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!
Arrange Vector in descending order
Max index of 3D array
05 - Vector Equations 1
Shifted Hexagonal Tiling Dots in a Circle
Triangular Tiling Dots in a Circle
Hexagonal Tiling Dots in a Circle
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