Question: Exercise 4 (Topological Sort with pre numbers) To topologically sort a graph G, we run DFS and then sort the vertices in reverse order of

Exercise 4 (Topological Sort with pre numbers) To topologically sort a

Exercise 4 (Topological Sort with pre numbers) To topologically sort a graph G, we run DFS and then sort the vertices in reverse order of their post numbers. Suppose we use the pre numbers instead. Give a counterexample showing that this does not always produce a topological sort

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