Re: [Haskell-beginners] Why is this function that slow?

On Thu, Jul 29, 2010 at 2:02 AM, Bryce Verdier wrote:

main :: IO () main = print . maximum $ [ x * y | x <- nums, y <- nums, is_palimdrome (x * y)]   where nums main :: IO ()

This version of main is faster for me. main :: IO () main = print . maximum $ [ x * y | x <- [100..1000], y <- [100..x], is_palimdrome (x * y)] David.