Data Structures and Algorithms in Python by Michael H. Goldwasser Roberto Tamassia Michael T. Goodrich

Author:Michael H. Goldwasser, Roberto Tamassia, Michael T. Goodrich
Language: eng
Format: epub
Publisher: John Wiley & Sons
Published: 2018-09-25T16:00:00+00:00

A priority queue may have multiple entries with equivalent keys, in which case methods min and remove_min may report an arbitrary choice of item having minimum key. Values may be any type of object.

In our initial model for a priority queue, we assume that an element's key remains fixed once it has been added to a priority queue. In Section 9.5, we consider an extension that allows a user to update an element's key within the priority queue.

Example 9.1: The following table shows a series of operations and their effects on an initially empty priority queue P. The “Priority Queue” column is somewhat deceiving since it shows the entries as tuples and sorted by key. Such an internal representation is not required of a priority queue.

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