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Diffstat (limited to 'leetcode/lc-1496-path-crossing.rkt')
| -rw-r--r-- | leetcode/lc-1496-path-crossing.rkt | 25 |
1 files changed, 0 insertions, 25 deletions
diff --git a/leetcode/lc-1496-path-crossing.rkt b/leetcode/lc-1496-path-crossing.rkt deleted file mode 100644 index 9c1941d..0000000 --- a/leetcode/lc-1496-path-crossing.rkt +++ /dev/null @@ -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)]))))
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