Oracle Software Engineer II interview questions

1st Round:- 1) What framework do you use, explain 2) An Array of repeated numbers, find the highest occurrence number. 3) An array of integers, which specify price of stock. find out when is it best to buy and to sell 2nd Round:- System test given a laptop with visual studio and NUnit, tests were already written, asked me to write implementation Then HR told me, they will come back with the feedback.

What is the most difficult project you have worked on so far? How did you manage to get it done?