class Contauner {

    private List<Point> _points = new List<Point>;

    public Contauner() {}

    public Contauner(List<Point> points) {
        this._points = points;
    }

    public void addPoint(Point point) {
        this._points.Add(point);
    }

    public void deletePointByIndex(int index){
        this._points.RemoveAt(index);
    }

    public void deletePoint(Point point){
        this._points.RemoveAt(point);
    }

    public Point this[int i]
    {
      get { return this._points.get(i); }
      set { this._points.get(i) = value; }
    }

    public List<Point> Points
    {
         get { return _points; }
         set { _points = value; }
    }
}