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fibonacci improvements

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Pekka Laiho 2020-10-17 14:15:14 +07:00
parent 9209b8dd92
commit 475ddf5a20
1 changed files with 2 additions and 1 deletions
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3
mad/fib.mad
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@ -4,8 +4,9 @@
(def slowFib (fn (n) (if (< n 2) n (+ (slowFib (- n 1)) (slowFib (- n 2))))))
;; Return the sum of the last 2 numbers in a sequence
(def sumOfLast (fn (l) (+ (last l) (get l (- (len l) 2)))))
(def sumOfLast (fn (l) (+ (last l) (penult l))))
;; Faster version, return vector of n numbers, tail call optimized
(def fibListRec (fn (n l) (if (< (len l) n) (fibListRec n (push l (sumOfLast l))) l)))
(def fibList (fn (n) (fibListRec n [0 1])))
(def fastFib (fn (n) (sumOfLast (fibList n))))