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.
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.