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SleeplessByte/aoc-2020-d11.rb

Last active December 11, 2020 06:34
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Advent of Code 2020: Day 11 - Seating System
Raw
aoc-2020-d11.rb
require 'benchmark'
class Seat
def initialize(mark)
self.mark = mark
self.next_mark = mark
end
def valid?
mark != 'X'
end
def empty?
mark == 'L'
end
def occupied?
mark == '#'
end
def floor?
mark == '.'
end
def invalid?
mark == 'X'
end
def seat?
occupied? || empty?
end
def to_s
mark
end
def prepare_to_dance!
if occupied?
self.next_mark = 'L'
elsif empty?
self.next_mark = '#'
end
self
end
def will_it_flip?
self.next_mark != mark
end
def do_the_shuffle!
self.mark = next_mark
end
private
attr_accessor :mark, :next_mark
end
class SeatingGrid
def self.from_lines(grid)
height = grid.length
width = grid[0].chomp.length
gridline = grid.map(&:chomp).join('')
SeatingGrid.new(gridline, width: width, height: height)
end
def initialize(gridline, width:, height:)
self.seats = gridline.chars.map { |x| Seat.new(x) }
self.width = width
self.height = height
self._adjacency = {}
self._visually_adjacent = {}
self._visually_at = {}
end
def at(x, y)
return Seat.new('X') if x < 0 || x >= width || y < 0 || y >= height
self[y * width + x]
end
def visual_at(x, y, direction:)
memoized = _visually_at["#{x}.#{y}"]
return memoized if memoized
seat = at(x, y)
if seat.seat? || seat.invalid?
_visually_at["#{x}.#{y}"] = seat
return seat
end
visual_at(
x + direction.first,
y + direction.last,
direction: direction
)
end
def [](i)
seats[i]
end
def adjacent(x, y)
memoized = _adjacency["#{x}.#{y}"]
return memoized if memoized
_adjacency["#{x}.#{y}"] = [
at(x - 1, y - 1), # top left
at(x , y - 1), # top
at(x + 1, y - 1), # top right
at(x + 1, y ), # right
at(x + 1, y + 1), # bottom right
at(x , y + 1), # bottom
at(x - 1, y + 1), # bottom left
at(x - 1, y ), # left
].select(&:seat?)
end
def visual_adjacent(x, y)
memoized = _visually_adjacent["#{x}.#{y}"]
return memoized if memoized
_visually_adjacent["#{x}.#{y}"] = [
visual_at(x - 1, y - 1, direction: [-1, -1]), # top left
visual_at(x , y - 1, direction: [ 0, -1]), # top
visual_at(x + 1, y - 1, direction: [ 1, -1]), # top right
visual_at(x + 1, y , direction: [ 1, 0]), # right
visual_at(x + 1, y + 1, direction: [ 1, 1]), # bottom right
visual_at(x , y + 1, direction: [ 0, 1]), # bottom
visual_at(x - 1, y + 1, direction: [-1, 1]), # bottom left
visual_at(x - 1, y , direction: [-1, 0]), # left
].select(&:seat?)
end
def prepare_to_dance!(x, y)
at(x, y).prepare_to_dance!
end
def each
(0..width).each do |x|
(0..height).each do |y|
seat = at(x, y)
yield x, y, seat if seat.seat?
end
end
end
def visualize
gridline
.chars
.each_slice(width)
.map(&:join)
.join("\n")
end
def occupancy
seats.count(&:occupied?)
end
def dance!
seats.each(&:do_the_shuffle!)
end
private
attr_accessor :seats, :width, :height
attr_accessor :_adjacency, :_visually_adjacent, :_visually_at
end
def simulate(grid, adjacency:, packed_when:, verbose: false)
rules = {}
rules[-> (seat) { seat.empty? }] = -> (adjacents) { !(adjacents.any? { |a| a.occupied? }) }
rules[-> (seat) { seat.occupied? }] = -> (adjacents) { !(adjacents.count { |a| a.occupied? } < packed_when) }
iteration = 0
loop do
changes = 0
iteration += 1
grid.each do |x, y, seat|
next if seat.floor?
rule = rules.find { |k, _| k.(seat) }
next unless rule
adjacents = adjacency.(grid, x, y)
next unless rule.last.(adjacents)
changed = grid.prepare_to_dance!(x, y).will_it_flip?
changes += changed ? 1 : 0
end
grid.dance!
if verbose
puts "[#{iteration}] #{changes} changes"
puts
puts grid.visualize
puts ""
puts ""
end
if changes.zero?
puts "==============================" if verbose
puts "Seats taken: #{grid.occupancy}"
break
end
end
end
source = 'input.txt'
Benchmark.bmbm do |x|
x.report('part 1') do
grid = SeatingGrid.from_lines(File.readlines(source))
simulate(
grid,
adjacency: -> (grid, x, y) { grid.adjacent(x, y) },
packed_when: 4,
)
end
x.report('part 2') do
grid = SeatingGrid.from_lines(File.readlines(source))
simulate(
grid,
adjacency: -> (grid, x, y) { grid.visual_adjacent(x, y) },
packed_when: 5
)
end
end
Raw
example.txt
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
Raw
input.txt
LLLLL.LLL.LLLLLLLLLLLLLLL.LLLLLLLLL.LLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL.LLLLL
LLLLLLLLL.LLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLL.LLLLLL.L.LLLL.LLL.L.LLLLL
LLLLLLLLL.LLLLLL.L.LLLLLL.LLLLLLLLL.LLLL...LLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLLLLLLLL.LLLLL.LLLLL
LLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLL.L.LLLLLL.LLLLLLLLLLLLLLLL
LLLLLLLLLLLLLLL..LLLLLL.LLLLLLLLLLLLLLLLL..LLLLLL.LLLLLLL.LLLLLLL.LLLLL.LLLLLLLL.LLLL.LLLLLLLLLLL
LLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLL.LLLLL.LLLLLLL.LL.LLLL.LLLLLLL.LLLLL.LLLLLLLLLLLLL.LLLLLLLLLLL
LLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLL.LLLLLLLLLLLLLLL..LLLLLLLLLLLLL.LLLL.LLLLLLLLLLL
LLLLLLLLL.LLLLLLL.L.LLLLL.LLLLLLLLL.LLLLL.LLLLLLL.LLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLL.LLLLLLLLLLL
LLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLL.LLLLL.LLLLLLLL.LLLL.LLLLL.LLLLL
L.LL...L..L.L...L...L..L...L.....L....LL..L.LLLL..LL.LL..LLL.L..LL....L..L....L...LL..LL.......L.
LLLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLL.LLLLLLL.LLLLLLL.LLLLLLLLLLLLL.LLLLLLLL.LLLL..LLLL.LLLLL
LLLLLLLLL.LLLLLL.LLL.LLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLLLLLLLLLLLLLL.LLLLLLL.LLL
LLLLLLLLL.LLLLLL.LLLLLLLL.LLLLLLLLL.LLL.LLLLLLLLL.LLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLLLL.LLLL
LLLLLLLLLLLLLLLL.LLLLLLLLLLLLLLLLLL.LLLLL.LLLLLLL.L.LLLLL.L.LLL.L.LLLLL.LLLLLLLLLLLLL.LLLLLLLLLLL
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LLLLLLLLL.LLLLLL.LLLLLLL..LLLLLLLLLLLLL.LLLLLLLLL.LLLLLLL.LLLLLLL.LLLLL.LLLLL.LL.LLLL.LLLLL.LLLLL
LLLLLLL.L.LLLLLL.LLLLLLLL.LLLLLLLLL.LLL.L.LLLLLLLLLLLLLLL.LLLLLLL.LLLLL.LL.LLLLLLLLLLLLLLLLLLLLLL
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LLLLL.LLL.LLLLLLLL.LLLLLL.LLLLLLLLL.LLL.L.LLLLLLL.LLLLLLL.LLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLLLLLLLLL
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.LLLLLLLLLLLLLLL.LLLLLLLL.LLLLLLLLL.LLLLLLLL.LLLLLLLLLLLLLLLLLLLLLLLLLL.LLLLLLLL.LLLL.LLLLL.LLLLL
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