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authorH.J <thechairman@thechairman.info>2024-10-09 11:36:55 -0400
committerH.J <thechairman@thechairman.info>2024-10-09 11:36:55 -0400
commit8777ff071f7bb37631baa7b6717ad29961e50911 (patch)
tree6d59c4ed58e454b960339c3d1151f0a879e8d7cb /leetcode/lc-1496-path-crossing.rkt
parent6156a9ef7be4012063a042aafb4e9b0d7eadde8e (diff)
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-rw-r--r--leetcode/lc-1496-path-crossing.rkt25
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diff --git a/leetcode/lc-1496-path-crossing.rkt b/leetcode/lc-1496-path-crossing.rkt
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--- a/leetcode/lc-1496-path-crossing.rkt
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@@ -1,25 +0,0 @@
-#lang racket
-(define/contract (is-path-crossing path)
- (-> string? boolean?)
- (for/fold ([current-x 0]
- [current-y 0]
- [trail (set '(0 0))]
- [check #false]
- #:result check)
- ([step (in-list (string->list path))]
- #:break check)
- (let*-values
- ([(new-x new-y)
- (case step
- [(#\N) (values current-x (add1 current-y))]
- [(#\S) (values current-x (sub1 current-y))]
- [(#\E) (values (add1 current-x) current-y)]
- [(#\W) (values (sub1 current-x) current-y)])]
- [(new-trail-point) (list new-x new-y)])
- (cond [(set-member? trail new-trail-point)
- (values void void void #true)]
- [else
- (values new-x
- new-y
- (set-add trail new-trail-point)
- #false)])))) \ No newline at end of file