public void AddLink(Node from, Node to)
        {
            // мб проверка на null  и мб дубликаты??
            Array.Resize(ref from.links, from.links.Length + 1);

            Random random = new Random();
            while (from.value == to.value)
            {
                to = nodes[random.Next(0, countNodes)];
            }

            if (from.links.Length >=2)
            {
                int i = 0;
                while (i>from.links.Length)
                {
                    if (to.value == from.links[i].to.value)
                    {
                        to = nodes[random.Next(0, countNodes)];
                        i = from.links.Length;
                    }
                    else i++;
                }
            }

           from.links[from.links.Length - 1] = new Link(from, to);
        }