Optum SDE-intern interview questions

The interview was started with the interviewer’s introduction followed by mine. Then the questioning started from Basic Concepts like OOPs, to which I explained them along with real world examples. Then the questioning went to deep levels as he asked on topics like Friend Functions and Access Specifiers, Virtual Functions and Abstract Classes. After which the questions are shifted to DSA part, in which I was asked about my favourite data structure for which I replied arrays. He then gave me a problem statement “You are given an array consisting of integers having duplicates. You need to find the sum of duplicates”. For example, if 7 occurs three times in the array, we have to add 7 two times to the duplicate_sum (that we need to print). I solved using unordered map. He gave some random inputs and it went right. He then asked about “how do you find the middle element in a single linked list”. I told him of using two-pointers approach. Then after he shifted to DBMS and SQL, I said I was not confident in that. He then changed the topic and asked questions from JavaScript, Computer Networks like difference between http and https. At the end he asked whether I had any doubts to which I asked about the challenges & difficulties he faced at Optum.

Technical test followed by technical interview .Technical test consisted of multiple choice question regarding aptitude and technical details. Technical test consisted of string related coding question followed by some general coding related terms