There are 2 rounds:

Phone interview: Behavioral & practical (Tell a time when you had to figure out a solution to a problem from scratch — meaning you didn’t have any expertise or exposure to the problem before) On-site interview: Technical

Delete leaf nodes from a BST (example and input provided) with certain conditions (once you have deleted the leaf then delete its parent first before moving on to the next leaf) and either print them to the screen or insert the results to a list/array