Do we paint the vertices or the edges? - NISHIO Hirokazu's Scrapbox (Auto-translated from Japanese)

Do we paint the vertices or the edges?

https://gyazo.com/c4a6f4511b8fe6c3a1fb93a59a34d4eb

Note that end is not included in the edge painting.

Tree edges correspond to vertices other than roots, so vertices can have "edge color" between them and their parents

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