diff options
Diffstat (limited to 'racket/leetcode/lc-1207-unique-occurences.rkt')
| -rw-r--r-- | racket/leetcode/lc-1207-unique-occurences.rkt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/racket/leetcode/lc-1207-unique-occurences.rkt b/racket/leetcode/lc-1207-unique-occurences.rkt new file mode 100644 index 0000000..1b4d107 --- /dev/null +++ b/racket/leetcode/lc-1207-unique-occurences.rkt @@ -0,0 +1,10 @@ +#lang racket +(define/contract (unique-occurrences arr) + (-> (listof exact-integer?) boolean?) + (define occurrences (make-hash)) + (for ([n (in-list arr)]) + (hash-update! occurrences n add1 1)) + (equal? (hash-values occurrences) + (remove-duplicates (hash-values occurrences)))) + +(unique-occurrences '(1 2 2 1 1 3))
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