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!

Solve

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Last Solution submitted on Feb 16, 2026

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George Berken Augusto Mazzei Mehdi Dehghan Hoang Minh Tri

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