Hey, they still have the 9 9's problem that nobody has ruined yet.

Good luck getting it to run in under 1 minute. :-)

Well, I got it running in about one hour (on my ancient 200MHz 486), which is better than the few days I thought it was going to take at first :-)
(So if I run it on some new fangled 12Ghz system, it might break a minute,
right? ;-)

What matters, of course, is how many iterations it takes, and what it came down to (in my solution) was how many ways to order the 4 operators eight in a row (4**8 => 65536), times how many ways to put 9 duplicate balls in eight different buckets (which is alot, until I realized each bucket only needs to hold at most two balls, and then I filtered most of the redundant and invalid combinations from that which resulted in only 64 combinations), which resulted in about 4 million iterations of the main loop.

I'm not going to spoil the answer here (and I hope I haven't given away too much already, and only provoke "what the hell is he talking about?" responses from most people), since the add-a-gram has been done to death both here and on comp.lang.perl.misc, and I'd hate to see the same done to the 9 nines, but anyone that can filter the problem space even further has my ++'s...(hmm, wonder if I can get a job in Cambridge, MA now...)

Update: Damn! While I took a completely different approach, it'll never beat tilly's (and I suppose its not even worth pointing out that my implementation was broken, and that the corrected version will take about 2 hours to run :-)

In reply to Re: Re (tilly) 2: Add-A-Gram Performance by runrig
in thread Add-A-Gram Performance by smgfc

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.