Exemplo n.º 1
0
class TestGraph(unittest.TestCase):

    def setUp(self):
        self.undirected = UndirectedGraph()
        self.undirected.add_edge(1, 2, 2)
        self.undirected.add_edge(1, 3, 6)
        self.undirected.add_edge(2, 3, 3)
        self.undirected.add_edge(2, 4, 1)
        self.undirected.add_edge(3, 4, 1)
        self.undirected.add_edge(3, 5, 4)
        self.undirected.add_edge(4, 5, 6)

        self.directed = DirectedGraph()
        self.directed.add_edge(1, 2, 2)
        self.directed.add_edge(1, 3, 6)
        self.directed.add_edge(2, 3, 3)
        self.directed.add_edge(2, 4, 1)
        self.directed.add_edge(3, 4, 1)
        self.directed.add_edge(3, 5, 4)
        self.directed.add_edge(4, 5, 6)

    def test_get_edges(self):
        assert self.undirected.get_all_edges() == self.directed.get_all_edges()
        assert self.undirected.get_vertices() == self.directed.get_vertices()

    def test_directed_graph(self):

        assert len(self.directed.get_successive_vertices(4)) == 1

        assert len(self.undirected.get_successive_vertices(4)) == 3

        assert self.undirected.edge_exists(4, 3)
        assert not self.directed.edge_exists(4, 3)

        self.directed.delete_edge(4, 3)
        self.undirected.delete_edge(4, 3)

        assert len(self.directed.get_all_edges()) == len(self.undirected.get_all_edges()) + 1

    def test_undirected_graph(self):
        g = UndirectedGraph()
Exemplo n.º 2
0
class TestGraph(unittest.TestCase):
    def setUp(self):
        self.undirected = UndirectedGraph()
        self.undirected.add_edge(1, 2, 2)
        self.undirected.add_edge(1, 3, 6)
        self.undirected.add_edge(2, 3, 3)
        self.undirected.add_edge(2, 4, 1)
        self.undirected.add_edge(3, 4, 1)
        self.undirected.add_edge(3, 5, 4)
        self.undirected.add_edge(4, 5, 6)

        self.directed = DirectedGraph()
        self.directed.add_edge(1, 2, 2)
        self.directed.add_edge(1, 3, 6)
        self.directed.add_edge(2, 3, 3)
        self.directed.add_edge(2, 4, 1)
        self.directed.add_edge(3, 4, 1)
        self.directed.add_edge(3, 5, 4)
        self.directed.add_edge(4, 5, 6)

    def test_get_edges(self):
        assert self.undirected.get_all_edges() == self.directed.get_all_edges()
        assert self.undirected.get_vertices() == self.directed.get_vertices()

    def test_directed_graph(self):

        assert len(self.directed.get_successive_vertices(4)) == 1

        assert len(self.undirected.get_successive_vertices(4)) == 3

        assert self.undirected.edge_exists(4, 3)
        assert not self.directed.edge_exists(4, 3)

        self.directed.delete_edge(4, 3)
        self.undirected.delete_edge(4, 3)

        assert len(self.directed.get_all_edges()) == len(
            self.undirected.get_all_edges()) + 1

    def test_undirected_graph(self):
        g = UndirectedGraph()
Exemplo n.º 3
0
def contains_cycle(graph: UndirectedGraph) -> bool:
    """
    Simple breadth first cycle detection for Undirected graphs
    """
    graph = copy.deepcopy(graph)  # type: Graph

    visited_nodes = set()

    queue = Queue()
    queue.enqueue(graph.get_vertices()[0])

    while not queue.is_empty():
        vertex = queue.dequeue()

        for neighbour in graph.get_successive_vertices(vertex):
            if neighbour in visited_nodes:
                return True
            visited_nodes.add(neighbour)
            queue.enqueue(neighbour)
            graph.delete_edge(vertex, neighbour)

    return False
Exemplo n.º 4
0
def contains_cycle(graph: UndirectedGraph) -> bool:
    """
    Simple breadth first cycle detection for Undirected graphs
    """
    graph = copy.deepcopy(graph) # type: Graph

    visited_nodes = set()

    queue = Queue()
    queue.enqueue(graph.get_vertices()[0])

    while not queue.is_empty():
        vertex = queue.dequeue()

        for neighbour in graph.get_successive_vertices(vertex):
            if neighbour in visited_nodes:
                return True
            visited_nodes.add(neighbour)
            queue.enqueue(neighbour)
            graph.delete_edge(vertex, neighbour)

    return False