2 questions on HACKERRANK in CPP/C, test with camera, there is one hour to answer the test, questions at the Easy-Medium level, one question to find which element is missing in the array

Online objective test and interview .online test was moderate and had trivial digital design questions. Interview had aptitude, digital design and MOSFET physics related questions. It was if moderate difficulty. Then few generic questions were asked from resume. I was asked to explain my projects as well