113 lines
1.7 KiB
Text
113 lines
1.7 KiB
Text
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# AOC 2022 - Day 1
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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 1: Calorie Counting](https://adventofcode.com/2022/day/1).
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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/1/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 Util do
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def create_chunk(val, acc) do
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if val == "" do
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{:cont, Enum.reverse(acc), []}
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else
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val = String.to_integer(val)
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{:cont, [val | acc]}
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end
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end
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def process_chunks([]), do: {:cont, []}
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def process_chunks(acc), do: {:cont, Enum.reverse(acc), []}
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def process(input) do
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input
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|> String.trim()
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|> String.split("\n")
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|> Enum.chunk_while([], &Util.create_chunk/2, &Util.process_chunks/1)
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|> Enum.map(&Enum.sum/1)
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end
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end
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defmodule Part1 do
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def run(input) do
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input
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|> Util.process()
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|> Enum.max()
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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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input
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|> Util.process()
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|> Enum.sort(:desc)
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|> Enum.take(3)
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|> Enum.sum()
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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(
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1000
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2000
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3000
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4000
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5000
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6000
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7000
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8000
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9000
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10000
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)
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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) === 24000
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end
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test "part 1" do
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assert Part1.run(@input) === 68442
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end
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test "part 2 example" do
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assert Part2.run(@example_input) === 45000
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end
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test "part 2" do
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assert Part2.run(@input) === 204_837
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end
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end
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ExUnit.run()
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```
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