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116 Prime Sandwich times out
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Jim Altieri  
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 More options Oct 4 2012, 1:17 pm
From: Jim Altieri <j...@tweeg.net>
Date: Thu, 4 Oct 2012 10:17:05 -0700 (PDT)
Local: Thurs, Oct 4 2012 1:17 pm
Subject: 116 Prime Sandwich times out
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Hey folks,
I know my solution is probably not the best, but it executes on my machine
pretty quickly. Am I doing anything obviously wrong?

(fn [x] (let [prime? (fn [n] (if (= 2 n)
                               true
                               (not-any? #(zero? (rem n %)) (concat '(2)
(range 3 (+ 1 (int (Math/sqrt n))))))))
               nextprime (fn [n] (if (= 2 n)
                                  3
                                  (some #(if (prime? %) %) (iterate
(partial + 2) (+ n 2)))))]
           (if (>= x 5)
             (if (prime? x)
               (let [prev (do (- x (- (nextprime x) x)))]
                 (and (prime? prev) (= (nextprime prev) x)))
               false)
             false)))


 
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hak  
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 More options Oct 5 2012, 4:27 am
From: hak <hkue...@googlemail.com>
Date: Fri, 5 Oct 2012 01:27:07 -0700 (PDT)
Local: Fri, Oct 5 2012 4:27 am
Subject: Re: 116 Prime Sandwich times out
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java functions, like Math/sqrt will kill the performance on 4clojure
replace (+ 1 (int (Math/sqrt n))) with n and it will work

Am Donnerstag, 4. Oktober 2012 19:17:05 UTC+2 schrieb Jim Altieri:


 
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