1

System.argv()
|> List.first()
|> File.read!()
|> String.split("\n\n")
|> Enum.map(fn elf_inventory ->
  elf_inventory
  |> String.split("\n")
  |> Enum.flat_map(fn
    "" -> []
    cals -> [String.to_integer(cals)]
  end)
  |> Enum.sum()
end)
|> Enum.max()
|> IO.inspect()

2

System.argv()
|> List.first()
|> File.read!()
|> String.split("\n\n")
|> Enum.reduce([0, 0, 0], fn elf_inventory, top_3 ->
  cal_sum =
    elf_inventory
    |> String.split("\n")
    |> Enum.flat_map(fn
      "" -> []
      cals -> [String.to_integer(cals)]
    end)
    |> Enum.sum()

  if cal_sum > List.first(top_3) do
    Enum.sort([cal_sum | Enum.drop(top_3, 1)])
  else
    top_3
  end
end)
|> Enum.sum()
|> IO.inspect()