Subject Computer Science Java Programming


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* DirectedGraph class
public class DirectedGraph {

// Field storing vertices map (vertex name --> vertex index)
public HashMap<String,Integer> vertices;
// Field storing adjacency list of edges
public ArrayList<LinkedList<Integer>> adjacencyList;

// Constructor
public DirectedGraph() {
    this.vertices = new HashMap<String,Integer>();
    this.adjacencyList = new ArrayList<LinkedList<Integer>>();

// Method to add vertex to DirectedGraph
public void addVertex(String vertexName) {
    if (!vertices.containsKey(vertexName)) {
      vertices.put(vertexName, vertices.size());
      adjacencyList.add(new LinkedList<Integer...

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