The Nineteenth Byte

mınxomaτ

23:00

@Pietu1998 Also: nordsec.oulu.fi

ASCII-only

> logging into devices using their default, factory-set passwords

mınxomaτ

It's soon, but the schedule shows some quality content.

Pietu1998

@mınxomaτ That seems cool. I doubt I can make it this year, but would definitely be a good idea in the future

mınxomaτ

Yep.

ASCII-only

@ASCII-only D: Looks like those devices need a random default password

Wheat Wizard

23:04

@Beta Decay I believe I have completed your bounty: codegolf.stackexchange.com/a/97005/56656

Dennis

@LuisMendo Done.

ASCII-only

@WheatWizard looks at screenshot So that's who Wheat Wizard is

New Main Posts

2

Q: Does the code terminate?

This is a code golf challenge I thought of with a mathematical bent. The challenge is to write the shortest code possible such that is an open question whether or not the code terminates. An example of what I mean could be the following piece of python code, adapted from an anwser to this cs stac...

noɥʇʎPʎzɐɹC

@mınxomaτ no wonder all my tor exit nodes are located in the netherlands

@TuxCopter Also from the breached FTP server:

~
> cat olegon.ru_passwords.txt
At olegon.ru and inima.org
you can use code 089098675@Ienrf!

mınxomaτ

And Romania. They have dirt cheap Gigiabit internet.

ASCII-only

23:13

@NewMainPosts Doesn't that terminate instantly

noɥʇʎPʎzɐɹC

@mınxomaτ wat

Pietu1998

@ASCII-only this, I think it should be while not

ASCII-only

@Pietu1998 Yeah

DJMcMayhem

I think your logic in the sample code is backwards. Don't you want while not is_perfect(n):...? — DJMcMayhem 55 secs ago

Cool challenge though!

Destructible Watermelon

npw to implement the most important char in my language

%

imagine if someone proved the collatz conjecture just to make the pyth answer invalid

Qwerp-Derp

23:22

Can I shorten this down?

p=lambda n:1if 0not in[n%x for x in range(2,n)]else 0

ASCII-only

@Qwerp-Derp p=lambda n:0not in[n%x for x in range(2,n)]

Destructible Watermelon

ninja'd

also

lambda n:all(n%x for x in range(2,n))

if 0 is there, it evaluates to false, else true

Luis Mendo

@Dennis Thank you!

Pietu1998

@DestructibleWatermelon g=lambda n,k=2:n==k or g(n,k+1)and n%k

Qwerp-Derp

Not sure if this works for goldbach conjecture

p=lambda n:all(n%x for x in range(2,n))
g=lambda n:g(n+2)if n in[b+c for b in range(n)for c in range(n)if p(b)and p(c)]else 0

DJMcMayhem

23:31

@Qwerp-Derp Your first lambda is wrong

No wait, that's a prime tester?

Qwerp-Derp

First one is prime tester

second one is goldbach

DJMcMayhem

Nvmd then

Destructible Watermelon

hmmmm

Pietu1998

Since you need to assign the lambda to a variable the recursive one is shorter

p=lambda n,k=2:n<=k or p(n,k+1)and n%k

or in your case, even this works

p=lambda n,k=2:n<=k or n%k*p(n,k+1)

Also, you can replace and with *

@Qwerp

Qwerp-Derp

Yup

Conor O'Brien

23:35

@quartata I turned off toaster settings and my frame-rate doubled.

quartata

As in, just the stability config?

Eᴀsᴛᴇʀʟʏ Iʀᴋ

no, just his TF2 graphic settings

quartata

@EᴀsᴛᴇʀʟʏIʀᴋ I'm talking about which graphics config he's using

There's stability and toaster

Eᴀsᴛᴇʀʟʏ Iʀᴋ

?

Qwerp-Derp

What about the twin prime conjecture?

DJMcMayhem

23:37

I don't think that would work for this challenge

Conor O'Brien

@quartata I went as low as I could in terms of framerate.

quartata

Which graphics config are you using? Are you using Chris's?

Qwerp-Derp

How can I shorten g?

Pietu1998

@Qwerp-Derp You need something that isn't of the form "it's unknown if infinite solutions exist", but is of the form "it's unknown whether this applies to everything"

Qwerp-Derp

True

Pietu1998

23:40

g=lambda n:g(n+2)if[0for b in range(n)if p(b)*p(n-b)]else 0

should work

Conor O'Brien

@quartata idk

none anymore

quartata

Wow, your computer makes no sense

I can only blame Windows 8.

If it was just the toaster config causing problems I'd say that's because of CPU issues

But

Same hardware, you're getting 70 fps I'm getting 350

Conor O'Brien

dude

quartata

The only difference is OS

DJMcMayhem

Oh geez I'm not sure what to do for this review

quartata

23:41

It's fairly obvious

Conor O'Brien

my computer is haunted, you should know that

DJMcMayhem

I'm leaning towards reject but not sure what reason to pick

Conor O'Brien

my bro gets 2x better frames than I do, identical computers

quartata

@DJMcMayhem Reject; clearly conflicts with author's intent

Qwerp-Derp

@Pietu1998 So it basically fills up an array with 0's, if I understand correctly?

Pietu1998

23:44

It makes an array with a 0 for every prime b, for which n-b is also prime, i.e. there exists c=n-b which is prime and n=b+c

Also, if you're not interested in the return value, you could do

g=lambda n:not[0for b in range(n)if p(b)*p(n-b)]or g(n+2)

Downgoat

@NathanMerrill ;_; y u put happy face Q___Q

quartata

@Downgoat Thought you were trichoplax for a second; was super confused

Downgoat

:/ I can use avatar confusion to my advatage so people will start taking me seriously :O :D

Conor O'Brien

I think they effectively switched

Helka Homba

Anyone else's internet affected by the cyberattacks?

noɥʇʎPʎzɐɹC

23:48

@mınxomaτ how did you get your skill level

@HelkaHomba Mine!

Like, a lot

Pietu1998

@Qwerp There might be a problem. The code (including the original) also considers the pair (1,n-1) which matches for e.g. n=8. This might miss counterexamples, so the range in g should probably be range(3,n).

noɥʇʎPʎzɐɹC

I'm using Tor though so everything works well

80% of sites are down for me.

Pietu1998

No problems in Finland \o/

mınxomaτ

@HelkaHomba Switch your DNS servers to OpenDNS. They have no downtime.

noɥʇʎPʎzɐɹC

@Pietu1998 diversity counter overflowed

mınxomaτ

23:49

Keep in mind that your ISP might still ignore your DNS settings

Pietu1998

@noɥʇʎPʎzɐɹC use bigint

Helka Homba

I'm ok now but my internet was non existent last night

noɥʇʎPʎzɐɹC

@Pietu1998 too small

Pietu1998

@noɥʇʎPʎzɐɹC that's what she said

noɥʇʎPʎzɐɹC

@HelkaHomba Tor Browser, see PSA to the right

Pietu1998

23:53

chat dies

Conor O'Brien

basically

Pietu1998

(or, everyone else's internet dies)

Conor O'Brien

btw nice to see you around again. (at least, it seemed like you were absent)

mınxomaτ

I see how that can become a problem during election day btw.

noɥʇʎPʎzɐɹC

@mınxomaτ you are so right

Pietu1998

23:54

oh right, usa uses electronic voting now

noɥʇʎPʎzɐɹC

also ESTONIA. If you can intercept votes without people noticing, you got 52% of the electorate.

Downgoat

@Pietu1998 WAIT WAT

Pietu1998

I can see some bigger problems with the electronic voting though

ASCII-only

@noɥʇʎPʎzɐɹC 0/10 Tor is bad just use OpenDNS

Pietu1998

possibly related to some statements by a certain candidate

Downgoat

23:55

THIS IS VERY BAD IDEA BRB EXERCISING DEMOCRACY

mınxomaτ

@Pietu1998 Not that, I mean information. Not only the internet, but TV networks rely on data now. No more pumping microwaves into the air, pretty much all internet-based (or at least dependent).

DJMcMayhem

Huh. Just got the "pundit" badge.

noɥʇʎPʎzɐɹC

@ASCII-only meh, ma browser is slower than Tor

Pietu1998

feels old for still using DVB-T

ASCII-only

@noɥʇʎPʎzɐɹC ma?

Helka Homba

23:55

@Pietu1998 Do we? I've never voted online, always by absentee ballot. And I imagine electronic voting machines that do connect online can save their vote data locally.

noɥʇʎPʎzɐɹC

@ASCII-only my but corrputed on purpose

mınxomaτ

@Pietu1998 Also carried over the internet from the network to the transmission station for some part.

ASCII-only

@noɥʇʎPʎzɐɹC How is it slower than Tor

noɥʇʎPʎzɐɹC

@ASCII-only dunno, but it is slower

@mınxomaτ so what have your automated tools found recently?

mınxomaτ

Many things.

You know, NDA and stuff.

Pietu1998

23:58

@mınxomaτ I live close enough to the news studio that the signal probably doesn't leave the studio area before microwaves

noɥʇʎPʎzɐɹC

@mınxomaτ list ONE major recent non false positive. That they denied you and you didn't NDA.

Also why do they care about NDAs anyways?

Silly laymen

mınxomaτ

@Pietu1998 Fine, but field reporters and mobile stations send their data over bonded 4G. Knock the mobile phone provider's DNS or NAT offline.

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