The following project is made up of the classes: -Passenger -Single -Family -Group -HeapNode -PrQueue (which implements the priority queue with a max heap) -PrQueueArray (which implements the priority queue with an arrayList) -Run -Main There was no need of other classes like Ticket because its implementation would have done nothing good to the project. The project works as follows: 1) it reads the number of Singles 2) it reads the Singles and appoints them to their intended Group/ Family or they stay as Singles 3) it reads the instructions until EOF and parses them on spot Some words on the Classes, what they are and how some of their methods work: Passenger: -it represents and entity that can be inserted into the priority queue -it's an abstract class which has 3 subclasses: Single, Family and Group -it only implements methods which are to be used by the subclasses -some of the methods are specific for Family/ Group, and they do nothing for Single or viceversa; they are specified in the JavaDoc Single: -it represents a single human being -it dos not have any othem members of type Single Groups: -it is made up of multiple Single instances -it can add/ delete a specific Single Family: *as above* HeapNode: -it represents a single left-right-info cell in which the info is a Passenger -it has a method that can reach a certain heapNode following the notation where 0 is the current heapNode 0 /\ 1 2 /\ /\ 3 4 5 6 -this method is used for an easier implementation of other methods PrQueue: -insert: inserts the last node then heapify -list: list that heap -embark: copy the last node into the root then heapifies -delete: finds the the passegner to be deleted and then delets it -other methods that are used to implement the 4 methods above as this implementation of the priority queue is unnecessarily harder to implement and is to be avoided PrQueueArray: *as above* Run: -this is where they all come together -it has methods for reading the lines and parsing the information opening and closing the input and the output file Main: -you use the Run Class to call the reading and parsing instructions