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!
Back to basics 4 - Search Path
Basics: 'Find the eigenvalues of given matrix
Generate a random matrix A of (1,-1)
Triangular Tiling Dots in a Circle
Hexagonal Tiling Dots in a Circle
Chebyshev polynomials of the 2nd Kind
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