does liberal arts means student are allowed to take any subject for undergraduate such as account, economics
,finance ,computer science?
First off, all of your questions can be answered by using Google. Please google “liberal arts” curriculum and read the definition. Then google “Harvard General education requirements.” If you think you are Harvard material, you need to demonstrate you have investigated these questions on your own, prior to posting a question.
Harvard has economics and computer science at the undergrad level. It does not have vocational majors like business or accounting.