If the DFS finishing time f[u] > f[v] for two vertices u and v in a directed graph G, and u and v are in the same DFS tree in the DFS forest, then u is an ancestor of v in the depth-first tree.
(A)
True
(B)
False
Answer: (B)
Explanation:
In a graph with three nodes, r u, and v, with edges (r; u) and (r; v), and r is the starting point for the DFS, u and v are siblings in the DFS tree, neither as the ancestor of the other.
Hence the above statement si false.
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