Demonstrate the classes in a program that has an array of Ship pointers. Your program will read in a list of Ship, CruiseShip and CargoShip objects from a comma delimited file (see below). The name of that file will be passed in as a command line argument. It will parse each line read and create the appropriate dynamically allocated Ship, cruiseShip or CargoShip objects. The program should then sort the array by the name of the ship. Then the program should step through the array three times, printing just the ships first, then the CargoShip's, then the CruiseShips.

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Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

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