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Yes, variations of this problem frequently appear in FAANG-style interviews. It tests understanding of sliding window patterns, array traversal, and how to maintain constraints while scanning a sequence.
The optimal approach uses a sliding window that allows at most one zero inside the window. As you expand the window, you track the number of zeros and shrink the window when it exceeds one. This ensures you always maintain the longest valid subarray of 1s with a single flip.
Yes, the optimal solution uses constant extra space. By maintaining only pointers and a zero counter while traversing the array, you can compute the longest valid segment in O(1) space.
The problem can be solved using simple variables and two pointers without complex data structures. A sliding window with left and right pointers is enough to track the current segment and maintain the zero count efficiently.