implement and use one such data structure.

You have a model , headrs and documents. You just implement the methods.
Vehicles and customers are localized using GPS devices available in mobile phones, and these devices determine the longitude and latitude coordinates as floating-point numbers. To simplify the task, however, we will divide the geographical area under consideration into small cells and use integers to identify each location on the map. There is text file to check the out put of the main , the file's name is (Main-Output) .