public static void Main()
{
int N = int.Parse(Console.ReadLine());
TreeNode<int>[] nodes = SaveNodes(N);
GenNodesConnections(N, nodes);
Tree<int> tree = new Tree<int>(nodes);
// Task 1
TreeNode<int> root = tree.Root;
Console.WriteLine("Root : {0}", root.Value);
Console.WriteLine(new string('-', 40));
// Task 2
List<TreeNode<int>> leafs = tree.FindAllLeafs();
Print(leafs, "All leafs : ");
Console.WriteLine(new string('-', 40));
// Task 3
List<TreeNode<int>> middleNodes = tree.FindAllMiddleNodes();
Print(middleNodes, "All middle nodes : ");
Console.WriteLine(new string('-', 40));
// Task 4
int longestPath = tree.FindLongestPath(root);
Console.WriteLine("The longest path : {0}", longestPath);
Console.WriteLine(new string('-', 40));
int S = 10;
// Task 5
tree.PrintAllPathsWithSumS(S);
// Task 6
tree.PrintAllSubTreesWithSumS(S);
}