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!
Find best placement for ordered dominoes (harder)
Multiples of a Number in a Given Range
Area of an Isoceles Triangle
Dots in a Diamond
Triangular Tiling Dots in a Circle
Shifted Hexagonal Tiling Dots in a Circle
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