I strongly recommend not to waste time and energy by interviewing for this company. I don't understand how they can expect a person to solve fully working (I mean it should be fully compiling) three long and medium level questions in 45 minutes in their karat screening interview. Let me give you more insight if you can provide the proper approach of the third question and wrote code as well but didn't get time to compile the same; then, they will not consider your third question at all. Also, the karat interviewers follow a strict procedure:- 1) Write the code. 2) After writing, compile it and then fix the compilation Errors. 3) Run-on some test cases. 4) Tell Time Complexity and Space Complexity. (you are not allowed to tell the complexities before completing the 2nd step as they mention they only consider it after the 2nd Step. Generally, any good company will ask you in the starting once you tell them your approach.) It's a one-sided interview where the interviewer doesn't care about the optimized solution. They don't interact, as well. So, focus on solving maximum questions as possible without interacting at all as they don't care about anything else except your three fully working codes (Above three steps).