Even after solving the questions correctly in an optimized way & explaining it to the panel, I received a rejection email. Recruiter did not even provide a reason why I was rejected even though the solutions were correct & passed all the test cases from the panel. My best guess is that the panel expected specific solution to the LPS problem (which they knew) & my solution was different (but still worked with the same Time & Space complexity) than his/her expectation. Do not waste time with this organization.