Question: Consider the Hamiltonian Cycle problem for undirected graphs. Define an equivalent problem, called D-Hamiltonian Cycle, for directed graphs (i.e., given a directed graph, does it

Consider the Hamiltonian Cycle problem for undirected graphs. Define an equivalent problem, called D-Hamiltonian Cycle, for directed graphs (i.e., given a directed graph, does it contain a cycle that visits every node exactly once?). Show that D-Hamiltonian Cycle is NP-Complete.

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