From 43fa240f096fd4e257bce15f8095f3ce691782b9 Mon Sep 17 00:00:00 2001
From: Justin Wernick <justin@worthe-it.co.za>
Date: Fri, 6 Sep 2024 16:14:36 +0200
Subject: Day 1 of AOC2015 in Elixir

---
 2015/day1.exs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 2015/day1.exs

(limited to '2015/day1.exs')

diff --git a/2015/day1.exs b/2015/day1.exs
new file mode 100644
index 0000000..ddb26d5
--- /dev/null
+++ b/2015/day1.exs
@@ -0,0 +1,15 @@
+contents = File.read!("inputs/day1.txt")
+codepoints = String.codepoints(contents)
+
+floors =
+  Enum.map(codepoints, fn
+    "(" -> 1
+    ")" -> -1
+  end)
+  |> Enum.scan(0, &(&1 + &2))
+
+endFloor = List.last(floors)
+firstBasement = Enum.find_index(floors, fn x -> x < 0 end) + 1
+
+IO.puts("Final floor: #{endFloor}")
+IO.puts("First basement on instruction: #{firstBasement}")
-- 
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