static void Main(string[] args)
{
Stopwatch stopWatch = new Stopwatch();
var exampleNetworkPath = Directory.GetCurrentDirectory() + "/" + TEST_EXAMPLES_DIRECTOR;
var filesPath = Directory.GetFiles(exampleNetworkPath);
foreach (string filePath in filesPath)
{
List <string> fileLines = TextFile.ReadFileLines(filePath);
FlowGraph flowGraph = new FlowGraph(fileLines);
stopWatch.Start();
var maxFlow = flowGraph.FordFulkerson();
stopWatch.Stop();
TimeSpan ts = stopWatch.Elapsed;
var elapsedTime = (decimal)ts.Ticks * 100 / frequency;
Console.WriteLine($"{maxFlow}; " + elapsedTime.ToString("F10"));
stopWatch.Restart();
}
Console.ReadLine();
}
/// <summary>
/// Lädt den Graphen aus der gegebenen Datei und führt auf diesem den FordFulkerson Algorithmus aus.
/// <paramref name="fileName">Der Name der Datei welche den Graphen enthält.</paramref>
/// </summary>
public static void CallFordFulkerson(string fileName)
{
// Den Graphen aus der Datei laden.
FlowGraph <string> graph = (FlowGraph <string>)ApplicationHelper.LoadGraph(fileName);
// Ford-Fulkerson ausführen.
FlowGraph <string> result = graph.FordFulkerson();
// Das Ergebnis in eine Datei schreiben.
string baseFileName = fileName.Split('.')[0];
ApplicationHelper.WriteResult(baseFileName, "fordfulkersonResult_", "", result.Edges.Select((edge) => edge.ToString()));
}
public void FordFulkerson_must_work()
{
// Quelle und Senke erstellen.
Vertex <string> source = new Vertex <string>("s");
Vertex <string> target = new Vertex <string>("t");
// alle weiteren Knoten des Graphens erstellen.
Vertex <string> vA = new Vertex <string>("a");
Vertex <string> vB = new Vertex <string>("b");
Vertex <string> vC = new Vertex <string>("c");
Vertex <string> vD = new Vertex <string>("d");
// Den Graphen erstellen.
FlowGraph <string> flowGraph = new FlowGraph <string>(source, target, new List <Vertex <string> >()
{
source, vA, vB, vC, vD, target
});
// Die Kanten des Graphens erstellen.
flowGraph.AddEdge("s", "a", capacity: 5, flow: 5);
flowGraph.AddEdge("s", "b", capacity: 7, flow: 3);
flowGraph.AddEdge("a", "b", capacity: 7, flow: 3);
flowGraph.AddEdge("a", "c", capacity: 4, flow: 2);
flowGraph.AddEdge("b", "c", capacity: 3, flow: 3);
flowGraph.AddEdge("b", "d", capacity: 3, flow: 3);
flowGraph.AddEdge("c", "d", capacity: 4, flow: 0);
flowGraph.AddEdge("c", "t", capacity: 5, flow: 5);
flowGraph.AddEdge("d", "t", capacity: 6, flow: 3);
FlowGraph <string> maxFlowGraph = flowGraph.FordFulkerson();
// Die Flüsse über die Kanten überprüfen.
Assert.AreEqual(5, maxFlowGraph.Edges[0].Flow);
Assert.AreEqual(5, maxFlowGraph.Edges[1].Flow);
Assert.AreEqual(1, maxFlowGraph.Edges[2].Flow);
Assert.AreEqual(4, maxFlowGraph.Edges[3].Flow);
Assert.AreEqual(3, maxFlowGraph.Edges[4].Flow);
Assert.AreEqual(3, maxFlowGraph.Edges[5].Flow);
Assert.AreEqual(2, maxFlowGraph.Edges[6].Flow);
Assert.AreEqual(5, maxFlowGraph.Edges[7].Flow);
Assert.AreEqual(5, maxFlowGraph.Edges[8].Flow);
// Die Kantenflüsse für den nächsten Test auf 0 setzen.
flowGraph.Edges.ForEach(e =>
{
e.Flow = 0;
});
maxFlowGraph = flowGraph.FordFulkerson();
// Die Flüsse über die Kanten überprüfen.
Assert.AreEqual(4, maxFlowGraph.Edges[0].Flow);
Assert.AreEqual(6, maxFlowGraph.Edges[1].Flow);
Assert.AreEqual(0, maxFlowGraph.Edges[2].Flow);
Assert.AreEqual(4, maxFlowGraph.Edges[3].Flow);
Assert.AreEqual(3, maxFlowGraph.Edges[4].Flow);
Assert.AreEqual(3, maxFlowGraph.Edges[5].Flow);
Assert.AreEqual(2, maxFlowGraph.Edges[6].Flow);
Assert.AreEqual(5, maxFlowGraph.Edges[7].Flow);
Assert.AreEqual(5, maxFlowGraph.Edges[8].Flow);
}
