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Solve 2024/12 - 1
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‎README.md‎

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Note: All files mentioned above are autogenerated and are created by running `mix update_stats` task.
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# :star: 297/500 :dart: 203 :trophy: 148.5/250 :dart: 101.5
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# :star: 299/500 :dart: 201 :trophy: 149.5/250 :dart: 100.5
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| Day | [2015](/lib/2015) | [2016](/lib/2016) | [2017](/lib/2017) | [2018](/lib/2018) | [2019](/lib/2019) | [2020](/lib/2020) | [2021](/lib/2021) | [2022](/lib/2022) | [2023](/lib/2023) | [2024](/lib/2024) |
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| :star2: | 48 | 22 | 34 | 15 | 15 | 44 | 24 | 45 | 44 | 6 |
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| :star2: | 48 | 22 | 34 | 15 | 15 | 45 | 24 | 45 | 44 | 7 |
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| 1 | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: |
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| 9 | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | |
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| 12 | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | | | :1st_place_medal: | | :1st_place_medal: | :1st_place_medal: | |
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| 12 | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | | | :1st_place_medal: | | :1st_place_medal: | :1st_place_medal: | :2nd_place_medal: |
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| 13 | :1st_place_medal: | | :1st_place_medal: | | | :1st_place_medal: | | :1st_place_medal: | :1st_place_medal: | |
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| 14 | :1st_place_medal: | | :2nd_place_medal: | | | :1st_place_medal: | | :1st_place_medal: | :1st_place_medal: | |
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| 15 | :1st_place_medal: | | :1st_place_medal: | | | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | |
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| 20 | :1st_place_medal: | | | | | :2nd_place_medal: | | :1st_place_medal: | | |
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| 25 | :1st_place_medal: | | | | | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | :1st_place_medal: | |
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‎lib/2020/README.md‎

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[2015](/lib/2015) | [2016](/lib/2016) | [2017](/lib/2017) | [2018](/lib/2018) | [2019](/lib/2019) | 2020 | [2021](/lib/2021) | [2022](/lib/2022) | [2023](/lib/2023) | [2024](/lib/2024)
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## :trophy: 44/50
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## :trophy: 45/50
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| Day | Problem Page | Status | Difficulty | Solution Page | Test Page | Tags |
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| :---: | :------: | :---: | :---: | :---: | :---: | :---: |
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| 20 | [Jurassic Jigsaw](https://adventofcode.com/2020/day/20) | :2nd_place_medal: | :shrug: | [day_20.ex](/lib/2020/day_20.ex) | [day_20_test.exs](/test/2020/day_20_test.exs) | |
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| 21 | [Allergen Assessment](https://adventofcode.com/2020/day/21) | :1st_place_medal: | :shrug: | [day_21.ex](/lib/2020/day_21.ex) | [day_21_test.exs](/test/2020/day_21_test.exs) | |
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| 22 | [Crab Combat](https://adventofcode.com/2020/day/22) | :1st_place_medal: | :shrug: | [day_22.ex](/lib/2020/day_22.ex) | [day_22_test.exs](/test/2020/day_22_test.exs) | |
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| 23 | [Crab Cups](https://adventofcode.com/2020/day/23) | :2nd_place_medal: | :shrug: | [day_23.ex](/lib/2020/day_23.ex) | [day_23_test.exs](/test/2020/day_23_test.exs) | |
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| 23 | [Crab Cups](https://adventofcode.com/2020/day/23) | :1st_place_medal: | :shrug: | [day_23.ex](/lib/2020/day_23.ex) | [day_23_test.exs](/test/2020/day_23_test.exs) | |
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| 24 | [Lobby Layout](https://adventofcode.com/2020/day/24) | :2nd_place_medal: | :shrug: | [day_24.ex](/lib/2020/day_24.ex) | [day_24_test.exs](/test/2020/day_24_test.exs) | |
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| 25 | [Combo Breaker](https://adventofcode.com/2020/day/25) | :1st_place_medal: | :shrug: | [day_25.ex](/lib/2020/day_25.ex) | [day_25_test.exs](/test/2020/day_25_test.exs) | |
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‎lib/2024/README.md‎

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[2015](/lib/2015) | [2016](/lib/2016) | [2017](/lib/2017) | [2018](/lib/2018) | [2019](/lib/2019) | [2020](/lib/2020) | [2021](/lib/2021) | [2022](/lib/2022) | [2023](/lib/2023) | 2024
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| Day | Problem Page | Status | Difficulty | Solution Page | Test Page | Tags |
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| :---: | :------: | :---: | :---: | :---: | :---: | :---: |
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| 1 | [Historian Hysteria](https://adventofcode.com/2024/day/1) | :1st_place_medal: | :snowflake: | [day_01.ex](/lib/2024/day_01.ex) | [day_01_test.exs](/test/2024/day_01_test.exs) | [list](/wiki/tags.md#list) |
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| 3 | [Mull It Over](https://adventofcode.com/2024/day/3) | :1st_place_medal: | :snowflake: | [day_03.ex](/lib/2024/day_03.ex) | [day_03_test.exs](/test/2024/day_03_test.exs) | [regex](/wiki/tags.md#regex), [fsm](/wiki/tags.md#fsm) |
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| 5 | [Print Queue](https://adventofcode.com/2024/day/5) | :1st_place_medal: | :snowflake: | [day_05.ex](/lib/2024/day_05.ex) | [day_05_test.exs](/test/2024/day_05_test.exs) | [set](/wiki/tags.md#set), [sort](/wiki/tags.md#sort) |
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| 12 | [Garden Groups](https://adventofcode.com/2024/day/12) | :2nd_place_medal: | :snowflake: :snowflake: :snowflake: | [day_12.ex](/lib/2024/day_12.ex) | [day_12_test.exs](/test/2024/day_12_test.exs) | [geometry](/wiki/tags.md#geometry), [disjoint-set](/wiki/tags.md#disjoint-set) |
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‎lib/2024/day_12.ex‎

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defmodule AdventOfCode.Y2024.Day12 do
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@moduledoc """
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--- Day 12: Garden Groups ---
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Problem Link: https://adventofcode.com/2024/day/12
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Difficulty: m
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Tags: geometry disjoint-set
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"""
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alias AdventOfCode.Algorithms.DisjointSet
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alias AdventOfCode.Algorithms.Grid
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alias AdventOfCode.Helpers.{InputReader, Transformers}
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def input, do: InputReader.read_from_file(2024, 12)
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def run(input \\ input()) do
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input = parse(input)
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{run_1(input), run_2(input)}
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end
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defp run_1(input) do
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Enum.sum_by(input, fn {_, plants} ->
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plants |> Enum.sum_by(fn plant -> calculate_price(plant, &perimeters/1) end)
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end)
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end
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defp run_2(_input) do
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nil
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end
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def parse(data \\ input()),
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do: Transformers.lines(data) |> Enum.map(&String.graphemes/1) |> Grid.grid2d() |> plants()
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def plants(grid) do
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grid
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|> Enum.group_by(fn {_, plant} -> plant end, fn {grid, _} -> grid end)
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|> Map.new(fn {plant, locations} -> {plant, regions(locations)} end)
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end
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defp regions(plants) do
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Enum.reduce(plants, DisjointSet.new(plants), fn plant, region ->
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plant
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|> Grid.surrounding4()
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|> Enum.reduce(region, fn neighbour, region_acc ->
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region_acc
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|> DisjointSet.union(plant, neighbour)
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end)
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end)
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|> DisjointSet.components()
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end
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defp calculate_price(plant_set, multiply_by) do
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Enum.sum(multiply_by.(plant_set)) * Enum.count(plant_set)
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end
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defp perimeters(plant_set) do
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plant_set
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|> Enum.map(fn plant ->
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plant
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|> Grid.surrounding4()
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|> Enum.reject(&MapSet.member?(plant_set, &1))
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|> Enum.count()
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end)
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end
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def sample_input_1, do: "AAAA\nBBCD\nBBCC\nEEEC"
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def sample_input_2 do
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~w[
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RRRRIICCFF
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RRRRIICCCF
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VVRRRCCFFF
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VVRCCCJFFF
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VVVVCJJCFE
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VVIVCCJJEE
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VVIIICJJEE
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MIIIIIJJEE
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MIIISIJEEE
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MMMISSJEEE
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]
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|> Enum.join("\n")
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end
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end

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