We all know that there are 3 most popular types of tree traversals namely pre-order, in-order and post-order traversal. Among these three, the in-order traversal of BST gives us the output elements arranged in ascending or increasing order. Now, what if we require the elements to be output in decreasing/descending order??? …. I have found out a very interesting article here covering this technique i-e reverse in-order traversing.