private static void Main()
{
Console.WriteLine("Kahn topological sort test: ");
IGraph <string> stringGraph = new Graph <string>();
var undershorts = stringGraph.AddVertex("undershorts");
var pants = stringGraph.AddVertex("pants");
var belt = stringGraph.AddVertex("belt");
var jacket = stringGraph.AddVertex("jacket");
var tie = stringGraph.AddVertex("tie");
var shirt = stringGraph.AddVertex("shirt");
var shoes = stringGraph.AddVertex("shoes");
var socks = stringGraph.AddVertex("socks");
stringGraph.AddVertex("watch");
stringGraph.AddEdge(undershorts, pants);
stringGraph.AddEdge(undershorts, shoes);
stringGraph.AddEdge(pants, belt);
stringGraph.AddEdge(pants, shoes);
stringGraph.AddEdge(belt, jacket);
stringGraph.AddEdge(tie, jacket);
stringGraph.AddEdge(shirt, tie);
stringGraph.AddEdge(shirt, belt);
stringGraph.AddEdge(socks, shoes);
var topologicalSort = KahnGraphSort <string> .KahnSort(stringGraph);
foreach (var vertex in topologicalSort)
{
Console.WriteLine(vertex);
}
}
public void KahnAlgorithmTest()
{
// example from lecture notes
IGraph <string> stringGraph = new Graph <string>();
var undershorts = stringGraph.AddVertex("undershorts");
var pants = stringGraph.AddVertex("pants");
var belt = stringGraph.AddVertex("belt");
var jacket = stringGraph.AddVertex("jacket");
var tie = stringGraph.AddVertex("tie");
var shirt = stringGraph.AddVertex("shirt");
var shoes = stringGraph.AddVertex("shoes");
var socks = stringGraph.AddVertex("socks");
var watch = stringGraph.AddVertex("watch");
stringGraph.AddEdge(undershorts, pants);
stringGraph.AddEdge(undershorts, shoes);
stringGraph.AddEdge(pants, belt);
stringGraph.AddEdge(pants, shoes);
stringGraph.AddEdge(belt, jacket);
stringGraph.AddEdge(tie, jacket);
stringGraph.AddEdge(shirt, tie);
stringGraph.AddEdge(shirt, belt);
stringGraph.AddEdge(socks, shoes);
stringGraph.IsAcyclic().Should().BeTrue();
var topologicalSort = KahnGraphSort <string> .KahnSort(stringGraph);
var kahnSortArray = topologicalSort as IVertex <string>[] ?? topologicalSort.ToArray();
kahnSortArray[0].Data.Should().Be("undershorts");
kahnSortArray[1].Data.Should().Be("shirt");
kahnSortArray[2].Data.Should().Be("socks");
kahnSortArray[3].Data.Should().Be("watch");
kahnSortArray[4].Data.Should().Be("pants");
kahnSortArray[5].Data.Should().Be("tie");
kahnSortArray[6].Data.Should().Be("belt");
kahnSortArray[7].Data.Should().Be("shoes");
kahnSortArray[8].Data.Should().Be("jacket");
stringGraph.IsEmpty.Should().BeTrue();
}
