12/04/25 20:45:17.23
>>531をRubyに翻訳してみた版。1.9だが50世代に4分以上かかってしまう。
翻訳の手間を省くのにArray#*,#+を置き換えちゃったのが足を引っ張ったか？
require "benchmark"
class Array
def *(x); zip(x.kind_of?(Array)?x:Array.new(size,x)).map{|e|e.reduce(&:*)} end
def +(x); zip(x.kind_of?(Array)?x:Array.new(size,x)).map{|e|e.reduce(&:+)} end
end
def life(ary2d)
sum = ary2d * 0
(-1..1).each{ |dx| (-1..1).each{ |dy|
sum += ary2d.map{ |row| row.rotate(dx) }.rotate(dy) } }
survivs = [3,4].map{ |alive| sum.map{ |row| row.map{ |cell| (cell == alive)?1:0 } } }
survivs.first + (survivs.last * ary2d)
end
p life([
[0,1,1,1,0],
[0,1,0,0,0],
[0,0,1,0,0],
[0,0,0,0,0],
[0,0,0,0,0]])
#=> [[0,1,1,0,0],[0,1,0,1,0],[0,0,0,0,0],[0,0,0,0,0],[0,0,1,0,0]]
cells = (1..500).map{ (1..500).map{ [0,1].sample } }
p Benchmark.measure{ 50.times{ cells = life(cells) } }