// Just to vaidate output static void Main(string[] args) { /*int[] arr = new int[] { 4, 3, 3, 2, 5}; * var x = Arrays.FindDisappearedNumbers(arr); * foreach (int num in x) * { * Console.Write(num + " "); * }*/ // Console.WriteLine(x); var x = Trees.InorderTraversalIterative(GenerateTree()); Console.WriteLine(x); }