Problem Statement
Find kth smallest element in array.
Approach
Use max-heap of size k. Or quickselect algorithm.
Time & Space Complexity
Time O(n log k) or O(n) average.

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Find kth smallest using heap or quickselect.
Find kth smallest element in array.
Use max-heap of size k. Or quickselect algorithm.
Time O(n log k) or O(n) average.
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