Question: In a directed graph, the indegree of a node is the number of incoming edges and the outdegree is the number of outgoing edges. Show

In a directed graph, the indegree of a node is the number of incoming edges and the outdegree is the number of outgoing edges. Show that the following problem is NP-complete. Given an undirected graph G and a designated subset C of G’s nodes, is it possible to convert G to a directed graph by assigning directions to each of its edges so that every node in C has indegree 0 or outdegree 0, and every other node in G has indegree at least 1?

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