Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
I am surprised that nobody pointed out how this is related to Golf: Embedded In Order and (Golf) Ordered Combinations. From there we can define two helper functions:
sub c{@r='';@r=map{$c=$_;map$c.$_,@r}@_ for 1..shift;@r} sub i{($t=pop)=~s/./.*\Q$&/gs;pop=~/$t/s}
which have bodies of 34 and 49 respectively. Plus 14 for the surrounding pieces. So we are at 97 characters. And then it is easy to finish off with
sub assemble { my$n;{for(c($n++,map{split//}@_)){$v=$_;map{i($v,$_)||next}@_;return$_ +}redo} }
whose body has 76 characters for 173 characters. (Note that I added 5 characters to allow it to be called twice without retaining state.)

This is a theoretically correct solution, but be warned that it is not polynomial either in speed or memory requirements. So it isn't a very useful solution.

In fact it raises questions about what a solution is. This will not run on my machine with either of the original data sets. I do not have such a machine to test on, but I do not believe that even if you try to compile Perl on a 64-bit machine with a very large amount of memory that it will succeed. So while the algorithm is fine on paper, it cannot work on the stated data set.

Is a correct algorithm that will not finish on practical machines considered a solution?

My test data is:

print assemble(qw(oa af wf wa));
which cheerfully finds "owaf" as its answer.

In reply to Re (tilly) 1: (Golf) Fragment Reassembly by tilly
in thread (Golf) Fragment Reassembly by MeowChow

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



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others examining the Monastery: (4)
As of 2021-12-08 22:16 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    R or B?



    Results (36 votes). Check out past polls.

    Notices?