Flipkart Interview | Set 3

Recently I appeared for Flipkart Interview. I would like to share my experience.

  • Round-1: Telephonic (45 mins)
    1. Given an array of n distinct integers sorted in ascending order. Find an index i s.t ar[i] = i. Return -1 if no such index exists. Note that integers in array can be negative.
    2. Design a stack which holds an integer value such that getMinimum() function should return the minimum element in the stack.
      FOLLOW UP: Implement popMin() function which would pop minimum element from the original stack. O(1) implementation was required.(Hint: Use LinkedList to implement stack and store address of minimum element node in min-stack)

    3. Print an organisational hierarchy.
      Naveen manages Satish
      Satish manages Anushree
      Satish manages Sandeep
      Gurinder manages Naveen



      Gurinder->Naveen
      Naveen->Satish
      Satish->Anushree,Sandeep
      Anushree->
      Sandeep->

  • Round-2: Telephonic (30 mins)
    • Given an array which is first strictly increasing and then strictly decreasing. Find an element in this array. Discussions on various approaches and their complexities.

    After these two rounds, I was called for Face-2-Face discussions in Bangalore. There I had 4 rounds.

  • Round-3: In-House Coding(1 Hour 45 mins)
    Write a running code in any language to implement the famous tic-tac-toe game.
    First, there was a discussion on various approaches and basic functions which would be required to implement the same. Then I was asked to code.
    I was given 1 hour 15 mins to code this. I had to design this game as per following:

    • Game has 3 modes: Human Vs Human, Human Vs Computer and Computer Vs Computer.
    • Initially start with a 3X3 grid, but it can be generalised to NXN grid. So don’t hardcode any variable.
    • Minimise Code Redundancy and try to make it as modular as possible.
    • Try to use abstraction and expose a lesser number of functions(APIs) to the outside world.
    • Try to cover maximum number of edge cases, like when to abort the game, draw condition, win condition, overwriting the existing value in grid etc)

    After I wrote running code for the same, I was told to explain my code and then run with some test cases. Then he asked me to mail the code.

  • Round-4: Data Structure and Problem Solving(1 Hour)
    1. Given a sorted and rotated array. Find an element in this array.(Famous Problem)
    2. This was an interesting problem. Given a set of intervals like 5-10, 15-20, 25-40, 30-45, 50-100. Find the ith smallest number in these intervals.
      Assume there are no duplicate numbers.

      e.g:  1st smallest number = 5
            6th smallest number = 10
            7th smallest number = 15 and so on. 

      I told him that we would first sort the interval on basis of starting numbers. Then merge overlapping intervals to get a set of non-overlapping intervals like 5-10, 15-20, 25-45, 50-100. Now we can find the ith smallest number after finding the appropriate interval.

      FOLLOW UP: He then modified this question to accomodate duplicate numbers also.

      Suppose we have intervals like 5-10, 8-12. 
      Then total numbers in these two intervals would be: {5,6,7,8,8,9,9,10,10,11,12} 
              So, 1st smallest number: 5
                  4th smallest number: 8
                  5th smallest number: 8 (here is the 
      change since now we have duplicate elements also) and so on. 
    3. Given a dictionary of 50,000 words. Given a phrase without spaces, add spaces to make it a proper sentence.
      e.g: input:  thequickbrownfoxjumpoverlazydog
          output: the quick brown fox jump over lazy dog

      FOLLOW UP Questions:

      1. Worst case complexity of finding a word in HASHMAP given we have ‘B’ buckets and total of 50,000 words. ( Ans: O(50,000/B) )
      2. Complexity of finding a word in TRIE. (Ans: O(Word Length) )
      3. Advantages of TRIE over HASHMAP and some similar discussion.
  • Round-5: Hiring Manager Round(45 mins)
    He asked me lots of questions regarding my current company projects.
    Questions:

    1. My role in current project.
    2. Most Challenging work in your company.
    3. What technologies you learnt last year? and several similar questions.
  • Round-6: HR Round (10 mins)
    • Common HR questions like why Flipkart, Why should we hire you etc.

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