87 lines
1.4 KiB
Text
87 lines
1.4 KiB
Text
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# AOC 2022 - Day 6
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```elixir
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Mix.install([
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{:req, "~> 0.3.3"}
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])
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```
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## Puzzle description
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[Day 6: Tuning Trouble](https://adventofcode.com/2022/day/6).
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## Input
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```elixir
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defmodule Load do
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def input do
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aoc_session = System.fetch_env!("LB_AOC_SESSION")
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input_url = "https://adventofcode.com/2022/day/6/input"
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Req.get!(input_url, headers: [cookie: "session=#{aoc_session}"]).body
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end
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end
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```
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## Solution
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```elixir
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defmodule Marker do
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def find(input, marker_length) do
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input
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|> String.graphemes()
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|> Enum.chunk_every(marker_length, 1)
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|> Enum.map(&MapSet.new/1)
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|> Enum.find_index(&(MapSet.size(&1) == marker_length))
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|> Kernel.+(marker_length)
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end
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end
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```
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```elixir
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defmodule Part1 do
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@marker_length 4
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def run(input) do
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input
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|> Marker.find(@marker_length)
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end
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end
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defmodule Part2 do
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@marker_length 14
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def run(input) do
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input
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|> Marker.find(@marker_length)
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end
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end
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ExUnit.start(autorun: false)
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defmodule Test do
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use ExUnit.Case, async: true
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@example_input ~s(mjqjpqmgbljsphdztnvjfqwrcgsmlb)
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@input Load.input()
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test "it loads the input" do
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assert String.length(@input) > 0
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end
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test "part 1 example" do
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assert Part1.run(@example_input) === 7
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end
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test "part 1" do
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assert Part1.run(@input) === 1093
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end
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test "part 2 example" do
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assert Part2.run(@example_input) === 19
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end
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test "part 2" do
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assert Part2.run(@input) === 3534
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end
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end
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ExUnit.run()
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```
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