Created
February 8, 2015 07:32
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interleaver and permutation
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| perms :: [Int] -> [[Int]] | |
| perms [] = [[]] | |
| perms (t:ts) = concatMap (interleave id t) (perms ts) | |
| interleave :: ([Int] -> [Int]) -> Int -> [Int] -> [[Int]] | |
| interleave f t [] = [f [t]] | |
| interleave f t (x:xs) = (f (t:x:xs)) : interleave (f . (x:)) t xs |
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