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package Algorithms;

import java.util.Iterator;

import java.util.LinkedList;

public class DepthFirstSearch {

public static void main(String args[])

{

Graph g = new Graph(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);

g.DFS(2);

}

}

class Graph {

private int numVertices;

private LinkedList<Integer> adj[];

private boolean visited[];

public Graph(int vertices) {

numVertices = vertices;

adj = new LinkedList[vertices];

visited = new boolean[vertices];

for (int i = 0; i < vertices; i++)

adj[i] = new LinkedList<Integer>();

}

void addEdge(int src, int dest) {

adj[src].add(dest);

}

void DFS(int vertex) {

visited[vertex] = true;

System.out.print(vertex + " ");

Iterator ite = adj[vertex].listIterator();

while (ite.hasNext()) {

int adj = (int) ite.next();

if (!visited[adj])

DFS(adj);

}

}

}