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Grokking the Coding Interview Patterns

Solution: Unique Number of Occurrences

Understand how to use hash maps and hash sets to verify whether each number in an array appears a unique number of times. Learn to implement this algorithm with O(N) time complexity and analyze its efficiency in handling array data.

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 occurrences ...