Tripadvisor Software Engineer Intern interview questions

Two phone interviews covering: 1. Find and remove all numeric characters in a singly linked list 2. Questions about basic data structures, trade offs, use case, access complexities 3. Given string A, B, return string A - (A intersect B) 4. implement basic hash table and collision handling 5. Discuss algorithmic complexity of solutions in all cases

I applied for this company on our campus career fair, and in the next few days they scheduled me an on-campus interview. One person interviewed me for about 45 minutes. Only technical questions, didn't ask me about my project or something else. He asked me to write code in a white board and then asked me some question about the code.He also told me there would be 3 rounds of interviews. Then I received an email telling me I passed the interview and then came up the 2nd round - telephone interview. It's a 30-minute interview asking a quite simple question and some extensions. Then he started to introduce the job and environment of their company. And after maybe 2 weeks, there will be an on-site interview if you pass the previous one.