First question: Given an Excel table as a string so that each column is separated by a comma, and each row in \ n And another column name, should return the maximum number in that column Second question: Given a set of dates and a set of expenses or withdrawals accordingly, the final amount should be refunded at the end of the year, so that is the sum of everything plus a credit card fee, if more than three withdrawals have been made for a total of one hundred shekels do not have to pay, if not pay Five shekels for that month Third question: you have a plane that needs to arrange families of four people, some of the seats are occupied and you need to arrange as many families as possible, the places are arranged as follows: _ _ _ _ _ _ _ _ _ _ - The family is allowed to sit or together in a quartet or two in a quartet and two more next to them in a trio, not three in a trio and the fourth in a quartet ...

design a rate limititer for api