Hello all, Recently a contest was held on interviewbit named Codersbit.I am attaching the problems. Please help me with the problems, I was able to do few of them but not in the most optimal way.And the contest ended few days ago, so it's not cheating.

1.(https://imgur.com/gn8I33P) (https://imgur.com/Ik8iLJs)

2.(https://imgur.com/KOrRzc8) (https://imgur.com/k1MBeYq)

3.(https://imgur.com/69KNRNf)

4.(https://imgur.com/3IGFu87) (https://imgur.com/zoNJ2CM)

5.(https://imgur.com/VplmGqS)