Return how many Triangular Tiling grid points there are inside a circle of radius r centred at (0,0) (including points on the edge).
Assume that a Triangular Tiling grid is a 2D Hexagonal Bravais lattice with | a1 | = | a2 | = 1 and φ = 120°.
Neither string operations nor interpolations are allowed!
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This problem set has so many problems about dots that I'm starting to see spots in my vision.