HW2_recursion.pdf - COSC 2320 Data Structures Homework 2...

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COSC 2320: Data Structures Homework 2: Union and Intersection of Doubly Linked Lists using Recursion Deadline: Oct. 11, 2014 1. INTRODUCTION You will write a C++ program to find the intersection and/or union of two doubly linked lists using recursion. You are not allowed to use the STL Library to implement linked list . A set is a collection of distinct entities regarded as a unit, being either individually specified or (more usually) satisfying specified conditions. In set theory the union of two sets A and B, is the set of all distinct elements in A and B. The intersection of two sets A and B is the set that contains all elements of A that also belong to B (or equivalently, all elements of B that also belong to A), but no other elements. In mathematics, the notion of bag (or multiset) is a generalization of the notion of set in which members are allowed to appear more than once. For this homework we will work with bags. 2. INPUT & OUTPUT The input of the program is a text file with multiple commands to be executed by the program, one command per line. The commands are defined as follows: Read [ file name ] [ list name ] Read the specified file from disk and insert each word in the file into a doubly linked list named as [ list name ] . The file specified in this command, if exists, will be a text file, with an unbounded number of different words (case-sensitive) in ALPHABETICAL ORDER , separated by spaces, commas or periods. The input file can have several lines terminated by carriage returns. You can assume words will be at most
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