4 ) product
 * => ( ( 1 3 ) ( 1 4 ) ( 2 3 ) ( 2 4 ) ) *)
{ list1 list2 :
  ( ) @prodout

  { i :
    { j :
      list1 i get @templist
      list2 j get @tempel

      prodout templist tempel ++ push
    } 0 list2 size 1- for

Sorry if this seems long

The link is too long to paste here

user165474

13:00

hastebin.com

Anonymous

You could minify the link via goo.gl

user165474

^ Or that :P

Qwerp-Derp

Or you can go here for a prettified version of the code

New Main Posts

13:18

0

Q: From Programming Puzzles to Code Golf

Your task is to write a program that outputs the exact string "Programming Puzzles" (trailing newline optional), but when it is golfed (all spaces, tabs, and newlines removed) it outputs "Code Golf" (trailing newline optional.) Good luck!

code-golf

mınxomaτ

GitHub Orga Bug has it's 6 months anniversary

orlp

is it a good sign that people repeatedly ask on my challenges whether it's possible at all?

mınxomaτ

Without looking at it, you might want to include a reasoning why it is possible from the start.

quartata

@Downgoat Stop comparing trial division in Perl to calling a prime number sieve in C++

:P

@mınxomaτ I thought they had fixed that?

orlp

@mınxomaτ the proofs I'm aware of are constructive

mınxomaτ

13:26

No, they didn't.

orlp

therefore they'd spoil the solution

I assume you don't want to show a proof because it would give away a solution, but your word is not really a proof. — Fatalize 1 min ago

Fatalize

I don't really like this challenge because it's more of a math challenge than a programming challenge

orlp

@Fatalize there are infinite solutions

some can be golfed much better than others

it's a very interesting golfing challenge IMO

also if you don't like math challenges you can blacklist the math tag and they will no longer show up for you

mınxomaτ

@orlp Well, too bad. IMO code golf is about the implementation. Maybe someone comes up with an entirely different solution (however unlikely). If you challenge is only challenging because of it's obscurity (missing information), it's not a very good PPCG challenge IMO.

Fatalize

The point is that finding a solution is a math problem, and golfing it after that is trivial, so really the hard part is finding a soution

mınxomaτ

13:28

Basically that

orlp

I think choosing the right algorithm is more important than the right implementation, and this still holds true for code golf

almost always the shortest answers do something in a clever way

Fatalize

Also are bruteforce methods allowed? I don't know if your post implies that x, y and z should work independently from each other, because you say a single program is allowed

orlp

that goes beyond just changing the implementation

@Fatalize what do you mean 'work independently from eachother'

I forgot to disallow bruteforcing though, hold on

Fatalize

Well I can just build a program that looks for x,y,z such that it works in a bruteforce way, and return x,y,z

but I can't get a value for x, y or z from the input without the other ones

orlp

@Fatalize that's not true

lets say in Python I have some magical function f(a) that returns x, y, z through whatever means (e.g. it could be bruteforce)

then x = lambda a: f(a)[0], y = lambda a: f(a)[1], z = lambda a: f(a)[2]

Martin Ender

13:39

@NathanMerrill it gets unlocked when the top 40 tags have at least 200 questions each

Fatalize

Sure but you still compute y and z to get x

my point is: do you have to be able to compute x independently from y and z (and vice-versa), or is it fine if you always compute the three at the same time

orlp

@Fatalize that's fine

user165474

@Martin Wait what is this?

Martin Ender

the Generalist badge

user165474

Oh I see.

user165474

13:43

So wait, it's not achievable right now?

Martin Ender

correct

user165474

I see. What is the Generalist badge and how does one achieve it once it's unlocked?

Martin Ender

score 15 in 20 of those 40 tags

user165474

Oh I see.

user165474

Time to start asking questions ^-^ :D

user165474

13:49

Contact

For playing the game Contact, where one person tries to "defend"...

user165474

Anyone interested? We need more people for a game.

Kritixi Lithos

The rules are in the room

Business Cat

14:10

Is anyone here familiar with Ruby?

Nevermind, I figured out what I needed

betseg

14:28

error418.net wow

user165474

Haha yes I remember that. I was reading through 4xx HTTP status codes and I came across this :P

Anonymous

@betseg google.com/teapot

6

Anonymous

If you go to it on mobile and tilt your device, the teapot pours

betseg

i know that too. also click the teapot, or on mobile...ninja'd

Anonymous

You can also click it but that's boring

Riker

14:30

double ninja'ed lol

user165474

ninja'ception

Anonymous

Cross-ninja'd

Riley

14:49

@Adnan I was looking at this answer of yours. Why does it get the right answer for [([]{})<{[()<()>]}()>{}], but not for [({})<{[()<()>]}()>{}]. The only thing I changed was removing [] from the input.

DJMcMayhem

Weird, it doesn't work for [({})] either. Try it online!

New Main Posts

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Q: Write a mutating, replicating program

This is a variant on the self-replicating program, defined here as a program that outputs its source (or a quine). Below is an example of a self-replicating program in Python: with open(__file__) as f: print f.read() When run from a file, this script should output itself. Instead of a self-re...

code-golf

Emigna

It only infinitely recurses over each replacement string once. Not the whole list of replacements.

Riley

Why does it work for that long one then?

[([]{})<{[()<()>]}()>{}]

Emigna

Check this for example.

DJMcMayhem

14:58

I don't understand that at all

Contact

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