private ArrayList<Location> getAllLocationsRec(){
    ArrayList<Location> res = new ArrayList<>();
    if (this.visited){
        return res;
    }
    this.visited = true;
    res.add(this);
    for (int i = 0; i < this.neighbors.length; i++){
        res.addAll(this.neighbors[i].getAllLocationsRec());
    }
    return res;
}

public ArrayList<Location> getAllLocations(){
    ArrayList<Location> res = this.getAllLocationsRec();
    // reinitialize the locations
    for (int i = 0; i < res.size(); i++){
        res.get(i).visited = false;
    }
    return res;
}

private ArrayList<Edge> getAllEdgesRec(){
    ArrayList<Edge> res = new ArrayList<>();
    if (this.visited){
        return res;
    }
    this.visited = true;
    for (int i = 0; i < this.neighbors.length; i++){
        if (!this.neighbors[i].visited) {
            Edge edge = new Edge(this, this.neighbors[i]);
            res.add(edge);
        }
    }
    for (int i = 0; i < this.neighbors.length; i++){
        if (!this.neighbors[i].visited) {
            res.addAll(this.neighbors[i].getAllEdgesRec());
        }
    }
    return res;
}

public ArrayList<Edge> getAllEdges(){
    ArrayList<Edge> res = this.getAllEdgesRec();
    // reinitialize the locations
    for (int i = 0; i < res.size(); i++){
        res.get(i).getFrom().visited = false;
        res.get(i).getTo().visited = false;
    }
    return res;
}