Number of Islands, Level Order (and Zigzag) Tree Traversal, Word Series (Word Ladder 1 & 2, Word Break 1 & 2, Word Search 1 & 2). "parking lot" OOD question Remove all duplicate numbers from a list. Given huge database of sentences, write a class to find most frequently used words Questions on data structures like array list, linked list, hash table, binary search tree. Differences between these data structures and when would you use which one. Inheritance and Composition. First round: 2-3 behavioral questions followed by a coding question. The question was given a binary tree find a subtree within the binary tree that adds up to a certain target sum. Second round: 2-3 behavoral questions followed by an OOD question. The question was a bit vague and I had a hard time understanding their english but essentially it was to design a wharehouse class that had certain constraints such that the particular wharehouse could only store certain products.