**CS2852 Data Structures** Lecture Videos Spring 2019 Week 6 Lecture 3 # Introduction [download](lectures/2852-6-3a.mp4)  # Binary Search Tree `size()` [download](lectures/2852-6-3b.mp4)  # Binary Search Tree `isEmpty()`/`clear()` [download](lectures/2852-6-3c.mp4)  # Binary Search Tree `contains()` [download](lectures/2852-6-3d.mp4)  # Binary Search Tree `add()` [download](lectures/2852-6-3e.mp4)  # In class activity — recursive `add()` [download](lectures/2852-6-3f.mp4)  # Recursive `add()` [download](lectures/2852-6-3g.mp4)