public static void ReadTree()
{
var nodeCount = int.Parse(Console.ReadLine());
for (int i = 0; i < nodeCount - 1; i++)
{
var edge = Console.ReadLine()
.Trim()
.Split(" ", StringSplitOptions.RemoveEmptyEntries)
.Select(int.Parse)
.ToList();
treeService.AddEdge(edge[0], edge[1]);
}
}