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Day 11

This commit is contained in:
Shadowfacts 2020-12-11 16:35:19 -05:00
parent fa3b2ea34d
commit 67a750874c
Signed by: shadowfacts
GPG Key ID: 94A5AB95422746E5
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119
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defmodule Day11 do
@example """
L.LL.LL.LL
LLLLLLL.LL
L.L.L..L..
LLLL.LL.LL
L.LL.LL.LL
L.LLLLL.LL
..L.L.....
LLLLLLLLLL
L.LLLLLL.L
L.LLLLL.LL
"""
def part1(example \\ false) do
parse_input(example)
|> find_final_state(&count_adjacent_occupied/3, 4)
|> count_occupied()
end
def part2(example \\ false) do
parse_input(example)
|> find_final_state(&count_visible_occupied/3, 5)
|> count_occupied()
# |> step(&count_visible_occupied/3, 5)
# |> step(&count_visible_occupied/3, 5)
# |> Enum.each(&IO.puts/1)
end
def parse_input(example) do
if(example, do: @example, else: File.read!("lib/day11/input.txt"))
|> String.trim()
|> String.split()
|> Enum.map(&String.to_charlist/1)
end
def find_final_state(map, count_fn, empty_threshold) do
case step(map, count_fn, empty_threshold) do
^map -> map
next -> find_final_state(next, count_fn, empty_threshold)
end
end
def step(map, count_fn, empty_threshold) do
map
|> Enum.with_index()
|> Enum.map(fn {row, row_index} ->
row
|> Enum.with_index()
|> Enum.map(fn {el, col_index} ->
if el == ?. do
?.
else
count = count_fn.(map, row_index, col_index)
case count do
0 -> ?#
c when c >= empty_threshold -> ?L
_ -> el
end
end
end)
end)
end
def count_adjacent_occupied(map, row, col) do
max(0, row - 1)..min(row + 1, length(map) - 1)
# |> IO.inspect()
|> Enum.map(fn test_row ->
# IO.inspect(test_row)
map_test_row = Enum.at(map, test_row)
max(0, col - 1)..min(col + 1, length(map_test_row))
|> Enum.reject(fn c -> test_row == row && c == col end)
|> Enum.count(fn test_col ->
Enum.at(map_test_row, test_col) == ?#
end)
end)
|> Enum.sum()
end
@directions -1..1
|> Enum.flat_map(fn dr ->
-1..1
|> Enum.map(fn dc -> {dr, dc} end)
end)
|> List.delete({0, 0})
def count_visible_occupied(map, row, col) do
Enum.count(@directions, fn {dr, dc} = dir ->
get_visible_seat(map, row + dr, col + dc, dir) == ?#
end)
end
def get_visible_seat(_, -1, _, _), do: nil
def get_visible_seat(map, row, _, _) when row == length(map), do: nil
def get_visible_seat(_, _, -1, _), do: nil
def get_visible_seat(map, _, col, _) when col == length(hd(map)), do: nil
def get_visible_seat(map, row, col, {dr, dc} = dir) do
map
|> Enum.at(row)
|> Enum.at(col)
|> case do
?. ->
get_visible_seat(map, row + dr, col + dc, dir)
el ->
el
end
end
def count_occupied(map) do
map
|> Enum.flat_map(& &1)
|> Enum.count(&(&1 == ?#))
end
end

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LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLL
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLL.LLLLLL.LLLLLLL.LLLLLLL.LLLLL.LLLLL.LLLLLLLLLLLLLLL
LLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLL.LLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLL.LLLLLLLL.LLLLLL
LLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLL
.......L.L.....LL..L....LLL...L...........L.....L...LL...L.....L..LL..L..L.L...L........L.L
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLL.LLLLLLLL.LLLLLL
LLL.LL.LLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLL.LLLLLLLLLLLLLLL
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLL.
LLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLL..LLLLLLL.LLLLLLL.LLLLL.LLLLL.LLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLL.LLLLLL.LLLLLLL.LLLLLLL.LLLLL.LLLLL.LLLLLLLLLLLLLLL
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLL.LLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLL
LLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLLLL.LL.LLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLL.LLLLLLLL.LLLLLL
LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLL.LLLLLLLL.LLLLLL
L.LLL..L...L.L.......L....L..LLL........LLL..L..L....LLLLLLL.......L.L...L........LL.L..L..
LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLL.LLLLLLLLLLLLLLL
LLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLL.LLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLLL.LLLLL.LLLLL.LLLLLLLL.LLLLLL
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LLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLL.LLLLL.LLLLLLLLLLLLLLL
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LLLLLLL.LL.LLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLL.LL.LLLLLLL.LLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLL
LLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLLL.LLLLLLL.LLLLLLL.LLLLL.LLLLL..LLLLLLL.LLLLLL
LLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLL.L
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LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLL.LLLLLL.LLLLLLL.LLLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLL
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L..........LLL....LL...............L.....L.......L......L..L.L...L..LL.......L..L...L....LL
LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLL..LLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLL.LLL.LLLLLL
LLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLL.LLLLLL.LLLLLLLLLL.LLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLL.LLLLLLLLLLLLLLL
LLLLLL.LLLLLLLLL.LLLLLL.LLLLLLLLLLLLLLLL.LLLLLL.LLLLLLL.LLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLLL
L...L..L..L.L...L..L.L.....L....L..L...L....L.LL..L.L...L.L.LL....LL..L..L......L.L...L..L.
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LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLL.LLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLL
LLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLL.LLLLLL.LLLLLLL.LLLLL.L.LLLLL.LLLLL..LLLLLLL.LLLLLL
LLLLLL.LLLLLLL.L.LLLLLLL.LLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL.LL.LLLLL.LLLLL.LLLLLLLLLLLLLLL
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLL.LLLLLLLLLLLLLLL
....L....L.L..LL.L...LLL.L.L..L........L..L..L....L..LL..L.L....L......LL.L.......L.LL....L
LLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLL.LLLLL.LLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLLLLLLLLLL.LLLL.LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLLLLLLLLL.LLLLLLL.LL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL
LLLLLLLLLLLLLLLL.LLLLL.LLLLL.LLLLL.LLLLL.LLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLL.LLLLLLLL.LLLLLL
LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLL.LLLLLLLL.LLLLLL
LLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLL.LLLLL.LLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLL.LLLLLLLL.LLLLLL
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LLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLL
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LL.LL.LLLLL.LLLLLLLL.LLLLLL
LLLLL..LLLLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLL
LLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLL.LLLLLLLLLLLLLL.LLLLLL
LLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLLL.LLLLLLLLLLLLLLL.LLLLL.LLLLL.LLLLLLLL.LLLLLL
LLLLLL.LLLLLLLLL.LLLLLLLLLLLLLLLLL.LLLLLLLLLLLL.LLLLLLLLLLLLLLL.LLLLL.LLLLL.LLLLLLLL.LLLLLL
L...LLLLLLLL..L....L.L....L...LL..L.LL..L.L.L.L..L....L.....LL.........LL.L.....L.LL..L...L
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