Execute BFS in disconnected graph

Here given code implementation process.

//C Program
//Perform bfs in disconnected graph

#include<stdio.h>

#include<stdlib.h>

struct AjlistNode {
	int vId; //Vertices id
	struct AjlistNode *next;
};

struct Graph {
	int data; //node key value
	struct AjlistNode *next;
};

struct Queue {
	int element;
	struct Queue *next;
};

int size; //number of nodes

//set node key value
void set_data(struct Graph *node) {
	if (node != NULL && size > 0) {
		int index = 0;
		for (index; index < size; index++) {
			//set vertic node data
			node[index].data = index; //set node key
			//Initial no AjlistNode
			//Set NULL Value
			node[index].next = NULL;
		}
	} else {
		printf("Vertic Node is Empty");
	}
}
//Add Queue Element
void enqueue(int data, struct Queue **queue) {
	struct Queue *newNode = (struct Queue *) malloc(sizeof(struct Queue));

	if (newNode != NULL) {
		newNode->element = data;
		newNode->next = NULL;
		if ( *queue != NULL) {
			struct Queue *temp = *queue;
			while (temp->next != NULL) {
				temp = temp->next;
			}
			temp->next = newNode;
		} else {
			*queue = newNode;
		}
	} else {
		printf("\n Memory overflow");
	}
}
//remove single element into queue
void dequeue(struct Queue **queue) {
	struct Queue *temp = ( *queue);
	( *queue) = temp->next;
	free(temp);
	temp = NULL;
}
//Add Edge from Two given Nodes
void add_edge(struct Graph *node, int V, int E) {
	//add edge form V to E
	//V and E is Node location
	if (V < size && E < size) {
		//first create Adjacency node
		struct AjlistNode *newEdge = (struct AjlistNode *) malloc(
			sizeof(struct AjlistNode)
		);
		if (newEdge != NULL) {

			newEdge->next = NULL;
			newEdge->vId = E;

			struct AjlistNode *temp = node[V].next;

			if (temp == NULL) {
				node[V].next = newEdge;
			} else {
				//Add node at last
				while (temp->next != NULL) {
					temp = temp->next;
				}
				temp->next = newEdge;
			}
		} else {
			printf("\n Memory overflow");
		}
	} else {
		//not valid Vertices
		printf("Invalid Node Vertices %d  %d", V, E);
	}
}
//Display Adjacency list of vertex
void print_graph(struct Graph *node) {
	if (node != NULL) {
		struct AjlistNode *temp = NULL;
		for (int index = 0; index < size; index++) {
			printf("\n Adjacency list of vertex %d  :", index);
			temp = node[index].next;
			while (temp != NULL) {
				//temp->vId is graph node vertices
				//in this case temp->vId is same as 
				//node[temp->vId].data

				printf("  %d", node[temp->vId].data);
				temp = temp->next;
			}
		}
	} else {
		printf("Empty Graph");
	}
}
//Breadth First Traversal for a directed graph node
void bfs(int point, struct Graph *node, int *visit) {

	struct Queue *queue = NULL;
	struct AjlistNode *temp = NULL;


	//Add first element into queue
	enqueue(point, & queue);

	while (queue != NULL) {

		temp = node[queue->element].next;

		while (temp != NULL) {

			if (visit[temp->vId] == 0) {
				visit[temp->vId] = 1;
				enqueue(temp->vId, & queue);
			}
			temp = temp->next;
		}
		visit[queue->element] = 1;

		printf("%3d", queue->element);

		dequeue( & queue);

	}

}
void view_bfs(int point, struct Graph *node) {
	if (point > size || node == NULL) {
		return;
	}

	printf("\n bfs :");
	int *visit = (int *) calloc(size, sizeof(int));
	bfs(point, node, visit);
	for (int i = 0; i < size; ++i) {
		if (visit[i] == 0) {
			bfs(i, node, visit);
		}
	}
}
int main() {
	//Set number of graph node
	size = 7;

	struct Graph *node = NULL;
	node = (struct Graph *) malloc(sizeof(struct Graph) *size);

	if (node == NULL) {
		printf("\n Memory overflow");
	} else {
		//First set node keys
		set_data(node);
		//Connected two node with Edges
		add_edge(node, 0, 1);
		add_edge(node, 0, 5);
		add_edge(node, 2, 1);
		add_edge(node, 2, 6);
		add_edge(node, 3, 2);
		add_edge(node, 3, 4);
		add_edge(node, 4, 5);
		add_edge(node, 6, 0);
		add_edge(node, 6, 5);
		print_graph(node);

		int start = 6;
		view_bfs(start, node);
	}
	return 0;
}

Output

 Adjacency list of vertex 0  :  1  5
 Adjacency list of vertex 1  :
 Adjacency list of vertex 2  :  1  6
 Adjacency list of vertex 3  :  2  4
 Adjacency list of vertex 4  :  5
 Adjacency list of vertex 5  :
 Adjacency list of vertex 6  :  0  5
 bfs :  6  0  5  1  2  3  4
// C++ program
// Perform bfs in disconnected graph
#include<iostream>

using namespace std;
class AjlistNode {
	public:

		//Vertices node key
		int id;
	AjlistNode *next;
	AjlistNode(int value) {
		//Set value of node key
		this->id = value;
		this->next = NULL;
	}
};
class Vertices {
	public:
	int data;
	AjlistNode *next;
    Vertices()
    {
      this->data = 0;
      this->next = NULL;
    }
	Vertices(int value) {
		this->data = value;
		this->next = NULL;
	}
};
class MyQueue {
	public:
		int element;
	MyQueue *next;
	MyQueue(int value) {
		this->element = value;
		this->next = NULL;
	}
};
class MyGraph {
	public:

	//number of Vertices
	int size;
	Vertices *node;
	MyQueue *front;
	MyQueue *tail;
	MyGraph(int value) {
		//set value
		this->front = NULL;
		this->tail = NULL;
		this->size = value;
		this->node = new Vertices[size];
		//set initial values of graph node
		this->set_data();
	}
	//Set initial node value
	void set_data() {
		if (this->node == NULL) {
			cout << "\nEmpty Graph";
		} else {
			int index = 0;
			while (index < this->size) {
				this->node[index] = index;
				index++;
			}
		}
	}
	//Connect two node
	void add_edge(int start, int end) {
		AjlistNode *newEdge = new AjlistNode(end);
		if (this->node[start].next == NULL) {
			//Include first adjacency list node of location start 
			this->node[start].next = newEdge;
		} else {
			AjlistNode *temp = this->node[start].next;
			//Add new node at the end of edge
			while (temp->next != NULL) {
				temp = temp->next;
			}
			//Add node 
			temp->next = newEdge;
		}
	}
	//Display graph elements
	void print_graph() {
		if (this->size > 0 &&
			this->node != NULL) {
			int index = 0;
			while (index < this->size) {
				cout << "\nAdjacency list of vertex " << index << " :";
				AjlistNode *temp = this->node[index].next;
				while (temp != NULL) {
					cout << this->node[temp->id].data << " ";
					temp = temp->next;
				}
				index++;
			}
		}
	}
	void enqueue(int value) {
		MyQueue *newNode = new MyQueue(value);
		if (newNode != NULL) {
			if (this->front == NULL) {
				this->front = newNode;
				this->tail = newNode;
			} else {
				this->tail->next = newNode;
				this->tail = newNode;
			}
		} else {
			cout << "\n Memory overflow";
		}
	}
	void dequeue() {
		MyQueue *temp = this->front;
		this->front = temp->next;
		if (this->tail == temp) {
			this->tail = NULL;
		}
		temp = NULL;
	}
	void bfs(int point, bool visit[]) {
		AjlistNode *temp = NULL;
		this->enqueue(point);
		while (this->front != NULL) {
			temp = this->node[this->front->element].next;
			while (temp != NULL) {
				if (visit[temp->id] == false) {
					visit[temp->id] = true;
					this->enqueue(temp->id);
				}
				temp = temp->next;
			}
			visit[this->front->element] = true;
			cout << this->front->element << " ";
			this->dequeue();
		}
	}
	void view_bfs(int point) {
		if (point > this->size ||
			this->node == NULL) {
			return;
		}
		bool *visit = new bool[size];
		int i = 0;
		cout << "\n bfs : ";
		this->bfs(point, visit);
		while (i < this->size) {
			if (visit[i] == false) {
				this->bfs(i, visit);
			}
			i++;
		}
	}
};
int main() {
	//Number of nodes
	int totalNode = 7;
	MyGraph g =  MyGraph(totalNode);
	//Connected two node with Edges
	g.add_edge(0, 1);
	g.add_edge(0, 5);
	g.add_edge(2, 1);
	g.add_edge(2, 6);
	g.add_edge(3, 2);
	g.add_edge(3, 4);
	g.add_edge(4, 5);
	g.add_edge(6, 0);
	g.add_edge(6, 5);
	g.print_graph();
	//Start location
	int start = 6;
	g.view_bfs(start);
	return 0;
}

Output

Adjacency list of vertex 0 :1 5
Adjacency list of vertex 1 :
Adjacency list of vertex 2 :1 6
Adjacency list of vertex 3 :2 4
Adjacency list of vertex 4 :5
Adjacency list of vertex 5 :
Adjacency list of vertex 6 :0 5
 bfs : 6 0 5 1 2 3 4
// Java program
// Perform bfs in disconnected graph

class AjlistNode {
  //Vertices node key
  public int id; 
  public AjlistNode next;

  public AjlistNode(int value) {
    //Set value of node key
    id = value;
    next = null;
  }
}
class Vertices {

  public int data;
  public AjlistNode next;

  public Vertices(int value) {
    data = value;
    next = null;
  }
}

class MyQueue {
  public int element;
  public MyQueue next;
  public MyQueue(int value) 
  {
    element = value;
    next = null;
  }
}
public class MyGraph {


  //number of Vertices
  private int size;

  private Vertices[] node;

  private MyQueue front;
  private MyQueue tail;

  public MyGraph(int value) {
    //set value

    front = null;
    tail = null;
    size = value;

    node = new Vertices[size];
    //set initial values of graph node
    this.set_data();


  }

  //Set initial node value
  public void set_data() {
    if (node == null) {
      System.out.println("\nEmpty Graph");
    } else {

      int index = 0;

      while (index < size) {
  
        node[index] = new Vertices(index);

        index++;
      }
    }
  }


  //Connect two node
  public void add_edge(int start, int end) {
    AjlistNode newEdge = new AjlistNode(end);

    if (node[start].next == null) 
    {
      //Include first adjacency list node of location start 
      node[start].next = newEdge;
    }
    else 
    {
      AjlistNode temp = node[start].next;
      //Add new node at the end of edge
      while (temp.next != null) 
      {
        temp = temp.next;
      }
      //Add node 
      temp.next = newEdge;
    }
  }
  //Display graph elements
  public void print_graph() {

    if (size > 0 && node != null) {
      int index = 0;
      while (index < size) {
        System.out.print("\nAdjacency list of vertex " + index + " :");
        AjlistNode temp = node[index].next;
        while (temp != null) {
          System.out.print(node[temp.id].data + "  ");
          temp = temp.next;
        }
        index++;
      }
    }
  }
  public void enqueue(int value) {
    MyQueue newNode = new MyQueue(value);

    if (newNode != null) {
      if (front == null) {
        front = newNode;
        tail = newNode;
      } else {
        tail.next = newNode;
        tail = newNode;
      }
    } else {

      System.out.print("\n Memory overflow");
    }
  }
  public void dequeue() {
    MyQueue temp = front;
    front = temp.next;
    if (tail == temp) {
      tail = null;
    }
    temp = null;
  }
  public void bfs(int point, boolean[] visit) {

    AjlistNode temp = null;

    enqueue(point);

    while (front != null) {

      temp = node[front.element].next;

      while (temp != null) {

        if (visit[temp.id] == false) {
          visit[temp.id] = true;
          enqueue(temp.id);
        }
        temp = temp.next;
      }
      visit[front.element] = true;

      System.out.print(front.element + "  ");
      dequeue();
    }
  }
  public void view_bfs(int point) {

    if (point > size || node == null) {
      return;
    }
    boolean[] visit = new boolean[size];
    int i = 0;
    System.out.print("\n bfs : ");


    bfs(point, visit);

    while (i < size) {

      if (visit[i] == false) {
        bfs(i, visit);
      }
      i++;
    }

  }


  public static void main(String[] args) {
    //Number of nodes
    int totalNode = 7;

    MyGraph g = new MyGraph(totalNode);
    //Connected two node with Edges
    g.add_edge(0, 1);
    g.add_edge(0, 5);
    g.add_edge(2, 1);
    g.add_edge(2, 6);
    g.add_edge(3, 2);
    g.add_edge(3, 4);
    g.add_edge(4, 5);
    g.add_edge(6, 0);
    g.add_edge(6, 5);
    g.print_graph();

    //Start location
    int start = 6;

    g.view_bfs(start);

  }
}

Output

Adjacency list of vertex 0 :1 5
Adjacency list of vertex 1 :
Adjacency list of vertex 2 :1 6
Adjacency list of vertex 3 :2 4
Adjacency list of vertex 4 :5
Adjacency list of vertex 5 :
Adjacency list of vertex 6 :0 5
 bfs : 6 0 5 1 2 3 4
// C# program
// Perform bfs in disconnected graph
using System;
class AjlistNode {
	//Vertices node key
	public int id;
	public AjlistNode next;
	public AjlistNode(int value) {
		//Set value of node key
		id = value;
		next = null;
	}
}
class Vertices {
	public int data;
	public AjlistNode next;
	public Vertices(int value) {
		data = value;
		next = null;
	}
}
class MyQueue {
	public int element;
	public MyQueue next;
	public MyQueue(int value) {
		element = value;
		next = null;
	}
}
public class MyGraph {
	//number of Vertices
	private int size;
	private Vertices[] node;
	private MyQueue front;
	private MyQueue tail;
	public MyGraph(int value) {
		//set value
		front = null;
		tail = null;
		size = value;
		node = new Vertices[size];
		this.set_data();
	}
	//Set initial node value
	public void set_data() {
		if (node == null) {
			Console.WriteLine("\nEmpty Graph");
		} else {
			int index = 0;
			while (index < size) {
				node[index] = new Vertices(index);
				index++;
			}
		}
	}
	//Connect two node
	public void add_edge(int start, int end) {
		AjlistNode newEdge = new AjlistNode(end);
		if (node[start].next == null) {
			//Include first adjacency list node of location start 
			node[start].next = newEdge;
		} else {
			AjlistNode temp = node[start].next;
			//Add new node at the end of edge
			while (temp.next != null) {
				temp = temp.next;
			}
			//Add node 
			temp.next = newEdge;
		}
	}
	//Display graph elements
	public void print_graph() {
		if (size > 0 &&
			node != null) {
			int index = 0;
			while (index < size) {
				Console.Write("\nAdjacency list of vertex " + index + " : ");
				AjlistNode temp = node[index].next;
				while (temp != null) {
					Console.Write(node[temp.id].data + " ");
					temp = temp.next;
				}
				index++;
			}
		}
	}
	public void enqueue(int value) {
		MyQueue newNode = new MyQueue(value);
		if (newNode != null) {
			if (front == null) {
				front = newNode;
				tail = newNode;
			} else {
				tail.next = newNode;
				tail = newNode;
			}
		} else {
			Console.Write("\n Memory overflow");
		}
	}
	public void dequeue() {
		MyQueue temp = front;
		front = temp.next;
		if (tail == temp) {
			tail = null;
		}
		temp = null;
	}
	public void bfs(int point, Boolean[] visit) {
		AjlistNode temp = null;
		enqueue(point);
		while (front != null) {
			temp = node[front.element].next;
			while (temp != null) {
				if (visit[temp.id] == false) {
					visit[temp.id] = true;
					enqueue(temp.id);
				}
				temp = temp.next;
			}
			visit[front.element] = true;
			Console.Write(front.element + " ");
			dequeue();
		}
	}
	public void view_bfs(int point) {
		if (point > size ||
			node == null) {
			return;
		}
		Boolean[] visit = new Boolean[size];
		int i = 0;
		Console.Write("\n bfs : ");
		bfs(point, visit);
		while (i < size) {
			if (visit[i] == false) {
				bfs(i, visit);
			}
			i++;
		}
	}
	public static void Main(String[] args) {
		//Number of nodes
		int totalNode = 7;
		MyGraph g = new MyGraph(totalNode);
		g.add_edge(0, 1);
		g.add_edge(0, 5);
		g.add_edge(2, 1);
		g.add_edge(2, 6);
		g.add_edge(3, 2);
		g.add_edge(3, 4);
		g.add_edge(4, 5);
		g.add_edge(6, 0);
		g.add_edge(6, 5);
		g.print_graph();
		//Start location
		int start = 6;
		g.view_bfs(start);
	}
}

Output

Adjacency list of vertex 0 : 1 5
Adjacency list of vertex 1 :
Adjacency list of vertex 2 : 1 6
Adjacency list of vertex 3 : 2 4
Adjacency list of vertex 4 : 5
Adjacency list of vertex 5 :
Adjacency list of vertex 6 : 0 5
 bfs : 6 0 5 1 2 3 4
<?php
// Php program
// Perform bfs in disconnected graph
class AjlistNode {
	//Vertices node key

	public $id;
	public $next;

	function __construct($value) {
		//Set value of node key
		$this->id = $value;
		$this->next = null;
	}
}
class Vertices {
	public $data;
	public $next;

	function __construct($value) {
		$this->data = $value;
		$this->next = null;
	}
}
class MyQueue {
	public $element;
	public $next;

	function __construct($value) {
		$this->element = $value;
		$this->next = null;
	}
}
class MyGraph {
	//number of Vertices

	private $size;
	private $node;
	private $front;
	private $tail;

	function __construct($value) {
		//set value
		$this->front = null;
		$this->tail = null;
		$this->size = $value;
		$this->node = array_fill(0, $this->size, null);
		//set initial values of graph node
		$this->set_data();
	}
	//Set initial node value

	public 	function set_data() {
		if ($this->node == null) {
			echo("\nEmpty Graph");
		} else {
			$index = 0;
			while ($index < $this->size) {
				$this->node[$index] = new Vertices($index);
				$index++;
			}
		}
	}
	//Connect two node

	public 	function add_edge($start, $last) {
		$newEdge = new AjlistNode($last);
		if ($this->node[$start]->next == null) {
			//Include first adjacency list node of location start 
			$this->node[$start]->next = $newEdge;
		} else {
			$temp = $this->node[$start]->next;
			//Add new node at the end of edge
			while ($temp->next != null) {
				$temp = $temp->next;
			}
			//Add node 
			$temp->next = $newEdge;
		}
	}
	//Display graph elements

	public 	function print_graph() {
		if ($this->size > 0 &&
			$this->node != null) {
			$index = 0;
			while ($index < $this->size) {
				echo("\nAdjacency list of vertex ". $index ." : ");
				$temp = $this->node[$index]->next;
				while ($temp != null) {
					echo($this->node[$temp->id]->data ." ");
					$temp = $temp->next;
				}
				$index++;
			}
		}
	}
	public 	function enqueue($value) {
		$newNode = new MyQueue($value);
		if ($newNode != null) {
			if ($this->front == null) {
				$this->front = $newNode;
				$this->tail = $newNode;
			} else {
				$this->tail->next = $newNode;
				$this->tail = $newNode;
			}
		} else {
			echo("\n Memory overflow");
		}
	}
	public 	function dequeue() {
		$temp = $this->front;
		$this->front = $temp->next;
		if ($this->tail == $temp) {
			$this->tail = null;
		}
		$temp = null;
	}
	public 	function bfs($point, & $visit) {
		$temp = null;
		$this->enqueue($point);
		while ($this->front != null) {
			$temp = $this->node[$this->front->element]->next;
			while ($temp != null) {
				if ($visit[$temp->id] == false) {
					$visit[$temp->id] = true;
					$this->enqueue($temp->id);
				}
				$temp = $temp->next;
			}
			$visit[$this->front->element] = true;
			echo($this->front->element ." ");
			$this->dequeue();
		}
	}
	public 	function view_bfs($point) {
		if ($point > $this->size ||
			$this->node == null) {
			return;
		}
		$visit = array_fill(0, $this->size, false);
		$i = 0;
		echo("\n bfs : ");
		$this->bfs($point, $visit);
		while ($i < $this->size) {
			if ($visit[$i] == false) {
				$this->bfs($i, $visit);
			}
			$i++;
		}
	}
}

function main() {
	//Number of nodes
	$totalNode = 7;
	$g = new MyGraph($totalNode);
	//Connected two node with Edges
	$g->add_edge(0, 1);
	$g->add_edge(0, 5);
	$g->add_edge(2, 1);
	$g->add_edge(2, 6);
	$g->add_edge(3, 2);
	$g->add_edge(3, 4);
	$g->add_edge(4, 5);
	$g->add_edge(6, 0);
	$g->add_edge(6, 5);
	$g->print_graph();
	//Start location
	$start = 6;
	$g->view_bfs($start);

}
main();

Output

Adjacency list of vertex 0 : 1 5
Adjacency list of vertex 1 :
Adjacency list of vertex 2 : 1 6
Adjacency list of vertex 3 : 2 4
Adjacency list of vertex 4 : 5
Adjacency list of vertex 5 :
Adjacency list of vertex 6 : 0 5
 bfs : 6 0 5 1 2 3 4
// Node Js program
// Perform bfs in disconnected graph
class AjlistNode {
	//Vertices node key

	constructor(value) {
		//Set value of node key
		this.id = value;
		this.next = null;
	}
}
class Vertices {
	constructor(value) {
		this.data = value;
		this.next = null;
	}
}
class MyQueue {
	constructor(value) {
		this.element = value;
		this.next = null;
	}
}
class MyGraph {
	//number of Vertices

	constructor(value) {
		//set value
		this.front = null;
		this.tail = null;
		this.size = value;
		this.node = Array(this.size).fill(null);
		//set initial values of graph node
		this.set_data();
	}

	//Set initial node value
	set_data() {
		if (this.node == null) {
			process.stdout.write("\nEmpty Graph");
		} else {
			var index = 0;
			while (index < this.size) {
				this.node[index] = new Vertices(index);
				index++;
			}
		}
	}

	//Connect two node
	add_edge(start, last) {
		var newEdge = new AjlistNode(last);
		if (this.node[start].next == null) {
			//Include first adjacency list node of location start 
			this.node[start].next = newEdge;
		} else {
			var temp = this.node[start].next;
			//Add new node at the end of edge
			while (temp.next != null) {
				temp = temp.next;
			}

			//Add node 
			temp.next = newEdge;
		}
	}

	//Display graph elements
	print_graph() {
		if (this.size > 0 &&
			this.node != null) {
			var index = 0;
			while (index < this.size) {
				process.stdout.write("\nAdjacency list of vertex " + index + " : ");
				var temp = this.node[index].next;
				while (temp != null) {
					process.stdout.write(this.node[temp.id].data + " ");
					temp = temp.next;
				}
				index++;
			}
		}
	}
	enqueue(value) {
		var newNode = new MyQueue(value);
		if (newNode != null) {
			if (this.front == null) {
				this.front = newNode;
				this.tail = newNode;
			} else {
				this.tail.next = newNode;
				this.tail = newNode;
			}
		} else {
			process.stdout.write("\n Memory overflow");
		}
	}
	dequeue() {
		var temp = this.front;
		this.front = temp.next;
		if (this.tail == temp) {
			this.tail = null;
		}
		temp = null;
	}
	bfs(point, visit) {
		var temp = null;
		this.enqueue(point);
		while (this.front != null) {
			temp = this.node[this.front.element].next;
			while (temp != null) {
				if (visit[temp.id] == false) {
					visit[temp.id] = true;
					this.enqueue(temp.id);
				}
				temp = temp.next;
			}
			visit[this.front.element] = true;
			process.stdout.write(this.front.element + " ");
			this.dequeue();
		}
	}
	view_bfs(point) {
		if (point > this.size ||
			this.node == null) {
			return;
		}
		var visit = Array(this.size).fill(false);
		var i = 0;
		process.stdout.write("\n bfs : ");
		this.bfs(point, visit);
		while (i < this.size) {
			if (visit[i] == false) {
				this.bfs(i, visit);
			}
			i++;
		}
	}
}

function main(args) {
	//Number of nodes
	var totalNode = 7;
	var g = new MyGraph(totalNode);
	//Connected two node with Edges
	g.add_edge(0, 1);
	g.add_edge(0, 5);
	g.add_edge(2, 1);
	g.add_edge(2, 6);
	g.add_edge(3, 2);
	g.add_edge(3, 4);
	g.add_edge(4, 5);
	g.add_edge(6, 0);
	g.add_edge(6, 5);
	g.print_graph();
	//Start location
	var start = 6;
	g.view_bfs(start);
}

main();

Output

Adjacency list of vertex 0 : 1 5
Adjacency list of vertex 1 :
Adjacency list of vertex 2 : 1 6
Adjacency list of vertex 3 : 2 4
Adjacency list of vertex 4 : 5
Adjacency list of vertex 5 :
Adjacency list of vertex 6 : 0 5
 bfs : 6 0 5 1 2 3 4
#  Python 3 program
#  Perform bfs in disconnected graph
class AjlistNode :

	def __init__(self, value) :
		# Set value of node key
		self.id = value
		self.next = None
	

class Vertices :
	
	def __init__(self, value) :
		self.data = value
		self.next = None
	

class MyQueue :
	
	def __init__(self, value) :
		self.element = value
		self.next = None
	

class MyGraph :
	
	def __init__(self, value) :
		# set value
		self.front = None
		self.tail = None
		self.size = value
		self.node = [None] * self.size
		# set initial values of graph node
		self.set_data()
	
	# Set initial node value
	def set_data(self) :
		if (self.node == None) :
			print("\nEmpty Graph", end = "")
		else :
			index = 0
			while (index < self.size) :
				self.node[index] = Vertices(index)
				index += 1
			
		
	
	# Connect two node
	def add_edge(self, start, last) :
		newEdge = AjlistNode(last)
		if (self.node[start].next == None) :
			# Include first adjacency list node of location start 
			self.node[start].next = newEdge
		else :
			temp = self.node[start].next
			# Add new node at the end of edge
			while (temp.next != None) :
				temp = temp.next
			
			# Add node 
			temp.next = newEdge
		
	
	# Display graph elements
	def print_graph(self) :
		if (self.size > 0 and self.node != None) :
			index = 0
			while (index < self.size) :
				print("\nAdjacency list of vertex ", index ," : ", end = "")
				temp = self.node[index].next
				while (temp != None) :
					print(self.node[temp.id].data ," ", end = "")
					temp = temp.next
				
				index += 1
			
		
	
	def enqueue(self, value) :
		newNode = MyQueue(value)
		if (newNode != None) :
			if (self.front == None) :
				self.front = newNode
				self.tail = newNode
			else :
				self.tail.next = newNode
				self.tail = newNode
			
		else :
			print("\n Memory overflow", end = "")
		
	
	def dequeue(self) :
		temp = self.front
		self.front = temp.next
		if (self.tail == temp) :
			self.tail = None
		
		temp = None
	
	def bfs(self, point, visit) :
		temp = None
		self.enqueue(point)
		while (self.front != None) :
			temp = self.node[self.front.element].next
			while (temp != None) :
				if (visit[temp.id] == False) :
					visit[temp.id] = True
					self.enqueue(temp.id)
				
				temp = temp.next
			
			visit[self.front.element] = True
			print(self.front.element ," ", end = "")
			self.dequeue()
		
	
	def view_bfs(self, point) :
		if (point > self.size or self.node == None) :
			return
		
		visit = [False] * self.size
		i = 0
		print("\n bfs : ", end = "")
		self.bfs(point, visit)
		while (i < self.size) :
			if (visit[i] == False) :
				self.bfs(i, visit)
			
			i += 1
		
	

def main() :
	# Number of nodes
	totalNode = 7
	g = MyGraph(totalNode)
	# Connected two node with Edges
	g.add_edge(0, 1)
	g.add_edge(0, 5)
	g.add_edge(2, 1)
	g.add_edge(2, 6)
	g.add_edge(3, 2)
	g.add_edge(3, 4)
	g.add_edge(4, 5)
	g.add_edge(6, 0)
	g.add_edge(6, 5)
	g.print_graph()
	# Start location
	start = 6
	g.view_bfs(start)


if __name__ == "__main__":
	main()

Output

Adjacency list of vertex  0  : 1  5
Adjacency list of vertex  1  :
Adjacency list of vertex  2  : 1  6
Adjacency list of vertex  3  : 2  4
Adjacency list of vertex  4  : 5
Adjacency list of vertex  5  :
Adjacency list of vertex  6  : 0  5
 bfs : 6  0  5  1  2  3  4
#  Ruby program
 #  Perform bfs in disconnected graph
class AjlistNode
    # Define the accessor and reader of class AjlistNode
    attr_reader :id, :next
    attr_accessor :id, :next 

	def initialize(value) 
		 # Set value of node key
		@id = value
		@next = nil
	end
end
class Vertices
    # Define the accessor and reader of class Vertices
    attr_reader :data, :next
    attr_accessor :data, :next 
	
	def initialize(value) 
		@data = value
		@next = nil
	end
end
class MyQueue
    # Define the accessor and reader of class MyQueue
    attr_reader :element, :next
    attr_accessor :element, :next 
	
	def initialize(value) 
		@element = value
		@next = nil
	end
end
class MyGraph
    # Define the accessor and reader of class MyGraph
    attr_reader :size, :node, :front, :tail
    attr_accessor :size, :node, :front, :tail 

	def initialize(value) 
		 # set value
		@front = nil
		@tail = nil
		@size = value
		@node = Array.new(@size) {nil}
		 # set initial values of graph node
		self.set_data()
	end
	 # Set initial node value
	def set_data() 
		if (@node == nil) 
			print("\nEmpty Graph")
		else 
			index = 0
			while (index < @size) 
				@node[index] = Vertices.new(index)
				index += 1
			end
		end
	end
	 # Connect two node
	def add_edge(start, last) 
		newEdge = AjlistNode.new(last)
		if (@node[start].next == nil) 
			 # Include first adjacency list node of location start 
			@node[start].next = newEdge
		else 
			temp = @node[start].next
			 # Add new node at the end of edge
			while (temp.next != nil) 
				temp = temp.next
			end
			 # Add node 
			temp.next = newEdge
		end
	end
	 # Display graph elements
	def print_graph() 
		if (@size > 0 &&
			@node != nil) 
			index = 0
			while (index < @size) 
				print("\nAdjacency list of vertex ", index ," : ")
				temp = @node[index].next
				while (temp != nil) 
					print(@node[temp.id].data ," ")
					temp = temp.next
				end
				index += 1
			end
		end
	end
	def enqueue(value) 
		newNode = MyQueue.new(value)
		if (newNode != nil) 
			if (@front == nil) 
				@front = newNode
				@tail = newNode
			else 
				@tail.next = newNode
				@tail = newNode
			end
		else 
			print("\n Memory overflow")
		end
	end
	def dequeue() 
		temp = @front
		@front = temp.next
		if (@tail == temp) 
			@tail = nil
		end
		temp = nil
	end
	def bfs(point, visit) 
		temp = nil
		self.enqueue(point)
		while (@front != nil) 
			temp = @node[@front.element].next
			while (temp != nil) 
				if (visit[temp.id] == false) 
					visit[temp.id] = true
					self.enqueue(temp.id)
				end
				temp = temp.next
			end
			visit[@front.element] = true
			print(@front.element ," ")
			self.dequeue()
		end
	end
	def view_bfs(point) 
		if (point > @size ||
			@node == nil) 
			return
		end
		visit = Array.new(@size) {false}
		i = 0
		print("\n bfs  :")
		self.bfs(point, visit)
		while (i < @size) 
			if (visit[i] == false) 
				self.bfs(i, visit)
			end
			i += 1
		end
	end
end
def main() 
	 # Number of nodes
	totalNode = 7
	g = MyGraph.new(totalNode)
	 # Connected two node with Edges
	g.add_edge(0, 1)
	g.add_edge(0, 5)
	g.add_edge(2, 1)
	g.add_edge(2, 6)
	g.add_edge(3, 2)
	g.add_edge(3, 4)
	g.add_edge(4, 5)
	g.add_edge(6, 0)
	g.add_edge(6, 5)
	g.print_graph()
	 # Start location
	start = 6
	g.view_bfs(start)
end
main()

Output

Adjacency list of vertex 0 : 1 5 
Adjacency list of vertex 1 : 
Adjacency list of vertex 2 : 1 6 
Adjacency list of vertex 3 : 2 4 
Adjacency list of vertex 4 : 5 
Adjacency list of vertex 5 : 
Adjacency list of vertex 6 : 0 5 
 bfs  :6 0 5 1 2 3 4 
// Scala program
// Perform bfs in disconnected graph
class AjlistNode(var id: Int,
	var next: AjlistNode) {
	
	def this(value: Int) {
       this(value,null);
	}
}
class Vertices(var data: Int,
	var next: AjlistNode) {


	def this(value: Int) {
		this(value,null);
	}
}
class MyQueue(var element: Int,
	var next: MyQueue) {


	def this(value: Int) {
		this(value,null);
	}
}
class MyGraph(var size: Int,
	var node: Array[Vertices],
		var front: MyQueue,
			var tail: MyQueue) {
	def this(value: Int) {
		//set value
        this(value,Array.fill[Vertices](value)(null),null,null);
		//set initial values of graph node
		this.set_data();
	}
	//Set initial node value
	def set_data(): Unit = {
		if (this.node == null) {
			print("\nEmpty Graph");
		} else {
			var index: Int = 0;
			while (index < this.size) {
				this.node(index) = new Vertices(index);
				index += 1;
			}
		}
	}
	//Connect two node
	def add_edge(start: Int, last: Int): Unit = {
		var newEdge: AjlistNode = new AjlistNode(last);

		if (this.node(start).next == null) {
			//Include first adjacency list node of location start 
			this.node(start).next = newEdge;
		} else {
			var temp: AjlistNode = this.node(start).next;

			//Add new node at the end of edge
			while (temp.next != null) {
				temp = temp.next;
			}
			//Add node 
			temp.next = newEdge;
		}
	}
	//Display graph elements
	def print_graph(): Unit = {
		if (this.size > 0 &&
			this.node != null) {
			var index: Int = 0;
			while (index < this.size) {
				print("\nAdjacency list of vertex " + index + " : ");
				var temp: AjlistNode = this.node(index).next;
				while (temp != null) {
					print(" "+this.node(temp.id).data + " ");
					temp = temp.next;
				}
				index += 1;
			}
		}
	}
	def enqueue(value: Int): Unit = {
		var newNode: MyQueue = new MyQueue(value);

		if (newNode != null) {
			if (this.front == null) {
				this.front = newNode;
				this.tail = newNode;
			} else {
				this.tail.next = newNode;
				this.tail = newNode;
			}
		} else {
			print("\n Memory overflow");
		}
	}
	def dequeue(): Unit = {
		var temp: MyQueue = this.front;
		this.front = temp.next;

		if (this.tail == temp) {
			this.tail = null;
		}
		temp = null;
	}
	def bfs(point: Int, visit: Array[Boolean]): Unit = {
		var temp: AjlistNode = null;
		enqueue(point);
		while (this.front != null) {
			temp = this.node(this.front.element).next;
			while (temp != null) {
				if (visit(temp.id) == false) {
					visit(temp.id) = true;
					enqueue(temp.id);
				}
				temp = temp.next;
			}
			visit(this.front.element) = true;
			print(" "+this.front.element );
			dequeue();
		}
	}
	def view_bfs(point: Int): Unit = {
		if (point > this.size ||
			this.node == null) {
			return;
		}
		var visit: Array[Boolean] = Array.fill[Boolean](this.size)(false);
		var i: Int = 0;
		print("\n bfs : ");
		bfs(point, visit);
		while (i < this.size) {
			if (visit(i) == false) {
				bfs(i, visit);
			}
			i += 1;
		}
	}
}
object Main {
	def main(args: Array[String]): Unit = {
		//Number of nodes
		var totalNode: Int = 7;
		var g: MyGraph = new MyGraph(totalNode);

		//Connected two node with Edges
		g.add_edge(0, 1);
		g.add_edge(0, 5);
		g.add_edge(2, 1);
		g.add_edge(2, 6);
		g.add_edge(3, 2);
		g.add_edge(3, 4);
		g.add_edge(4, 5);
		g.add_edge(6, 0);
		g.add_edge(6, 5);
		g.print_graph();

		//Start location
		var start: Int = 6;
		g.view_bfs(start);
	}
}

Output

Adjacency list of vertex 0 :  1  5
Adjacency list of vertex 1 :
Adjacency list of vertex 2 :  1  6
Adjacency list of vertex 3 :  2  4
Adjacency list of vertex 4 :  5
Adjacency list of vertex 5 :
Adjacency list of vertex 6 :  0  5
 bfs :  6 0 5 1 2 3 4
// Swift program
// Perform bfs in disconnected graph
class AjlistNode {
	//Vertices node key
	var id: Int;
	var next: AjlistNode? ;
	init(_ value: Int) {
		//Set value of node key
		self.id = value;
		self.next = nil;
	}
}
class Vertices {
	var data: Int;
	var next: AjlistNode? ;
	init(_ value: Int) {
		self.data = value;
		self.next = nil;
	}
}
class MyQueue {
	var element: Int;
	var next: MyQueue? ;
	init(_ value: Int) {
		self.element = value;
		self.next = nil;
	}
}
class MyGraph {
	//number of Vertices
	var size: Int;
	var node: [Vertices]? = [Vertices]() ;
	var front: MyQueue? ;
	var tail: MyQueue? ;
	init(_ value: Int) {
		//set value
		self.front = nil;
		self.tail = nil;
		self.size = value;
		
		var i = 0;
		while (i<value) {
          self.node!.append(Vertices(i));
          i+=1;
        }
	}

	//Connect two node
	func add_edge(_ start: Int, _ last: Int) {
		let newEdge: AjlistNode? = AjlistNode(last);
		if (self.node![start].next == nil) {
			//Include first adjacency list node of location start 
			self.node![start].next = newEdge;
		} else {
			var temp: AjlistNode? = self.node![start].next;
			//Add new node at the end of edge
			while (temp!.next != nil) {
				temp = temp!.next;
			}
			//Add node 
			temp!.next = newEdge;
		}
	}
	//Display graph elements
	func print_graph() {
		if (self.size > 0 &&
			self.node != nil) {
			var index: Int = 0;
			while (index < self.size) {
				print("\nAdjacency list of vertex ", index ," : ", terminator : "");
				var temp: AjlistNode? = self.node![index].next;
				while (temp != nil) {
					print(self.node![temp!.id].data ," ", terminator : "");
					temp = temp!.next;
				}
				index += 1;
			}
		}
	}
	func enqueue(_ value: Int) {
		let newNode: MyQueue? = MyQueue(value);
		if (newNode != nil) {
			if (self.front == nil) {
				self.front = newNode;
				self.tail = newNode;
			} else {
				self.tail!.next = newNode;
				self.tail = newNode;
			}
		} else {
			print("\n Memory overflow", terminator : "");
		}
	}
	func dequeue() {
		var temp: MyQueue? = self.front;
		self.front = temp!.next;
		if (self.tail === temp) {
			self.tail = nil;
		}
		temp = nil;
	}
	func bfs(_ point: Int, _ visit: inout[Bool]) {
		var temp: AjlistNode? = nil;
		self.enqueue(point);
		while (self.front != nil) {
			temp = self.node![self.front!.element].next;
			while (temp != nil) {
				if (visit[temp!.id] == false) {
					visit[temp!.id] = true;
					self.enqueue(temp!.id);
				}
				temp = temp!.next;
			}
			visit[self.front!.element] = true;
			print(self.front!.element ," ", terminator : "");
			self.dequeue();
		}
	}
	func view_bfs(_ point: Int) {
		if (point > self.size ||
			self.node == nil) {
			return;
		}
		var visit: [Bool] = Array(repeating: false, count: self.size);
		var i: Int = 0;
		print("\n bfs : ", terminator : "");
		self.bfs(point, &visit);
		while (i < self.size) {
			if (visit[i] == false) {
				self.bfs(i, &visit);
			}
			i += 1;
		}
	}
}
func main() {
	//Number of nodes
	let totalNode: Int = 7;
	let g: MyGraph? = MyGraph(totalNode);
	//Connected two node with Edges
	g!.add_edge(0, 1);
	g!.add_edge(0, 5);
	g!.add_edge(2, 1);
	g!.add_edge(2, 6);
	g!.add_edge(3, 2);
	g!.add_edge(3, 4);
	g!.add_edge(4, 5);
	g!.add_edge(6, 0);
	g!.add_edge(6, 5);
	g!.print_graph();
	//Start location
	let start: Int = 6;
	g!.view_bfs(start);
}
main();

Output

Adjacency list of vertex  0  : 1  5
Adjacency list of vertex  1  :
Adjacency list of vertex  2  : 1  6
Adjacency list of vertex  3  : 2  4
Adjacency list of vertex  4  : 5
Adjacency list of vertex  5  :
Adjacency list of vertex  6  : 0  5
 bfs : 6  0  5  1  2  3  4


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