Day 2

1 files changed, 27 insertions, 0 deletions

diff --git a/2015/day2.exs b/2015/day2.exs
new file mode 100644
index 0000000..47a00ec
--- /dev/null
+++ b/2015/day2.exs
@@ -0,0 +1,27 @@
+stream = File.stream!("inputs/day2.txt", :line, [:read])
+
+materials =
+  for line <- stream, into: [] do
+    sides =
+      String.trim(line)
+      |> String.split("x", trim: true)
+      |> Enum.map(&String.to_integer(&1))
+      |> Enum.sort()
+
+    [w, l, h] = sides
+
+    %{wrapping: w * l * 3 + w * h * 2 + l * h * 2, ribbon: 2 * (w + l) + w * l * h}
+  end
+
+totalWrapping =
+  materials
+  |> Enum.map(& &1.wrapping)
+  |> Enum.sum()
+
+totalRibbon =
+  materials
+  |> Enum.map(& &1.ribbon)
+  |> Enum.sum()
+
+IO.puts("Wrapping used: #{totalWrapping}")
+IO.puts("Ribbon used: #{totalRibbon}")