we are supposed to crete an array u which has the mentioned sequence in ascending order. for the return part, given input is an index and its supposed to return the element from that index in the array.
This is my understanding.
I'm able to run my solution in difference compiler (programmiz) and get correct output for all the mentioned tests, however it's getting timed out here

Thanks a lot for this comment. really helped me to find the issue after busting my head for hours.