Morgan Stanley Technology Analyst interview questions

Phone interview first. Q1: hash table Q2: reverse string Then get On-site: 1-Group interview 2-tech 1:1 interview Q1: Regular expressions Q2: analyze the math expressions with "'[{}]s (use stack) Q3: difference between dynamic and static programming languages Q4: reverse string 2 weeks after on-site, got an email from HR, asked if I was still interested and avliable. Answered yes, and no replies for two days. Then another follow-up mail, HR saids the final decision maker is "travelling" 2days later, HR emailed me asked for transcript. The day after, got the rejected.