Answer by Sebastian Kasperski for I have a differential robot, with a laser Hokuyo, and I want my robot to cover the whole part of a map. I saw that there is some algorithms but I can't find a code. So have someone already implement such algorithms? Thank you

Do you have a map already or do you want to build a complete map of your environment? In the latter case, you could try the exploration module from: http://wiki.ros.org/nav2d It completely explores an unknown environment and builds a map using 2D Laser-Scanner.