Thanks for the update

I cannot read Haskell so I was not sure how the factoring was done. Going through the example it seems like tmoertel was just factoring like terms. If the code does further factoring (school days division) then I am surprised that it can loop through that fast!

If you take a look at my scratchpad I tried ikegami's logic on gcd. I added a condition to check for values == 1 to save an extra GCD. I also did not have the Math module he was using so picked up another one.

This one takes about 9 minutes. It would be interesting to see what will happen if we apply BigInt from here onwards!

I am also curious to see the runtime of the prime factor approach. I shall try hv's code to see how fast it runs. If I remember correctly Euclidean algo for GCD is O(n+log n) and prime factorization is NP-complete. For small values, prime fact is a breeze but the complexity does not change so i shall let you know when i get around testing the runtime for it!

cheers SK

In reply to Re^5: Algorithm for cancelling common factors between two lists of multiplicands by sk
in thread Algorithm for cancelling common factors between two lists of multiplicands by BrowserUk

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.