Write a method countUnique that accepts a list of integers as a parameter and returns the number of unique integer values in the list. Use a set as auxiliary storage to help you solve this problem....

Write a method countUnique that accepts a list of integers as a

parameter and returns the number of unique integer values in the list.

Use a set as auxiliary storage to help you solve this problem. For

example, if a list contains the values [3, 7, 3, –1, 2, 3, 7, 2, 15,

15], your method should return 5. The empty list contains 0 unique

values.