对有n个结点、e条边且采用数组表示法（即邻接矩阵存储）的无向图进行深度优先遍历，时间复杂度为（ ）。
- A.O（n2）
- B.O（e2）
- C.O（n+e）
- D.O（n*e）
正确答案及解析
正确答案
解析
在邻接表中，就是要依次访问每个顶点，然后在每个顶点中依次访问每条边，把这些边的终点的入度+1。也就是每个顶点和每条边依次要各访问一遍，所以时间复杂度是O（n+e）。在邻接矩阵中，算法需要遍历邻接矩阵×n个点，所以时间复杂度是O（n×n）。
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