internal Edge[] GetRuralChinesePostmanTour()
{
// Win.HiPerfTimer pt = new Win.HiPerfTimer(); // create a new PerfTimer object
//pt.Start();
if (this.MustEdges == null)
{
return(null);
}
if (theTour != null)
{
return(theTour);
}
int [,] dist = new int[neg.Length, pos.Length];
//dist[i,j] will be the distance from neg[i] to pos[j]
int maxdist = 0;
calcDistances(dist, ref maxdist);
//construct the weight matrix for matching
int [,] w = new int[neg.Length, pos.Length];
for (int i = 0; i < neg.Length; i++)
{
for (int j = 0; j < pos.Length; j++)
{
w[i, j] = maxdist - dist[i, j];
}
}
WeightedCompleteBipartiteMatching wb = new WeightedCompleteBipartiteMatching(w, flatNeg, flatPos);
wb.stages();
//now the matching is calculated and we can create a balanced graph
//for(int i=0;i<D;i++)
// f[neg[wm.M[i]],pos[i]]++;
//create an array of links for a balanced graph
Edge[] links = new Edge[mustEdges.Length + D];
mustEdges.CopyTo(links, D);
for (int i = 0; i < D; i++)
{
int negi = neg[flatNeg[wb.M[i]]];
int posi = pos[flatPos[i]];
links[i] = new Edge(negi, posi, adjoinedPathLabel); //don't care about weight
}
EulerianTour et = new EulerianTour(initialVertex, links, n);
Edge[] etour = et.GetTour();
ArrayList al = new ArrayList();
//Expands adjoined path paths
//Also calculates the maximal length adjoined path leading to the initial node:
//will throw this path away in the GetRuralChinesePostmanPath()
int maxIndexOfInitialVertexInAdjoinedPaths = -1;
int pathToCut = 0;
foreach (Edge l in etour)
{
if (l.label != adjoinedPathLabel)
{
al.Add(l);
}
else
{
int pathLen = dist[nodeToNeg[l.source], nodeToPos[l.target]];
SingleSourceSingleTargetUpperDistSP dm =
new SingleSourceSingleTargetUpperDistSP(this, l.source, l.target, pathLen);
Edge [] path = dm.GetPath();
al.AddRange(path);
int indexOfInitVertex = IndexOfVertexInPath(path, initialVertex);
if (indexOfInitVertex > maxIndexOfInitialVertexInAdjoinedPaths)
{
maxIndexOfInitialVertexInAdjoinedPaths = indexOfInitVertex;
pathStart = al.Count - path.Length + indexOfInitVertex;
pathToCut = indexOfInitVertex;
}
}
}
theTour = new Edge[al.Count];
al.CopyTo(theTour);
if (pathStart != Graph.NONE)
{
this.pathLength = theTour.Length - pathToCut;
}
//pt.Stop();
//System.Windows.Forms.MessageBox.Show(pt.Duration.ToString());
return(theTour);
}
internal Edge[] GetRuralChinesePostmanTour()
{
// Win.HiPerfTimer pt = new Win.HiPerfTimer(); // create a new PerfTimer object
//pt.Start();
if(this.MustEdges==null)
{
return null;
}
if(theTour != null)
return theTour;
int [,]dist=new int[neg.Length,pos.Length];
//dist[i,j] will be the distance from neg[i] to pos[j]
int maxdist=0;
calcDistances(dist,ref maxdist);
//construct the weight matrix for matching
int [,]w=new int[neg.Length,pos.Length];
for(int i=0;i<neg.Length;i++)
for(int j=0;j<pos.Length;j++)
w[i,j]=maxdist-dist[i,j];
WeightedCompleteBipartiteMatching wb=new WeightedCompleteBipartiteMatching(w,flatNeg,flatPos);
wb.stages();
//now the matching is calculated and we can create a balanced graph
//for(int i=0;i<D;i++)
// f[neg[wm.M[i]],pos[i]]++;
//create an array of links for a balanced graph
Edge[] links=new Edge[ mustEdges.Length+D];
mustEdges.CopyTo(links,D);
for(int i=0;i<D;i++)
{
int negi=neg[flatNeg[wb.M[i]]];
int posi=pos[flatPos[i]];
links[i]=new Edge(negi,posi,adjoinedPathLabel); //don't care about weight
}
EulerianTour et=new EulerianTour(initialVertex,links,n);
Edge[] etour=et.GetTour();
ArrayList al=new ArrayList();
//Expands adjoined path paths
//Also calculates the maximal length adjoined path leading to the initial node:
//will throw this path away in the GetRuralChinesePostmanPath()
int maxIndexOfInitialVertexInAdjoinedPaths=-1;
int pathToCut=0;
foreach(Edge l in etour)
{
if(l.label!=adjoinedPathLabel)
al.Add(l);
else {
int pathLen=dist[nodeToNeg[l.source],nodeToPos[l.target]];
SingleSourceSingleTargetUpperDistSP dm=
new SingleSourceSingleTargetUpperDistSP(this,l.source,l.target,pathLen);
Edge []path=dm.GetPath();
al.AddRange(path);
int indexOfInitVertex=IndexOfVertexInPath(path,initialVertex);
if(indexOfInitVertex>maxIndexOfInitialVertexInAdjoinedPaths)
{
maxIndexOfInitialVertexInAdjoinedPaths=indexOfInitVertex;
pathStart=al.Count-path.Length+indexOfInitVertex;
pathToCut=indexOfInitVertex;
}
}
}
theTour=new Edge[al.Count];
al.CopyTo(theTour);
if(pathStart!=Graph.NONE)
this.pathLength=theTour.Length-pathToCut;
//pt.Stop();
//System.Windows.Forms.MessageBox.Show(pt.Duration.ToString());
return theTour;
}
