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1 files changed, 35 insertions, 0 deletions

diff --git a/racket/aoc2022/day-22/day-22.rkt b/racket/aoc2022/day-22/day-22.rkt
new file mode 100644
index 0000000..bcce5f8
--- /dev/null
+++ b/racket/aoc2022/day-22/day-22.rkt
@@ -0,0 +1,35 @@
+#lang racket
+
+(require advent-of-code
+         threading)
+
+(struct posn (x y) #:transparent)
+
+(match-define (list raw-map raw-instructions)
+  (string-split (fetch-aoc-input (find-session) 2022 22 #:cache #true) "\n\n"))
+
+(define board-map
+  (for*/hash ([(row y) (in-indexed (string-split raw-map "\n"))]
+              [(col x) (in-indexed row)]
+              #:unless (equal? col #\space))
+    (define tile
+      (match col
+        [#\. 'open]
+        [#\# 'wall]))
+    (values (posn x y) tile)))
+
+(define instructions
+  (~>> raw-instructions
+       (regexp-match* #px"(\\d+)|R|L")
+       (map (match-lambda
+              [(? string->number n) (string->number n)]
+              ["R" 'clockwise]
+              ["L" 'counterclockwise]))))
+
+(define start-tile
+  (~>> board-map
+       hash-keys
+       (filter (match-lambda
+                 [(posn _ 0) #true]
+                 [_ #false]))
+       (argmin posn-x)))
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