public KosarajuAlgorithm(DGraph G)
{
TopologicalSorting Gts = new TopologicalSorting(G);
DGraph Gtr = G.Transposition();
int[] mark = new int[G.VerticesCount];
for (int i = 0; i < G.VerticesCount; ++i)
mark[i] = -1;
SCCEdg = new List<List<DEdge>>();
SCCVrt = new List<List<int>>();
for (int i = Gtr.VerticesCount - 1; i >= 0; --i)
if (mark[Gts[i]] == -1)
{
List<DEdge> tscce = new List<DEdge>();
SCCEdg.Add(tscce);
List<int> tsccv = new List<int>();
SCCVrt.Add(tsccv);
AddSCC(Gts[i], ref mark, Gtr);
SCCVrt[SCCCount].Sort();
++SCCCount;
}
}
public TopologicalSorting(DGraph G)
{
TS = new List<int>();
bool[] was = new bool[G.VerticesCount];
for (int i = 0; i < G.VerticesCount; ++i)
if (!was[i])
DFS(i, ref was, G);
}
void DFS(int v, ref bool[] was, DGraph G)
{
was[v] = true;
for (int i = 0; i < G.VertexDegree(v); ++i)
if (!was[G.GetEdge(v, i).End])
DFS(G.GetEdge(v, i).End, ref was, G);
TS.Add(v);
}
public DGraph(DGraph g)
: this(g.VerticesCount)
{
for (int i = 0; i < g.VerticesCount; ++i)
for (int j = 0; j < g[i].Count; ++j)
{
G[i].Add(g[i, j]);
++edg_num;
}
}
void AddSCC(int v, ref int[] mark, DGraph G)
{
mark[v] = SCCCount;
SCCVrt[SCCCount].Add(v);
for (int i = 0; i < G.VertexDegree(v); ++i)
if (mark[G.GetEdge(v, i).End] == SCCCount || mark[G.GetEdge(v, i).End] == -1)
{
SCCEdg[SCCCount].Add(G.GetEdge(v, i).Reverse());
if (mark[G.GetEdge(v, i).End] == -1)
AddSCC(G.GetEdge(v, i).End, ref mark, G);
}
}
private void ReadGraphFromATextFile_Click(object sender, EventArgs e)
{
openInputTxt.ShowDialog();
string file = openInputTxt.FileName;
G = new DGraph();
G.ReadFromTxtFile(file);
}
private void ReadGraphFromAConsole_Click(object sender, EventArgs e)
{
AllocConsole();
G = new DGraph();
G.ReadFromConsole();
FreeConsole();
}
public DGraph Transposition()
{
DGraph res = new DGraph(VerticesCount);
for (int i = 0; i < VerticesCount; ++i)
for (int j = 0; j < VertexDegree(i); ++j)
res.AddEdge(GetEdge(i, j).Reverse());
return res;
}