Coding Question: Find duplicates in an array

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Find the duplicates elements in an array of size N in Java:
- We first talk about a brute force solution that iterates N times through the array.
- Then we talk about a sorting solution.
- Finally, we solve the question using a HashSet which yields an O(N) time complexity and O(N) space complexity.
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Short Note: There's not just only one alex

Joshrivers