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/gist:3078233

Created July 9, 2012 19:00
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gistfile1.clj
(defn better-sum-to [n]
(reduce + (range 1 (inc n))))
(dotimes [_ 5] (time (better-sum-to 5000000))) ; reduce is 500 times slower
(println "")
(defn best-sum-to [n]
(/ (* n (inc n)) 2))
(dotimes [_ 5] (time (best-sum-to 5000000)))
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