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Associate scientist Interview Questions

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Find the second largest element in a Binary Search Tree

16 Answers

find the right most element. If this is a right node with no children, return its parent. if this is not, return the largest element of its left child.

One addition is the situation where the tree has no right branch (root is largest). In this special case, it does not have a parent. So it's better to keep track of parent and current pointers, if different, the original method by the candidate works well, if the same (which means the root situation), find the largest of its left branch.

if (root == null || (!root.hasRightChild() ) { return null;} else return findSecondGreatest(root, root.getValue()); value findSecondGreatest(Node curr, value oldValue) { if(curr.hasRightChild()) { return (findSecondGreatest( curr.getRightChild(), curr.value)); } else return oldValue; }

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How would you test if survey responses were filled at random by certain individuals, as opposed to truthful selections?

5 Answers

You are compiling a report for user content uploaded every month and notice a spike in uploads in October. In particular, a spike in picture uploads. What might you think is the cause of this, and how would you test it?

3 Answers

How do you take millions of users with 100's of transactions each, amongst 10k's of products and group the users together in a meaningful segments?

3 Answers

How would you build and test a metric to compare two user's ranked lists of movie/tv show preferences?

3 Answers

What made you interested in this position and this field of work?

1 Answer

Why Regeneron? Are you prepared for a job or a career? What unique lab skills will you bring to the department?

1 Answer

The three data structure questions are: 1. the difference between linked list and array; 2. the difference between stack and queue; 3. describe hash table.

1 Answer

Describe past research and what you want to research in the future.

1 Answer

You're about to get on a plane to Seattle. You want to know if you should bring an umbrella. You call 3 random friends of yours who live there and ask each independently if it's raining. Each of your friends has a 2/3 chance of telling you the truth and a 1/3 chance of messing with you by lying. All 3 friends tell you that "Yes" it is raining. What is the probability that it's actually raining in Seattle?

38 Answers
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