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| author | H.J <thechairman@thechairman.info> | 2024-10-09 11:36:55 -0400 |
|---|---|---|
| committer | H.J <thechairman@thechairman.info> | 2024-10-09 11:36:55 -0400 |
| commit | 8777ff071f7bb37631baa7b6717ad29961e50911 (patch) | |
| tree | 6d59c4ed58e454b960339c3d1151f0a879e8d7cb /racket/leetcode/lc-788-rotated-digits.rkt | |
| parent | 6156a9ef7be4012063a042aafb4e9b0d7eadde8e (diff) | |
| download | gleam_aoc-8777ff071f7bb37631baa7b6717ad29961e50911.tar.gz gleam_aoc-8777ff071f7bb37631baa7b6717ad29961e50911.zip | |
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Diffstat (limited to 'racket/leetcode/lc-788-rotated-digits.rkt')
| -rw-r--r-- | racket/leetcode/lc-788-rotated-digits.rkt | 17 |
1 files changed, 17 insertions, 0 deletions
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]))
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