static void SetComponentAllVerts(GraphVertex[] graph, ComponentIndex comp1, ComponentIndex comp2)
{
foreach (int j in comp2.verts)
{
graph[j].componentIndex = comp1;
comp1.verts.Add(j);
}
comp1.index = Math.Min(comp1.index, comp2.index);
}
static void MergeComponents(GraphVertex[] graph, ComponentIndex comp1, ComponentIndex comp2)
{
if (comp1.verts.Count > comp2.verts.Count)
{
SetComponentAllVerts(graph, comp1, comp2);
}
else
{
SetComponentAllVerts(graph, comp2, comp1);
}
}
static void dfs(GraphVertex[] graph, int i, ref bool[] visited, ref ComponentIndex ci)
{
visited[i] = true;
if (graph[i] == null)
{
graph[i] = new GraphVertex();
}
graph[i].componentIndex = ci;
graph[i].componentIndex.verts.Add(i);
foreach (int j in graph[i].neighbours)
{
if (!visited[j])
{
dfs(graph, j, ref visited, ref ci);
}
}
}
static int Calculate(GraphVertex[] graph)
{
bool[] visited = new bool[graph.Length + 1];
int result = 0;
for (int i = 1; i < graph.Length; i++)
{
if (visited[i] == false)
{
ComponentIndex ci = new ComponentIndex()
{
index = result
};
dfs(graph, i, ref visited, ref ci);
result++;
}
}
return(result - 1);
}