Question: Let G = ( V , E ) be a directed graph and let RsubV be a given set of special vertices, let's call them

Let

G = (V, E)

be a directed graph and let RsubV be a given set of special vertices, let's call them the red vertices. Design an algorithm that determines for each vertex vinV whether some red vertex is reachable from

v .

If yes, set

r [v]

to such a reachable red vertex, and if not, set

r [v] = .

The running time of your algorithm should be

O (| V | + | E |) .

Let G=(V,E) be a directed graph and let RsubV be a

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