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authorHJ <thechairman@thechairman.info>2023-01-17 12:46:04 -0500
committerHJ <thechairman@thechairman.info>2023-01-17 12:46:04 -0500
commitfafbeaf9e3c09ba7a5bea7e47d5736001f8a5aa1 (patch)
treed586a28650cbbfb20ece931a85bcce4c29e5e40b /leetcode/lc-657-robot-return.rkt
parentbc5387512ba529072338648d6337ddab731b8b8c (diff)
downloadgleam_aoc-fafbeaf9e3c09ba7a5bea7e47d5736001f8a5aa1.tar.gz
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adding old leetcode solutions
Diffstat (limited to 'leetcode/lc-657-robot-return.rkt')
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1 files changed, 17 insertions, 0 deletions
diff --git a/leetcode/lc-657-robot-return.rkt b/leetcode/lc-657-robot-return.rkt
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+#lang racket
+
+(define/contract (judge-circle moves)
+ (-> string? boolean?)
+ (equal? '(0 0)
+ (for/fold ([y-pos 0]
+ [x-pos 0]
+ #:result (list y-pos x-pos))
+ ([move (map string (string->list moves))])
+ (values (case move
+ [("U") (add1 y-pos)]
+ [("D") (sub1 y-pos)]
+ [else y-pos])
+ (case move
+ [("L") (add1 x-pos)]
+ [("R") (sub1 x-pos)]
+ [else x-pos]))))) \ No newline at end of file