Advent of Code 2023 Solutions

Solutions to Advent of Code 2023 - solved in Elixir in order to learn the language.

Repo template taken from https://github.com/mhanberg/advent-of-code-elixir-starter

Usage

There are 25 modules, 25 tests, and 50 mix tasks.

1. Fill in the tests with the example solutions.
2. Write your implementation.
3. Fill in the final problem inputs into the mix task and run mix d01.p1!
   • Benchmark your solution by passing the -b flag, mix d01.p1 -b

defmodule AdventOfCode.Day01 do
  def part1(args) do
  end

  def part2(args) do
  end
end

defmodule AdventOfCode.Day01Test do
  use ExUnit.Case

  import AdventOfCode.Day01

  @tag :skip # Make sure to remove to run your test.
  test "part1" do
    input = nil
    result = part1(input)

    assert result
  end

  @tag :skip # Make sure to remove to run your test.
  test "part2" do
    input = nil
    result = part2(input)

    assert result
  end
end

defmodule Mix.Tasks.D01.P1 do
  use Mix.Task

  import AdventOfCode.Day01

  @shortdoc "Day 01 Part 1"
  def run(args) do
    input = AdventOfCode.Input.get!(1, 2020)

    if Enum.member?(args, "-b"),
      do: Benchee.run(%{part_1: fn -> input |> part1() end}),
      else:
        input
        |> part1()
        |> IO.inspect(label: "Part 1 Results")
  end
end

Optional Automatic Input Retriever

This starter comes with a module that will automatically get your inputs so you don't have to mess with copy/pasting. Don't worry, it automatically caches your inputs to your machine so you don't have to worry about slamming the Advent of Code server. You will need to configure it with your cookie and make sure to enable it. You can do this by creating a config/secrets.exs file containing the following:

import Config

config :advent_of_code, AdventOfCode.Input,
  allow_network?: true,
  session_cookie: "..." # yours will be longer

After which, you can retrieve your inputs using the module:

day = 1
year = 2020
AdventOfCode.Input.get!(day, year)
# or just have it auto-detect the current year
AdventOfCode.Input.get!(7)
# and if your input somehow gets mangled and you need a fresh one:
AdventOfCode.Input.delete!(7, 2019)
# and the next time you `get!` it will download a fresh one -- use this sparingly!