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Grokking the Coding Interview Patterns in C++

Solution: Unique Number of Occurrences

Understand how to determine if each value in an integer array has a unique number of occurrences by using a hash map to count frequencies and a hash set to verify uniqueness. Explore this efficient O(n) time complexity solution and learn how to implement it step-by-step in C++.

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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 ...