推 Panthalassa: 極致一點的話，海也算一色XD 03/24 22:47
推 cutter1010: 有趣 03/27 01:21
https://imgur.com/cjaeEFI
剛好推特上看這圖~ 回想起以前離散數學的四色繪圖理論XD
https://www.wikiwand.com/en/Four_color_theorem
Four colours can be used to colour all the countries of the world,
so that no two adjacent countries share the same colour.
版本有點舊，Reddit鄉民在底下戰克里米亞半島之類的
至於台灣嘛...一目了然
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