Domande di colloquio per Developer Java Python presso Fivetran

First round coding on Java Basic questions, not at all difficult, just wanted to check OOPS concept. Second round : Skype interview Gave me three option to choose among A) data structure B) graph theory C) core computers I choose DS, So there was a real time coding round called as code pair. 1 question related to subarray and pointer stuff. Difficulty level : Mid Range