Create DFS.cpp

DFS.cpp

@@ -0,0 +1,62 @@
+// C++ program to print DFS traversal from
+// a given vertex in a given graph
+#include <bits/stdc++.h>
+using namespace std;
+
+// Graph class represents a directed graph
+// using adjacency list representation
+class Graph {
+public:
+	map<int, bool> visited;
+	map<int, list<int> > adj;
+
+	// 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);
+};
+
+void Graph::addEdge(int v, int w)
+{
+	adj[v].push_back(w); // Add w to v’s list.
+}
+
+void Graph::DFS(int v)
+{
+	// 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])
+			DFS(*i);
+}
+
+// Driver's code
+int main()
+{
+	// Create a graph given in the above diagram
+	Graph g;
+	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";
+
+	// Function call
+	g.DFS(2);
+
+	return 0;
+}
+
+// improved by Vishnudev C