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Return how many Diamond Cubic lattice grid points there are inside a 3D sphere of radius *r* centred at (0,0,0) (including points on the edge).

Set the distance between two adjacent lattice grid points to be *e* =1. In addition, assume that (0,0,0) is a grid point.

Neither **string operations** nor **interpolations** are allowed!

4 correct solutions
2 incorrect solutions

Last solution submitted on Mar 18, 2014