I think I have to rule the 40 character solution out of
bounds on the basis of the fact that you are walking
through the numbers and testing whether each is prime.
This loses the central idea of Eratosthenes which
is that when you find a prime you immediately mark off
Basically you reversed the role of the 2 loops.
The 60 character answer is impressive. However it seems to
scale quadratically. I must confess that I don't see
why it is scaling quadratically, but it clearly
is. So unless you can explain why this is a bug in Perl,
I am going to have to call this a solution to only the
I now understand why your 60 character solution is scaling
slowly. It actually scales like O(n*n/log(n)), and it is
because you are walking all of the primes with each strike
rather than just the multiples of the current prime. So
it definitely only is a solution to the first
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
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:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- 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
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||