Job Interview, Question Pattern Paper
Selection procedure and interview questions of Microsoft at Dhirubhai
Ambani Institute of Information and Communication Technology (DA-IICT)
- There were 4 rounds for selection procedure. First
- Round was a written test, second round was group interview and 3rd and 4th
rounds were technical interview. Each round had eliminations.
- Following is the detail about each round.
All examples which I will give here are just for your understanding.
Interviewer was not giving any examples. Hardly 2 – 3 time interviewer gave
Written testPaper style:
3 subjective questionsTime limit:
1½ hourQuestion 1:
Finding output....It was string cruncher program.
First remove all repeated consecutive substring
with length 1, then delete substring of length 2 and so on...Example :
string is “abcabeccced”
- After removing repeated substring of length 1: “abcababceccced” -->
“abcababceced” (2 'c' are removed)
- After removing repeated substring of length 2: “abcababceced” --> “abcabceced”
(substring “ab” is removed)
and so on...
Question 2: Writing a program.
Definition: You are given 3 integer arrays A, B and C of length n1, n2 and n3
respectively. All arrays are sorted. We define triplet of these 3 arrays as (x,y,z)
where x is any integer from A, y from B and z from C. We define distance of
triplet as maximum difference among triplet elements, i.e. Maximum of x – y, y –
z or z – x. Write a program to find minimum triplet distance. (means there are
n1*n2*n3 number of possible triplets are possible...among all triplets which
triplet has minimum distance...Give only distance, but not triplet elements).
Your program must be as much efficient as possible.
Question 3: Writing program.
Definition: You are given 2 integer numbers in linked list form. Add those 2
Example: First number is 234 and second number is 35. So, you are provided with
2 linked lists 2->3->4 and 3->5. Your answer must be 2->6->9. (Make sure to take
care of carry number). This example was given in paper.
Round 2: Group Interview
All candidates who had cleared the written test were called for group interview.
Here we were given 3 problems one by one. Time limit was between 15 to 20
minutes. Once they gave problem definition we were supposed to think on it and
discuss our ideas and logic about solving that problem with one of the
representatives from Microsoft. Once that representative was convinced with our
logic then we had to write code for that problem on paper.
You are given a string. Develop a function to remove duplicate
characters from that string. String could be of any length. Your algorithm must
be in space. If you wish you can use constant size extra space which is not
dependent any how on string size. Your algorithm must be of complexity of O(n).
Example: Given string is BANANAS. Output must be BANS. All repeated characters
Problem 2: You have a tree and address of its root. Write an efficient program
to test whether a given tree is Binary search Tree or not. (Hint: In-order
traversal of binary search tree is sorted in increasing order. Use this property
to develop program)
Problem 3: You have 2 sorted lists and a function that merge that 2 lists such
that output is again sorted and duplicates are removed. That means output is
union of those 2 lists in sorted form.
Example: First list is 2->3->5->6->8 and second list is 4->5->6->7 and output of
function is 2->3->4->5->6->7->8.
Develop test cases to test given function such that your test cases ensures that
given function works for every situation. That is if inputs are valid then it
gives proper output in any case or otherwise it shows error message.
Round 3: First Technical Interview
All those who had cleared group interview were called for first technical
interview. They were taking minimum 2 hours for first interview. Some of us also
faced interview for 3 or more hours.
Round 4: Second Technical Interview
All those who had cleared first technical interview were called for second
interview. This was last round of interview. They took 1½ to 2 hours for this
I don't remember all the questions which were asked to me in both interviews.
But still some of the questions which I can remember (almost 80 to 90%
questions) are listed below.
In both interview they ask questions from C/C++, java, OS, Data structure and
algorithms, Microprocessors and compiler constructions. With this, they also
asked me to develop more than 6 to 8 programs. You can develop all programs in 5
to 7 minutes. But after writing program they asked to find its complexity and
try to reduce the complexity and write the program again. In this way it took
almost 15 to 20 min for each program. Some took less than 15 minutes also.
Some of the interview questions are as follows:
You are given a linked list and block size k. Reverse block of size k from list.
For example you are given linked list of 1000 nodes and block size is 5 then
instead of reversing whole list, reverse first 5 elements, then 6 to 10
elements, then 11 to 15 elements, and so on...You have singly linked list and
your algorithm which you will implement must be in space, that is no extra space
You are given a tree and any 2 nodes of that tree. Find common parent of both
nodes. Develop as much efficient program as you can.
In unix there is a command called “tail”. Implement that command in C.
Some questions about race condition (OS)
Questions related to semaphores.
Questions related to mutex. Applications of mutex. How to implement mutex in OS?
Questions about Critical region (OS).
How to ensure that race condition doesn't occur. Give your view as you are OS
How to ensure that each process lock the critical region before they enter in
it. As OS designer How will you force the process to do this?
Questions on IPC
Questions on Shared memory and Message passing mechanism.
Difference between system call and API call
How system call works? What happens when system call is invoked?
Different types of system calls?
Some questions from microprocessor. About Interrupts
Types of Interrupts. What happened when interrupt is called? You are given a hard copy of a program which contains some errors. Your job is
to find all types of errors from it. And discuss why is it an error. Write
correct program for the same.
You are given a linked list and a number n. You also have a function to delete
all nodes from that list which are at position which multiple of n in the list.Example:
if number is 3 then delete 3rd, 6th, 9th ,...nodes form the list.
Develop a program that tests whether given function works properly or not. (In
short they are asking me to develop general program for all test cases. By
running that program all tests can be performed.)
- Questions on java. Exception handling
- Need of catch and finally block in java exception handling..
- How will you create your own exception.. Explain with example.
Some questions on compiler construction. What is parser? What is input to the
parser and what is output of parser? Difference between top down and bottom up
F(1) = 1.
F(2n) = F (n) and F(2n+1) = F(n) + F(n+1).
Develop recursive program.
You are given a string which contains some special characters. You also have set
of special characters. You are given other string (call it as pattern string).
Your job is to write a program to replace each special characters in given
string by pattern string. You are not allowed to create new resulting string.
You need to allocate some new memory to given existing string but constraint is
you can only allocate memory one time. Allocate memory exactly what you need not
more not less.
Assume that your friend is writing a book . He gives you a file that contains
that book. Your job is to develop an algorithm for indexing of that book. In
every book there is one index at end which contains some words which are not
there in normal vocabulary dictionary. It also contains page number for
reference. You can use any data structure you want. You need to justify why you
have used that data structure and also need to justify your logic.
Question from my B.E. final semester project. Asked me to explain whole project.
Question from everything written on my resume.
Question from my every project I did. They asked me to explain each project and
then how to do some modification? That modification will be suggested by
My experience in Teaching assistantship.
They had my written test answer sheet. They opened it and asked me to explain
why I gave that output or why I implement that logic. How did I arrive to that
solution which I had written in answer sheet.
In written test, for second question I had implement a program which was not
much efficient. During interview they ask me to optimize my program. They also
gave hint to optimize it.
During group interview, in second problem I was only able to discuss logic I was
unable to develop program in given time limit. Interviewer knew this. She asked
me to develop that program during interview.
Which is your favorite software tool? If you are allowed to add any feature in
it which feature you will add?
Which is your favorite subject? Some questions from that subject.
Something about yourself , your hobbies, interests, strengths and weakness.
Company Name: Microsoft
No of Rounds: Techincal Round-1
Location : Bangalore