# Intern Interview Questions

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### Software Development Engineer Intern at Amazon.com

Feb 15, 2012
 “To find and return the common node of two linked lists merged into a 'Y' shape.”

### Quant Research Intern at Susquehanna International Group, LLP

Mar 17, 2013
 “Suppose you have two covariance matrices A and B. Is AB also a covariance matrix? Suppose that, by plain dumb luck, we also have that AB=BA. Is AB a covariance matrix under this additional...”

### Software Development Engineer Intern at Microsoft

Aug 13, 2013
 “Determine if an array from 1..n has a duplicate in constant time and space.”

### Trading Intern at Susquehanna International Group, LLP

Jan 8, 2012
 “I have 10 cards face-down numbered 1 through 10. We play a game in which you choose a card and I give you the corresponding dollar amount. a) What is the fair price of this game? b) Now, after...”

### Quantitative Researcher Summer Intern at Jane Street

Apr 17, 2011
 “3) Poker. 26 red, 26 black. Take one every time, you can choose to guess whether it’s red. You have only one chance. If you are right, you get 1 dollar. What’s the strategy? And what’s the expected...”

### Software Engineer Intern at Facebook

Oct 1, 2013
 “Given two strings representing integer numbers ("123" , "30") return a string representing the sum of the two numbers ("153")”

### Software Engineering Intern at Google

Oct 14, 2011
 “how would you find the shortest path between two nodes in a social network?”

### Software Engineer Intern at Facebook

Sep 21, 2011
 “Generate a new array from an array of numbers. Start from the beginning. Put the number of some number first, and then that number. For example, from array 1, 1, 2, 3, 3, 1 You should get...”

### Financial Software Developer Intern at Bloomberg L.P.

Apr 17, 2012
 “There are 20 floors in a building. If you're on an elevator and you're trying to get to the 20th floor, what is the probability that 4 people ahead of you click the 20th floor before you do? Assuming...”

### Intern at Google

Dec 30, 2011
 “Find occurrences of a number in sorted array (allow duplicates).”
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