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authorH.J <thechairman@thechairman.info>2024-10-09 11:36:55 -0400
committerH.J <thechairman@thechairman.info>2024-10-09 11:36:55 -0400
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tree6d59c4ed58e454b960339c3d1151f0a879e8d7cb /racket/leetcode/lc-1207-unique-occurences.rkt
parent6156a9ef7be4012063a042aafb4e9b0d7eadde8e (diff)
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diff --git a/racket/leetcode/lc-1207-unique-occurences.rkt b/racket/leetcode/lc-1207-unique-occurences.rkt
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+#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