internal void GetTopologicalSort()
{
Queues.DoublyLinkedListGenericQueue <int> queue = new Queues.DoublyLinkedListGenericQueue <int>();
//bool ZeroIndegNodePresent = false;
//int indegNodeIndex = -1;
int[] indegreesForNodes = new int[adjMatrix.Length];
bool[] nodesAddedToQueue = new bool[adjMatrix.Length];
//WIP
for (int i = 0; i < adjMatrix.Length; i++)
{
int indeg = GetIndegreeOfNode(i, adjMatrix);
indegreesForNodes[i] = indeg;
if (indeg == 0)
{
queue.push(i);
nodesAddedToQueue[i] = true;
}
}
while (queue.peek() != null)
{
int NodeIndex = (int)queue.pop();
Console.Write(((char)('A' + NodeIndex)) + "\t");
//Getting neighbours of the node
for (int i = 0; i < adjMatrix[NodeIndex].Length; i++)
{
if (adjMatrix[NodeIndex][i] > 0)
{
indegreesForNodes[i]--;
if (indegreesForNodes[i] == 0 && !nodesAddedToQueue[i])
{
queue.push(i);
nodesAddedToQueue[i] = true;
}
}
}
}
}
private static void BreadthFirstSearch(int[][] adjMatrix, int n, int origin, int dest)
{
bool[] visited = new bool[n];
char lastvisitedNode = '0';
Dictionary <char, char> nodeOriginMapping = new Dictionary <char, char>();
//Introduced the below array for avoiding Dictionary
int[] originArray = new int[n];
for (int z = 0; z < n; z++)
{
originArray[z] = -1;
}
Queues.DoublyLinkedListGenericQueue <int> queue = new Queues.DoublyLinkedListGenericQueue <int>();
int i = origin;
while (true)
{
for (int j = 0; j < n; j++)
{
if (adjMatrix[i][j] != 0)
{
if (visited[j] != true)
{
if (!nodeOriginMapping.ContainsKey((char)(j + 65)))
{
nodeOriginMapping.Add((char)(j + 65), (char)(i + 65));
originArray[j] = i;
visited[j] = true;
queue.push(j);
visited[i] = true;
lastvisitedNode = (char)(j + 65);
}
else
{
Console.WriteLine("Unexpected Code block BreadthFirstSearch 1");
}
}
}
}
if (queue.peek() != null)
{
i = (int)queue.pop();
}
else
{
break;
}
}
//while (nodeOriginMapping.ContainsKey(lastvisitedNode))
//{
// Console.Write(lastvisitedNode + "<- ");
// lastvisitedNode = nodeOriginMapping[lastvisitedNode];
//}
while (originArray[(int)lastvisitedNode - 65] != -1)
{
Console.Write(lastvisitedNode + "<- ");
lastvisitedNode = (char)(originArray[(int)lastvisitedNode - 65] + 65);
}
Console.Write((char)(origin + 65));
}
