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Asked in my Adobe OA last week. A single pass with a running value is enough here. Keep track of the best answer so far and update it as you scan, which gives O(n) time and O(1) extra space.

Simple approach explained for beginners. A single pass with a running value is enough here. Keep track of the best answer so far and update it as you scan, which gives O(n) time and O(1) extra space.