Round 1(aptitude and coding) Two tests:
- Test 1 (50 mins)
45 questions on analytical reasoning, quantitative and geometry.
Analytical Reasoning Questions were tough, with lengthy and confusing statements.
- Test 2- (2 hrs 50 mins)
13 MCQs on OS, C, DS, OOP, Computer Architecture
7 coding questions, few of them I remember are:
- Reversing a linked list
- Check if the given sum is available in an array
- Row with a maximum number of ones in a matrix of 0s and 1s
- Balanced parenthesis
- Multiply two numbers without using * operator, and minimum number of additions
- Check if a number is a palindrome
About 18 people were shortlisted.
- Tech Interview Round 1:
Tech Interview Round 1:
- Asked me to implement a 2d bit-matrix representing monochrome pixels which will have only OFF/ON values and will take on an average only one bit of memory for each stored bit (Don’t declare an int matrix!), and how to perform various operations on it.
- Some problems on basic geometry – circles and tangents were given.
- C programs were given and various OS related issues were discussed regarding them, mainly addressing issues, address space, paging etc.
- If F() generates 0 or 1 with probability .5 each, generate 0-7 with equal probability.
- Some in-depth questions on pointers, dynamic memory allocation etc were asked.
- Tech Interview Round 2:
- Convex Hull problem
- given a set of points in a plane, how would you make the most optimized triangular mesh-each point is a vertex of a triangle.
- Intersection of two lines in a plane, if they intersect- determine the point of intersection.
- Design problem: without knowing the underlying data structure to store various entities, how would you extend the stl library of c++, which will support any type of queries. Basically he was interested in methods of indexing upon the data and retrieval of relevant information.
- Tech Interview Round 3:
This round was mostly a design round.
- Given two machines with different architectures and different endianness, how would you as a programmer make sure that user gets a uniform view of the various files stored. Now if one the files is transferred from one to another, how you’re going to maintain that view to the user?
- Implement the qsort() in c/sort() in c++ library or your own custom sort which will sort any type of data on user defined criteria. write the function prototype, definition and another requirements.
- How much memory is made available to a user program by the kernel, is there any limit to it? What is the range of addresses a user program can have at max, what determines it?What happens if excess memory is allocated to a user program, say malloc in an infinite loop?
- What is the difference between mutex and a semaphore. Write down a crude implementation of both. How would you solve the mutual exclusion problem using semaphore. Propose a solution to the readers-writer problem.
- Other OS related problems.
Last round was the HR round.
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