From fafbeaf9e3c09ba7a5bea7e47d5736001f8a5aa1 Mon Sep 17 00:00:00 2001 From: HJ Date: Tue, 17 Jan 2023 12:46:04 -0500 Subject: adding old leetcode solutions --- leetcode/lc-657-robot-return.rkt | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) create mode 100644 leetcode/lc-657-robot-return.rkt (limited to 'leetcode/lc-657-robot-return.rkt') diff --git a/leetcode/lc-657-robot-return.rkt b/leetcode/lc-657-robot-return.rkt new file mode 100644 index 0000000..908605a --- /dev/null +++ b/leetcode/lc-657-robot-return.rkt @@ -0,0 +1,17 @@ +#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 -- cgit v1.2.3