LeetCode 1207: Unique Number of Occurrences - Interview Prep Ep 17

LeetCode 1207. Unique Number of Occurrences

Solution explained:

1. We use a HashMap to hold all the elements in this given array:
a. the key of the HashMap is the each of the value of the given array,
b. the value of the HashMap is the number of occurrences of each of the value in this array.
2. After one loop, we can iterate through this given array and build up this HashMap for our use, then we could simply check whether all values in this HashMap are all distinct or not to return as our answer to solve this question.

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