Return how many integer grid points there are inside a 3D sphere of radius r centred at (0,0,0) (including points on the edge).
Neither string operations nor interpolations are allowed!
Times 2 - START HERE
Who invented zero?
Mirror Image matrix across anti-diagonal
Shifted Hexagonal Tiling Dots in a Circle
Edges of a n-dimensional Hypercube
Dots in a Diamond
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