[Haskell-cafe] Is this haskelly enough?
westondan at imageworks.com
Tue Jul 17 19:00:01 EDT 2007
Bjorn Bringert wrote:
> import Data.List
> maxsubarrays xs = maximumBy (compare `on` sum)
> [zs | ys <- inits xs, zs <- tails ys]
I love this solution: simple, understandable, elegant.
As a nit, I might take out the ys and zs names, which obscure the fact
that there is a hidden symmetry in the problem:
maxsubarrays xs = pickBest (return xs >>= inits >>= tails)
where pickBest = maximumBy (compare `on` sum)
-- NOTE: Since pickBest is invariant under permutation of its arg,
-- the order of inits and tails above may be reversed.
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