Question: Use Exercise 60 to construct an algorithm for determining whether a directed graph contains a circuit. In exercise Show that if G is a directed

Use Exercise 60 to construct an algorithm for determining whether a directed graph contains a circuit.
In exercise
Show that if G is a directed graph and T is a spanning tree constructed using depth-first search, then G contains a circuit if and only if G contains a back edge (see Exercise 51) relative to the spanning tree T .

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