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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-217-contains-duplicate.rkt | |
| parent | 6156a9ef7be4012063a042aafb4e9b0d7eadde8e (diff) | |
| download | gleam_aoc-8777ff071f7bb37631baa7b6717ad29961e50911.tar.gz gleam_aoc-8777ff071f7bb37631baa7b6717ad29961e50911.zip | |
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Diffstat (limited to 'racket/leetcode/lc-217-contains-duplicate.rkt')
| -rw-r--r-- | racket/leetcode/lc-217-contains-duplicate.rkt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/racket/leetcode/lc-217-contains-duplicate.rkt b/racket/leetcode/lc-217-contains-duplicate.rkt new file mode 100644 index 0000000..ca8d193 --- /dev/null +++ b/racket/leetcode/lc-217-contains-duplicate.rkt @@ -0,0 +1,12 @@ +#lang racket +(define/contract (contains-duplicate nums) + (-> (listof exact-integer?) boolean?) + (define nums-hash (make-hash)) + (define (check-next-number nums) + (cond [(empty? nums) #false] + [(hash-ref nums-hash (car nums) #false) #true] + [else (hash-set! nums-hash (car nums) #true) + (check-next-number (cdr nums))])) + (check-next-number nums)) + +(contains-duplicate '(1 2 3))
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