Question: (a) Assume that we ran DFS on a digraph G, and obtained a directed spanning forest F. We are interested in the set R of

(a) Assume that we ran DFS on a digraph G, and obtained a directed spanning forest F. We are interested in the set R of vertices reachable from a given fixed vertex a V (G).

(i) Show in general R cannot be obtained from F. (ii) How must we modify the operation of DFS on G, so that we can obtain R from F? Also explain how to obtain R.

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