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swannodette/gist:1143483

Created August 13, 2011 04:34
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apat.clj
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gistfile1.clj
(defn addup
([xs] (addup xs 0 0))
([xs ones twos]
(match [xs ones twos]
[[] _ _] [ones twos]
[[1 & r] _ _] (recur r (inc ones) twos)
[[2 & r] _ _] (recur r ones (+ twos 2)))))
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