From fafbeaf9e3c09ba7a5bea7e47d5736001f8a5aa1 Mon Sep 17 00:00:00 2001 From: HJ Date: Tue, 17 Jan 2023 12:46:04 -0500 Subject: adding old leetcode solutions --- leetcode/lc-788-rotated-digits.rkt | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) create mode 100644 leetcode/lc-788-rotated-digits.rkt (limited to 'leetcode/lc-788-rotated-digits.rkt') diff --git a/leetcode/lc-788-rotated-digits.rkt b/leetcode/lc-788-rotated-digits.rkt new file mode 100644 index 0000000..79400b8 --- /dev/null +++ b/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 -- cgit v1.2.3