I identified this as a variation of the Next Greater Element (NGE) problem. I explained that a building has a view if there is no taller building to its right. I used a Monotonic Decreasing Stack to solve this: as we iterate through the buildings from left to right, whenever we encounter a building taller than or equal to the building at the top of the stack, we pop from the stack because the new building blocks its view. The indices remaining in the stack at the end represent the buildings with an ocean view. This approach runs in O(N) time and O(N) space.