2 rounds phone interview, 2 easy coding questions for Summer intern. I was contacted with an initial phone two weeks ago. They asked the question about the column based database. The advantage and dis-advantages, and a series of technical questions. I was told to do a coding challenge then. For the first round the question is : find the largest number smaller than K in a binary search tree (given root node) I got contact after a week, the second round just ask another coding question: leetcode phone number translation. That's it, no other question just coding challenge.....