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This commit is contained in:
Justin Ethier 2018-12-18 13:11:12 -05:00
parent 41d35279d0
commit 10bfe42eff
1 changed files with 24 additions and 0 deletions
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24
seq-test.scm
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@ -127,3 +127,27 @@ if (acc) {
; (insert 'todo #;(car set1) (union (cdr set1) set2))))
;
;(write (union '(a b) '(c d)))
(define (union l1 l2)
(inner-union #f l1 l2))
(define inner-union
(lambda (last l1 l2)
(if (null? l1)
l2 ;; TODO: sort l2 (or figure out why we get passed an unsorted list
(if (null? l2)
l1 ;; TODO: sort l1
;; TODO: also have an eq? check to eliminate duplicates
(if (symbol<? (car l1) (car l2))
(if (eq? last (car l1))
(inner-union last (cdr l1) l2)
(cons (car l1) (inner-union (car l1) (cdr l1) l2)))
(if (eq? last (car l2))
(inner-union last l1 (cdr l2))
(cons (car l2) (inner-union (car l2) l1 (cdr l2)))))))))
(write
(union '(a b c) '(d e f)))
(newline)
(write
(union '(p) '(p)))