79 lines
2.4 KiB
Java
79 lines
2.4 KiB
Java
|
import java.util.InputMismatchException;
|
||
|
|
import java.util.LinkedList;
|
||
|
|
import java.util.Queue;
|
||
|
|
import java.util.Scanner;
|
||
|
|
|
||
|
|
public class BFS
|
||
|
|
{
|
||
|
|
|
||
|
|
private Queue<Integer> queue;
|
||
|
|
|
||
|
|
public BFS()
|
||
|
|
{
|
||
|
|
queue = new LinkedList<Integer>();
|
||
|
|
}
|
||
|
|
|
||
|
|
public void bfs(int adjacency_matrix[][], int source)
|
||
|
|
{
|
||
|
|
int number_of_nodes = adjacency_matrix[source].length - 1;
|
||
|
|
int[] visited = new int[number_of_nodes + 1];
|
||
|
|
int i, element;
|
||
|
|
visited[source] = 1;
|
||
|
|
queue.add(source);
|
||
|
|
while (!queue.isEmpty())
|
||
|
|
{
|
||
|
|
element = queue.remove();
|
||
|
|
i = element;
|
||
|
|
System.out.print(i + "\t");
|
||
|
|
while (i <= number_of_nodes)
|
||
|
|
{
|
||
|
|
if (adjacency_matrix[element][i] == 1 && visited[i] == 0)
|
||
|
|
{
|
||
|
|
queue.add(i);
|
||
|
|
visited[i] = 1;
|
||
|
|
}
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public static void main(String... arg)
|
||
|
|
{
|
||
|
|
int number_no_nodes, source;
|
||
|
|
Scanner scanner = null;
|
||
|
|
try
|
||
|
|
{
|
||
|
|
System.out.println("Enter the number of nodes in the graph");
|
||
|
|
scanner = new Scanner(System.in);
|
||
|
|
number_no_nodes = scanner.nextInt();
|
||
|
|
int adjacency_matrix[][] = new int[number_no_nodes + 1][number_no_nodes + 1];
|
||
|
|
System.out.println("Enter the adjacency matrix");
|
||
|
|
for (int i = 1; i <= number_no_nodes; i++)
|
||
|
|
for (int j = 1; j <= number_no_nodes; j++)
|
||
|
|
adjacency_matrix[i][j] = scanner.nextInt();
|
||
|
|
System.out.println("Enter the source for the graph");
|
||
|
|
source = scanner.nextInt();
|
||
|
|
System.out.println("The BFS traversal of the graph is ");
|
||
|
|
BFS bfs = new BFS();
|
||
|
|
bfs.bfs(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 BFS traversal of the graph is
|
||
|
|
1 2 4 3
|