113 lines
2.2 KiB
Text
113 lines
2.2 KiB
Text
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# AOC 2022 - Day 2
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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 2: Rock Paper Scissors](https://adventofcode.com/2022/day/2).
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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/2/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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<!-- livebook:{"reevaluate_automatically":true} -->
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```elixir
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defmodule Util do
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def process(input) do
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input
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|> String.split("\n", trim: true)
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|> Enum.map(fn entry ->
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entry
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|> String.split()
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|> Enum.map(fn
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symbol when symbol in ["A", "X"] -> :rock
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symbol when symbol in ["B", "Y"] -> :paper
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symbol when symbol in ["C", "Z"] -> :scissors
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end)
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end)
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end
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# Check your opponent vs you
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def check_pair(:rock, :rock), do: :draw
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def check_pair(:rock, :paper), do: :win
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def check_pair(:rock, :scissors), do: :lose
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def check_pair(:paper, :rock), do: :lose
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def check_pair(:paper, :paper), do: :draw
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def check_pair(:paper, :scissors), do: :win
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def check_pair(:scissors, :rock), do: :win
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def check_pair(:scissors, :paper), do: :lose
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def check_pair(:scissors, :scissors), do: :draw
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def points(:win), do: 6
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def points(:draw), do: 3
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def points(:lose), do: 0
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def points(:rock), do: 1
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def points(:paper), do: 2
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def points(:scissors), do: 3
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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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def run(input) do
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Util.process(input)
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|> Enum.map(fn [they, you] -> {you, Util.check_pair(they, you)} end)
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|> Enum.map(fn {played, result} -> Util.points(played) + Util.points(result) end)
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|> Enum.sum()
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end
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end
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defmodule Part2 do
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def run(input) do
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0
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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(A Y
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B X
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C Z)
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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) === 15
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end
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test "part 1" do
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assert Part1.run(@input) === 13052
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end
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test "part 2 example" do
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assert Part2.run(@example_input) === 12
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end
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test "part 2" do
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assert Part2.run(@input) === 0
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end
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end
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ExUnit.run()
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```
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