This problem is looking for the number of vertices on the hexagonal grid inside the circle of radius r. The center of the hexagon is not counted as a point for this problem, and this is true for every hexagon inside the circle.
Find perfect placement of non-rotating dominoes (easier)
Without the French accent please!
Generate a random matrix A of (1,-1)
find radius of cone
Dots in a Diamond
Edges of a n-dimensional Hypercube
Chebyshev polynomials of the 1st Kind
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