RU-SPB 2018 Problem 97
- Grade 9
In square we choose cells. In every chosen cell we draw one arrow from the angle to opposite angle. It is known, that for any two arrows, or the end of one of them coincides with the beginning of the other, or the distance between their ends is at least 2. What is the maximum possible value of ?
Dataset text AI-MO AoPS. Quoted with source.
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