Advent of Code 2015 - Day 2

Setup

Mix.install([
  {:kino, "~> 0.4.1"}
])

:ok

input = Kino.Input.textarea("Please enter the input:")

Part 1

input
|> Kino.Input.read()
|> String.split("\n", trim: true)
|> Enum.flat_map(&String.split(&1, "x", trim: true))
|> Enum.map(&String.to_integer/1)
|> Enum.chunk_every(3)
# |> IO.inspect()
|> Enum.map(fn [l, w, h] ->
  side_areas = [l * w, w * h, h * l]
  Enum.sum(side_areas) * 2 + Enum.min(side_areas)
end)
|> Enum.sum()

1588178

Part 2

input
|> Kino.Input.read()
|> String.split("\n", trim: true)
|> Enum.flat_map(&String.split(&1, "x", trim: true))
|> Enum.map(&String.to_integer/1)
|> Enum.chunk_every(3)
|> Enum.map(fn dimensions ->
  shortest_sides = dimensions |> Enum.sort() |> Enum.take(2)
  side_product = Enum.reduce(dimensions, 1, &(&1 * &2))
  side_product + 2 * Enum.sum(shortest_sides)
end)
|> Enum.sum()

3783758