Create dfs

dfs

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+#include<iostream> 
+#include<list> 
+using namespace std; 
+
+// Graph class represents a directed graph 
+// using adjacency list representation 
+class Graph 
+{ 
+    int V;    // No. of vertices 
+
+    // Pointer to an array containing 
+    // adjacency lists 
+    list<int> *adj; 
+
+    // A recursive function used by DFS 
+    void DFSUtil(int v, bool visited[]); 
+public: 
+    Graph(int V);   // Constructor 
+
+    // function to add an edge to graph 
+    void addEdge(int v, int w); 
+
+    // DFS traversal of the vertices 
+    // reachable from v 
+    void DFS(int v); 
+}; 
+
+Graph::Graph(int V) 
+{ 
+    this->V = V; 
+    adj = new list<int>[V]; 
+} 
+
+void Graph::addEdge(int v, int w) 
+{ 
+    adj[v].push_back(w); // Add w to v’s list. 
+} 
+
+void Graph::DFSUtil(int v, bool visited[]) 
+{ 
+    // Mark the current node as visited and 
+    // print it 
+    visited[v] = true; 
+    cout << v << " "; 
+
+    // Recur for all the vertices adjacent 
+    // to this vertex 
+    list<int>::iterator i; 
+    for (i = adj[v].begin(); i != adj[v].end(); ++i) 
+        if (!visited[*i]) 
+            DFSUtil(*i, visited); 
+} 
+
+// DFS traversal of the vertices reachable from v. 
+// It uses recursive DFSUtil() 
+void Graph::DFS(int v) 
+{ 
+    // Mark all the vertices as not visited 
+    bool *visited = new bool[V]; 
+    for (int i = 0; i < V; i++) 
+        visited[i] = false; 
+
+    // Call the recursive helper function 
+    // to print DFS traversal 
+    DFSUtil(v, visited); 
+} 
+
+int main() 
+{ 
+    // Create a graph given in the above diagram 
+    Graph g(4); 
+    g.addEdge(0, 1); 
+    g.addEdge(0, 2); 
+    g.addEdge(1, 2); 
+    g.addEdge(2, 0); 
+    g.addEdge(2, 3); 
+    g.addEdge(3, 3); 
+
+    cout << "Following is Depth First Traversal"
+            " (starting from vertex 2) \n"; 
+    g.DFS(2); 
+
+    return 0; 
+}