From 8777ff071f7bb37631baa7b6717ad29961e50911 Mon Sep 17 00:00:00 2001 From: "H.J" Date: Wed, 9 Oct 2024 11:36:55 -0400 Subject: sorting by language --- racket/leetcode/lc-1207-unique-occurences.rkt | 10 ++++++++++ 1 file changed, 10 insertions(+) create mode 100644 racket/leetcode/lc-1207-unique-occurences.rkt (limited to 'racket/leetcode/lc-1207-unique-occurences.rkt') 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)) \ No newline at end of file -- cgit v1.2.3