0 _      _ 3
   \    /   
1 _ \  / _ 4
   \ \/ /   
2 __\/\/__ 2
    /\/\    
3 _/ /\ \_ 0
    /  \    
4 _/    \_ 1

[download]

That's not an option. Crossing have to be pairwise, I.e if 0 crosses over to 1, 1 must also cross over to 0. So you have to wire it as 

0 _____  _____ 3
       \/    
1 ___  /\  ___ 4
     \/  \/  
2 _  /\  /\  _ 2
   \/  \/  \/
3 _/\  /\  /\_ 0
     \/  \/  
4 ___/\__/\___ 1

[download]

Think of it as physical wires, and all you can do is to exchange two adjacent wires.

I'll point masak to this thread so he can object if I wrote something wrong.

Perl 6 - the future is here, just unevenly distributed

In reply to Re^4: The Perl 6 Coding Contest 2012 by moritz
in thread The Perl 6 Coding Contest 2012 by moritz

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.