Day 1 of AOC2015 in Elixir

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diff --git a/2015/day1.exs b/2015/day1.exs
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+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}")