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 ( 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)