private static void Dijkstra(IntersectionHeap priorityQueue)
{
Intersection current;
while (priorityQueue.Size != 0)
{
current = priorityQueue.DeleteMax();
foreach (Corridor corridor in current.corridors)
{
if (corridor.Factor * current.bestFactor > corridor.NextIntersection.bestFactor)
{
corridor.NextIntersection.bestFactor = corridor.Factor * current.bestFactor;
priorityQueue.InsertOrChange(corridor.NextIntersection);
}
}
}
}
static void Main(string[] args)
{
Dictionary <int, Intersection> intersections;
IntersectionHeap priorityQueue;
string output = "";
IntersectionComp comparer = new IntersectionComp();
Scanner input = new Scanner();
int n = input.NextInt();
int m = input.NextInt();
while (n * m != 0)
{
intersections = new Dictionary <int, Intersection>();
priorityQueue = new IntersectionHeap(comparer, m);
for (int i = 0; i < n; i++)
{
Intersection intersection = new Intersection(i);
intersections.Add(i, intersection);
}
for (int i = 0; i < m; i++)
{
int interKey1 = input.NextInt();
int interKey2 = input.NextInt();
float factor = input.NextFloat();
Intersection inter1, inter2;
intersections.TryGetValue(interKey1, out inter1);
intersections.TryGetValue(interKey2, out inter2);
inter1.AddCorridor(inter2, factor);
inter2.AddCorridor(inter1, factor);
}
Intersection start;
intersections.TryGetValue(0, out start);
start.bestFactor = 1f;
priorityQueue.InsertOrChange(start);
Dijkstra(priorityQueue);
Intersection end;
intersections.TryGetValue(n - 1, out end);
output = output + end.bestFactor.ToString("0.0000") + "\n";
n = input.NextInt();
m = input.NextInt();
}
Console.Write(output);
Console.Read();
}