public void TestDirected_DFS()
{
var graph = new MatrixGraph(GraphTypes.Directed, 7);
graph.AddEdge(0, 1);
graph.AddEdge(0, 3);
graph.AddEdge(1, 2);
graph.AddEdge(1, 3);
graph.AddEdge(1, 4);
graph.AddEdge(2, 0);
graph.AddEdge(2, 4);
graph.AddEdge(3, 2);
graph.AddEdge(4, 5);
graph.AddEdge(5, 6);
graph.AddEdge(6, 3);
var print = graph.PrintDFS(0);
}