Good code is its own best documentation. As you are about to add a comment, ask yourself, How can I improve the code so that this comment isn't needed? Improve the code and then document it to make it even clearer. Steve McConnell
Write a program to print the Binary tree vertically using the hash table.
All the items from the tree:4 2 5 1 6 3 7 Print Binary tree items vertically:[-1=, 0=[1, 6], -2=, 1=, 2=]