olymmath

OIM 2018 Problem 3

    In a plane we have nn lines, no two of which are parallel or perpendicular, and no three of which are concurrent. A cartesian system of coordinates is chosen for the plane with one of the lines as the xx -axis. A point PP is located at the origin of the coordinate system and starts moving along the positive xx -axis with constant velocity. Whenever PP reaches the intersection of two lines, it continues along the line it just reached in the direction that increases its xx -coordinate. Show that it is possible to choose the system of coordinates in such a way that PP visits points from all nn lines.

    Dataset text AI-MO AoPS. Quoted with source.

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