# Introduction

For this Cops/Robbers challenge, the cops will write output-producing programs and interweave them together. It is the robber's job to pick apart the cops' programs to produce the desired outputs.

# Robber rules

Robbers will try to find the different programs that people post in submissions to the cops' thread (linked above). If a robber solves a cop's code, they must post the separated programs and match them with their outputs in an answer here and post that they have cracked the code on the cop's answer.

# Scoring

There are two components that are added together when scoring a cracked submission.

• 2 to the power of the number of different programs used in the cop's answer
• Round the number of bytes in the interweaving down to the nearest power of 2.

For example, if a robber cracks TIliGoEnR as being TIGER and lion, then the robber receives 2^2+8=12 points.

The winner of the robbers' challenge will be the person with the most points after a sufficient period of time for people to participate.

(Who wants to help with a snippet?)

# Vitsy, 12 points

'o'2\I/NO


Try it online!

a5F\aZ


Try it online!

The NaN in NaNo was a dead giveaway.

The obvious way to push NaN would be to divide 0 by itself, 2\I pushes the input length (0) twice, / performs division, and N prints a float.

We're left with printing o, and 'o' is a string literal that O prints.

Whatever characters were left had to belong to the other program. In fact, a pushes a linefeed, 5F the factorial of 5 (120), \a turns that into 120 linefeeds, and Z prints the entire stack.

• So fancy, so beautiful. Well done. +1 Nov 23, 2015 at 23:01

# BitShift, 2^2 + 64=68 points

0101100110110101001001010110111011101110111011101101010


prints ! ?

1011101110111011101110110101000000000110010101101101010


prints ? !

### Code

0101100110110101001001010110111011101110111011101101010 # '! ?'
01011001101101010 # '! '
0101              # XOR 0 with 128
# Making current value 128 (1000 0000)
10            # Bitshift 1 to left making 10000000 -> 01000000
01          # Bitshift 1 to left making 01000000 -> 00100000
101       # XOR 00100000 with 1 making it 00100001
101010 # print 00100000 which is binary for !
010010101         #
010               # XOR 00100001 with 1 making it 00100000
010101         # print 00100000 which is binary for <space>
10111011101110111011101101010  # '?'
101               # XOR 00100000 with 1
1              # Bitshift 1 to left making 00100001 -> 01000010
# This gets repeated till 01000010 becomes 0111111
101010                # print 0111111 which is binary for ?



I will add some description later(split the code in the parts that print individual parts)

• Can someone explain how to calculate the score I don't quite understand the calculation Nov 23, 2015 at 15:42
• Well done. The score is calculated by 2^programs + 256/bytes=points. In this case it's 2^2 + 256/128=6 points. I think this will be edited though, because as it is now, fewer byte count programs receive a higher bonus for robbers. Which feels off Nov 23, 2015 at 16:16
• @Bas As of yesterday, that was changed. Nov 23, 2015 at 17:05

# PHP, 68 points

$c=tR;$h=s;$c=$h.$c._.$h.plit;echo$c($h);


Output: Array

echo quotemeta('^/]'.co.'[$');  Output: \^/\]co\[\$

I like this submission, because it relies on a few lesser know features - one might say misfeatures - of PHP. PHP allows function references to be assigned to variables, so for example:

$f = function($a, $b) { return pow($a, $b); }; echo$f(2, 4);


would do exactly what you expect. As would:

$f = pow; echo$f(2, 4);


...except it's not doing what you think. $f = pow does not assign a function reference to $f (that would make too much sense, right?), but rather the string 'pow'. The implication is that any string may be used as a function call, if it represents the name of a defined function. Bad code waiting to happen. I don't even know why you'd want to allow this.

Another misfeature of PHP, is that function names and keywords are case-insensitive. I wish I were joking. So echo pow(2, 4), ECHO POW(2, 4), and EcHo PoW(2,4) are all functionally equivalent.

The last misfeature on showcase is that whenever an array is typed as a string, such as for printing, the result is always the amazingly helpful string Array. Take a moment to reflect on the fact that someone actually did this deliberately.

So in the first program, @insertusernamehere builds up the string stR_split, this string is used as a function reference (which, for reasons above, actually works), and the result, an array, is output.

• Nice work that comes with a great explanation. :) Nov 25, 2015 at 10:05

# Ruby, 68 points

First:

p %w(b n n s)*?a%?}


Second:

w,=?(.ord,40,?);"jivivi{2".bytes{|b|putc b-w}


It followed pretty naturally from working out the end, with putc.

• Whoops, I had a slightly different intended solution with one more weird syntax trick, but I guess I'll keep that in my back pocket for another challenge. Well done! Nov 25, 2015 at 18:51

# JavaScript, 68 points

### First program

Output: ffttff

(![]+[])[+[]]+(![]+[])[+[]]+(!![]+[])[+[]]+(!![]+[])[+[]]+(![]+[])[+[]]+(![]+[])[+[]]


### Second program

Output: 1010

+!![]+[+[]]+(+!![])+(+[])


### Interweaving

+     !!    []             +                [    +[]]          +      (+     !![])                 +     (+[])
(![]+  [])[  +[]]+(![]+[]) [+[]]+(!![]+[])[ +[]]    +(!![]+[]) [+[]]+  (![]+     [])[+[]]+(![]+[]) [+[]]


# Java, 132 points

First program:

interface c{static void main(String[]g){System.out.println("Hell"\u002bg.length);}}


Second program:

class i{public static void main(String[]n){System.out.print("Bye!\n");}}


The first program outputs Hell0 and the second program outputs Bye!

• Ah, I was an hour too late. Good job. Nov 23, 2015 at 19:54

# Javascript, 132 points

### Program 1

var x;{;alert((f=>(f.reverse(f+~~f,Math.pow(2,Math.E))))(new Array(99).fill(0).map((x,i,f)=>i/3)).join("").replace(/../g,""))}


try{"function";Object.keys(f)}catch(e){f=s=>!s?f(1):"";alert(f(f(f(0/0) +f(7/5)))+f(f)+${f}.split.map(e=>e.charCodeAt()*23))}  Whew. This was terrible. After a lot of debugging I found out that after calling (parts of) the 2nd program, it wouldn't run again. This is because the global variable f was still assigned. Because of f being assigned, the try/catch didn't fail on Object.keys(f). I don't know if this is a sneaky trick or unintentional but it caused me a headache. Also, I believe the output of the first program is platform specific. /../g removes all characters on my machine, because of the regex . which means any character. Escaping it with /\../g works however, I hope someone can shed more light onto this. Also, my output is prone to rounding errors, perhaps some global javascript variable can change this? Output 32666666666666643233333333333336323166666666666668313333333333333231306666666666666830333333333333323029666666666666682933333333333332292866666666666668283333333333333228276666666666666827333333333333322726666666666666682633333333333332262566666666666668253333333333333225246666666666666824333333333333322423666666666666682333333333333332232266666666666668223333333333333222216666666666666821333333333333322120666666666666682033333333333332201966666666666668193333333333333219186666666666666818333333333333321817666666666666681733333333333332171666666666666668163333333333333216156666666666666615333333333333341514666666666666661433333333333334141366666666666666133333333333333413126666666666666612333333333333341211666666666666661133333333333334111066666666666666103333333333333410966666666666666933333333333334986666666666666683333333333333487666666666666677333333333333337666666666666667633333333333333656666666666666753333333333333354666666666666674333333333333334366666666666666533333333333333353266666666666666523333333333333352166666666666666713333333333333331066666666666666603333333333333330  This was tested on chrome 46 (my only browser), Windows 7. I hope this is still a valid submission, despite the different output • There was a slash in there, I don't know how it was missed. Good job, though! This is correct. I will update my submission when I am not on mobile ;) Nov 25, 2015 at 15:15 # JavaScript (ES6), 68 points ### Program 1 alert((c=>c.replace(/[a-z]/gi,a=>String.fromCharCode(("Z">=a?90:122)>=(a=a.charCodeAt(0)+13)?a:a-26)))("fvzcyr"))  ### Program 2 alert((b=>b.replace(/[a-zA-Z]/g,s=>String.fromCharCode(s.charCodeAt(0)+(s.toLowerCase()<'n'?13:-13))))("gbnfg"))  ### Interweaved programs  alaelretrt((((cb=>c=>b.replace(/.replace[a-(/[azA-Z]-z]/gi/g,a,s=>String=>String.fromCharCode(s.fromCharCode(("Z">=a.charCodeAt(0)?90:122)>=(a=a.charCodeAt(0+(s.toLowerCase())+13)?a<'n'?13:-13:a-26)))))))((""gfvbznfcyrg"")))) al e r t ( ( c =>c .replace (/[a -z]/gi ,a =>String .fromCharCode(("Z">=a ?90:122)>=(a=a.charCodeAt(0 )+13)?a :a-26))) ( " fv z cyr " )) a l e rt ( ( b =>b.replace(/ [a- zA-Z] /g ,s =>String.fromCharCode(s .charCodeAt(0) +(s.toLowerCase() <'n'?13:-13 )))) ( "g b nf g " ))  This would've been a lot harder, had the cop torn apart the keywords. ;) • I manually interwove it and got lazy, but good job. I tried being sneaky. Oh well. Actually thank you for cracking this one because I lost The original unweaved programs somehow. Nov 30, 2015 at 23:35 # PHP, 24 points Program 1 print!0;  Program 2 print!$x;


Program 3

print print'';


Tested with http://sandbox.onlinephpfunctions.com/.

# Python 2, 320 points

print "This"
print "hello"
print "well"
print "no"
print "alas"
print "but"
print "oh"
print "done"