Calorie Counting

Mix.install([{:kino, "~> 0.7.0"}])

Input

input = Kino.Input.textarea("Input:")

Part 1

input = Kino.Input.read(input)

input =
  input
  |> String.trim()
  |> String.split("\n\n")
  |> Enum.map(fn x ->
    String.split(x, "\n")
    |> Enum.map(&String.to_integer/1)
  end)

elves = input |> Enum.with_index(fn list, index -> {index + 1, list, Enum.sum(list)} end)

elf = elves |> Enum.max_by(fn {_, _, sum} -> sum end)
{_, _, sum} = elf
sum

Part 2

top3 = Enum.sort(elves, fn {_, _, a}, {_, _, b} -> a > b end) |> Enum.take(3)
Enum.reduce(top3, 0, fn {_, _, sum}, acc -> sum + acc end)