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      Two Sigma

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      Two Sigma interviewsTwo Sigma Systems Developer interviewsTwo Sigma interview


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      Systems Developer Interview

      9 Aug 2012
      Anonymous interview candidate
      New York, NY
      No offer
      Positive experience
      Difficult interview

      Application

      I applied through a recruiter. The process took 1 day. I interviewed at Two Sigma (New York, NY)

      Interview

      Exceptional company, some of the most brilliant people work here. It began with a phone interview, where I was asked my background . Then they sent over a "coding test" that had 2 programming questions required to be done in 2 hours, I didnot find them very difficult. It has been put up here before, I got the same questions too. Then they invited me to new york, paid for the coach plane ticket, put me up in the soho grand hotel and reimbursed upto 30$ per meal. The in-person interview was exclusively hard algorithmic questions, specifically the two below.

      Interview questions [1]

      Question 1

      1. You have two strings. A test string and a glob Test string can have a & b, any number of times, any location. Glob can have a, b, ? and *, any number of times, any location. E.g. test= {a,b,a,a,a,a,b,b,b,b,b,b} glob = {a,?, *, b} Now, ? means ANY character, single occurrence. So it's either a or b, one time * means ANY OR NO character, any number of occurrences. E.g. the above glob and test actually match. Problem is: write an algorithm to match glob with test. You MAY NOT use regular expressions :D 2. The input is any string of any length of any characters. Write a program to generate ALL unique permutations of those characters. Unique. You may not store in an array or list, due to memory constraints. e.g. for input of abc your program should give 6 permutations but for aba your program should give 3. Hint: make the list alphabetical.
      3 Answers
      6