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comfly/Summands.hs

Last active June 8, 2016 21:07
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All summands combinations
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Summands.hs
summands 0 = []
summands n = [n]:concat [summandsOfTwo k (n - k) | k <- [1..n `quot` 2]]
where summandsOfTwo l r =
let le = map (r:) (summands l)
re = map (l:) (summands r)
in if l == r then le else le ++ re
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