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Yes, K Empty Slots is considered a challenging problem and has appeared in technical interviews at large tech companies. It tests array manipulation, window techniques, and understanding of advanced data structures.
The days array maps each position to the exact day its flower blooms. This transformation makes it easier to compare bloom times across positions and apply window-based validation efficiently.
The optimal approach converts the bloom order into a days array and applies a sliding window technique. By checking whether flowers inside the window bloom later than the boundaries, we can efficiently find valid windows in O(n) time.
For the most efficient solution, a sliding window with a precomputed bloom-day array works best. However, ordered sets, segment trees, or binary indexed trees can also be used to track neighboring blooms dynamically.