Atcoder Nikkei Contest Problem D

Revision en1, by boocoo, 2019-01-30 00:02:12

I'm having trouble understanding the statement of problem D of the Nikkei contest (https://atcoder.jp/contests/nikkei2019-qual/tasks/nikkei2019_qual_d?lang=en). It says that the original tree is unique, but for the first sample case, the original tree can also be 1 -> 2 and 1 -> 3, right?

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en1 English boocoo 2019-01-30 00:02:12 321 Initial revision (published)