From 8777ff071f7bb37631baa7b6717ad29961e50911 Mon Sep 17 00:00:00 2001
From: "H.J" <thechairman@thechairman.info>
Date: Wed, 9 Oct 2024 11:36:55 -0400
Subject: sorting by language

---
 racket/leetcode/lc-788-rotated-digits.rkt | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 racket/leetcode/lc-788-rotated-digits.rkt

(limited to 'racket/leetcode/lc-788-rotated-digits.rkt')

diff --git a/racket/leetcode/lc-788-rotated-digits.rkt b/racket/leetcode/lc-788-rotated-digits.rkt
new file mode 100644
index 0000000..79400b8
--- /dev/null
+++ b/racket/leetcode/lc-788-rotated-digits.rkt
@@ -0,0 +1,17 @@
+#lang racket
+
+(define/contract (rotated-digits max-n)
+  (-> exact-integer? exact-integer?)
+  (for/fold ([good-number-count 0])
+            ([n (in-range 1 (add1 max-n))])
+    (if (is-good? n)
+        (add1 good-number-count)
+        good-number-count)))
+
+(define/contract (is-good? test-number)
+  (-> exact-integer? boolean?)
+  (define test-string (number->string test-number))
+  (match test-string
+    [(regexp #rx"^[018]*$") #false]
+    [(regexp #rx"^[0125689]*$") #true]
+    [_ #false]))
\ No newline at end of file
-- 
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