Solution: Unique Number of Occurrences

Statement

Given an array of integers nums, return TRUE if each value in the array has a unique number of occurrences; otherwise, return FALSE.

Constraints:

• $1$<= nums.length <=$1000$

• $-1000$ <= nums[i] <= $1000$

Solution

The algorithm checks if there is a unique number of occurrences of each element by using a hash map and a hash set. First, for each ...