static void Main(string[] args)
{
TreeNode third1 = new TreeNode(5, null, null);
TreeNode second1 = new TreeNode(2, null, third1);
TreeNode second2 = new TreeNode(3, null, null);
TreeNode first = new TreeNode(1, second1, second2);
Solution solo = new Solution();
foreach (string str in solo.BinaryTreePaths(first))
{
Console.WriteLine(str);
}
Console.ReadKey();
}