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;; Exp. (list-reverse '(1 (2 3) (4 (5 6) (7 8 (9))))) ==> ((((9) 8 7) (6 5) 4) (3 2) 1) | |
(define (list-reverse L) | |
(if (null? L) L | |
(if (list? (car L)) | |
(append (list-reverse (cdr L)) (cons (list-reverse (car L)) '())) | |
(append (list-reverse (cdr L)) (list (car L)))))) |
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;; same as the merge function in MergeSort.scm | |
(define (insert L M) | |
(if (null? L) M | |
(if (null? M) L | |
(if (< (car L) (car M)) | |
(cons (car L) (insert (cdr L) M)) | |
(cons (car M) (insert (cdr M) L)))))) | |
;; another insert function | |
;; need to modify the first para in insertionsort function to (car L) |
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;; Exp. (merge '(1 3 5 7 8 9 10) '(2 4 6)) ==> (1 2 3 4 5 6 7 8 9 10) | |
(define (merge L M) | |
(if (null? L) M | |
(if (null? M) L | |
(if (< (car L) (car M)) | |
(cons (car L) (merge (cdr L) M)) | |
(cons (car M) (merge (cdr M) L)))))) | |
;; split helper functions | |
(define (odd L) |