/// <summary>
/// Dijkstra algorithm
/// </summary>
/// <param name="sourceIndex">the source index of vertex</param>
/// <param name="heap">the heap tha support priority queue</param>
/// <returns>return the array that contains the minimal length from the source to all vertex</returns>
public double[] Dijkstra(int sourceIndex, Heap <VertexNode> heap)
{
double[] result = new double[count];
for (int i = 0; i < count; i++)
{
result[i] = maxDistance;
}
result[sourceIndex] = 0;
GraphPriorityQueue queue = new GraphPriorityQueue(count, new BinaryHeap <VertexNode>(count));
VertexNode[] vertexNodeArray = new VertexNode[count];
for (int i = 0; i < count; i++)
{
vertexNodeArray[i] = new VertexNode(i, maxDistance);
}
queue.BuildHeap(vertexNodeArray);
queue.ModifyVertexNode(sourceIndex, 0);
while (queue.Count != 0)
{
VertexNode minNode = queue.ExtractMin();
if (minNode.Length == maxDistance)
{
break;
}
for (AdjEdgeNode edgeNode = nodes[minNode.Index].FirstEdge; edgeNode != null; edgeNode = edgeNode.Next)
{
if (edgeNode.Length < maxDistance)
{
double newLength = minNode.Length + edgeNode.Length;
if (newLength < result[edgeNode.Index])
{
result[edgeNode.Index] = newLength;
queue.ModifyVertexNode(edgeNode.Index, newLength);
}
}
}
}
return(result);
}
/// <summary>
/// Dijkstra algorithm
/// </summary>
/// <param name="sourceIndex">the source index of vertex</param>
/// <param name="heap">the heap tha support priority queue</param>
/// <returns>return the array that contains the minimal length from the source to all vertex</returns>
public double[] Dijkstra(int sourceIndex, Heap <VertexNode> heap)
{
double[] result = new double[count];
for (int i = 0; i < count; i++)
{
result[i] = maxDistance;
}
result[sourceIndex] = 0;
GraphPriorityQueue queue = new GraphPriorityQueue(count, heap);
VertexNode[] vertexNodeArray = new VertexNode[count];
for (int i = 0; i < count; i++)
{
vertexNodeArray[i] = new VertexNode(i, maxDistance);
}
queue.BuildHeap(vertexNodeArray);
queue.ModifyVertexNode(sourceIndex, 0);
while (queue.Count != 0)
{
VertexNode minNode = queue.ExtractMin();
if (minNode.Length == maxDistance)
{
break;
}
for (int i = 0; i < count; i++)
{
if (matrix[minNode.Index][i] < maxDistance)
{
double newLength = minNode.Length + matrix[minNode.Index][i];
if (newLength < result[i])
{
result[i] = newLength;
queue.ModifyVertexNode(i, newLength);
}
}
}
}
return(result);
}
