Perhaps I’ve misunderstood the problem, but the second solution shown here doesn’t seem to be correct: it always adds a trailing 0-height entry to the skyline,

Perhaps I’ve misunderstood the problem, but the second solution shown here doesn’t seem to be correct: it always adds a trailing 0-height entry to the skyline, yet there could be an existing building touching or overlapping the newly added building, whose height is then lost. For example, the code given appears to make skyline [(1, 2, 3), (2, 1, 4)] evaluate to [(1,2),(3,0),(4,0)] when if I’ve understood correctly it should be [(1,2),(3,1),(4,0)]