Question: Let G = (V, E) be a directed graph with nodes V = {1, 2, 3, ..., n}. For each vertex u ? V ,

Let G = (V, E) be a directed graph with nodes V = {1, 2, 3, ..., n}. For each vertex u ? V , let R(u) = {v ? V |u v} be the set of vertices that are reachable from u. Define min(u) as the lowest numbered node reachable from u. Give an O(V + E) time algorithm that computes min(u) for all vertices u ? V .

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