83 lines
2.6 KiB
Java
83 lines
2.6 KiB
Java
|
import java.util.InputMismatchException;
|
||
|
|
import java.util.Scanner;
|
||
|
|
import java.util.Stack;
|
||
|
|
|
||
|
|
public class DFS
|
||
|
|
{
|
||
|
|
private Stack<Integer> stack;
|
||
|
|
|
||
|
|
public DFS()
|
||
|
|
{
|
||
|
|
stack = new Stack<Integer>();
|
||
|
|
}
|
||
|
|
|
||
|
|
public void dfs(int adjacency_matrix[][], int source)
|
||
|
|
{
|
||
|
|
int number_of_nodes = adjacency_matrix[source].length - 1;
|
||
|
|
int visited[] = new int[number_of_nodes + 1];
|
||
|
|
int element = source;
|
||
|
|
int i = source;
|
||
|
|
System.out.print(element + "\t");
|
||
|
|
visited[source] = 1;
|
||
|
|
stack.push(source);
|
||
|
|
while (!stack.isEmpty())
|
||
|
|
{
|
||
|
|
element = stack.peek();
|
||
|
|
i = element;
|
||
|
|
while (i <= number_of_nodes)
|
||
|
|
{
|
||
|
|
if (adjacency_matrix[element][i] == 1 && visited[i] == 0)
|
||
|
|
{
|
||
|
|
stack.push(i);
|
||
|
|
visited[i] = 1;
|
||
|
|
element = i;
|
||
|
|
i = 1;
|
||
|
|
System.out.print(element + "\t");
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
stack.pop();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public static void main(String...arg)
|
||
|
|
{
|
||
|
|
int number_of_nodes, source;
|
||
|
|
Scanner scanner = null;
|
||
|
|
try
|
||
|
|
{
|
||
|
|
System.out.println("Enter the number of nodes in the graph");
|
||
|
|
scanner = new Scanner(System.in);
|
||
|
|
number_of_nodes = scanner.nextInt();
|
||
|
|
int adjacency_matrix[][] = new int[number_of_nodes + 1][number_of_nodes + 1];
|
||
|
|
System.out.println("Enter the adjacency matrix");
|
||
|
|
for (int i = 1; i <= number_of_nodes; i++)
|
||
|
|
for (int j = 1; j <= number_of_nodes; j++)
|
||
|
|
adjacency_matrix[i][j] = scanner.nextInt();
|
||
|
|
System.out.println("Enter the source for the graph");
|
||
|
|
source = scanner.nextInt();
|
||
|
|
System.out.println("The DFS Traversal for the graph is given by ");
|
||
|
|
DFS dfs = new DFS();
|
||
|
|
dfs.dfs(adjacency_matrix, source);
|
||
|
|
}
|
||
|
|
catch(InputMismatchException inputMismatch)
|
||
|
|
{
|
||
|
|
System.out.println("Wrong Input format");
|
||
|
|
}
|
||
|
|
scanner.close();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
Enter the number of nodes in the graph
|
||
|
|
4
|
||
|
|
Enter the adjacency matrix
|
||
|
|
0 1 0 1
|
||
|
|
0 0 1 0
|
||
|
|
0 1 0 1
|
||
|
|
0 0 0 1
|
||
|
|
Enter the source for the graph
|
||
|
|
1
|
||
|
|
The DFS Traversal for the graph is given by
|
||
|
|
1 2 3 4
|