Search⌘ K
AI Features
Home
Courses
Grokking the Coding Interview Patterns in C++

Solution: Unique Number of Occurrences

Explore how to implement a hash map and hash set to check if each value in an integer array has a unique number of occurrences. Understand the approach that counts element frequencies, stores them uniquely, and compares sizes to decide the result efficiently.

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 ...