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Bounded knapsack problem
import Data.List
type Weight = Int
type Value = Int
type Item = (String,Weight,Value)
type Pack = ([String],Weight,Value)
knapsack :: (Pack -> Bool) -> [Item] -> [Pack]
knapsack f = sortBy (value) . filter (f) . map (foldl (pack) ([],0,0)) . tail . subsequences
where value (_,_,v1) (_,_,v2) = compare v2 v1
pack (ns,ws,vs) (n,w,v) = (n:ns,ws+w,vs+v)
maxWeight max (_,weight,_) = weight <= max
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