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[组合] 每个由凸形状的国家组成的平面地图可用三种色染？

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isee Posted 2017-9-15 16:37 |Read mode

证明或否定：每个由凸形状的国家组成的平面地图可以用三种颜色染色。

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abababa Posted 2017-9-15 20:50

回复 1# isee
觉得是不能，比如下面这个图：

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Author| isee Posted 2017-9-15 22:39

回复 2# abababa

此题亦被秒

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