1 files changed, 21 insertions, 0 deletions
diff --git a/2015/day-01/day-01.rkt b/2015/day-01/day-01.rkt
new file mode 100644
index 0000000..2432c96
--- /dev/null
+++ b/2015/day-01/day-01.rkt
@@ -0,0 +1,21 @@
+#lang racket
+(require "../../jj-aoc.rkt")
+
+;; part 1
+(for/fold ([current-floor 0])
+          ([l (in-input-port-chars (open-day 1 2015))]
+           [i (in-naturals)])
+  (match l
+    [#\( (add1 current-floor)]
+    [#\) (sub1 current-floor)]))
+
+;; part 2
+(for/fold ([current-floor 0]
+           [last-index 0]
+           #:result (add1 last-index))
+          ([l (in-input-port-chars (open-day 1 2015))]
+           [i (in-naturals)])
+  #:break (= current-floor -1)
+  (match l
+    [#\( (values (add1 current-floor) i)]
+    [#\) (values (sub1 current-floor) i)]))
+\ No newline at end of file