[Haskell-cafe] haskell in online contests

Bulat Ziganshin bulat.ziganshin at gmail.com
Fri Nov 27 15:06:18 EST 2009

Hello vishnu,

Friday, November 27, 2009, 10:41:37 PM, you wrote:

it's just false assumption that you should got speed comparable to
other languages. haskell is lazy and ghc has much less mature compiler

> Ive just started learning haskell pretty recently and Ive been
> trying to solve some online contest problems as part of this
> exercise. However, Ive been having almost no success. For various
> reasons my answers almost always are too slow. I recently stumbled
> across this link which was quite useful
> http://www.haskell.org/haskellwiki/SPOJ. This helped me speed up
> some of my programs where input was slowing me down.

> But being a noob, to a large extent I don't even know why my
> programs are slow sometimes or how to tell what makes them slow.
> I've been attempting problems from www.codechef.com (which uses
> SPOJ) in actuality. Because I have an admin account I can actually
> compare my solution against others there (which are almost always in
> C/C++ or Java) to try and figure out if Im missing a trick. Recently
> the problem I picked up was
> http://www.codechef.com/problems/DDILEMMA/ and I worked through
> solutions that just don't seem to be fast enough. I looked at
> successful submissions in C++ and JAVA which seem to do mostly what
> I'm doing (ofcourse there are differences because those are
> imperative languages and I might be misunderstanding things.). I've
> got my program, test input that I generated, cost center analysis
> all up on this page.
> http://moonpatio.com/fastcgi/hpaste.fcgi/view?id=5120#a5137
> I've been getting some significant help from the #haskell channel
> but unfortunately this hasn't helped me break the barrier I need to.
> So I was wondering if someone would be kind enough to help me
> understand the profiler output and help me understand how to improve performance in cases like this
> thanks

Best regards,
 Bulat                            mailto:Bulat.Ziganshin at gmail.com

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