class Graph {
  ArrayList<ArrayList<Integer>> adj;
  ArrayList<ArrayList<Integer>> coords;
  int V;
  Graph(int v) {
    V = v;
    adj = new ArrayList<ArrayList<Integer>>(V);
    coords = new ArrayList<ArrayList<Integer>>(V);
    for (int i = 0; i < V; i++) {
      adj.add(new ArrayList<Integer>());
      coords.add(new ArrayList<Integer>());
    }
  }

  void draw_vis(boolean[] vis) {
    strokeWeight(20);
    stroke(255);
    for (int i = 0; i < coords.size(); i++) {
      if (!vis[i]) continue;
      point(coords.get(i).get(0), coords.get(i).get(1));
      text(i+1, coords.get(i).get(0)-4, coords.get(i).get(1)+5);
    }
  }

  void draw_points(int point_weight) {
    strokeWeight(point_weight);
    stroke(#FF0000);
    for (int i = 0; i < coords.size(); i++) {
      point(coords.get(i).get(0), coords.get(i).get(1));
      text(i+1, coords.get(i).get(0)-3, coords.get(i).get(1)+5);
    }
  }

  void draw_graph(int graph_weight, int point_weight) {
    stroke(#550000);
    strokeWeight(10);
    for (int i = 0; i < adj.size(); i++) {
      for (int idx = 0; idx < adj.get(i).size(); idx++) {
        int e = adj.get(i).get(idx);
        draw_arrow(coords.get(i).get(0), coords.get(i).get(1), coords.get(e).get(0), coords.get(e).get(1), point_weight, graph_weight);
      }
    }
  }

  void set_coords(int idx, int x, int y) {
    coords.get(idx).add(x);
    coords.get(idx).add(y);
  }

  void add_edge(int u, int v) {
    adj.get(u).add(v);
  }
}