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!
Connect Four Win Checker
Get the area codes from a list of phone numbers
2 b | ~ 2 b
Permute diagonal and antidiagonal
Chebyshev polynomials of the 2nd Kind
Radial Zernike polynomials
Volume of a Simplex
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