You are given an n x n grid where we place some 1 x 1 x 1 cubes that are axis-aligned with the x, y, and z axes. Each value v = grid[i][j] represents a tower of v cubes placed on top of the cell (i, j). We view the projection of these cubes onto the xy, yz, and zx planes. A projection is like a shadow, that maps our 3-dimensional figure to a 2-dimensional plane. We are viewing the "shadow" when looking at the cubes from the top, the front, and the side. Return the total area of all three projections. Example 1: Input: grid = [[1,2],[3,4]] Output: 17 Explanation: Here are the three projections ("shadows") of the shape made with each axis-aligned plane. Example 2: Input: grid = [[2]] Output: 5 Example 3: Input: grid = [[1,0],[0,2]] Output: 8 Example 4: Input: grid = [[1,1,1],[1,0,1],[1,1,1]] Output: 14 Example 5: Input: grid = [[2,2,2],[2,1,2],[2,2,2]] Output: 21 Constraints: n == grid.length n == grid[i].length 1 <= n <= 50 0 <= grid[i][j] <= 50