Interviewed with Several people

Recruiter contacted me after I applied online and quickly scheduled a phone interview and said I will be asked simple programming questions. On the phone, interviewer called and general resume talks. I was asked following question: 1. Find greatest element in a binary search tree 2. Find second greatest element in a BST without sorting and without in-order traversal Stumbled on the second question. They are looking for extremely talented candidates with fast pace pickups on trees and C.