Day 6

Mix.install(
  [
    {:advent_of_code_utils, "~> 3.1"}
  ],
  config: [
    advent_of_code_utils: [session: System.fetch_env!("LB_AOC_TOKEN")]
  ]
)

Mix.Tasks.Aoc.Get.run(["--year", "2022", "--day", "6"])

Inputs

example_input = AOC.example_string(2022, 6)

input = AOC.input_string(2022, 6)

Part 1

example_input
|> String.split("", trim: true)
|> Enum.chunk_every(4, 1, :discard)
|> Enum.take_while(fn chars ->
  MapSet.size(MapSet.new(chars)) != 4
end)
|> Enum.count()
|> then(&(&1 + 4))

input
|> String.split("", trim: true)
|> Enum.chunk_every(4, 1, :discard)
|> Enum.take_while(fn chars ->
  MapSet.size(MapSet.new(chars)) != 4
end)
|> Enum.count()
|> then(&(&1 + 4))

Part 2

example_input
|> String.split("", trim: true)
|> Enum.chunk_every(14, 1, :discard)
|> Enum.take_while(fn chars ->
  MapSet.size(MapSet.new(chars)) != 14
end)
|> Enum.count()
|> then(&(&1 + 14))

input
|> String.split("", trim: true)
|> Enum.chunk_every(14, 1, :discard)
|> Enum.take_while(fn chars ->
  MapSet.size(MapSet.new(chars)) != 14
end)
|> Enum.count()
|> then(&(&1 + 14))