diff options
Diffstat (limited to 'h27.hs')
-rw-r--r-- | h27.hs | 13 |
1 files changed, 0 insertions, 13 deletions
@@ -1,13 +0,0 @@ -import Control.Arrow -combination :: Int -> [a] -> [([a],[a])] -combination 0 xs = [([],xs)] -combination _ [] = [] -combination c (x:xs) = (map ((x:).fst &&& snd) (combination (c-1) xs)) ++ (map (fst &&& (x:).snd) (combination c xs)) - -group :: [Int] -> [a] -> [[[a]]] -group [] _ = [[]] --- group [n] xs = map ((:[]).fst) (combination n xs) -group (n:ns) xs = concatMap (\(comb,rest) -> map (comb:) (group ns rest)) (combination n xs) - -group' [] = const [[]] -group' (n:ns) = concatMap (uncurry $ (. group' ns) . map . (:)) . combination n |