void Start () {
int s = 0;
EdgeWeightedDigraph G = new EdgeWeightedDigraph(txt);
BellmanFordSP sp = new BellmanFordSP(G, s);
// print negative cycle
if (sp.hasNegativeCycle())
{
foreach (DirectedEdge e in sp.negativeCycle())
print(e);
}
// print shortest paths
else
{
for (int v = 0; v < G.V(); v++)
{
if (sp.hasPathTo(v))
{
string str=(s+" to "+ v+" Distance="+ sp.DistTo(v)+" ");
foreach (DirectedEdge e in sp.PathTo(v))
{
str+=(e + " ");
}
print(str);
}
else
{
print(s+" to "+ v+" no path\n");
}
}
}
}
/**/ public static void main(string[] strarr)
{
In i = new In(strarr[0]);
int i2 = Integer.parseInt(strarr[1]);
EdgeWeightedDigraph edgeWeightedDigraph = new EdgeWeightedDigraph(i);
BellmanFordSP bellmanFordSP = new BellmanFordSP(edgeWeightedDigraph, i2);
if (bellmanFordSP.hasNegativeCycle())
{
Iterator iterator = bellmanFordSP.negativeCycle().iterator();
while (iterator.hasNext())
{
DirectedEdge obj = (DirectedEdge)iterator.next();
StdOut.println(obj);
}
}
else
{
for (int j = 0; j < edgeWeightedDigraph.V(); j++)
{
if (bellmanFordSP.hasPathTo(j))
{
StdOut.printf("%d to %d (%5.2f) ", new object[]
{
Integer.valueOf(i2),
Integer.valueOf(j),
java.lang.Double.valueOf(bellmanFordSP.distTo(j))
});
Iterator iterator2 = bellmanFordSP.pathTo(j).iterator();
while (iterator2.hasNext())
{
DirectedEdge obj2 = (DirectedEdge)iterator2.next();
StdOut.print(new StringBuilder().append(obj2).append(" ").toString());
}
StdOut.println();
}
else
{
StdOut.printf("%d to %d no path\n", new object[]
{
Integer.valueOf(i2),
Integer.valueOf(j)
});
}
}
}
}
void Start()
{
string[] lines = txt.text.Split(new char[] { '\n' });
// V currencies
int V = int.Parse(lines[0]);
string[] name = new string[V];
// create complete network
EdgeWeightedDigraph G = new EdgeWeightedDigraph(V);
for (int v = 0; v < V; v++)
{
string[] lineStrs = lines[v + 1].Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
name[v] = lineStrs[0];
for (int w = 0; w < V; w++)
{
double rate = double.Parse(lineStrs[w + 1]);
DirectedEdge e = new DirectedEdge(v, w, -Math.Log(rate));
G.addEdge(e);
}
}
// find negative cycle
BellmanFordSP spt = new BellmanFordSP(G, 0);
if (spt.hasNegativeCycle())
{
double stake = 1000.0;
foreach (DirectedEdge e in spt.negativeCycle())
{
string str = (stake + " " + name[e.from()] + " ");
stake *= Math.Exp(-e.Weight());
str += ("= " + stake + " " + name[e.to()] + "\n");
print(str);
}
print("以1000元为本金，该负权重环一圈套利" + (stake - 1000));
}
else
{
print("No arbitrage opportunity");
}
}
