class SimpleMatrix < Array
	def initialize(w, h, val = 0)
		@w = w
		@h = h
		super(w * h, val)
	end
  
	def invCoord(x)
		return [x % @w, (x / @w).floor]
	end
  
	def coord(a, b)
		return (b * @w + a)
	end
  
	def get(a, b)
		self[coord(a, b)]
	end
  
	def put(a, b, x)
		self[coord(a, b)] = x
	end
	
	def eachCoord
		self.each_index do |x|
			yield [invCoord(x), self[x]]
		end
	end
end

=begin
a = SimpleMatrix.new(10, 10)

puts a.get(9, 9)
a.put(5, 6, 15)
puts a.get(5, 6)
#a.each do |x| 
#	puts x
#end
puts "---"
puts a.invCoord(9)
puts "---"
puts a.invCoord(10)
puts "---"
a.eachCoord do |x|
	puts "---"
	puts x
end
=end