Python Optimization

mukesh tiwari mukeshtiwari.iiitm at gmail.com
Mon Feb 15 18:08:30 CET 2010


On Feb 15, 1:07 am, Steve Howell <showel... at yahoo.com> wrote:
> On Feb 14, 11:52 am, Mark Dickinson <dicki... at gmail.com> wrote:
>
>
>
>
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> > On Feb 14, 4:53 pm, mukesh tiwari <mukeshtiwari.ii... at gmail.com>
> > wrote:
>
> > > Hello everyone. I am new to python and previously i did programming in
> > > c/c++.Could some one please help me to improve the run time for this
> > > python program as i don't have idea how to optimized this code.This
> > > code also seems to be more unpythonic so how to make it look like more
> > > pythonic . I am trying for this problem(https://www.spoj.pl/problems/
> > > FACT1/).
> > > Thank you
>
> > One other thing:  in the 'brent' function, you're setting m to
> > randrange(1, n).  What's the purpose of this?  It looks to me as
> > though m controls the number of Pollard-Rho iterations that are
> > clumped together at one time (before doing a gcd operation), and using
> > a random number for this doesn't make a lot of sense to me.
>
> The randomness also makes the algorithm a little buggy.
>
> I tried this input:
>
> 37^5 41^5
>
> Usually I get the right answer.  Other times I get this:
>
> 37^5 41^3 1681^1
>
> And occasionally it appears to get into an infinite loop, which
> definitely could be a cause of "slowness." :)

Thank you all for help. I will try to improve these short comings.



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