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Microsoft Technical Aptitude Paper

Posted on :03-02-2016
MICROSOFT PLACEMENT PAPER (TECHNICAL-C, DATA STRUCTURE):-

Q1. Besides communication cost, what is the other source of inefficiency in RPC? 

ANS: Context switches, excessive buffer copying. 

Q2. How can you optimize the communication? 

ANS: communicate through shared memory on same machine, bypassing the kernel _ A Univ. of Wash. thesis

Q3. Write a routine that prints out a 2-D array in spiral order!

Q4. How is the readers-writers problem solved? - using semaphores/ada .. etc.

Q5. Ways of optimizing symbol table storage in compilers.

Q6. A walk-through through the symbol table functions, lookup() implementation etc. - The interviewer was on the Microsoft C team.

Q7. A version of the "There are three persons X Y Z, one of which always lies".. etc..

Q8. There are 3 ants at 3 corners of a triangle, they randomly start moving towards another corner.. what is the probability that they dont collide.

Q9. Write an efficient algorithm and C code to shuffle a pack of cards.. this one was a feedback process until we came up with one with no extra storage.

Q10. The if (x == 0) y = 0 etc..

Q11. Some more bit wise optimization at assembly level

Q12. Some general questions on Lex, Yacc etc.

Q13. Given an array t[100] which contains numbers between 1..99. Return the duplicated value. Try both O(n) and O(n-square).

Q14. Given an array of characters. How would you reverse it. ? How would you reverse it without using indexing in the array.


Q15. Given a sequence of characters. How will you convert the lower case characters to upper case characters. ( Try using bit vector - solutions given in the C lib -typec.h)

Q16. Fundamentals of RPC.

Q17. Given a linked list which is sorted. How will u insert in sorted way.

Q18. Given a linked list How will you reverse it.

Q19. Give a good data structure for having n queues ( n not fixed) in a finite memory segment. You can have some data-structure separate for each queue. Try to use at least 90% of the memory space.

Q20. Do a breadth first traversal of a tree.

Q21. Write code for reversing a linked list.

Q22. Write, efficient code for extracting unique elements from a sorted list of array. e.g. (1, 1, 3, 3, 3, 5, 5, 5, 9, 9, 9, 9) -> (1, 3, 5, 9).

Q23. Given an array of integers, find the contiguous sub-array with the largest sum.

ANS: Can be done in O(n) time and O(1) extra space. Scan array from 1 to n. Remember the best sub-array seen so far and the best sub-array ending in i.


  
   






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