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Problem 8
(def bignumber "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450")
(defn circ-buf-conj [buf-size l item]
; Possibly remove an item if it is too long:
(let [newl (if (> buf-size (count l)) l
(-> (reverse l) (reverse) (pop) (vec)))]
(conj newl item)))
(def buf5 (partial circ-buf-conj 5))
(defn c-to-i [c] (-> (int c) (- (int \0))))
(->> (seq bignumber)
(map c-to-i)
(reductions buf5 [1])
(map #(apply * %))
(apply max))
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