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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,42 @@ | ||
| defmodule AdventOfCode.Y2023.Day06 do | ||
| @moduledoc """ | ||
| --- Day 6: Wait For It --- | ||
| Problem Link: https://adventofcode.com/2023/day/6 | ||
| Difficulty: xs | ||
| Tags: algebra | ||
| """ | ||
| alias AdventOfCode.Helpers.{InputReader, Transformers} | ||
|
|
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| def input, do: InputReader.read_from_file(2023, 6) | ||
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| def run(input \\ input()) do | ||
| input = parse(input) | ||
| {run_1(input), run_2(input)} | ||
| end | ||
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| defp run_1(input), do: Enum.reduce(input, 1, &(&2 * s(&1))) | ||
| defp run_2(input), do: input |> join_numbers() |> s() | ||
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| def parse(data \\ input()) do | ||
| data | ||
| |> Transformers.lines() | ||
| |> Enum.map(&extract/1) | ||
| |> then(fn [times, records] -> Enum.zip(times, records) end) | ||
| end | ||
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| defp extract(data), | ||
| do: ~r{\d+} |> Regex.scan(data) |> List.flatten() |> Enum.map(&String.to_integer/1) | ||
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| defp s({time, record}) do | ||
| delta = :math.sqrt(time * time - 4 * record) | ||
| floor((time + delta) / 2) - ceil((time - delta) / 2) + 1 | ||
| end | ||
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| defp join_numbers(data) do | ||
| data | ||
| |> Enum.unzip() | ||
| |> Tuple.to_list() | ||
| |> Enum.map(&(&1 |> Enum.join() |> String.to_integer())) | ||
| |> List.to_tuple() | ||
| end | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,2 @@ | ||
| Time: 42 68 69 85 | ||
| Distance: 284 1005 1122 1341 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,12 @@ | ||
| defmodule AdventOfCode.Y2023.Day06Test do | ||
| @moduledoc false | ||
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| use ExUnit.Case | ||
| @moduletag :y2306 | ||
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| alias AdventOfCode.Y2023.Day06, as: Solution | ||
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| test "Year 2023, Day 6 run/1" do | ||
| assert Solution.run() == {440_000, 26_187_338} | ||
| end | ||
| end |