Oracle Applications Developer interview questions

OA 1 LC hard (DSU), CS Core questions Technical Round 1 LC Medium (String), 1 LC hard, 1 OOP Implementation Technical/Managerial Round Resume Grilling and 1 LC Medium HR General discussion about aspirations and oracle

This is the series of interviews for on campus placements. The first round was aptitude round. This was help online. We were given a few MCQs and a coding problem to solve. Time was 1 hour. I was able to move to the next round. Next round was personal interview. I was asked basic intro questions and a tree backtrack problem which I wasn't able to solve.