static void Main(string[] args)
{
DGraph graph = new DGraph();
NodeD testV1 = new NodeD("Sea");
NodeD testV2 = new NodeD("Chi");
NodeD testV3 = new NodeD("SF");
graph.AddNode(testV1);
graph.AddNode(testV2);
//graph.AddNode(testV3);
graph.AddEdge(testV1, testV2, 150);
//graph.AddEdge(testV2, testV3, 250);
string[] travel = new string[] { "Sea", "Chi" };
//List<Node> nodes = graph.GetNodes();
//foreach (var item in nodes)
//{
// Console.WriteLine(item.Value.ToString());
//}
List <DEdge> edges = graph.GetNeighbors(testV1);
foreach (DEdge item in edges)
{
Console.WriteLine(item);
}
Console.WriteLine(GetEdge(graph, travel));
}
public void DGraph_has_cycle()
{
DGraph<int> g = null;
using (var reader = File.OpenText(@"C:\rajiv\DSinCS\DataStructures\DSTests\graph1.txt"))
while (!reader.EndOfStream)
{
var V = uint.Parse(reader.ReadLine().Trim());
g = new DGraph<int>(V);
while (!reader.EndOfStream)
{
var inp = reader.ReadLine().Split(new char[] { ' ' }).Select(int.Parse).ToArray();
g.AddEdge(inp[0], inp[1]);
}
}
foreach (var e in g.BfsPathTo(0, 9))
{
Console.WriteLine($"{e} ");
}
foreach (var e in g.DfsPathTo(0, 4))
{
Console.WriteLine($"{e} ");
}
Console.WriteLine($"check cycle from a node 7 :{g.HasCycle(7)}");
Console.WriteLine($"check cycle from a node 0 :{g.HasCycle(0)}");
foreach (var e in g.DfsPathToNon(0, 4))
{
Console.WriteLine($"{e} ");
}
}
static void ConnectTest()
{
Console.Write("This test displays a connection table for a directed graph\n\n");
// create the graph
DGraph tree1 = new DGraph();
//add nodes
tree1.AddNode('A');
tree1.AddNode('C');
tree1.AddNode('T');
tree1.AddNode('Z');
tree1.AddNode('X');
tree1.AddNode('K');
tree1.AddNode('Q');
tree1.AddNode('J');
tree1.AddNode('M');
tree1.AddNode('U');
// add some edges
tree1.AddEdge('A', 'C');
tree1.AddEdge('A', 'T');
tree1.AddEdge('A', 'Z');
tree1.AddEdge('X', 'C');
tree1.AddEdge('C', 'X');
tree1.AddEdge('C', 'K');
tree1.AddEdge('T', 'Q');
tree1.AddEdge('K', 'Q');
tree1.AddEdge('Q', 'J');
tree1.AddEdge('J', 'M');
tree1.AddEdge('Z', 'X');
tree1.AddEdge('U', 'M');
tree1.AddEdge('K', 'X');
// uncomment the next line to see your node list, edge list, and edge matrix
Debug1(tree1);
Console.Write("The breadth first min tree from A should be: \n");
Console.Write(" A-Z A-Z A-T A-C Z-X T-Q C-K Q-J J-M with U unreachable\n");
Console.Write(" is: " + tree1.BreadthFirst('A') + "\n\n");
Console.Write("Note that the order of nodes in your output might differ\n");
Console.Write("what is important which nodes are reached from each start\n");
Console.Write("The graph connect table should be: \n");
Console.Write("A: Z X C K Q J M T \n");
Console.Write("C: K X Q J M\n");
Console.Write("T: Q J M\n");
Console.Write("Z: X C K Q J M\n");
Console.Write("X: C K Q J M\n");
Console.Write("K: X C Q J M\n");
Console.Write("Q: J M\n");
Console.Write("J: M\n");
Console.Write("M:\n");
Console.Write("U: M \n\n");
Console.Write("The graph connect table is: \n");
Console.Write(tree1.ConnectTable() + "\n\n");
Console.Write("End of testing connection table\n\n");
}
public void Find_shortest_path_in_graph()
{
using (var reader = File.OpenText(@"C:\rajiv\DSinCS\DataStructures\DSTests\Data\tinyEWD.txt"))
{
var V = uint.Parse(reader.ReadLine());
var g = new DGraph<int>(V);
reader.ReadLine();
while (!reader.EndOfStream)
{
var line = reader.ReadLine();
if(line == null) { continue; }
var inp = line.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
var u = int.Parse(inp[0]);
var v = int.Parse(inp[1]);
var w = float.Parse(inp[2]);
g.AddEdge(u, v, w);
}
var res = g.ShortestPathTree(0);
Assert.AreEqual(res[0], 0);
Assert.AreEqual(res[1], (float)1.05);
Assert.AreEqual(res[2], (float)0.26);
Assert.AreEqual(res[3], (float)0.99);
Assert.AreEqual(res[4], (float)0.38);
Assert.AreEqual(res[5], (float)0.73);
Assert.AreEqual(res[6], (float)1.51);
Assert.AreEqual(res[7], (float)0.6);
}
}
public void Run_topologocal_sort()
{
var g = new DGraph<int>(6);
g.AddEdge(2, 3);
g.AddEdge(3, 1);
g.AddEdge(5, 2);
g.AddEdge(4, 0);
g.AddEdge(4, 1);
g.AddEdge(5, 0);
var res = g.TopologicalSort();
var str = string.Join(",", res);
Debug.WriteLine(str);
Assert.AreEqual(str, "4,5,0,2,3,1");
}
public void Run_topological_sort_2()
{
var g = new DGraph<int>(8);
g.AddEdge(5, 11);
g.AddEdge(11, 2);
g.AddEdge(11, 9);
g.AddEdge(11, 10);
g.AddEdge(7, 11);
g.AddEdge(7, 8);
g.AddEdge(8, 9);
g.AddEdge(3, 8);
g.AddEdge(3, 10);
var res = g.TopologicalSort();
var str = string.Join(",", res);
Debug.WriteLine(str);
Assert.AreEqual(str, "3,7,8,5,11,10,9,2");
}
public void MST_via_kruskals()
{
using (var reader = File.OpenText(@"C:\rajiv\DSinCS\DataStructures\DSTests\Data\tinyEWG.txt"))
{
var V = uint.Parse(reader.ReadLine());
var g = new DGraph<int>(V);
reader.ReadLine();
while (!reader.EndOfStream)
{
var line = reader.ReadLine();
if (line == null) { continue; }
var inp = line.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
var u = int.Parse(inp[0]);
var v = int.Parse(inp[1]);
var w = float.Parse(inp[2]);
g.AddEdge(u, v, w);
}
var res = g.MST_Kruskal();
Assert.AreEqual(res.Count, 7);
}
}