$1 = 0
while($1*$1 <= (H * W) * (H*W))
	$2 = $1/W + 1
	$3 = $1%W + 1
	$1 = (A[$1/W + 1,$1%W + 1]-B[$1/W + 1,$1%W + 1]) * 1000000000
end
return($2,$3)