require 'benchmark'

GC.start
m1 = Benchmark.measure do
	1_000_000.times do
		arr = [[1.1, 2.2, 3.3], [4.1, 5.6, 6.8], [7.1, 8.7, 9.0], [10.0, 11.4, 12.6]]
		arr.map{|y| y.map{|z| z.to_i}}
	end
end

GC.start
m2 = Benchmark.measure do
	1_000_000.times do
		arr = [[1.1, 2.2, 3.3], [4.1, 5.6, 6.8], [7.1, 8.7, 9.0], [10.0, 11.4, 12.6]]
		arr.each{|y| y.map!{|z| z.to_i}}
	end
end

puts m1, m2