The Nineteenth Byte

zyabin101

12:00 PM

Challenge type idea: Hand crafting a QR code, with certain conditions.

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Stackable sequences You deal cards labeled 0 to 9 from a deck. When you deal a 0, you place it to start a new stack. When you deal any other card, you stack it atop a card that's exactly one lower in value, covering it. That way, each stack starts at 0 and counts up by 1. If you can't place the ...

Bas

12:17 PM

@zyabin101 Has been done I think

zyabin101

@Bas I mean, make the QR code with the smallest side length.

Bas

@zyabin101 Ah okay, cool

LegionMammal978

> A lock is a private/public system where a physical public key is used to access the internal private mechanism(tumbler). When a user inserts a copy of the public key, they can gain access to the door and can modify it's internal states(like unlocking, and locking it).

orlp

12:35 PM

speaking of locks

there is a cool analogue of RSA that allows you to securely transfer the contents of a box from one person to another with just padlocks, without having to give away your key

alice puts the thing to transfer in a box, and locks the box with her padlock

she sends the box to bob, who also puts his padlock on the box (so now it's doubly locked), and sends the box back

alice removes her padlock, leaving just bob's padlock, and sends the box again

now bob can remove his padlock, and can open the box

@QPaysTaxes asymmetric*

Sp3000

^^ I got asked that by my maths teacher many years ago when I was bored in class. The only difference was that the box had a teddy bear and the postman was really evil

orlp

@Sp3000 we also assume that the postman does not possess an angle grinder :P

Sp3000

Yeah, I didn't get it at the time. I said "use a num-lock" to which she responded "if Bob has the patience the crack that, then so does the evil postman"

TimmyD

> will hunt down and ~~arrest~~ kill the person responsible.

ftfy

orlp

> will try to hunt down but will never find the NSA operative

here's another plan

you ship 100 boxes

one of which contains the teddy bear

Mars Ultor

12:44 PM

@orlp That's even more shipping charges

Sp3000

@QPaysTaxes How do you tell Bob that the strip of paper is actually significant without the postman knowing?

orlp

the others contain anthrax that is immediately spread into the air when the box is opened

Mars Ultor

@orlp 2 x heavy duty padlocks is way cheaper

TimmyD

@orlp Oh, that's easy. You just get a lineup of 100 prisoners that are tired of thinking about a light bulb ...

Sp3000

I'll stick with the tripled shipping charge, thanks

Bas

12:46 PM

I like your unorthodox ways of thinking

Mars Ultor

> you ship 100 boxes

@Sp3000 ^ Compared to x100 shipping charges, it's a lot cheaper

orlp

alternatively

we can do a key exchange

we do the triple shipping charge thing once

but we're not shipping a teddy bear

we're shipping a duplicate key for a padlock

so that both alice and bob have the key

this is a one-time setup cost of 3 shipping charges

but sending the bear now only costs 1 shipping charge

Mars Ultor

@orlp *Multiple duplicate keys

orlp

@MarsUltor why?

Mars Ultor

Well, in the real world analogy, it's a lot cheaper (for future teddy bears)

Sp3000

12:49 PM

If you do want to send a lot of boxes though, you can send 1000 num-locked boxes, each of which just has a number and a long passcode inside. Bob picks one, cracks it, then tells Alice "I cracked number #n". Alice then sends the real box, with a mega-numlock where the code is the passcode Bob chose.

Mars Ultor

But of someone happens upon them, then it's not good

Bas

@Sp3000 If the postman is evil enough, he will memorize the passcodes in all 1000 boxes

Sp3000

Hmm, guess we need more boxes then.

Bas

@Sp3000 Bob should instead pick 2 boxes and concatenate the passcodes

zyabin101

@Downgoat Preinitialise ಠ_ಠ to ಠ_ಠ :P

Golfier. :P

Sp3000

12:51 PM

2 boxes actually doesn't help all that much

Bas

@Sp3000 No actually you're right

Geobits

You could probably skip the mail thing and just have Alice take a plane and hand it to him. Cheaper that way.

Mars Ultor

Actual solution: avoid this and use RSA

zyabin101

@MarsUltor ಠ_ಠ

Geobits

You can't RSA a teddy bear :(

6

Sp3000

12:52 PM

@Geobits Unless you can hide in the luggage compartment, that doesn't stop the postman being the pilot

Bas

Actual actual solution: Pay your neighbour kid 20 cents to deliver it to Bob

Mars Ultor

Saves almost 100% shipping charges, reduces authorities after you by almost 100%

zyabin101

@Geobits You can RSA a teddy bear. :-)

Bas

@zyabin101 3d printers are a thing nowadays

Mars Ultor

@Geobits You can heavy-duty padlock a heavy-duty box containing a teddy bear

Geobits

12:53 PM

@Sp3000 Ok, but what postman that could also turn out to be a pilot couldn't get his hands on a $10 pair of bolt-cutters?

TimmyD

Why doesn't Alice just invite Bob over for tea and give him the bear in person? I mean, they're obviously good enough friends that they're exchanging teddy bears, maybe it's time they take the relationship to the next level.

Mars Ultor

@TimmyD Maybe they're pen pals?

Bas

@TimmyD And while they're at it, make some use for the teddy bear as well (if you know what I mean)

Sp3000

@Geobits I dunno, this is the same world where Alice needs to send a box to Bob for some unknown reason. We make this up as we go, right?

Geobits

Why is this postman such an ass anyway?

Did a teddy bear hurt him in the past?

Bas

12:55 PM

@Geobits Because Bob stole his ex-girlfriend (Alice) obviously

zyabin101

@zyabin101 Alice takes a photograph of the teddy bear with a link to it on an e-Store and a gift card for that store steganographed over it, then RSA's the result and sends to Bob.

Geobits

@Bas I kinda always knew she'd end up his ex-girlfriend.

@zyabin101 So then Bob orders it and the postman steals it enroute. Genius :)

orlp

> Oak: I don't know who you are, but I will find you, and I will tell you that now is not the time for that.

zyabin101

@Geobits The postman's name is Eve.

Right. ( ͡° ͜ʖ ͡°)

TimmyD

@Geobits Well, but if the postman is looking for a package from Alice, this just may work.

Geobits

1:03 PM

Any smart postman would be monitoring all of Bob's mail, but I suppose you could fool a dumb one this way.

TimmyD

Well, meaning is the postman intercepting Alice's mail going outbound, or Bob's mail coming inbound.

Geobits

Then again, there are probably easier ways if that's the case. Just put a false return address on it for instance.

orlp

guys

I have a confession to make

I secretly have a superpower

Sp3000

Is it being able to add 1 to any integer?

TimmyD

Oh, is it the power to fill things up?

New Sandboxed Posts

1:04 PM

0

A: Sandbox for Proposed Challenges

Golf K-means K-means is a standard unsupervised clustering algorithm, which, given a set of "points" and a number of clusters K, will assign each "point" to one of K clusters. Pseudo-Code of K-means Note that there are many variants of K-means. You have to implement the algorithm I am describi...

TimmyD

Cuz that's a great super power. Car run out of gas? Fill it up. Bank account empty? Fill it up. Fighting a bad guy? Fill up their bladder.

Geobits

Huh, I coulda sworn we already had a k-means golf, but I can't find it.

orlp

My super power is... the gift of hindsight.

TimmyD

Oh, so like Captain Hindsight?

Geobits

I knew he was gonna say that.

Bas

1:07 PM

@orlp Let me guess, in hindsight you should've picked another superpower

@Geobits Wow, you're gifted as well

Geobits

That's what they tell me.

Bas

1:19 PM

Rip great conversation about teddy bears, evil postmen, RSA and other nonsense

zyabin101

@Bas Live forever great conversation about teddy bears, evil postmen, RSA and other nonsense!

Book marking conversation.

Bas

@zyabin101 How?

zyabin101

@Bas I'll use the room menu!

How should the great conversation about teddy bears, evil postmen, RSA and other nonsense be called?

Bas

Ah cool I see

zyabin101

@orlp ^^

Bas

1:22 PM

Why not exactly that? Lol

zyabin101

@Bas Done.

About teddy bears, evil postmen, RSA and other nonsense

47 mins ago, 31 minutes total – 99 messages, 9 users, 1 star

Bookmarked 11 secs ago by zyabin101

Bas

@zyabin101 Sweet

Eᴀsᴛᴇʀʟʏ Iʀᴋ

@zyabin101 no, that repo contains the bot password and anyone can use him.

zyabin101

@EᴀsᴛᴇʀʟʏIʀᴋ No, that repo contains the bot password and that's bad. Hackers can see the bot password on GitHub and log into the bot's account to spam the room. That's why the password must be sanitised.

It's even better to use the Slack API for Bot Users instead.

But idk how to use it with Python ¯\_(ಠ͜ ಠ)_/¯

Eᴀsᴛᴇʀʟʏ Iʀᴋ

Slack Api is garbage.

@CᴏɴᴏʀO'Bʀɪᴇɴ according to my parents, even if you are not a stalker you are still a bad influence and thus so is code golf. My time here will be reduced for the next week.

Bai!

zyabin101

1:34 PM

@EᴀsᴛᴇʀʟʏIʀᴋ wai ;_;

@EᴀsᴛᴇʀʟʏIʀᴋ BAI

Eᴀsᴛᴇʀʟʏ Iʀᴋ

Becaus I spend too much time in the blogosphere

zyabin101

b-b-but it powers almost every bot on Slack.

Including Hubot! Wai you indirectly dislike Hubot? ;_;

Eᴀsᴛᴇʀʟʏ Iʀᴋ

Yeah.

zyabin101

@EᴀsᴛᴇʀʟʏIʀᴋ And what?

quartata

@Mego Do you know which IRC daemons support svsnick?

Eᴀsᴛᴇʀʟʏ Iʀᴋ

1:46 PM

@zyabin101 ?

zyabin101

@EᴀsᴛᴇʀʟʏIʀᴋ You said yeah, and what?

Eᴀsᴛᴇʀʟʏ Iʀᴋ

Slack api is too complicated. Give everbody free source code access. :P

zyabin101

@EᴀsᴛᴇʀʟʏIʀᴋ ಠ_ಠ It isn't.

quartata

Looks like you just open a websocket and send appropriate bits of JSON

Eᴀsᴛᴇʀʟʏ Iʀᴋ

Has too many api keys and permissions.

Well, bai!

zyabin101

1:54 PM

BAI

Kenny Lau

Do we have a challenge to add two numbers?

or anything duplicate of it?

quartata

@KennyLau ...joke, right?

Bas

@KennyLau I sure as hell hope so

Kenny Lau

@quartata Just asking if we have such a challenge.

zyabin101

@EᴀsᴛᴇʀʟʏIʀᴋ github.com/os/slacker

Bas

1:56 PM

If not, you could make one and get downvoted to oblivion :p

There's trivial, and there's adding 2 numbers trivial

TimmyD

Yeah, we've probably got that covered somewhere in this selection of 369 challenges ...

codegolf.stackexchange.com/search?q=add+two+is%3Aquestion

Kenny Lau

@TimmyD Can't find one.

TimmyD

Well, if you can make it interesting, with enough of a challenge to make it more difficult than a one-byte answer (which is what it would be in many esolangs), go ahead and Sandbox it up.

zyabin101

Challenge idea: make a program which computes the string with the smallest possible MD5 hash.

The string may only include printable ASCII, and it must finish in 30 seconds.

TimmyD

@KennyLau Here are three PowerShell solutions, all of them 17 bytes in length oddly enough

param($a,$b)$a+$b
$args[0]+$args[1]
$args-join'+'|iex

zyabin101

2:03 PM

I know you are trying to say that computing the string with the smallest possible MD5 hash in 30 seconds is impossible. Ikr.

But you have to try to get the smallest hash.

Bas

@zyabin101 I think that was directed at the "add two numbers" challenge

Kenny Lau

@TimmyD We already have this :(

39

Q: Adding Numbers with Regex

I want to try a new type of regex golf challenge, which asks you to solve nontrivial computational tasks with nothing but regex substitution. To make this more possible and less of a chore, you will be allowed to apply several substitutions, one after the other. The Challenge We'll start simple...

zyabin101

@Bas Ah.

@Bas That wasn't.

quartata

@TimmyD Is the | a pipe like in bash?

Powershell actually looks like it might be fun to golf in

TimmyD

@quartata Kinda. It's an intrinsic part of the language itself, rather than a separation between components like in other shells.

The key point to remember is that PowerShell is an object pipeline, not a string pipeline like other shells. Passing things from one command or value to another via the pipe passes it as an object, so methods and the like can be preserved and manipulated.

For a really simplistic example, here's an Exchange-specific command

Get-AddressList | Update-AddressList

The first command will return a collection (it can be thought of as an array, though it's not really) of all address lists in the environment. The second command will be able to implicitly parse the .Identity parameter of the input object(s) and use that for execution.

New Main Posts

2:17 PM

0

Q: Long jump info system using dictionaries in python 3

this is the brief I have to do: Its for an athletics long jump contest. The program will 1. prompt the user for the names of competitors, then 2. for each competitor, ask for the distances that they jumped, then 3. print a table of competitors and their best jumps, and then finally, 4. print the ...

python

Kenny Lau

Thanks @NewM..... nothing

Nathan Merrill

I haven't gotten much feedback on my meta post:

6

Q: Tour to Improve the Discoverability of Old Challenges

We've got some pretty great challenges here. However, after a month or so, challenges get little to no activity. Since we aren't a Q&A site, we rarely get traffic via searches. I would love it if we could introduce users to high quality questions that they may not have found on their own. I b...

discussion

If this does happen, it needs quite a bit of community participation, so I'd like to know if it is interesting (aka, would you participate?)

orlp

> In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move.

@NathanMerrill I think we should feature no more than one challenge per author in the tour, to promote variety

Nathan Merrill

@orlp I agree that variety is important, but I'm not sure if that restriction really promotes variety. We have quite a few challenges from Helka Homba that are quite different from each other

(for example)

Fatalize

Otherwise most challenges would be Calvin's Hobbies'… whose challenges are much better than Helka Homba

orlp

2:26 PM

I didn't mean variety in terms of challenges

@Fatalize agreed, calvin is much better than helka

TimmyD

@NathanMerrill I'm with orlp on the promote-author-variety aspect. I also think it would be better if we narrowed the scope of the tour. Something like a tour of string manipulation challenges ... a tour of sequence and subsequence challenges ... etc.

orlp

10

Q: Map a list of indefinite size to a number!

It is well known, in the field of Mathematics studying infinity, that the Cartesian product of any finite amount of countable sets is also countable. Your task is to write two programs to implement this, one to map from list to integer, one to map from integer to list. Your function must be bij...

code-golf set-theory

Nathan Merrill

@TimmyD On my post, you'll see I've considered doing themes for future challenges, but this first one is unthemed.

orlp

I have an interesting solution to this that I can't seem to efficiently code

list -> number

add 1 to each element in the list, convert to binary, and strip the leading 1

Nathan Merrill

I'm not sure why we need author-variety. I mean, even if Calvin has the top 25 challenges (which I don't think is the case), what's the problem?

TimmyD

2:29 PM

@NathanMerrill Yeah, I see you added that a few minutes ago. I was going off of memory from last night's read before you edited it.

Nathan Merrill

@TimmyD :)

orlp

join by 2 to get a ternary number

zyabin101

So, I'm trying to run answers to this question on a test case, and see which number is the smallest for the test case.

The case is [0, 1, 2, 3, 0]

78977 exactly maps [0, 1, 2, 3, 0] to 652190.
78989 exactly maps [0, 1, 2, 3, 0] to 1681.
652190 / 1681 = 387.97739440809045

78989 is winning.

Wow, that's a large ratio.

Meanwhile, idk what to write for zyabinVI :/

New Main Posts

2

Q: The rice and chess problem

An indian legend tells the story of the alleged inventor of the chess game, who impressed so much the emperor of India with his game that he would get rewarded with anything asked. The man said he wanted to be paid in rice. He wanted a grain of rice for the first square of the chessboard, two fo...

code-golf math

Fatalize

@zyabin101 what even is ZyabinVI

zyabin101

2:42 PM

@Fatalize github.com/zyabinVI

My experimenting organization. :P

Currently in all of the definition, commitment and beta phases.

Definition is for, we don't have people in the org. Only me. Also, there is one failed invite.

Commitment is for, everyone can contribute something to be invited to the org.

Fatalize

yeah but

what's the point of it

the goal

zyabin101

@Fatalize Experimenting. :P

Fatalize

experimenting what?

zyabin101

@Fatalize Uhh, just experimenting.

A Nerd - I

Hi @NewMainPosts

zyabin101

2:47 PM

Hi @NewSandboxedPosts

Fatalize

why VI and not V or VII?

quartata

@orlp wish I had seen that challenge before Dennis did. I have a matlab program around here somewhere that works exactly the way his works and could have been easily ported to MATL

Nathan Merrill

CSS or HTML should have the ability to put some "flag" that disables the default stylesheet on browsers

quartata

oh well

zyabin101

@NathanMerrill @important?

Nathan Merrill

2:48 PM

no

no way

zyabin101

@Fatalize I chose whatever I wanted. :)

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Determine If a Challenge is Worth Answering I am a very casual code golfer, and don't often see posts until the show up in the "Hot Network Questions" sidebar over on StackOverflow. Usually, I'm late to the game, and since the only language I know is Python, there is little point in me answerin...

Nathan Merrill

I'm talking about the default "make links blue and underlined"

while there are reset stylesheets, they go out of date, and they require sending additional data for the website

simply having some sort of flag that says "Hey, don't apply any default styling to this page, only mine" would be awesome

TimmyD

@NathanMerrill That would also break many customized settings required for the blind or other hard-of-seeing, or for other things like screen readers or aggregators.

zyabin101

. ͜ .

Nathan Merrill

2:53 PM

@TimmyD maybe? It's not like users wouldn't be able to override it, and browsers wouldn't have to follow it in cases like that

El'endia Starman

TILA this madness:

Conway base 13 function

The Conway base 13 function is a function created by British mathematician John H. Conway as a counterexample to the converse of the intermediate value theorem. In other words, even though Conway's function f is not continuous, if f(a) < f(b) and an arbitrary value x is chosen such that f(a) < x < f(b), a point c lying between a and b can always be found such that f(c) = x. In fact, this function is even stronger than this: it takes on every real value in each interval on the real line. == The Conway base 13 function == === Purpose === The Conway base 13 function was created as part of a "produce...

ArtOfCode

@Adnan how are you still ahead of me in rep dernit?

TimmyD

@NathanMerrill Mmm, maybe I'm not understanding, then, because if the flag is optional, isn't that the same behavior that's currently present?

El'endia Starman

> In fact, this function is even stronger than this: it takes on every real value in each interval on the real line.

orlp

how do I reverse the order of arguments to a dyad in Jelly?

e.g. in the current link I have the current value a, and I want to calculate b^a for some argument b, but * calculates a^b

Nathan Merrill

3:06 PM

@TimmyD its similar to clear stylesheets. Right now, if I don't want all <a> tags to be underlined, I need to add a stylesheet that overrides the default. However, browsers don't have to use stylesheets. If I'm reading impaired, I may simply never apply stylesheets on a webpage.

Cyoce

now working on implementing encoding.rb.

Nathan Merrill

but the flag that says "don't apply default styling" could similarly be ignored if the user/browser wanted to. But right now, no browser supports such a flag, AFAIK

Adnan

@ArtOfCode ¯\_(ツ)_/¯

TimmyD

Ah, I see what you mean, now.

Cyoce

Ok, ruby question.

So I have an array a. Let's say I want to run eval on each element. The conventional way would be a.map{|x|eval x}, but is there a way I can pass the reference to eval? Like how I can do a.map(&proc)?

TimmyD

3:14 PM

PowerShell $a|%{([REF]$_)|iex}

I know that doesn't really help, I just wanted to contribute

:D

(whoops, forgot the [REF] tag)

Martin Büttner

A bit of shameless self-promotion. While trying to figure out test cases for the negative font challenge, I've come across an interesting combinatorics problem:

1

Q: Covering pairs with permutations

I'm looking for a set $S$ of (ordered) lists of $n$ numbers such that: Each number appears at least once as the first numbers. Each number appears at least once as the last numbers. Each possible ordered pair of adjacent numbers should appear at least once. Let's say I'm looking at the number...

graph-theory permutations hamiltonian-path

orlp

@Dennis is there really not an atom for the exclusive range [0, n)?

and if ’S is really the way to go, why didn't you make the exclusive range the default?

Dennis

Indexing in 1-based in Jelly. Having a built-in for [1, n] makes more sense than having one for [0, n) imho.

orlp

oh

why did you choose 1-based indexing?

Dennis

Because I wanted all indices to be truthy. Find returning 0 for not found has been useful more than once.

orlp

3:21 PM

Hrm, doesn't seem worth it IMO

Nathan Merrill

@MartinBüttner I'm unsure why you have the "first index" and "last index" restrictions

orlp

can always check for find == -1

Nathan Merrill

are they arbitrary, or is there something I'm missing?

New Main Posts

1

Q: Print the Nth non-palindromic number

Print the Nth non-palindromic number A palindromic number (in case you don't know) is a number which reads the same backwards and forwards (example, 11). The first 15 non-palindromic numbers are: 10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26. They can be found at the OEIS here. I co...

code-golf number sequence palindrome

0

Q: KOTH: TNT Run Challenge

This was inspired by a Minecraft mini-game. The rules are pretty simple: you run and jump around, and every block you step on disappears once you've stepped on it. The goal is to be the last one left. Your bot should be a complete program. It should accept input as a command line argument. The i...

king-of-the-hill

Martin Büttner

@NathanMerrill they don't seem to affect the problem, but I'm not sure how to prove it.

or maybe I am

due to the Hamiltonian cover equivalence

Dennis

3:23 PM

@orlp There really aren't any downsides to 1-based indexing I'm aware of. It's still modular, so 0 gives the last element, -1 the second to last, etc.

orlp

@Dennis cs.utexas.edu/users/EWD/transcriptions/EWD08xx/EWD831.html

Martin Büttner

@NathanMerrill anyway, the reason I have them is that in the underlying problem the first and last number form a unique "pair" with the start and end of the list.

Sp3000

@Dennis You could always pull a Mathematica and make 1 the first element, -1 the last element (and 0 a super-special-surprise)

Cyoce

For an editor named Brackets, you don't seem to handle indenting them very well. ಠ_ಠ

Nathan Merrill

? I didn't see that. For example, in your n=7 example, your 11234567 example makes the pair 7,1 (which exist in 66524371)

Dennis

3:25 PM

@Sp3000 Map 0 to HCF?

Sp3000

Dennis

So the "element" at index 0 is the type?

Nathan Merrill

hmmm, this seems related to the De Bruijn

Martin Büttner

@NathanMerrill the list is not cyclic

@Dennis "head", but yes

Nathan Merrill

@MartinBüttner then what do you mean by this?

Martin Büttner

3:28 PM

introduce a "start of list marker" (e.g. ^) and an "end of list marker" (e.g. $). now look for all possible pairs with those included (where having ^ second, $ first, or (^,$) are not considered possible)

trichoplax

> the challenge was to produce a simple-to-understand function which takes on every real value in every interval

Amazingly, the utterly crazy function is actually simple to understand

That's what I wasn't expecting...

El'endia Starman

hahaha, indeed :P

Adnan

@Dennis Can you please pull 05AB1E?

zyabin101

@Adnan "Okay."

Dennis

@Adnan Done.

Adnan

3:33 PM

Thanks :)

orlp

@MartinBüttner are you concatenating the numbers?

or is that just to condense the notation

zyabin101

I accidentally deleted most of the content of my Desktop! ;_;

Martin Büttner

@orlp condensed notation

okay, test cases done, does this look ready for posting?

5

A: Sandbox for Proposed Challenges

Between the Lines code-golfgraphical-outputnumber While doodling around on square-ruled paper the other day, I came up with the above negative-space font for digits. In case you haven't spotted it yet, the spaces between the above shapes yield the golden ratio 1.618033988749. In this challeng...

orlp

@MartinBüttner meta.codegolf.stackexchange.com/questions/9093/…

maybe refer to that?

rather than specifying image I/O yourself

Martin Büttner

the post is less than a day old, I'd rather specify it myself than refer to a consensus that is still in the process of forming ;)

mınxomaτ

3:37 PM

The voting culture on graphicdesign.SE is worse than on SO. And that's not easy.

Martin Büttner

(also even for normal I/O I always specify it myself, because I don't want people to have to go looking at the meta post)

PhiNotPi

I just wrote a programming version of the Navy Seals copypasta.

trichoplax

@MartinBüttner Looks good to me

Lembik

hi all

trichoplax

Hi

orlp

3:41 PM

1221
2332
3113

@MartinBüttner ^

El'endia Starman

I was reading this answer on Quora that debunks myths about Chile, one of which is that "Chile is very narrow". The answerer basically said "No, it's not that narrow; it takes three hours to go from one side to the other, and it's like that for a few European countries too." ...... As an American, that is very narrow. :P

Martin Büttner

@orlp see the last bullet point

orlp

@MartinBüttner wait, I didn't see the constraint that got dropped

what constraint?

Martin Büttner

that the lists are permutations with the first element repeated

clarified

orlp

ah I see now

Geobits

3:46 PM

@El'endiaStarman Ha, yea. It takes me three hours to get halfway through my state.

Martin Büttner

typography tag, yes/no?

Geobits

Hmm. It could apply to a few others I think.

Martin Büttner

there are 12 challenges with the tag

Lembik

algo/coding question. If I give you 9 letters and ask you to produce the longest word in a dictionary that can be made from a subset,how long does that take?

Geobits

Oh, I thought you were asking if you should create it.

Martin Büttner

3:49 PM

@Lembik 7 minutes

Sp3000

@Lembik With or without repeating letters?

Martin Büttner

@Geobits no I created it a while ago, just wondering if it's a bit of a stretch to apply it here. :)

Lembik

@MartinBüttner :) I meant is there linear time algo

@Sp3000 with

trichoplax

@MartinBüttner The challenge can be summarised as "output a font" so it seems to fit

(sorry about the extra pings)

Geobits

^

Martin Büttner

3:50 PM

okay, posted :)

zyabin101

@MartinBüttner I'll count down.

Three...

Two...

One...

Challenge!

Martin Büttner

or not

zyabin101

Nice try, @zyabin101. ಠ_ಠ

Sp3000

@Lembik By "made from a subset", do you mean you want words that use only that 9 letters, or that you're picking k <= 9 of the 9 letters and you want words using only those k letters?

Lembik

@Sp3000 words that use only that 9 letters but you don't have to use all of them

you need to use as many as possilbe

Sp3000

3:52 PM

So... is length of word the priority or number of different letters used?

Lembik

@Sp3000 length of the word

hmm..I suppose 9! isn't that large :)

Sp3000

Then can't you pass through each word, keeping track of which of the 9 letters have been seen as you go, breaking out if you see an unrecognised letter. If you make it to the end then the word uses only those 9 letters, at which point you check if it's longer than the current record?

Not sure if I'm misunderstanding

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