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Given an n×n grid of tower heights, compute the total exposed surface area of the glued unit cubes by summing top/bottom and side faces for each nonzero tower and subtracting faces that become internal where towers touch (horizontal overlaps equal to the min height between adjacent cells and internal vertical faces within a tower).
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Leetcode 892. Surface Area of 3D Shapes
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Source snapshot: Nov 12, 2026
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