Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
As the other monks observed, the most concise solutions will probably use regular expressions. When looking only at the length of strings, the set of amounts you can represent using $6, $9, and $20 bills is /^(.{6})*(.{9})*(.{20})*$/, or equivalently for our purposes, /^(.{6}|.{9}|.{20})*$/. Now, to get the function arguments into such a regex and find the longest string that doesn't match is the creative part...

Here are my two 48-character solutions:

$"="}|1{";$_=1x999;chop while/^(1{@_})*$/;length


And if it weren't for a bug I just found in alternations within negative lookaheads, I'm pretty sure this would be equivalent, giving me 46 characters:


They all use basically the same idea, can you think of a different approach? As I mentioned in the original post, these work for all instances where (a) the solution is 999 or less, and also (b) the arguments are each less than 32k (because they are used in regex quantifiers).


In reply to Re: Golf: Buying with exact change by blokhead
in thread Golf: Buying with exact change by blokhead

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others drinking their drinks and smoking their pipes about the Monastery: (9)
    As of 2018-06-19 13:40 GMT
    Find Nodes?
      Voting Booth?
      Should cpanminus be part of the standard Perl release?

      Results (114 votes). Check out past polls.