Unique Occurrences Question 2 of 4 Medium Given a list of integers nums, return whether the number of occurrences of every value in the array is unique.

Note: Numbers can be negative.

Constraints

0 ≤ n ≤ 100,000 where n is the length of nums Example 1 Input nums = [5, 3, 1, 8, 3, 1, 1, 8, 8, 8] Output true Explanation There's 1 occurrence of 5, 2 occurrences of 3, 3 occurrences of 1, and 4 occurrences of 8. All number of occurrences are unique. Example 2 Input nums = [-3, -1, -1, -1, -2, -2] Output true Explanation There's 1 occurrence of -3, 2 occurrences of -2, and 3 occurrences of -1. All number of occurrences are unique. Example 3 Input nums = [3, 1, 1, 2, 2, 2, 3] Output false Explanation There are 2 occurrences of 1, and 2 occurrences of 3. So the number of occurrences here is not unique.