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Return how many Hexagonal Tiling grid points there are inside a circle of radius *r* centred at (0,0) (including points on the edge). Assume that a Hexagonal Tiling grid is a 2D Regular Hexagonal Tessellation with equal edges of size *e*=1.

For symmetry purposes, assume that (0,0) point is a *vacancy*; i.e., there *are* points at (±1,0), (±1/2,±√3/2), etcetera.

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

10 correct solutions
4 incorrect solutions

Last solution submitted on May 14, 2015