You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
|
|
#lang restructure/racket
|
|
|
|
|
|
|
|
(define pointer-ks (make-hash))
|
|
|
|
(define results (make-hash))
|
|
|
|
|
|
|
|
(define vals '(a b (h) d e f g h i j))
|
|
|
|
|
|
|
|
(for ([(val i) (in-indexed vals)]
|
|
|
|
#:unless (hash-has-key? results val))
|
|
|
|
(hash-set! results i (let/cc pointer-k
|
|
|
|
(cond
|
|
|
|
[(hash-ref pointer-ks val #f) => (λ (pk)
|
|
|
|
(hash-remove! pointer-ks val)
|
|
|
|
(pk (format "~a@~a" val i)))]
|
|
|
|
[(pair? val) (hash-set! pointer-ks (car val) pointer-k) 'tbd]
|
|
|
|
[else val]))))
|
|
|
|
(test-module
|
|
|
|
(check-equal?
|
|
|
|
(for/list ([i (in-range (length (hash-keys results)))])
|
|
|
|
(hash-ref results i))
|
|
|
|
'(a b "h@7" d e f g h i j)))
|