1. Tree problem. Maximize the sum of set of elements from the tree such that if some node exists in the set, then its parent and children must not exist in the set. 2. Tell me some example of problem statement you have liked so far. How did you solve it. 3. Bit manipulation question (swapping lower 4 bit with higher 4 per byte of an integer) 4. Stack using linked list 5. OS related questions. Basic. Know the name of chapters from text book and general idea of that name, definition. Not mandatory to know details, or even you can say you don't know. 6. Why Nvidia?