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amalloy/gist:1108576

Created July 27, 2011 03:08
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gistfile1.clj
(defn group-indices [coll]
(loop [[head & tail] coll
new-ids {}
next-id 0
ret []]
(let [found-id (get new-ids head)
[new-ids next-id] (if found-id
[new-ids next-id]
[(assoc new-ids head next-id) (inc next-id)])]
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