A problem can be solved by using heap. You must now how to extract min/max from the heap, how to delete or update an element in the heap.
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Serialization/ deserialization
Bit operations.
The second question was a bit confusing. Suppose you have a facebook API, which allows you to access all one's friends. Can you find if B is connect to A through friend's network? say A has friends (C,D,E) and C has friends(B,G). Now A is connected to B. I did the second one with a 7 layer for loop first, 'cause I was avoiding overloading the memory with too much data. However, the interviewer seems not to appreciate that. But I did answer the following up question wrong. He asked what is the big O for my code. A map search is N(nodes)+V(edge). I did not know that, I gave a answer of N, which is close but not correct.
both were string manupulation questions
Various types of questions covering object oriented programming, dynamic programming and basic functional programming.
I agreed not to disclose any specific questions, but questions available on Top Coder and similar websites are very comparable.
What is your main research focus? Talk about your past project.
Why do you want to work at doordash?
I signed an NDA :(
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