Discussion between proud haskeller and AboveFire

Stack Exchange

19:58

3

A: Two Makes All The Difference: Robbers

BrainFuck , 504 bytes No one should ever need to analyse a brainfuck code. This is a modified version of an earlier code, but any change in a Brainfuck code make a big difference in the output. I use the Interpreter at http://esoteric.sange.fi/brainfuck/impl/interp/i.html to test my code. Good L...

AboveFire

@RedPanda My code does have a structure. At least it's not random! Good luck!

proud haskeller

are there any unprintables in the output?

AboveFire

@proudhaskeller Yes sorry about that, I'll edit the post, there is a bunch of character STX(ASCII 2) and EOT(ASCII 4)

proud haskeller

but where are they? i don't have the information

AboveFire

@proudhaskeller I am working on it right now :)

proud haskeller

19:58

your changed code without the unprintable characters starts with "}}}\}}}", but the one with them starts with "(2)}}}(2)}}}", mssing the "\". can you double check this? there may be errors in other parts too.

AboveFire

@proudhaskeller I tried to use bold to make the chars clearer, but "\" does not appear in a citation. Thanks for pointing this out

proud haskeller

this is evil. i managed to get to a very similar input, but i dont get where all the seemingly-random unprintable characters come from

i got to this code: ++++++++++[->++++++++<]
>>++++++[-<---------->]
<-------[----------->>>-<<+<[-->->+<<]]>>>+<<?>>>+++[->++++++++++<]>(<)++
.<+++++++++[->>>>>>>++++++++++<+++++<++++++++++++++<++++++++++<+++++<++++++++++<<]
++++++++++>>+++++...>++>++>-->+>(>)++++<<<<<<<.<<<
[->>>>>>.<<>>>>>.<<<<<.>>>>>.<<<<<>>>.<<<<.>>>>>.<<<<.>>>>>.<<<<<.>>>>.<<<<<.>>>>.<<...>.<<<<<<]>
[->>>>>.<<...>>>.<<<<.>>>>>.<<<<...>>>>.<<<<<.>>>>.<<...>.<<<<<]>
[->>>>.<<>>>>>>.<<<<<<..>>>.<<<<.>>>>>.<<<<?>>>>>>.<<<<<<.>>>>>>.<<<<<<?>>>>.<<<<<.>>>>.<<...>.<<<<]

new additions are wrapped in parentheses

*to a very similar output, sorry

AboveFire

Actually, you got it

check this site for unprintables : asciivalue.com/index.php

Congratulation

proud haskeller

but... but...

AboveFire

but?

proud haskeller

20:06

where do the (50, (7), (12) and (24) come from?

*(5)

AboveFire

do you use esoteric.sange.fi/brainfuck/impl/interp/i.html?

proud haskeller

no

why?

does it operate differently?

AboveFire

I don't think so

let me check something

I think the special chars appeared when I copied my edit to create another edit -.- it may be part of stackexchange formating

sorry

proud haskeller

its fine

just update your post and then i can post my answer

AboveFire

I hope I did not cause you to search to much

I updated

proud haskeller

20:13

its fine

i basically thought to myself "it doesnt make sense that the pattern changes" and i came to ask you

AboveFire

alright, it is quite something to analyse a brainfuck code

btw I saw your answer, you can't bold in a code box

xD I learn't it 2 hour ago

you also let your "?" in the code

proud haskeller

ok thanks

are you the one who voted me up?

and hello @Al

@AlexVanLiew i mean

AboveFire

Yeah I am the one who voted you up :)

proud haskeller

20:28

btw i voted up your answer, like, 6 hours ago :) it looked like magic at the time

AboveFire

xD yeah I thought that using my code a cookie answer would make it real weird, with a lot of unused code and some weird loops

did you try the J answer?

proud haskeller

no i dont know j

AboveFire

Oh okay, I don't know either but I tried it anyway. I hope I will never have to touch J in my life

proud haskeller

all the time i tried to crack your code i thought these places were you put the <<<>>> must be something. it was weird :)

AboveFire

yeah, actually it was because I used an earlier code than in my code a cookie answer

proud haskeller

20:34

yeah the J answer looks mysterious, with using only like 5 characters in the code

AboveFire

I did not see th <> until after I posted, and then I let it there to be confusing

proud haskeller

yeah it was :)

AboveFire

yeah J is a weird array based language. I successfully achieved the result of the changed output, but in 9 characters -.-

I forfeited soon after

proud haskeller

this is more than i would hope to do

AboveFire

it took me an hour to just understand the J basic, but then I figured I could not possibly understand the twist

proud haskeller

20:37

learning new languages on golfed/obscured code like you find on this site can be not such a good idea

exactly

i think having a brainfuck submission where you need to add a loop instead of ><.+- characters will be very hard

just have a random loop crossing where the previous loops were, it would be hard as it can be

AboveFire

yeah, but it could be analysed, because you must be sure it is not an infinite loop

proud haskeller

think of [++([)++>++>>>-<<<<]---(])---

you can make it to be not infinite

AboveFire

yeah

you would need a print thought

proud haskeller

well, anything could be analyzed, technically

just brute force

AboveFire

yeah, brute force of brainfuck is not that hard because there is only 5 possible characters

proud haskeller

20:42

there are still 10000 possibilities

you're right though, it is easier than other languages

AboveFire

if you want to make a submission, make sure it is long or long to execute, because bruteforce can be made programmatically

proud haskeller

well i dont think yours was too long to brute force

AboveFire

nope

I don't know why nobody tried it

proud haskeller

maybe whoever would try didnt see it yet

AboveFire

now that I think about it, you can't really bruteforce it because you would be stuck in an infinite loop

proud haskeller

20:44

oh right

i guess you could check for these though

AboveFire

yup like a 5 sec timeout

but that would make the bruteforce a lot longer

proud haskeller

once it prints more than the changed output you can terminated it anyway, regardless if its an infinite loop

AboveFire

yeah

proud haskeller

or better, once it prints something different than the character it should

AboveFire

but if the loop does not print, you are stuck

proud haskeller

20:46

well i guess you can have a 5 second timeout too :)

AboveFire

yeah :)

proud haskeller

so i see you are new to this site

how it's going?

AboveFire

Well, I did not have an account, but I read the challenges for a year or so

it's going well, I finally have the right to comment :p

proud haskeller

it feels nice right?

AboveFire

yeah

proud haskeller

20:49

nostalgic

well, good luck

nice talking to you

AboveFire

thanks

I liked talking to you too

I am thinking about posting a submission in Shakespear, but I can't find a way to make the output change with 2 characters

proud haskeller

lmao

AboveFire

the variables are all shakespear characters and everything is a word, I can't find something, even if I do, it will not be hard to find the change

well well, maybe I'll check it later, I need to do something else xD

Transcript for

Discussion between proud haskeller an…