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2 files changed, 40 insertions, 0 deletions

diff --git a/racket/aoc2021/day-01/day-01.pl b/racket/aoc2021/day-01/day-01.pl
new file mode 100644
index 0000000..d3c3fa7
--- /dev/null
+++ b/racket/aoc2021/day-01/day-01.pl
@@ -0,0 +1,20 @@
+:- use_module(library(yall)).
+:- use_module(library(apply)).
+
+get_data(Result) :- 
+    setup_call_cleanup(open("day-01/input.txt", read, In),
+        (read_string(In, _, Str),
+            split_string(Str, "\n", "\s\t\n", Lines),
+            maplist(number_string, Result, Lines)),
+        close(In)).
+
+calculate_diffs(Result, WindowWidth) :-
+    get_data(Xs),
+    length(TrimLeft, WindowWidth), append(TrimLeft, RightSide, Xs),
+    length(TrimRight, WindowWidth), append(LeftSide, TrimRight, Xs),
+    maplist([X, Y, Z]>>(Z is Y - X), LeftSide, RightSide, Diffs),
+    include([X]>>(X > 0), Diffs, Increases),
+    length(Increases, Result).
+
+part1_answer(Result) :- calculate_diffs(Result, 1).
+part2_answer(Result) :- calculate_diffs(Result, 3).
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diff --git a/racket/aoc2021/day-01/day-01.rkt b/racket/aoc2021/day-01/day-01.rkt
new file mode 100644
index 0000000..48ef158
--- /dev/null
+++ b/racket/aoc2021/day-01/day-01.rkt
@@ -0,0 +1,20 @@
+#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))
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