public static double CalculateDistance(Node[] graph, long startNode, long endNode, double[] dist, bool[] isProcessed)
{
if (startNode == endNode)
{
return(0);
}
bool[] open = new bool[graph.Length];
bool[] closed = new bool[graph.Length];
int openCount = 0;
dist[startNode] = 0;
for (int i = 1; i < graph.Length; i++)
{
graph[i].Potential = CalculatePotential(graph, graph[i], graph[endNode], dist);
}
open[(int)startNode] = true;
MinHeap heap = new MinHeap(graph.Length - 1);
heap.BuildHeap(graph, (int)startNode);
openCount++;
Node temp = new Node();
while (openCount > 0)
{
temp = graph[heap.ExtractMin()];
if (temp.Key == endNode)
{
return(dist[temp.Key]);
}
open[temp.Key] = false;
openCount--;
closed[temp.Key] = true;
for (int i = 0; i < temp.Children.Count; i++)
{
if (closed[temp.Children[i].Key])
{
continue;
}
var tentative_dist = dist[temp.Key] + temp.Children[i].Weight;
if (!open[temp.Children[i].Key])
{
open[temp.Children[i].Key] = true;
openCount++;
}
else if (tentative_dist >= dist[temp.Children[i].Key])
{
continue;
}
dist[temp.Children[i].Key] = tentative_dist;
if (dist[temp.Children[i].Key] +
CalculatePotential(graph, graph[temp.Children[i].Key], graph[endNode], dist)
< graph[temp.Children[i].Key].Potential)
{
graph[temp.Children[i].Key].Potential =
dist[temp.Children[i].Key] +
CalculatePotential(graph, graph[temp.Children[i].Key], graph[endNode], dist);
heap.ChangePriority(temp.Children[i].Key, graph[temp.Children[i].Key].Potential);
}
}
}
return(-1);
}
public double Solve(long pointCount, long[][] points)
{
double cost = 0;
MinHeap edges = new MinHeap(pointCount * pointCount);
for (int i = 0; i < pointCount - 1; i++)
{
for (int j = i + 1; j < pointCount; j++)
{
edge edge = new edge();
edge.u = i;
edge.v = j;
edge.cost = Math.Pow(Math.Pow((points[i][0] - points[j][0]), 2) + Math.Pow((points[i][1] - points[j][1]), 2), 0.5);
edges.Add(edge);
}
}
List <long> sets = new List <long>();
for (int i = 0; i < pointCount; i++)
{
sets.Add(i);
}
int edgeNumber = 0;
int size = edges._size;
for (int i = 0; i < size; i++)
{
if (edgeNumber == pointCount - 1)
{
break;
}
edge edge = edges.Pop();
if (sets[edge.u] != sets[edge.v])
{
edgeNumber++;
cost += edge.cost;
long tmp = sets[edge.v];
for (int j = 0; j < pointCount; j++)
{
if (sets[j] == tmp)
{
sets[j] = sets[edge.u];
}
}
}
}
/*List<Node> graph = new List<Node>();
* List<edge> edges = new List<edge>();
*
* for (int i=0; i<pointCount; i++)
* {
* graph.Add(new Node());
* graph[i].x = points[i][0];
* graph[i].y = points[i][1];
* graph[i].set = i;
*
* }
*
*
* for (int i=0; i < pointCount-1; i++)
* {
* for (int j=i+1; j < pointCount;j++)
* {
* edge edge = new edge();
* edge.u = graph[i];
* edge.v = graph[j];
* edge.cost = Math.Pow(Math.Pow((edge.u.x - edge.v.x), 2) + Math.Pow((edge.u.y - edge.v.y), 2), 0.5);
* edges.Add(edge);
* }
* }
* for (int i=0; i < edges.Count; i++)
* {
* double min = double.MaxValue;
* int minIndex = int.MaxValue;
* for (int j=i; j < edges.Count; j++)
* {
* if (edges[j].cost < min)
* {
* minIndex = j;
* min = edges[j].cost;
* }
* }
* edge tmp = edges[i];
* edges[i] = edges[minIndex];
* edges[minIndex] = tmp;
* }
* double cost = 0;
* int edgeNumber = 0;
*
* for(int i= 0; i<edges.Count; i++)
* {
* if (edgeNumber == pointCount - 1)
* break;
* if (edges[i].u.set != edges[i].v.set)
* {
* edgeNumber++;
* edges[i].v.edges.Add(edges[i].u);
* edges[i].u.edges.Add(edges[i].v);
* cost += edges[i].cost;
* long tmp = edges[i].v.set;
* for (int j = 0; j < pointCount; j++)
* {
* if (graph[j].set == tmp)
* graph[j].set = edges[i].u.set;
* }
* }
*
* }*/
return((double)((long)(cost * 1000000 + 0.5)) / 1000000);
}
