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Grokking the Coding Interview Patterns in JavaScript

Solution: Unique Number of Occurrences

Understand how to apply hash maps and hash sets to verify if every value in an array has a distinct number of occurrences. This lesson guides you through the algorithm, time and space complexity, and implementation details for solving this problem in JavaScript.

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

Solution

The algorithm checks if there is a unique number of ...