Unique Number of Occurrences

Try to solve the Unique Number of Occurrences problem.

We'll cover the following

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:

  • 11<= nums.length <=10001000

  • −1000-1000 <= nums[i] <= 10001000

Examples

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