private void Dfs(IGraph g, int v)
{
_marked[v] = true;
_count++;
foreach (int i in g.Adj(v))
{
if (!_marked[i])
{
Dfs(g, i);
}
}
}
private void dfs(int v)
{
visited[v] = true;
foreach (int i in G.Adj(v))
{
if (!visited[i])
{
from[i] = v; // 表示i点从v点来
dfs(i);
}
}
}
private void Dfs(IGraph graph, int v, Action <int> action)
{
action(v);
visited[v] = true;
foreach (int w in graph.Adj(v))
{
if (!visited[w])
{
Dfs(graph, w, action);
}
}
}
private void Dfs(IGraph graph, int v)
{
marked[v] = true;
CountNum++;
foreach (int w in graph.Adj(v))
{
if (!marked[w]) //如果没有走过，则继续深度遍历
{
edgeTo[w] = v;
Dfs(graph, w);
}
}
}
private void dfs(IGraph graph, int v)
{
_marked[v] = true;
foreach (int w in graph.Adj(v))
{
if (_marked[w])
{
continue;
}
_edgeTo[w] = v;
dfs(graph, w);
}
}
private void dfs(IGraph graph, int v)
{
_marked[v] = true; // отмечаем вершину
_id[v] = _count; // поставляем номер компонента
foreach (int i in graph.Adj(v))
{
if (_marked[i])
{
continue;
}
dfs(graph, i);
}
}
private void Dfs(IGraph g, int v)
{
this.marked[v] = true;
IEnumerable <int> adjacent = g.Adj(v);
foreach (int w in adjacent)
{
if (!marked[w])
{
Dfs(g, w);
edgeTo[w] = v;
}
}
}
// 深度遍历v的所有邻边
private void dfs(int v)
{
visted[v] = true;
id[v] = count;
IEnumerable <int> iterator = G.Adj(v);
foreach (int i in iterator)
{
if (!visted[i])
{
dfs(i);
}
}
}
private void dfs(IGraph graph, int v, int u)
{
_marked[v] = true;
foreach (int w in graph.Adj(v))
{
if (!_marked[w])
{
dfs(graph, w, v);
}
else if (w != u)
{
_hasCycle = true;
}
}
}
private void dfs(IGraph g, int v)
{
//前向排序是顶点的顺序遍历之前的顺序
pre.Enqueue(v);
marked[v] = true;
foreach (int w in g.Adj(v))
{
if (!marked[w])
{
dfs(g, w);
}
}
post.Enqueue(v); //这个是逆序的
reversePost.Push(v); //递归后将顶点压栈
}
//计算自环的个数
public static int NumberOfSelfLoops(IGraph g)
{
int count = 0;
for (int v = 0; v < g.V; v++)
{
foreach (int w in g.Adj(v))
{
if (v == w)
{
count++;
}
}
}
return(count / 2); //每条边都被记过两次
}
private void Dfs(IGraph g, int v, int u)
{
marked[v] = true;
id[v] = count;
foreach (int w in g.Adj(v))
{
if (!marked[w])
{
Dfs(g, w, v);
}
else if (w != u)
{
HasCycle = true;
}
}
}
private void dfs(IGraph graph, int v)
{
_marked[v] = true;
foreach (int w in graph.Adj(v))
{
if (!_marked[w])
{
_color[w] = !_color[v];
dfs(graph, w);
}
else if (_color[w] == _color[v])
{
_isTwoColorable = false;
}
}
}
public static int NumberOfSelfLoops(this IGraph graph)
{
int count = 0;
for (int i = 0; i < graph.V; i++)
{
foreach (int j in graph.Adj(i))
{
if (j == i)
{
count++;
}
}
}
//In graph theory, the degree (or valency) of a vertex of a graph
// is the number of edges incident to the vertex,
// WITH LOOPS COUNTED TWICE.
return(count / 2);
}
int[] ord; // 记录路径节点的次序
public ShortestPath(IGraph g, int s)
{
this.g = g;
this.s = s;
if (s < 0 && s >= g.V())
{
throw new Exception("s is illegal");
}
this.visted = new bool[g.V()];
this.from = new int[g.V()];
this.ord = new int[g.V()];
for (int i = 0; i < g.V(); i++)
{
from[i] = -1;
ord[i] = -1;
}
// 无向图的最短路径算法
Queue <int> queue = new Queue <int>();
queue.Enqueue(s);
visted[s] = true;
ord[s] = 0;
while (queue.Count > 0)
{
int i = queue.Dequeue();
foreach (var j in g.Adj(i))
{
if (!visted[j])
{
queue.Enqueue(j);
visted[j] = true;
from[j] = i;
ord[j] = ord[i] + 1;
}
}
}
}
private bool Dfs(IGraph graph, int v, int destination, bool[] visited)
{
if (v == destination)
{
return(true);
}
visited[v] = true;
foreach (int w in graph.Adj(v))
{
if (!visited[w])
{
bool pathExists = Dfs(graph, w, destination, visited);
if (pathExists)
{
return(true);
}
}
}
return(false);
}
private void Bfs(IGraph g, int s)
{
var q = new Queue <int>();
_marked[s] = true;
q.Enqueue(s);
while (q.Count > 0)
{
int v = q.Dequeue();
foreach (int w in g.Adj(v))
{
if (!_marked[w])
{
_edgeTo[w] = v;
_marked[w] = true;
q.Enqueue(w);
}
}
}
}
private void Bfs(IGraph g, int s)
{
var queue = new Chapter1.Queue <int>();
marked[s] = true; //起点被标记
queue.Enqueue(s);
while (!queue.IsEmpty)
{
int v = queue.Dequeue(); //从队列中删除一个顶点
foreach (int w in g.Adj(v))
{
if (!marked[w])
{
edgeTo[w] = v;
marked[w] = true;
queue.Enqueue(w);
}
}
}
}
void BFS(IGraph g, int s)
{
var queue = new Queue <int>();
queue.Enqueue(s);
while (queue.Count != 0)
{
var count = queue.Count;
while (count != 0)
{
var v = queue.Dequeue();
foreach (var w in g.Adj(v).Where(w => !marked[w]))
{
marked[w] = true;
edgeTo[w] = v;
queue.Enqueue(w);
}
count -= 1;
}
}
}
/// <summary>
/// Performs action <paramref name="action"/> on each vertex of graph <paramref name="graph"/>, starting from vertex <paramref name="start"/>.
/// </summary>
/// <param name="graph">A graph that will be traversed.</param>
/// <param name="start">A vertex from which the traversal will start.</param>
/// <param name="action">Action that will be performed on each visited vertice.</param>
public static void Traverse(this IGraph graph, int start, Action <int> action)
{
bool[] visited = new bool[graph.V];
Queue <int> toVisit = new Queue <int>();
toVisit.Enqueue(start);
visited[start] = true;
while (toVisit.Count > 0)
{
int current = toVisit.Dequeue();
IEnumerable <int> children = graph.Adj(current);
foreach (int child in children)
{
if (!visited[child])
{
toVisit.Enqueue(child);
visited[child] = true;
}
}
action(current);
}
}
private static void Graph()
{
Graph graph = new Graph(new Scanner(new StreamReader(File.OpenRead("tinyG.txt"))));
Graph graph2 = new Graph(new Scanner(new StreamReader(File.OpenRead("tinyCG.txt"))));
StdOut.Println("输入一个数字: ");
int s = StdIn.ReadInt();
ISearch search = new DepthFirstSearch(graph, s);
for (int v = 0; v < graph.V; v++)
{
if (search.Marked(v))
{
StdOut.Print(v + " ");
}
}
StdOut.Println();
StdOut.Println();
StdOut.Println();
ICC cc = new DepthFirstSearch(graph, s).InitCC();
int M = cc.CountCC();
StdOut.Println(M + " components");
Bag <int>[] components = new Bag <int> [M];
for (int i = 0; i < M; i++)
{
components[i] = new Bag <int>();
}
for (int v = 0; v < graph.V; v++)
{
components[cc.Id(v)].Add(v);
}
for (int i = 0; i < M; i++)
{
foreach (int v in components[i])
{
StdOut.Print(v + " ");
}
StdOut.Println();
}
StdOut.Println(cc.HasCycle);
if (search.Count() != graph.V)
{
StdOut.Print("Not ");
}
StdOut.Println("connected");
IPath path = new DepthFirstSearch(graph2, s);
for (int v = 0; v < graph2.V; v++)
{
StdOut.Print(s + " to " + v + ": ");
if (path.HasPathTo(v))
{
foreach (int x in path.PathTo(v))
{
if (x == s)
{
StdOut.Print(x);
}
else
{
StdOut.Print("-" + x);
}
}
}
StdOut.Println();
}
//符号图
string filename = "routes.txt";
string filename2 = "movies.txt";
string delim = "/";
ISymbolGraph sg = new SymbolGraph(filename2, delim);
IGraph g = sg.G;
while (StdIn.HasNextLine())
{
StdOut.Println("输入查找的字符串");
string source = StdIn.ReadLine();
foreach (int w in g.Adj(sg.Index(source)))
{
StdOut.Println(" " + sg.Name(w));
}
}
}