【单选题】【消耗次数：1】
设某有向图中有n个顶点，则该有向图对应的邻接表中有（）个表头结点。
①
n-1
②
n
③
n+1
④
2n-1
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相关题目
【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。
【多选题】
设 G 是 n (n32)阶 n + 1 条边的无向简单连通图, 则以下哪些性质正确：
①
存在顶点 v, d(v)33；
②
所以顶点度数之和等于2(n + 1)；
③
至少有两个顶点不是割点；
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奇度顶点个数可以不是偶数个。
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essential
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