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DAG
- 若在DGA图中存在一个顶点r,在r和图中所有其他顶点之间均存在由r出发的有向路径,则称该DAG图有根,试编写求DAG图的根的算法。 -If there is a DGA map vertex r, in r and the graph all the other vertices exist in between the departure from the r to the path are said to have roots in the DAG plans, test plans p