Day 11: remove debug code, simpler datastructure
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212e979cbd
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@ -5,52 +5,47 @@ defmodule Day11Part1 do
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|> Enum.map(&String.to_charlist/1)
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|> parse_seat_plan()
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|> run_until_stable()
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|> elem(2)
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|> count_occupied()
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|> IO.inspect()
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end
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def run_until_stable(state) do
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new_state = tick(state)
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def run_until_stable(seats) do
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new_seats = tick(seats)
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if new_state == state do
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state
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if new_seats == seats do
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seats
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else
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run_until_stable(new_state)
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run_until_stable(new_seats)
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end
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end
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def tick({width, height, old_seats}) do
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new_seats =
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for(
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x <- 0..(width - 1),
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y <- 0..(height - 1),
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do: {x, y}
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)
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|> Enum.reduce(%{}, fn {x, y}, new_seats ->
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toggle(old_seats[{x, y}], x, y, old_seats, new_seats)
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end)
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{width, height, new_seats}
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def tick(seats) do
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Map.new(seats, fn {{x, y}, old_seat} -> toggle(old_seat, x, y, seats) end)
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end
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def toggle(:empty, x, y, old_seats, new_seats) do
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if occupied_adjacent(x, y, old_seats) == 0 do
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Map.put(new_seats, {x, y}, :occupied)
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else
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Map.put(new_seats, {x, y}, :empty)
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end
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def toggle(:empty, x, y, seats) do
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new_value =
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if occupied_adjacent(x, y, seats) == 0 do
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:occupied
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else
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:empty
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end
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{{x, y}, new_value}
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end
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def toggle(:occupied, x, y, old_seats, new_seats) do
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if occupied_adjacent(x, y, old_seats) >= 4 do
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Map.put(new_seats, {x, y}, :empty)
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else
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Map.put(new_seats, {x, y}, :occupied)
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end
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def toggle(:occupied, x, y, seats) do
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new_value =
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if occupied_adjacent(x, y, seats) >= 4 do
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:empty
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else
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:occupied
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end
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{{x, y}, new_value}
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end
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def toggle(:floor, x, y, _, new_seats), do: Map.put(new_seats, {x, y}, :floor)
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def toggle(:floor, x, y, _), do: {{x, y}, :floor}
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def occupied_adjacent(x, y, seats) do
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adjacent = [
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@ -74,37 +69,24 @@ defmodule Day11Part1 do
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end
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def parse_seat_plan(input) do
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Enum.reduce(input, {0, 0, %{}}, fn row, {_x, y, seats} ->
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{x, seats} =
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Enum.reduce(row, {0, seats}, fn seat, {x, seats} ->
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seat =
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case seat do
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?L -> :empty
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?. -> :floor
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end
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{_, seats} =
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Enum.reduce(input, {0, %{}}, fn row, {y, seats} ->
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{_, seats} =
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Enum.reduce(row, {0, seats}, fn seat, {x, seats} ->
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seat =
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case seat do
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?L -> :empty
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?. -> :floor
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?# -> :occupied
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end
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{x + 1, Map.put(seats, {x, y}, seat)}
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end)
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{x + 1, Map.put(seats, {x, y}, seat)}
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end)
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{x, y + 1, seats}
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end)
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end
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{y + 1, seats}
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end)
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def visualize({width, height, seats}) do
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for y <- 0..(height - 1) do
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for x <- 0..(width - 1) do
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char =
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case seats[{x, y}] do
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:empty -> "L"
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:floor -> "."
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:occupied -> "#"
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end
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IO.write(char)
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end
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IO.write("\n")
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end
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seats
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end
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end
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@ -5,52 +5,47 @@ defmodule Day11Part2 do
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|> Enum.map(&String.to_charlist/1)
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|> parse_seat_plan()
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|> run_until_stable()
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|> elem(2)
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|> count_occupied()
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|> IO.inspect()
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end
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def run_until_stable(state) do
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new_state = tick(state)
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def run_until_stable(seats) do
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new_seats = tick(seats)
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if new_state == state do
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state
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if new_seats == seats do
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seats
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else
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run_until_stable(new_state)
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run_until_stable(new_seats)
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end
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end
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def tick({width, height, old_seats}) do
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new_seats =
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for(
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x <- 0..(width - 1),
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y <- 0..(height - 1),
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do: {x, y}
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)
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|> Enum.reduce(%{}, fn {x, y}, new_seats ->
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toggle(old_seats[{x, y}], x, y, old_seats, new_seats)
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end)
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{width, height, new_seats}
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def tick(seats) do
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Map.new(seats, fn {{x, y}, old_seat} -> toggle(old_seat, x, y, seats) end)
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end
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def toggle(:empty, x, y, old_seats, new_seats) do
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if occupied_visible(x, y, old_seats) == 0 do
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Map.put(new_seats, {x, y}, :occupied)
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else
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Map.put(new_seats, {x, y}, :empty)
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end
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def toggle(:empty, x, y, seats) do
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new_value =
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if occupied_visible(x, y, seats) == 0 do
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:occupied
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else
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:empty
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end
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{{x, y}, new_value}
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end
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def toggle(:occupied, x, y, old_seats, new_seats) do
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if occupied_visible(x, y, old_seats) >= 5 do
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Map.put(new_seats, {x, y}, :empty)
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else
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Map.put(new_seats, {x, y}, :occupied)
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end
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def toggle(:occupied, x, y, seats) do
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new_value =
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if occupied_visible(x, y, seats) >= 5 do
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:empty
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else
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:occupied
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end
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{{x, y}, new_value}
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end
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def toggle(:floor, x, y, _, new_seats), do: Map.put(new_seats, {x, y}, :floor)
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def toggle(:floor, x, y, _), do: {{x, y}, :floor}
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def occupied_visible(x, y, seats) do
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directions = [
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@ -83,38 +78,24 @@ defmodule Day11Part2 do
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end
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def parse_seat_plan(input) do
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Enum.reduce(input, {0, 0, %{}}, fn row, {_x, y, seats} ->
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{x, seats} =
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Enum.reduce(row, {0, seats}, fn seat, {x, seats} ->
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seat =
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case seat do
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?L -> :empty
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?. -> :floor
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?# -> :occupied
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end
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{_, seats} =
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Enum.reduce(input, {0, %{}}, fn row, {y, seats} ->
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{_, seats} =
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Enum.reduce(row, {0, seats}, fn seat, {x, seats} ->
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seat =
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case seat do
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?L -> :empty
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?. -> :floor
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?# -> :occupied
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end
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{x + 1, Map.put(seats, {x, y}, seat)}
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end)
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{x + 1, Map.put(seats, {x, y}, seat)}
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end)
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{x, y + 1, seats}
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end)
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end
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{y + 1, seats}
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end)
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def visualize({width, height, seats}) do
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for y <- 0..(height - 1) do
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for x <- 0..(width - 1) do
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char =
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case seats[{x, y}] do
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:empty -> "L"
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:floor -> "."
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:occupied -> "#"
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end
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IO.write(char)
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end
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IO.write("\n")
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end
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seats
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end
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end
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