I had a revelation during my biology exam: every vertex in an unrooted tree should be called a "seed"; it has the potential to become a root, but it's not the root yet.
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Codeforces Round 940 (Div. 2) and CodeCraft-23
40:48:35
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Codeforces Round 940 (Div. 2) and CodeCraft-23
40:48:35
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