private void dfs(DiGraph g, int begin)
{
isMarked[begin] = true;
inStack[begin] = true;
for (int node = 0; node < g.getAdj(begin).Count; node++)
{
// if (hasCycle()) return;
int nodeValue = g.getAdj(begin)[node];
if (!isMarked[nodeValue])
{
edgeTo[nodeValue] = begin;
dfs(g, nodeValue);
}
else if (inStack[nodeValue])
{ // 如果当前路径Stack中含有node，又再次访问的话，说明有环
// 将环保存下来
Stack <int> cycle = new Stack <int>();
for (int i = begin; i != nodeValue; i = edgeTo[i])
{
cycle.Push(i);
}
cycle.Push(nodeValue);
//cycle.Push(begin);
cycleList2.Add(cycle);
}
}
inStack[begin] = false;
}
public DirectedDFS(DiGraph g, int begin)
{ // 从begin节点开始，进行深搜
reversePost = new List <int>();
isMarked = new bool[g.getVetx()];
edgeTo = new int[g.getVetx()];
this.begin = new List <int>();
this.begin.Add(begin);
dfs(g, begin);
}
public DiGraph reverse()
{
DiGraph g = new DiGraph(Vetx);
for (int i = 0; i < Vetx; i++)
{
for (int j = 0; j < adj[i].Count; j++)
{
g.addEdge(adj[i][j], i);
}
}
return(g);
}
public void dfs(DiGraph g, int begin)
{ // 深搜将所有节点遍历,标记被访问过的节点
isMarked[begin] = true;
for (int node = 0; node < g.getAdj(begin).Count; node++)
{
int nodeValue = g.getAdj(begin)[node];
if (!isMarked[nodeValue])
{
edgeTo[nodeValue] = begin;
dfs(g, nodeValue);
}
}
reversePost.Add(begin);
}
public DirectedDFS(DiGraph g, List <int> begins)
{ // 找出一堆begin中所有可达的地方
reversePost = new List <int>();
isMarked = new bool[g.getVetx()];
edgeTo = new int[g.getVetx()];
this.begin = begins;
for (int i = 0; i < begin.Count; i++)
{
if (!isMarked[i])
{
dfs(g, begin[i]);
}
}
}
public DirectedCycle(DiGraph g)
{
inStack = new bool[g.getVetx()];
edgeTo = new int[g.getVetx()];
cycleList = new List <Stack <Vertex> >();
cycleList2 = new List <Stack <int> >();
isMarked = new bool[g.getVetx()];
for (int i = 0; i < g.getVetx(); i++)
{
if (!isMarked[i])
{
dfs(g, i);
}
}
}
private List <int> reversePost; // 拓扑排序顺序
public DirectedDFS(DiGraph g)
{ // 所有节点遍历
reversePost = new List <int>();
isMarked = new bool[g.getVetx()];
edgeTo = new int[g.getVetx()];
List <int> begins = new List <int>();
for (int i = 0; i < g.getVetx(); i++)
{
begins.Add(i);
}
this.begin = begins;
for (int i = 0; i < g.getVetx(); i++)
{
if (!isMarked[i])
{
dfs(g, i);
}
}
}