51 lines
799 B
Ruby
51 lines
799 B
Ruby
input = File.readlines('./input').map(&:strip).map(&:chars)
|
|
|
|
$dirs = [
|
|
[-1,-1],
|
|
[-1,0],
|
|
[-1,1],
|
|
[0,-1],
|
|
[0,1],
|
|
[1,-1],
|
|
[1,0],
|
|
[1,1]
|
|
]
|
|
|
|
|
|
def round(map)
|
|
output = []
|
|
map.each_index do |row|
|
|
output << []
|
|
map[row].each_index do |col|
|
|
tmp = $dirs.map do |x, y|
|
|
x_index = row + x
|
|
y_index = col + y
|
|
|
|
next nil if x_index < 0 || y_index < 0
|
|
map[row+x]&.[](col+y)
|
|
end
|
|
occupied = tmp.compact.count('#')
|
|
output[row][col] = case [map[row][col], occupied]
|
|
in ['L', 0]
|
|
'#'
|
|
in ['#', 4..]
|
|
'L'
|
|
else
|
|
map[row][col]
|
|
end
|
|
end
|
|
end
|
|
|
|
output
|
|
end
|
|
|
|
last_hash = 0
|
|
out = input
|
|
|
|
until out.hash == last_hash
|
|
last_hash = out.hash
|
|
out = round out
|
|
end
|
|
|
|
puts out.map{_1.count('#')}.inject(:+)
|