private static int IsGraphBipartiteness(GraphArrayOfList graph)
{
color = new int[graph.Vertexes.Length];
for (int i = 0; i < graph.Vertexes.Length; i++)
{
if (color[i] != 0)
{
continue;
}
color[i] = 1;
if (!DFS(graph, i))
{
return -1;
}
}
return 1;
}
private static bool DFS(GraphArrayOfList graph, int v)
{
foreach(int n in graph.Vertexes[v])
{
if (color[n] == 0)
{
color[n] = 3 - color[v];
if (!DFS(graph, n))
{
return false;
}
}
else
{
if (color[n] + color[v] != 3)
{
return false;
}
}
}
return true;
}
public GraphsArrayOfList(string fileName)
{
string filePath = Utils.GetFullFilePath(fileName);
try
{
using (StreamReader reader = new StreamReader(filePath))
{
string line;
int iLine = 0;
int iGraph = -1;
int iEdge = 0;
bool curLineIsGraphArgs = false;
while ((line = reader.ReadLine()) != null)
{
switch (iLine)
{
case 0:
_count = int.Parse(line);
_GraphsArrayOfList = new GraphArrayOfList[_count];
break;
default:
if (line == "")
{
iGraph++;
curLineIsGraphArgs = true;
break;
}
if (curLineIsGraphArgs)
{
curLineIsGraphArgs = false;
string[] args = line.Split(' ');
int countVerticles = int.Parse(args[0]);
int countEdges = int.Parse(args[1]);
_GraphsArrayOfList[iGraph] = new GraphArrayOfList();
_GraphsArrayOfList[iGraph].Vertexes = new List<int>[countVerticles];
for(int i = 0; i < _GraphsArrayOfList[iGraph].Vertexes.Length; i++)
{
_GraphsArrayOfList[iGraph].Vertexes[i] = new List<int>();
}
iEdge = 0;
}
else
{
string[] edge = line.Split(' ');
int v0 = int.Parse(edge[0]);
int v1 = int.Parse(edge[1]);
_GraphsArrayOfList[iGraph].Vertexes[v0 - 1].Add(v1 - 1);
_GraphsArrayOfList[iGraph].Vertexes[v1 - 1].Add(v0 - 1);
iEdge++;
}
break;
}
iLine++;
}
}
}
catch (Exception e)
{
// Let the user know what went wrong.
Console.WriteLine("The file could not be read:");
Console.WriteLine(e.Message);
}
}
