1. What advantage does a circular linked structure with a dummy header node give the programmer? 2 Describe one benefit and one cost of a doubly linked structure, as compared to a singly linked structure.
3. Examples of linear collections are
a sets and trees
b lists and stacks
4. Examples of unordered collections are
a queues and lists
b sets and dictionaries
5 .A hierarchical collection can represent a
a line of customers at a bank
b a file directory system
