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TUYMAADA 2022 J4

  • Junior

Several goodgood points, several badbad points and several segments are drawn in the plane. Each segment connects a goodgood point and a badbad one; at most 100100 segments begin at each point. We have paint of 200200 colors. One half of each segment is painted with one of these colors, and the other half with another one. Is it always possible to do it so that every two segments with common end are painted with four different colors? (M. Qi, X. Zhang)

Dataset text AI-MO AoPS. Quoted with source.

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