Question: Let G be an undirected, connected graph, where each vertex has an additional attribute called v . color, which may be either black or white.

Let G be an undirected, connected graph, where each vertex has an additional attribute called v.color, which may be either black or white.
Your job is to update DFS-visit(u) so that it counts the total number of black nodes in the graph.
The procedure must return the total number of black nodes. Justify the runtime of O(V + E).

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