Day 24 Parts 1 and 2
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My (attempted) solutions to [Advent of Code 2020](https://adventofcode.com/2020) in Elixir.
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My (attempted) solutions to [Advent of Code 2020](https://adventofcode.com/2020) in Elixir.
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<img width="978" alt="image" src="https://user-images.githubusercontent.com/498229/102721772-43d60700-4340-11eb-9ccc-baa6479559f8.png">
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<img width="978" alt="image" src="https://user-images.githubusercontent.com/498229/103093696-6321ac80-463e-11eb-933c-8c6b23d15ee0.png">
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## Strategy
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## Strategy
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58
day24/README
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58
day24/README
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Day 24 Notes
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+--------+
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| Part 1 |
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+--------+
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$ elixir day24part1.exs
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326
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Thoughts:
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Interesting. Need to work out how to implement a hexagonal grid.
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Use Enum.chunk_while to parse the variable-length `e`, `ne`, `s', `sw` etc. input tokens.
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I decided to do it like this: Use x, y coordinates, but horizontally adjacent cells are 2 x units
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apart. Diagonally adjacent cells are 1 x unit and 1 y unit apart.
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/ \ (0,0)
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/ \ / \ (1, -1)
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\ / \ /
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↑
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(-1, -1)
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Define a tranlation vector for each direction, then we can walk the directions, and take the sum
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of all the translations.
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Store the black cells in a MapSet, and count them once we're done.
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+--------+
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| Part 2 |
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+--------+
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$ elixir day24part2.exs
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3979
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Thoughts:
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More complicated now, because we actually have to iterate all the black/white cells and their
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neighbours. Calculating the grid extremities looks complicated due to the hexagonal properties.
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However, this is very similar to Day 17 Part 2, so I will just adapt that solution for here too:
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1. For all current black squares, check the neighbours to see what its next state should be.
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- additionally keep track of which white squares we identified.
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2. As white cells must have a black neighbour to be flipped, we know that it's fine to only
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check white cells that are next to a black cell. So iterate the white cells we encountered
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in step 1, and check their neighbours too.
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+------------------+
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| Overall Thoughts |
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+------------------+
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Let another game of life. 3rd time this year? This one was a bit more interesting due to the
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hexagonal nature, but part two was almost the same as Day 17. Maybe that's a good reflection
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on my day 17 implementation, though.
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53
day24/day24part1.exs
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53
day24/day24part1.exs
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defmodule Cell do
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defstruct [:x, :y]
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end
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defmodule Day24Part1 do
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def run do
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File.read!("input")
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|> String.split("\n", trim: true)
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|> Enum.map(&parse_line/1)
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|> Enum.map(&to_cell/1)
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|> Enum.reduce(MapSet.new(), fn cell, black ->
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if MapSet.member?(black, cell) do
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MapSet.delete(black, cell)
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else
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MapSet.put(black, cell)
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end
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end)
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|> Enum.count()
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|> IO.puts()
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end
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def parse_line(str) do
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str
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|> String.graphemes()
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|> Enum.chunk_while(
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nil,
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fn
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"n", nil -> {:cont, :north}
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"s", nil -> {:cont, :south}
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"e", :north -> {:cont, :northeast, nil}
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"e", :south -> {:cont, :southeast, nil}
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"e", nil -> {:cont, :east, nil}
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"w", :north -> {:cont, :northwest, nil}
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"w", :south -> {:cont, :southwest, nil}
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"w", nil -> {:cont, :west, nil}
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end,
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fn acc -> {:cont, acc} end
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)
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end
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def to_cell(directions) do
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Enum.reduce(directions, %Cell{x: 0, y: 0}, &move/2)
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end
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def move(:east, %Cell{x: x, y: y}), do: %Cell{x: x + 2, y: y}
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def move(:west, %Cell{x: x, y: y}), do: %Cell{x: x - 2, y: y}
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def move(:northeast, %Cell{x: x, y: y}), do: %Cell{x: x + 1, y: y + 1}
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def move(:northwest, %Cell{x: x, y: y}), do: %Cell{x: x - 1, y: y + 1}
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def move(:southeast, %Cell{x: x, y: y}), do: %Cell{x: x + 1, y: y - 1}
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def move(:southwest, %Cell{x: x, y: y}), do: %Cell{x: x - 1, y: y - 1}
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end
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Day24Part1.run()
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88
day24/day24part2.exs
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88
day24/day24part2.exs
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defmodule Cell do
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defstruct [:x, :y]
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end
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defmodule Day24Part2 do
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def run do
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File.read!("input")
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|> String.split("\n", trim: true)
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|> Enum.map(&parse_line/1)
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|> Enum.reduce(MapSet.new(), fn cell, black ->
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if MapSet.member?(black, cell) do
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MapSet.delete(black, cell)
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else
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MapSet.put(black, cell)
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end
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end)
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|> flip_times(100)
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|> Enum.count()
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|> IO.puts()
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end
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def parse_line(str) do
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str
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|> String.graphemes()
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|> Enum.chunk_while(
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nil,
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fn
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"n", nil -> {:cont, :north}
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"s", nil -> {:cont, :south}
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"e", :north -> {:cont, :northeast, nil}
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"e", :south -> {:cont, :southeast, nil}
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"e", nil -> {:cont, :east, nil}
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"w", :north -> {:cont, :northwest, nil}
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"w", :south -> {:cont, :southwest, nil}
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"w", nil -> {:cont, :west, nil}
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end,
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fn acc -> {:cont, acc} end
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)
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|> Enum.reduce(%Cell{x: 0, y: 0}, &move/2)
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end
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def move(:east, %Cell{x: x, y: y}), do: %Cell{x: x + 2, y: y}
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def move(:west, %Cell{x: x, y: y}), do: %Cell{x: x - 2, y: y}
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def move(:northeast, %Cell{x: x, y: y}), do: %Cell{x: x + 1, y: y + 1}
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def move(:northwest, %Cell{x: x, y: y}), do: %Cell{x: x - 1, y: y + 1}
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def move(:southeast, %Cell{x: x, y: y}), do: %Cell{x: x + 1, y: y - 1}
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def move(:southwest, %Cell{x: x, y: y}), do: %Cell{x: x - 1, y: y - 1}
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# Below code adapted from Day 17 Part 2
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def flip_times(cells, 0), do: cells
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def flip_times(cells, count), do: flip_times(flip(cells), count - 1)
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def flip(cells) do
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{flipped, whites} =
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Enum.reduce(cells, {MapSet.new(), MapSet.new()}, fn cell, {flipped, whites} ->
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{black_count, whites} =
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Enum.reduce(neighbours(cell), {0, whites}, fn neighbour, {black_count, whites} ->
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if MapSet.member?(cells, neighbour) do
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{black_count + 1, whites}
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else
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{black_count, MapSet.put(whites, neighbour)}
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end
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end)
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flipped =
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if black_count == 0 or black_count > 2,
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do: flipped,
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else: MapSet.put(flipped, cell)
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{flipped, whites}
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end)
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Enum.reduce(whites, flipped, fn white, flipped ->
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black_neighbours =
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white |> neighbours() |> MapSet.new() |> MapSet.intersection(cells) |> Enum.count()
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if black_neighbours == 2, do: MapSet.put(flipped, white), else: flipped
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end)
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end
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def neighbours(cell) do
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[:east, :west, :northeast, :northwest, :southeast, :southwest]
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|> Enum.map(&move(&1, cell))
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end
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end
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Day24Part2.run()
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406
day24/input
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406
day24/input
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swsenenwwneeseswswsenwnwenewenwnwse
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wnewnweswswsenewnenwnwseseweeseswne
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swwnewwswswswswswswsweeswwwswnwew
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seeneeenwweenwnweswwseeeee
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swswseseseswsesesesenwswseswsese
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seseseneswwnesenwseseswwnenwseenwsesw
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nwseseswswenwnwswswneseswswseswseswswswnwse
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enwsenwnewweeeswneenenwesweneswene
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nwnwnwneswsenenwnwwsenwswnewnee
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sesewsesenwseeseneseseseswswseswswsese
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swsenwnwswnwnwneswwnwnenwwwnwnwnenwnw
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eseswwwwswwwnewwwwwwswnewsww
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neswenwenwswseenwseeneenweenenee
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esenwnwwsenwsenenwsenwwnwnwewnwnwwnw
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nwswesweseseeeeeeeesenese
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neneeneesewsewswenenwswnw
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seeneneewneneneneweeneswsenenenee
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enwwneeeswneeenweseeeeseneenee
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swwswsesesesewneseseseeseseseseseene
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nwsewwweswnesewwneseeswwwenwwnw
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nwnenenenwnwswswwnwwnewneenwnwsenenenwse
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nwsenwnwnenwsewnenwwwnwnwnwwnwwnww
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newsenewwwwwwswnwwsesenwwwwwse
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senweeneeneneeneneeswnenenenewenewe
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wwnwneswsewnwnenwesenenwneneneneneenene
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senwnwwwnwnwnwnwnwenenwnwnwswnwnwnwsewnw
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eenwnenenwseneneneswwneeeseseeseenwne
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nwswewewneenwsweneeweneneneee
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swwnwseswswswnweewnwwesw
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wnwwwwwwwwewwwnw
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swnenwswnenenwnwnwsewnenwnenenwnwsenenw
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ewwswswswneswnwwswwwsewwwnwwswsw
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wwseswneswwwwneswwesenwwwww
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neswswwenwswswswnwswseswswswswswswewswsw
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nwswnwswswswswswswseeswswwswswswswswesw
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senwwswwnwnenesesewwnenwswwnewwwse
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neneneneeneswsweeneneneneswneeenwsenw
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swnwneswswwseswswswswswswsweswwsww
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wsenewewenwwwwnwsenwnweww
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swnwswswsenwswswnwswswswswsesweswsweesw
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nenenwnenenenenenwneneswsewnwnwnwsenwnee
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eseeswnwseneseenweeesenwweenwnwsw
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eeeswnenenewenenenewneneeeneeese
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swswswnwseeseswswseseseenwswswse
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swseneseesewnwwnwsenwnewnewneseww
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swwwnewwwsenwwnwswwewnenwnesww
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swseewseeeseeesenwsenesenweeeswe
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nwnwnwnwweswnwnwnwnwwswnwnwnwnwe
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nwwnenwnwwnwnwswsenwnwnwwsenesenwnwne
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seeseseeswseneeeseeseneenweesw
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wneswnwswnenenenenwnenenenenesenenwnwnw
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eseseseswewseseweeneeeeswneese
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nesenenenenenwswnenenwnenwneswnenenenene
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nwwnwsenwnwnwwnwwnwnwnwesewesenenwnwnw
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nwnewnwseweneswnwwnw
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senenesenwneewswewnenenwnenenenwnwne
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eswwseswwswnwswswwwswswnewswswswsw
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nenenenwneenenesenwsweseneesweeneene
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wseneneenewnenenesewnweweneneesw
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eeeeesenweweeeeneeswnewewene
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nwneneeswwneseeswneneneneenenenenwnwsee
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neswseneneenewnewwesweswnee
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senwweneswwwsenenewnenwseewwsesww
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nwseneeenwnewsweeeneeeeenenee
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nwsewnwesweswenwseswneseesese
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swseneswnwneneseseswswswswswswswswswswsewse
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nwseneseeseswswswseswesesewswsewwne
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|
enwseewsesenwsewnewwnenenenenenwsw
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|
swnwwswsenwewswswwsw
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|
wwewwwwnwwwnwwewwwwsw
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nwnewnwnwwnwnwneswnwnwneswsenww
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|
wswnewwwswswswwwnewweswwswwse
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|
swnwweesenewwnesenesenenwwseneene
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|
nwnenwwesenwsewnenwnwwnwnwnwsenw
|
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|
newnwwnwsenwnwnwsewwnewwsewwsew
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swneseswswswsweswswswwswswsenenewswswsw
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swsweseswswseseswnweseswwnesesesesesenwsw
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|
neneneneneswneeneeewnenewneene
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|
sewsenwneswewwnewswwswswwwwswwww
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|
eweeeseeesesesesenwese
|
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|
wnwseswnewseneenwweneeswweeesene
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|
sesewseseseesesesenwsweesese
|
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|
ewnwnwsesenwnesewewswnwnwneswnwwww
|
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|
nwwwnenesewnwnwwwnwwwsww
|
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|
neswwwnenwseewsesweseeene
|
||||||
|
seseswesenwswseswsese
|
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|
senwweseseseseseswnwseswswswsweeswse
|
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|
swwswswwwwsenenewwweswwnwswswesw
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|
eeeenwneenwnewswnenenewswnenenee
|
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|
swwnewswswswswneswswswwsw
|
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|
seeswnewswwwseeenwwswswnew
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|
wnwswswswswswneseswswswswwswnesweswswswsw
|
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|
nenwnenwnwnwnwneswnwnwneseneeneswnwwne
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|
swneneeeeeesweeeswenweeneenee
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|
seseneswnwsweswseswseswsenwse
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|
swewewnweeswwswwewsewnwnwnew
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|
eeeeweeneeeeeneeneseneswesw
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|
wwswwnewwwswwsewnwe
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wswswwnwswsweswseswsewwsenwnwwnenene
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||||||
|
neeeeswnewseesesweeseseeneesee
|
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|
nwnwnwnwnwsenenwwnwnwnwwnwnwnenwnwesenw
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|
swseseswneswseswnwseswswswsese
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|
wwswwwwnwnwnenwnesenwswwnwswnwnenw
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|
wwswswseswwswwswswwwne
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|
nwnwnwnwwnwseneesewnwnwswweneewesw
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|
nesesweeeneeeseseneseseswwseeesese
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|
eesweeseenwweeweneeesene
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|
seseneseseseswseswsenwewsesewwewese
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|
wsweseseenwseseesewneeeesesesenwese
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|
wnwnwenweneswnwnenwnwswnwnwnenwwnwsenwnw
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nwsenenenenwnwnwwnenwnene
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|
eeenwnesenwseswsesenwesesweseseswe
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|
nwnenwneswnwnwnenwnenenenwnwneswnweswnw
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|
weweeeeeeseesenwneneweeeee
|
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|
eewsweeenweeeseenweseeswneene
|
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swswwswswnwewnewswseeswswswswwwnesw
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wsewwswnewwneewwwwsewwenewww
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|
||||||
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Reference in a new issue