From fafbeaf9e3c09ba7a5bea7e47d5736001f8a5aa1 Mon Sep 17 00:00:00 2001
From: HJ <thechairman@thechairman.info>
Date: Tue, 17 Jan 2023 12:46:04 -0500
Subject: adding old leetcode solutions

---
 leetcode/lc-1207-unique-occurences.rkt | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 leetcode/lc-1207-unique-occurences.rkt

(limited to 'leetcode/lc-1207-unique-occurences.rkt')

diff --git a/leetcode/lc-1207-unique-occurences.rkt b/leetcode/lc-1207-unique-occurences.rkt
new file mode 100644
index 0000000..1b4d107
--- /dev/null
+++ b/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
-- 
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