diff --git a/DFS_Depth First Search b/DFS_Depth First Search new file mode 100644 index 0000000..1c04a8b --- /dev/null +++ b/DFS_Depth First Search @@ -0,0 +1,86 @@ +// C++ program to print DFS traversal from +// a given vertex in a given graph +#include +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 *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[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::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); +} + +// Driver code +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; +}