diff --git a/2022/README.md b/2022/README.md
index df95749..e258ae8 100644
--- a/2022/README.md
+++ b/2022/README.md
@@ -2,7 +2,7 @@
My (attempted) solutions to [Advent of Code 2022](https://adventofcode.com/2022) in Elixir.
-
+
## Running:
diff --git a/2022/day5.exs b/2022/day5.exs
new file mode 100644
index 0000000..1a999ee
--- /dev/null
+++ b/2022/day5.exs
@@ -0,0 +1,90 @@
+defmodule Day5 do
+ def part1(input), do: input |> move_with(&move_9000/3) |> top_crates()
+ def part2(input), do: input |> move_with(&move_9001/3) |> top_crates()
+
+ defp move_with({stacks, procedure}, move) do
+ for [number, from_index, to_index] <- procedure, reduce: stacks do
+ stacks ->
+ {moved_from, moved_to} = move.(number, stacks[from_index], stacks[to_index])
+ %{stacks | from_index => moved_from, to_index => moved_to}
+ end
+ end
+
+ defp move_9000(0, from, to), do: {from, to}
+ defp move_9000(number, [crate | from], to), do: move_9000(number - 1, from, [crate | to])
+
+ defp move_9001(number, from, to) do
+ {moving, moved_from} = Enum.split(from, number)
+ {moved_from, moving ++ to}
+ end
+
+ defp top_crates(stacks) do
+ Enum.reduce(stacks, "", fn {_label, [top | _stack]}, acc -> acc <> top end)
+ end
+
+ def input do
+ with [input_filename] <- System.argv(),
+ {:ok, input} <- File.read(input_filename) do
+ [raw_stacks, raw_procedure] = String.split(input, "\n\n")
+
+ stacks =
+ raw_stacks
+ |> String.split("\n")
+ |> parse_stacks()
+ |> Enum.zip()
+ |> Enum.map(fn stack -> stack |> Tuple.to_list() |> Enum.drop_while(&is_nil/1) end)
+ |> Enum.with_index()
+ |> Map.new(fn {stack, index} -> {index + 1, stack} end)
+
+ procedure =
+ raw_procedure
+ |> String.split(["\n", " ", "move", "from", "to"], trim: true)
+ |> Enum.map(&String.to_integer/1)
+ |> Enum.chunk_every(3)
+
+ {stacks, procedure}
+ else
+ _ -> :error
+ end
+ end
+
+ defp parse_stacks([_labels_]), do: []
+ defp parse_stacks([line | rest]), do: [parse_line(line) | parse_stacks(rest)]
+
+ defp parse_line(<<"">>), do: []
+ defp parse_line(<<" ", rest::binary>>), do: [nil | parse_line(rest)]
+ defp parse_line(<<"[", crate::binary-1, "]", rest::binary>>), do: [crate | parse_line(rest)]
+ defp parse_line(<<" ", rest::binary>>), do: parse_line(rest)
+
+ #######################
+ # HERE BE BOILERPLATE #
+ #######################
+
+ def run do
+ case input() do
+ :error -> print_usage()
+ input -> run_parts_with_timer(input)
+ end
+ end
+
+ defp run_parts_with_timer(input) do
+ run_with_timer(1, fn -> part1(input) end)
+ run_with_timer(2, fn -> part2(input) end)
+ end
+
+ defp run_with_timer(part, fun) do
+ {time, result} = :timer.tc(fun)
+ IO.puts("Part #{part} (completed in #{format_time(time)}):\n")
+ IO.puts("#{result}\n")
+ end
+
+ defp format_time(μsec) when μsec < 1_000, do: "#{μsec}μs"
+ defp format_time(μsec) when μsec < 1_000_000, do: "#{μsec / 1000}ms"
+ defp format_time(μsec), do: "#{μsec / 1_000_000}s"
+
+ defp print_usage do
+ IO.puts("Usage: elixir day5.exs input_filename")
+ end
+end
+
+Day5.run()