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绘制一张地图,至少需要用几种颜色才能区分不同区域?
摩根在信中希望哈密尔顿要么能证明“如果一张地图,图上任意分成许多部分,要求有共同边界的两部分涂不同颜色,那么只要4种颜色就够了”,要么构造出一个需要5种或更多种颜色的图来。
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