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 shifted symmetry purposes, assume that (0,0) is a grid point.

Neither string operations nor interpolations are allowed!

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Last Solution submitted on Feb 16, 2026

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George Berken Augusto Mazzei Michael Sisco Hoang Minh Tri

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