public DirectedDFS(DiGraph G, IEnumerable <int> Sources)
{
visited = new bool[G.Vertices()];
foreach (var source in Sources)
{
Dfs(G, source);
}
}
private bool[] visited; // visitd[v] = true if v is reachable from source
public DirectedDFS(DiGraph G, int source)
{
visited = new bool[G.Vertices()];
Dfs(G, source);
}