// create a graph class 
class Graph { 
    // defining vertex array and 
    // adjacent list 
    constructor(noOfVertices) 
    { 
        this.noOfVertices = noOfVertices; 
        this.AdjList = new Map(); 
    } 
  
    // functions to be implemented 
  
    // addVertex(v) 
    // addEdge(v, w) 
    // printGraph() 
  
    // bfs(v) 
    // dfs(v) 
}

// add vertex to the graph 
addVertex(v) 
{ 
    // initialize the adjacent list with a 
    // null array 
    this.AdjList.set(v, []); 
}

// add edge to the graph 
addEdge(v, w) 
{ 
    // get the list for vertex v and put the 
    // vertex w denoting edge between v and w 
    this.AdjList.get(v).push(w); 
  
    // Since graph is undirected, 
    // add an edge from w to v also 
    this.AdjList.get(w).push(v); 
} 


// Prints the vertex and adjacency list 
printGraph() 
{ 
    // get all the vertices 
    var get_keys = this.AdjList.keys(); 
  
    // iterate over the vertices 
    for (var i of get_keys)  
{ 
        // great the corresponding adjacency list 
        // for the vertex 
        var get_values = this.AdjList.get(i); 
        var conc = ""; 
  
        // iterate over the adjacency list 
        // concatenate the values into a string 
        for (var j of get_values) 
            conc += j + " "; 
  
        // print the vertex and its adjacency list 
        console.log(i + " -> " + conc); 
    } 
}


// Example
var graph = new Graph(6); 
var vertices = [ 'A', 'B', 'C', 'D', 'E', 'F' ]; 
  
// adding vertices 
for (var i = 0; i < vertices.length; i++) { 
    g.addVertex(vertices[i]); 
} 
  
// adding edges 
g.addEdge('A', 'B'); 
g.addEdge('A', 'D'); 
g.addEdge('A', 'E'); 
g.addEdge('B', 'C'); 
g.addEdge('D', 'E'); 
g.addEdge('E', 'F'); 
g.addEdge('E', 'C'); 
g.addEdge('C', 'F'); 
  
// prints all vertex and 
// its adjacency list 
// A -> B D E 
// B -> A C 
// C -> B E F 
// D -> A E 
// E -> A D F C 
// F -> E C 
g.printGraph();