Not able to do bit manipulation questions, help anyone? :c

I've been trying DP questions ( not enough in codeforces, but in leetcode ) and whenever I try to solve this question, I'm stuck at whether I should do it with 1d Array or 2d Array.

now now now, I know many of you are going to say solve more problems ( I agree ). Through this question, I just want to know perspective of someone who has done dozens of questions..

Thanks and Peace out :)