A directed rooted tree refers to a directed tree which has one vertex with out-degree 0 and all the other vertices with out-degree 1.
有向根树就是只有一个顶点的出度为0，其余顶点的出度均为1的有向树。
A directed rooted tree refers to a directed tree which has one vertex with out-degree 0 and all the other vertices with out-degree 1.
有向根树就是只有一个顶点的出度为0，其余顶点的出度均为1的有向树。
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