Esempio n. 1
0
        public void RemovingEdgesAndCheckingIfRemovedProperly()
        {
            var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };

            var graph = new DirectedWeightedALGraph <int, int>();

            graph.AddVertices(vertices);

            // Graph is:
            // 1 -> 3, 4
            // 1 <- 2
            // 2 -> 1, 5
            // 2 <- 3, 5, 6
            // 3 -> 2, 6
            // 3 <- 1, 4
            // 4 -> 3, 6
            // 4 <- 1, 7
            // 5 -> 2, 7, 8
            // 5 <- 2, 8
            // 6 -> 2
            // 6 <- 3, 4
            // 7 -> 4
            // 7 <- 5, 8
            // 8 -> 5, 7
            // 8 <- 5
            // 9 ->
            // 9 <-
            // With each edge having a weight of the diffrenece between the source and destination vertex (source - destination)
            graph.AddEdge(1, 3, -2);
            graph.AddEdge(1, 4, -3);
            graph.AddEdge(2, 1, 1);
            graph.AddEdge(2, 5, -3);
            graph.AddEdge(3, 2, 1);
            graph.AddEdge(3, 6, -3);
            graph.AddEdge(4, 3, 1);
            graph.AddEdge(4, 6, -2);
            graph.AddEdge(5, 2, 3);
            graph.AddEdge(5, 7, -2);
            graph.AddEdge(5, 8, -3);
            graph.AddEdge(6, 2, 4);
            graph.AddEdge(7, 4, 3);
            graph.AddEdge(8, 5, 3);
            graph.AddEdge(8, 7, 1);

            Assert.IsTrue(graph.EdgesCount == 15);

            Assert.IsTrue(graph.Degree(3) == 4);
            Assert.IsTrue(graph.Degree(6) == 3);
            Assert.IsTrue(graph.ContainsEdge(3, 6));
            graph.RemoveEdge(3, 6);
            Assert.IsFalse(graph.ContainsEdge(3, 6));
            Assert.IsTrue(graph.Degree(3) == 3);
            Assert.IsTrue(graph.Degree(6) == 2);

            Assert.IsTrue(graph.EdgesCount == 14);

            Assert.IsTrue(graph.Degree(1) == 3);
            Assert.IsTrue(graph.Degree(4) == 4);
            Assert.IsTrue(graph.ContainsEdge(1, 4));
            graph.RemoveEdge(1, 4);
            Assert.IsFalse(graph.ContainsEdge(1, 4));
            Assert.IsTrue(graph.Degree(1) == 2);
            Assert.IsTrue(graph.Degree(4) == 3);

            Assert.IsTrue(graph.EdgesCount == 13);

            Assert.IsTrue(graph.Degree(5) == 5);
            Assert.IsTrue(graph.Degree(7) == 3);
            Assert.IsTrue(graph.ContainsEdge(5, 7));
            graph.RemoveEdge(5, 7);
            Assert.IsFalse(graph.ContainsEdge(5, 7));
            Assert.IsTrue(graph.Degree(5) == 4);
            Assert.IsTrue(graph.Degree(7) == 2);

            Assert.IsTrue(graph.EdgesCount == 12);
        }