Given a 2D array which represents a landscape, true being sea and false being land find the maximum possible height of the land. The height of a sea cell is 0 and height of a land cell is +1 or -1 from its neigbouring cells. It is possible for two neighbouring land cells to have the same height. Neighboring cells are only the horizontal and vertical neighbours.\n\n```\nlandscape =  t f f f f f\n             f f f f f f\n             f f f f f f\n             f f f f f f\n             f f f f f t\n\nCells [0, 5] and [4, 0] have max height 4.\n```

Given a 2D array which represents a landscape, true being sea and false being land find the maximum possible height of the land. The height of a sea cell is 0 a