olymmath

ÖMO 2020 Problem 2

    In the plane there are 20202020 points, some of which are black and the rest are green. For every black point, the following applies: There are exactly two green points that represent the distance 20202020 from that black point. Find the smallest possible number of green dots.

    (Walther Janous)

    Dataset text AI-MO AoPS. Quoted with source.

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