From retail to finance to medicine, every industry needs interns to provide additional support and assistance. Interview questions will vary greatly depending on the industry and role you are looking for. Expect to answer questions about how you work on teams and provide examples of any relevant work experience. To ace your interview, make sure to research the particular position you are applying for.
pros and cons of hashtable (very easy, the purpose of this question is only to let me feel not that embarrased)
O(1) insertion, visit, deletion, etc collision, time to build up the table, extra space cost