private void FindNegtiveCycle()
{
int V = edgeTo.Length;//图的节点数量
DirectedWeightedGraph spt = new DirectedWeightedGraph(V);
for (int v = 0; v < V; ++v)
{
if (edgeTo[v] != null)
{
spt.AddEdge(edgeTo[v]);
}
}
DirectedCycle cf = new DirectedCycle(spt);
//需要转换形式
Queue <DirectedEdge> edges = new Queue <DirectedEdge>();//没有还
var list = cf.Cycle().ToList();
if (list.Count == 0)
{
return;
}
for (int i = 0; i < list.Count - 1; ++i)
{
edges.Enqueue(new DirectedEdge(list[i], list[i + 1], spt.GetWeight(list[i], list[i + 1])));
}
cycle = edges;
}
public void CycleTest()
{
using (StreamReader sr = new StreamReader(@"E:\Study\ALG2017\ALGRKC\dataSelf\tinyDG.txt"))
{
Digraph dg = new Digraph(sr);
DirectedCycle dcycle = new DirectedCycle(dg);
Assert.AreEqual(dcycle.HasCycle(), true);
IEnumerable <int> cycle = dcycle.Cycle();
foreach (int i in cycle)
{
Console.Write(i + " -> ");
}
Console.WriteLine();
}
}
void DigraphTest()
{
//var strArr = FileHandler.ReadFileAsStrArr("tinyG.txt");
//var strArr = FileHandler.ReadFileAsStrArr("tinyDG.txt");
var strArr = FileHandler.ReadFileAsStrArr("tinyDAG.txt");
var intArr = Array.ConvertAll(strArr, s => int.Parse(s));
var dg = new Digraph(intArr);
//var dgr = dg.Reverse();
var dc = new DirectedCycle(dg);
if (dc.HasCycle())
{
foreach (var v in dc.Cycle())
{
Console.WriteLine(v);
}
}
Console.ReadKey();
}
void Start()
{
Digraph G = new Digraph(txt);
DirectedCycle finder = new DirectedCycle(G);
if (finder.hasCycle())
{
string str = "Directed cycle: ";
foreach (int v in finder.Cycle())
{
str += (v + " ");
}
print(str);
}
else
{
print("No directed cycle");
}
}
public void Run()
{
Console.WriteLine("Choose file:"); // Prompt
Console.WriteLine("1 - tinyDG.txt"); // Prompt
Console.WriteLine("2 - tinyDAG.txt"); // Prompt
//Console.WriteLine("3 - largeG.zip"); // Prompt
Console.WriteLine("or quit"); // Prompt
var fileNumber = Console.ReadLine();
var fieName = string.Empty;
switch (fileNumber)
{
case "1":
fieName = "tinyDG.txt";
break;
case "2":
fieName = "tinyDAG.txt";
break;
//case "3":
// fieName = "largeG.zip";
// break;
case "quit":
return;
default:
return;
}
var @in = new In($"Files\\Graphs\\{fieName}");
var lines = !fieName.EndsWith("zip") ? @in.ReadAllLines() : @in.ReadAllLinesFromZip();
var lineIterator = 0;
var v = 0;
var e = 0;
var edges = new List <EdgeD>();
foreach (var line in lines)
{
if (lineIterator == 0)
{
v = Convert.ToInt32(line);
}
if (lineIterator == 1)
{
e = Convert.ToInt32(line);
}
if (lineIterator > 1)
{
var lineSplitted = line.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
var ve = Convert.ToInt32(lineSplitted[0]);
var we = Convert.ToInt32(lineSplitted[1]);
var edge = new EdgeD(ve, we);
edges.Add(edge);
}
lineIterator++;
}
var graph = new Digraph(v, e, edges);
if (fileNumber != "3")
{
Console.WriteLine(graph);
}
var finder = new DirectedCycle(graph);
if (finder.HasCycle())
{
Console.Write("Directed cycle: ");
foreach (int vi in finder.Cycle())
{
Console.Write($"{vi} ");
}
Console.WriteLine();
}
else
{
Console.WriteLine("No directed cycle");
}
Console.ReadLine();
}
