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Ingy döt Net 2023-07-01 11:58:00 -04:00
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commit cb5bb5e222
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Task/Leonardo-numbers/Racket/leonardo-numbers.rkt Normal file
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#lang racket
(define (Leonardo n #:L0 (L0 1) #:L1 (L1 1) #:1+ (1+ 1))
(cond [(= n 0) L0]
[(= n 1) L1]
[else
(let inr ((n (- n 2)) (L_n-2 L0) (L_n-1 L1))
(let ((L_n (+ L_n-1 L_n-2 1+)))
(if (zero? n) L_n (inr (sub1 n) L_n-1 L_n))))]))
(module+ main
(map Leonardo (range 25))
(map (curry Leonardo #:L0 0 #:L1 1 #:1+ 0) (range 25)))
(module+ test
(require rackunit)
(check-equal? (Leonardo 0) 1)
(check-equal? (Leonardo 1) 1)
(check-equal? (Leonardo 2) 3)
(check-equal? (Leonardo 3) 5))