public void TopologicalSortOnWeightedGraph()
{
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
// 2 -> 5
// 2 <- 3, 6
// 3 -> 2, 6
// 3 <- 1, 4
// 4 -> 3, 6, 7
// 4 <- 1
// 5 -> 7, 8
// 5 <- 2, 8
// 6 -> 2
// 6 <- 3, 4
// 7 -> 4
// 7 <- 5, 8
// 8 -> 7
// 8 <- 5
// 9 ->
// 9 <-
// Edges weight is the sum of the vertices
graph.AddEdge(1, 3, 4);
graph.AddEdge(1, 4, 5);
graph.AddEdge(2, 5, 7);
graph.AddEdge(3, 2, 5);
graph.AddEdge(3, 6, 9);
graph.AddEdge(4, 3, 7);
graph.AddEdge(4, 6, 10);
graph.AddEdge(4, 7, 11);
graph.AddEdge(5, 7, 12);
graph.AddEdge(5, 8, 13);
graph.AddEdge(6, 2, 8);
graph.AddEdge(8, 7, 15);
// Expected topological sort
// 1 4 3 6 2 5 8 7 9
var expected = new int[] { 1, 4, 3, 6, 2, 5, 8, 7, 9 };
var topSort = graph.TopologicalSortSmallestFirst();
for (int i = 0; i < expected.Length; i++)
{
Assert.IsTrue(topSort[i] == expected[i]);
}
}
public void UpdatingAndGettingEdgeWeight()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedWeightedALGraph <int, int>();
graph.AddVertices(vertices);
Assert.IsTrue(graph.VerticesCount == vertices.Length);
foreach (var vertex in vertices)
{
Assert.IsTrue(graph.ContainsVertex(vertex));
}
// 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);
int weight = 0;
Assert.IsTrue(graph.TryGetEdgeWeight(1, 3, out weight));
Assert.IsTrue(weight == -2);
Assert.IsTrue(graph.UpdateEdgeWeight(1, 3, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(1, 3, out weight));
Assert.IsTrue(weight == -4);
Assert.IsTrue(graph.TryGetEdgeWeight(1, 4, out weight));
Assert.IsTrue(weight == -3);
Assert.IsTrue(graph.UpdateEdgeWeight(1, 4, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(1, 4, out weight));
Assert.IsTrue(weight == -6);
Assert.IsTrue(graph.TryGetEdgeWeight(2, 1, out weight));
Assert.IsTrue(weight == 1);
Assert.IsTrue(graph.UpdateEdgeWeight(2, 1, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(2, 1, out weight));
Assert.IsTrue(weight == 2);
Assert.IsTrue(graph.TryGetEdgeWeight(2, 5, out weight));
Assert.IsTrue(weight == -3);
Assert.IsTrue(graph.UpdateEdgeWeight(2, 5, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(2, 5, out weight));
Assert.IsTrue(weight == -6);
Assert.IsTrue(graph.TryGetEdgeWeight(3, 2, out weight));
Assert.IsTrue(weight == 1);
Assert.IsTrue(graph.UpdateEdgeWeight(3, 2, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(3, 2, out weight));
Assert.IsTrue(weight == 2);
Assert.IsTrue(graph.TryGetEdgeWeight(3, 6, out weight));
Assert.IsTrue(weight == -3);
Assert.IsTrue(graph.UpdateEdgeWeight(3, 6, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(3, 6, out weight));
Assert.IsTrue(weight == -6);
Assert.IsTrue(graph.TryGetEdgeWeight(4, 3, out weight));
Assert.IsTrue(weight == 1);
Assert.IsTrue(graph.UpdateEdgeWeight(4, 3, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(4, 3, out weight));
Assert.IsTrue(weight == 2);
Assert.IsTrue(graph.TryGetEdgeWeight(4, 6, out weight));
Assert.IsTrue(weight == -2);
Assert.IsTrue(graph.UpdateEdgeWeight(4, 6, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(4, 6, out weight));
Assert.IsTrue(weight == -4);
Assert.IsTrue(graph.TryGetEdgeWeight(5, 2, out weight));
Assert.IsTrue(weight == 3);
Assert.IsTrue(graph.UpdateEdgeWeight(5, 2, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(5, 2, out weight));
Assert.IsTrue(weight == 6);
Assert.IsTrue(graph.TryGetEdgeWeight(5, 7, out weight));
Assert.IsTrue(weight == -2);
Assert.IsTrue(graph.UpdateEdgeWeight(5, 7, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(5, 7, out weight));
Assert.IsTrue(weight == -4);
Assert.IsTrue(graph.TryGetEdgeWeight(5, 8, out weight));
Assert.IsTrue(weight == -3);
Assert.IsTrue(graph.UpdateEdgeWeight(5, 8, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(5, 8, out weight));
Assert.IsTrue(weight == -6);
Assert.IsTrue(graph.TryGetEdgeWeight(6, 2, out weight));
Assert.IsTrue(weight == 4);
Assert.IsTrue(graph.UpdateEdgeWeight(6, 2, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(6, 2, out weight));
Assert.IsTrue(weight == 8);
Assert.IsTrue(graph.TryGetEdgeWeight(7, 4, out weight));
Assert.IsTrue(weight == 3);
Assert.IsTrue(graph.UpdateEdgeWeight(7, 4, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(7, 4, out weight));
Assert.IsTrue(weight == 6);
Assert.IsTrue(graph.TryGetEdgeWeight(8, 5, out weight));
Assert.IsTrue(weight == 3);
Assert.IsTrue(graph.UpdateEdgeWeight(8, 5, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(8, 5, out weight));
Assert.IsTrue(weight == 6);
Assert.IsTrue(graph.TryGetEdgeWeight(8, 7, out weight));
Assert.IsTrue(weight == 1);
Assert.IsTrue(graph.UpdateEdgeWeight(8, 7, weight * 2));
Assert.IsTrue(graph.TryGetEdgeWeight(8, 7, out weight));
Assert.IsTrue(weight == 2);
}
public void CheckIfDFSIsCorrect()
{
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);
// Expected dfs for vertex 1:
// 1 | 3 | 2 | 5 | 7 | 4 | 6 | 8
var dfsExpectedOutput = new int[] { 1, 3, 2, 5, 7, 4, 6, 8 };
var dfs = graph.DepthFirstSearch(1).ToList();
Assert.IsTrue(dfs.Count == dfsExpectedOutput.Length);
for (int i = 0; i < dfs.Count; i++)
{
Assert.IsTrue(dfs[i] == dfsExpectedOutput[i]);
}
// Expected dfs edges for vertex 1:
// 1 | 3 | 2 | 5 | 7 | 4 | 5
// 3 | 2 | 5 | 7 | 4 | 6 | 8
var dfsExpectedSources = new int[] { 1, 3, 2, 5, 7, 4, 5 };
var dfsExpectedDestinations = new int[] { 3, 2, 5, 7, 4, 6, 8 };
var dfsEdges = graph.DepthFirstSearchEdges(1).ToList();
Assert.IsTrue(dfsEdges.Count == dfsExpectedSources.Length);
for (int i = 0; i < dfsEdges.Count; i++)
{
Assert.IsTrue(dfsEdges[i].Source == dfsExpectedSources[i]);
Assert.IsTrue(dfsEdges[i].Destination == dfsExpectedDestinations[i]);
Assert.IsTrue(dfsEdges[i].Weight == dfsEdges[i].Source - dfsEdges[i].Destination);
}
// Expected dfs for vertex 8:
// 8 | 5 | 2 | 1 | 3 | 6 | 4 | 7
dfsExpectedOutput = new int[] { 8, 5, 2, 1, 3, 6, 4, 7 };
dfs = graph.DepthFirstSearch(8).ToList();
Assert.IsTrue(dfs.Count == dfsExpectedOutput.Length);
for (int i = 0; i < dfs.Count; i++)
{
Assert.IsTrue(dfs[i] == dfsExpectedOutput[i]);
}
// Expected dfs edges for vertex 8:
// 8 | 5 | 2 | 1 | 3 | 1 | 5
// 5 | 2 | 1 | 3 | 6 | 4 | 7
dfsExpectedSources = new int[] { 8, 5, 2, 1, 3, 1, 5 };
dfsExpectedDestinations = new int[] { 5, 2, 1, 3, 6, 4, 7 };
dfsEdges = graph.DepthFirstSearchEdges(8).ToList();
Assert.IsTrue(dfsEdges.Count == dfsExpectedSources.Length);
for (int i = 0; i < dfsEdges.Count; i++)
{
Assert.IsTrue(dfsEdges[i].Source == dfsExpectedSources[i]);
Assert.IsTrue(dfsEdges[i].Destination == dfsExpectedDestinations[i]);
Assert.IsTrue(dfsEdges[i].Weight == dfsEdges[i].Source - dfsEdges[i].Destination);
}
}
public void CheckIfOutgoingEdgesAreCorrect()
{
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);
// Vertex 1 expected outgoing edges: 3 4
var expected = new int[] { 3, 4 };
var edges = graph.OutgoingEdgesSorted(1).ToList();
Assert.IsTrue(edges.Count == expected.Length);
for (int i = 0; i < expected.Length; i++)
{
Assert.IsTrue(edges[i].Destination == expected[i]);
Assert.IsTrue(edges[i].Weight == edges[i].Source - edges[i].Destination);
}
// Vertex 5 expected outgoing edges: 2 7 8
expected = new int[] { 2, 7, 8 };
edges = graph.OutgoingEdgesSorted(5).ToList();
Assert.IsTrue(edges.Count == expected.Length);
for (int i = 0; i < expected.Length; i++)
{
Assert.IsTrue(edges[i].Destination == expected[i]);
Assert.IsTrue(edges[i].Weight == edges[i].Source - edges[i].Destination);
}
// Vertex 7 expected outgoing edges: 4
expected = new int[] { 4 };
edges = graph.OutgoingEdgesSorted(7).ToList();
Assert.IsTrue(edges.Count == expected.Length);
for (int i = 0; i < expected.Length; i++)
{
Assert.IsTrue(edges[i].Destination == expected[i]);
Assert.IsTrue(edges[i].Weight == edges[i].Source - edges[i].Destination);
}
}
public void RemovingVerticesAndCheckingIfRemovedProperly()
{
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.ContainsVertex(3));
Assert.IsTrue(graph.ContainsEdge(3, 2));
Assert.IsTrue(graph.ContainsEdge(3, 6));
Assert.IsTrue(graph.ContainsEdge(1, 3));
Assert.IsTrue(graph.ContainsEdge(4, 3));
graph.RemoveVertex(3);
Assert.IsFalse(graph.ContainsVertex(3));
Assert.IsFalse(graph.ContainsEdge(3, 2));
Assert.IsFalse(graph.ContainsEdge(3, 6));
Assert.IsFalse(graph.ContainsEdge(1, 3));
Assert.IsFalse(graph.ContainsEdge(4, 3));
Assert.IsTrue(graph.EdgesCount == 11);
Assert.IsTrue(graph.ContainsVertex(5));
Assert.IsTrue(graph.ContainsEdge(5, 2));
Assert.IsTrue(graph.ContainsEdge(5, 7));
Assert.IsTrue(graph.ContainsEdge(5, 8));
Assert.IsTrue(graph.ContainsEdge(2, 5));
Assert.IsTrue(graph.ContainsEdge(8, 5));
graph.RemoveVertex(5);
Assert.IsFalse(graph.ContainsVertex(5));
Assert.IsFalse(graph.ContainsEdge(5, 2));
Assert.IsFalse(graph.ContainsEdge(5, 7));
Assert.IsFalse(graph.ContainsEdge(5, 8));
Assert.IsFalse(graph.ContainsEdge(2, 5));
Assert.IsFalse(graph.ContainsEdge(8, 5));
Assert.IsTrue(graph.EdgesCount == 6);
}
public void CheckingIfVerticesAndEdgesAreAddedProperly()
{
var vertices = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
var graph = new DirectedWeightedALGraph <int, int>();
graph.AddVertices(vertices);
Assert.IsTrue(graph.VerticesCount == vertices.Length);
foreach (var vertex in vertices)
{
Assert.IsTrue(graph.ContainsVertex(vertex));
}
// 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);
int weight = 0;
Assert.IsTrue(graph.TryGetEdgeWeight(1, 3, out weight));
Assert.IsTrue(weight == -2);
Assert.IsTrue(graph.TryGetEdgeWeight(1, 4, out weight));
Assert.IsTrue(weight == -3);
Assert.IsTrue(graph.TryGetEdgeWeight(2, 1, out weight));
Assert.IsTrue(weight == 1);
Assert.IsTrue(graph.TryGetEdgeWeight(2, 5, out weight));
Assert.IsTrue(weight == -3);
Assert.IsTrue(graph.TryGetEdgeWeight(3, 2, out weight));
Assert.IsTrue(weight == 1);
Assert.IsTrue(graph.TryGetEdgeWeight(3, 6, out weight));
Assert.IsTrue(weight == -3);
Assert.IsTrue(graph.TryGetEdgeWeight(4, 3, out weight));
Assert.IsTrue(weight == 1);
Assert.IsTrue(graph.TryGetEdgeWeight(4, 6, out weight));
Assert.IsTrue(weight == -2);
Assert.IsTrue(graph.TryGetEdgeWeight(5, 2, out weight));
Assert.IsTrue(weight == 3);
Assert.IsTrue(graph.TryGetEdgeWeight(5, 7, out weight));
Assert.IsTrue(weight == -2);
Assert.IsTrue(graph.TryGetEdgeWeight(5, 8, out weight));
Assert.IsTrue(weight == -3);
Assert.IsTrue(graph.TryGetEdgeWeight(6, 2, out weight));
Assert.IsTrue(weight == 4);
Assert.IsTrue(graph.TryGetEdgeWeight(7, 4, out weight));
Assert.IsTrue(weight == 3);
Assert.IsTrue(graph.TryGetEdgeWeight(8, 5, out weight));
Assert.IsTrue(weight == 3);
Assert.IsTrue(graph.TryGetEdgeWeight(8, 7, out weight));
Assert.IsTrue(weight == 1);
Assert.IsFalse(graph.ContainsEdge(1, 2));
Assert.IsFalse(graph.ContainsEdge(1, 5));
Assert.IsFalse(graph.ContainsEdge(1, 6));
Assert.IsFalse(graph.ContainsEdge(1, 7));
Assert.IsFalse(graph.ContainsEdge(1, 8));
Assert.IsFalse(graph.ContainsEdge(2, 3));
Assert.IsFalse(graph.ContainsEdge(2, 4));
Assert.IsFalse(graph.ContainsEdge(2, 6));
Assert.IsFalse(graph.ContainsEdge(2, 7));
Assert.IsFalse(graph.ContainsEdge(2, 8));
Assert.IsFalse(graph.ContainsEdge(3, 1));
Assert.IsFalse(graph.ContainsEdge(3, 4));
Assert.IsFalse(graph.ContainsEdge(3, 5));
Assert.IsFalse(graph.ContainsEdge(3, 7));
Assert.IsFalse(graph.ContainsEdge(3, 8));
Assert.IsFalse(graph.ContainsEdge(4, 1));
Assert.IsFalse(graph.ContainsEdge(4, 2));
Assert.IsFalse(graph.ContainsEdge(4, 5));
Assert.IsFalse(graph.ContainsEdge(4, 7));
Assert.IsFalse(graph.ContainsEdge(4, 8));
Assert.IsFalse(graph.ContainsEdge(5, 1));
Assert.IsFalse(graph.ContainsEdge(5, 3));
Assert.IsFalse(graph.ContainsEdge(5, 4));
Assert.IsFalse(graph.ContainsEdge(5, 6));
Assert.IsFalse(graph.ContainsEdge(6, 1));
Assert.IsFalse(graph.ContainsEdge(6, 3));
Assert.IsFalse(graph.ContainsEdge(6, 4));
Assert.IsFalse(graph.ContainsEdge(6, 5));
Assert.IsFalse(graph.ContainsEdge(6, 7));
Assert.IsFalse(graph.ContainsEdge(6, 8));
Assert.IsFalse(graph.ContainsEdge(7, 1));
Assert.IsFalse(graph.ContainsEdge(7, 2));
Assert.IsFalse(graph.ContainsEdge(7, 3));
Assert.IsFalse(graph.ContainsEdge(7, 5));
Assert.IsFalse(graph.ContainsEdge(7, 6));
Assert.IsFalse(graph.ContainsEdge(7, 8));
Assert.IsFalse(graph.ContainsEdge(8, 1));
Assert.IsFalse(graph.ContainsEdge(8, 2));
Assert.IsFalse(graph.ContainsEdge(8, 3));
Assert.IsFalse(graph.ContainsEdge(8, 4));
Assert.IsFalse(graph.ContainsEdge(8, 6));
}
public void DirectedAndWeightedGraphShortestPathsCheck()
{
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 absolute value of the difference of the vertices
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);
// Expected shortest paths for vertex 1
// 1 to 2 : 1 -> 3 -> 2
// 1 to 3 : 1 -> 3
// 1 to 4 : 1 -> 4
// 1 to 5 : 1 -> 3 -> 2 -> 5
// 1 to 6 : 1 -> 3 -> 6
// 1 to 7 : 1 -> 3 -> 2 -> 5 -> 7
// 1 to 8 : 1 -> 3 -> 2 -> 5 -> 8
// 1 to 9 : no path
var expectedPaths = new int[7][]
{
new int[] { 1, 3, 2 },
new int[] { 1, 3 },
new int[] { 1, 4 },
new int[] { 1, 3, 2, 5 },
new int[] { 1, 3, 6 },
new int[] { 1, 3, 2, 5, 7 },
new int[] { 1, 3, 2, 5, 8 }
};
var expectedEdgesWeights = new int[7][]
{
new int[] { 2, 1 },
new int[] { 2 },
new int[] { 3 },
new int[] { 2, 1, 3 },
new int[] { 2, 3 },
new int[] { 2, 1, 3, 2 },
new int[] { 2, 1, 3, 3 }
};
var paths = graph.DijkstraShortestPaths(1);
for (int i = 0; i < 7; i++)
{
var curPath = paths.VerticesPathTo(i + 2);
for (int j = 0; j < curPath.Count; j++)
{
if (expectedPaths[i][j] != curPath[j])
{
Assert.Fail();
}
}
var curEdgesPath = paths.EdgesPathTo(i + 2);
for (int j = 0; j < curEdgesPath.Count; j++)
{
if (expectedEdgesWeights[i][j] != curEdgesPath[j].Weight)
{
Assert.Fail();
}
}
}
Assert.IsFalse(paths.HasPathTo(9));
// Expected shortest paths for vertex 8
// 8 to 1 : 8 -> 5 -> 2 -> 1
// 8 to 2 : 8 -> 5 -> 2
// 8 to 3 : 8 -> 7 -> 4 -> 3
// 8 to 4 : 8 -> 7 -> 4
// 8 to 5 : 8 -> 5
// 8 to 6 : 8 -> 7 -> 4 -> 6
// 8 to 7 : 8 -> 7
// 8 to 9 : no path
expectedPaths = new int[7][]
{
new int[] { 8, 5, 2, 1 },
new int[] { 8, 5, 2 },
new int[] { 8, 7, 4, 3 },
new int[] { 8, 7, 4 },
new int[] { 8, 5 },
new int[] { 8, 7, 4, 6 },
new int[] { 8, 7 }
};
expectedEdgesWeights = new int[7][]
{
new int[] { 3, 3, 1 },
new int[] { 3, 3 },
new int[] { 1, 3, 1 },
new int[] { 1, 3 },
new int[] { 3 },
new int[] { 1, 3, 2 },
new int[] { 1 }
};
paths = graph.DijkstraShortestPaths(8);
for (int i = 0; i < 7; i++)
{
var curPath = paths.VerticesPathTo(i + 1);
for (int j = 0; j < curPath.Count; j++)
{
if (expectedPaths[i][j] != curPath[j])
{
Assert.Fail();
}
}
var curEdgesPath = paths.EdgesPathTo(i + 1);
for (int j = 0; j < curEdgesPath.Count; j++)
{
if (expectedEdgesWeights[i][j] != curEdgesPath[j].Weight)
{
Assert.Fail();
}
}
}
Assert.IsFalse(paths.HasPathTo(9));
}
