Flipkart Senior Software Developer interview questions

Round 1: The person who took this round was very polite and helpful. This 1 was programming round for 2 hours. Implement UNDO/REDO functions in Text Editor. You are expected to write test cases as well. The interviewer helped me in every stage, it was good experience. Round 2: The person who took this round was just opposite to the previous one. I think he is fresher from IIT or some blah blah known Engg college. He does not know how to handle with experienced person. He should learn a lot in this area before taking any interview. Company should provide some sort of training for these people about interview. I am not telling this round should not be there for Exp candidate, there should be some formal and proper way should be. You have set of axis, you have to plot a line which has more number of axis in it. (College mathematics question) Some puzzle.