Understanding the range postorder pattern

A binary search tree follows the binary search property where all nodes in the left subtree of a node are smaller than it, while all nodes in the right subtree are greater than it. This property allows for the efficient searching of values in the tree. However, some binary search tree problems require us to find and process not just a single node but all nodes whose value lies in a specified range. Some problems go a step further and may require aggregating these processed values over some function into a single value. Such problems can be efficiently solved using the range postorder technique.

In this lesson, we will learn more about using the range postorder technique to solve binary search tree problems and how to identify a problem as a range postorder pattern problem.