[slt2021]

you can always ask interviewer - define invert what does it mean - and interviewer in 100% cases will explain and even provide test cases.

in fact any candidate that doesnt ask clarifying questions and goes deep into coding right away - has a chance of going into wrong direction and is flagged as red flag.

As an interviewer I always lookout for candidates that dont ask questions, dont start with test cases, assume in their mind what is their understanding of ideal solution - and start coding. These are very inexperienced people who do that