more robust and easier to understand. #892
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Boundary Check: Added a boundary check for k in the main function to ensure it is within valid range.
Return Value for Out of Bounds: Added a return value of INT_MAX if k is out of bounds in the find_kth_smallest function.
Vector Usage: Used vector for dynamic array allocation, which is safer and more modern C++ practice.
Simplified Partition Logic: Improved the readability of the partition logic.