{tree = Root; filler = t}
;;
+
+
let make_fringe_enumerator (t: 'a tree) =
(* create a zipper targetting the root of t *)
let zstart = new_zipper t
(same-fringe? tree1 tree2)
-<!--
- (define (lazy-flatten tree)
- (letrec ([helper (lambda (tree tailk)
- (cond
- [(pair? tree)
- (helper (car tree) (lambda () (helper (cdr tree) tailk)))]
- [else (cons tree tailk)]))])
- (helper tree (lambda () (list)))))
-
- (define (stream-equal? stream1 stream2)
- (cond
- [(and (null? stream1) (null? stream2)) #t]
- [(and (pair? stream1) (pair? stream2))
- (and (equal? (car stream1) (car stream2))
- (stream-equal? ((cdr stream1)) ((cdr stream2))))]
- [else #f]))
-
- (define (same-fringe? tree1 tree2)
- (stream-equal? (lazy-flatten tree1) (lazy-flatten tree2)))
-
- (define tree1 '(((1 . 2) . (3 . 4)) . (5 . 6)))
- (define tree2 '(1 . (((2 . 3) . (4 . 5)) . 6)))
-
- (same-fringe? tree1 tree2)
--->