Depth First Search

Author: Shagunaawasthi

Data Structures/DFS.cpp

@@ -0,0 +1,77 @@
+
+#include<iostream>
+#include<list>
+using namespace std;
+
+
+class Graph
+{
+    int V;
+
+
+    list<int> *adj;
+
+    void DFSUtil(int v, bool visited[]);
+public:
+    Graph(int V);
+
+
+    void addEdge(int v, int w);
+
+
+    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);
+}
+
+void Graph::DFSUtil(int v, bool visited[])
+{
+
+    visited[v] = true;
+    cout << v << " ";
+
+
+    list<int>::iterator i;
+    for (i = adj[v].begin(); i != adj[v].end(); ++i)
+        if (!visited[*i])
+            DFSUtil(*i, visited);
+}
+
+
+void Graph::DFS(int v)
+{
+
+    bool *visited = new bool[V];
+    for (int i = 0; i < V; i++)
+        visited[i] = false;
+
+
+    DFSUtil(v, visited);
+}
+
+int main()
+{
+
+    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 << " Depth First Traversal"
+            " (starting from vertex 0) \n";
+    g.DFS(0);
+
+    return 0;
+}