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Problem 1459. Triangular Tiling Dots in a Circle

Created by Yaroslav

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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Solution Statistics

16 correct solutions 9 incorrect solutions
Last solution submitted on Sep 06, 2014