【单选题】【消耗次数：1】
设无向图G中有n个顶点e条边，则其对应的邻接表中的表头结点和表结点的个数分别为（）。
①
n，e
②
e，n
③
2n，e
④
n，2e
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【简答题】
设某有向图的邻接表中有n个表头结点和m个表结点，则该图中有[填空1]条有向边。
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