继上次的硬币游戏(解答在此)之后,Sariel又出了一个有意思的题目。
给定平面上若干个点。证明总存在一个黑白染色方法,使得对于平面上任何一个直线,若此直线这一侧有多于50个点,则此侧的点颜色不完全一样。
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Ph.D Candidate from iTCS & CASTU, Tsinghua Univeristy, major in Applied Mathematics (Theoretical Computer Science)
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答案呢?