From fafbeaf9e3c09ba7a5bea7e47d5736001f8a5aa1 Mon Sep 17 00:00:00 2001
From: HJ <thechairman@thechairman.info>
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
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