1 files changed, 20 insertions, 0 deletions
diff --git a/2021/day-01/day-01.rkt b/2021/day-01/day-01.rkt
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+++ b/2021/day-01/day-01.rkt
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+#lang racket
+(require advent-of-code
+         threading)
+
+;; part 1
+(define sensor-data
+  (~> (open-aoc-input (find-session) 2021 1 #:cache (string->path "./cache"))
+      (port->list read _)))
+
+(define (count-increases data offset)
+  (for/sum ([x (in-list data)]
+            [y (in-list (drop data offset))]
+            #:when (< x y))
+    1))
+
+(~a "Part 1: " (count-increases sensor-data 1))
+
+;; part 2
+
+(~a "Part 2: " (count-increases sensor-data 3))
+\ No newline at end of file