Grokking Data Structures & Algorithms for Coding Interviews
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Solution: Unique Number of Occurrences (easy)
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Problem Statement

Given an array of integers, determine if the number of times each distinct integer appears in the array is unique.

In other words, the occurrences of each integer in the array should be distinct from the occurrences of every other integer.

Examples:

    • Input: [4, 5, 4, 6, 6, 6]
    • Expected Output: true
    • Justification: The number 4 appears 2 times, 5 appears 1 time, and 6 appears 3 times. All these occurrences (1, 2, 3) are unique.
    • Input: [7, 8, 8, 9, 9, 9, 10, 10]
    • Expected Output: false

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