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Grokking the Coding Interview Patterns in C++

Solution: Unique Number of Occurrences

Understand how to use hash maps and hash sets in C++ to check if every number in an array occurs a unique number of times. This lesson helps you apply hashing techniques to solve the problem efficiently with linear time complexity and clear space usage.

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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 ...