Morgan Stanley Summer Analyst - Technology interview questions

First there was an online test which had coding questions, mental ability questions, and programming MCQs as well. Next round was a technical round. First a coding question was asked based on writing power of a number, then I was asked to optimize the code. Then there were questions based on DBMS, OOPs and Operating Systems. The final round was a combination of technical and HR round. First he asked me about my previous internships, then gave me a question based on finding next smallest permutation of a number.