Placement Papers - Microsoft

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Microsoft Interview Pattern (Page-1)

Posted By : Onkar Rating : +7, -4

Interview : Microsoft Interview Questions (Part - 1):


The following are actual questions from actual interviews conducted by Microsoft employees on the main campus. Microsoft Consultants are sometimes allowed to have a life, so questions asked of them during interviews don't really count and aren't listed.

The questions tend to follow some basic themes:
       
Riddles        
Algorithms        
Applications        
Thinkers        
Riddles          
Why     is a manhole cover round?
           
How     many cars are there in the USA? (A popular variant is "How many gas     stations are there in the USA?")
           
How     many manhole covers are there in the USA?
           
You've     got someone working for you for seven days and a gold bar to pay them. The     gold bar is segmented into seven connected pieces. You must give them a     piece of gold at the end of every day. If you are only allowed to make two     breaks in the gold bar, how do you pay your worker?
           
One     train leaves Los Angeles at 15mph heading for New York. Another train leaves     from New York at 20mph heading for Los Angeles on the same track. If a bird,     flying at 25mph, leaves from Los Angeles at the same time as the train and     flies back and forth between the two trains until they collide, how far will     the bird have traveled?          
Imagine     a disk spinning like a record player turn table. Half of the disk is black     and the other is white. Assume you have an unlimited number of color     sensors. How many sensors would you have to place around the disk to     determine the direction the disk is spinning? Where would they be placed?
   
    Imagine an analog clock set to 12 o'clock. Note that the hour and minute     hands overlap. How many times each day do both the hour and minute hands     overlap? How would you determine the exact times of the day that this     occurs?        
You     have two jars, 50 red marbles and 50 blue marbles. A jar will be picked at     random, and then a marble will be picked from the jar. Placing all of the     marbles in the jars, how can you maximize the chances of a red marble being     picked? What are the exact odds of getting a red marble using your scheme?        
Pairs     of primes separated by a single number are called prime pairs. Examples are     17 and 19. Prove that the number between a prime pair is always divisible by     6 (assuming both numbers in the pair are greater than 6). Now prove that     there are no 'prime triples.' There is a room with a door (closed) and three     light bulbs. Outside the room there are three switches, connected to the     bulbs. You may manipulate the switches as you wish, but once you open the     door you can't change them. Identify each switch with its bulb. Suppose you     had 8 billiard balls, and one of them was slightly heavier, but the only way     to tell was by putting it on a scale against another.
           
What's     the fewest number of times you'd have to use the scale to find the heavier     ball? Imagine you are standing in front of a mirror, facing it. Raise your
    left hand. Raise your right hand. Look at your reflection. When you raise     your left hand your reflection raises what appears to be his right hand. But     when you tilt your head up, your reflection does too, and does not appear to     tilt his/her head down. Why is it that the mirror appears to reverse left     and right, but not up and down?
           
You     have 4 jars of pills. Each pill is a certain weight, except for contaminated     pills contained in one jar, where each pill is weight + 1. How could you     tell which jar had the contaminated pills in just one measurement?
     
The SF Chronicle has a word game where all the letters are scrambled up and you have to figure out what the word is. Imagine that a scrambled word is 5 characters long:
       
How     many possible solutions are there?        
What     if we know which 5 letters are being used?        
Develop     an algorithm to solve the word.  
There are 4 women who want to cross a bridge. They all begin on the same side. You have 17 minutes to get all of them across to the other side. It is night. There is one flashlight. A maximum of two people can cross at one time. Any party who crosses, either 1 or 2 people, must have the flashlight with them. The flashlight must be walked back and forth, it cannot be thrown, etc. Each woman walks at a different speed. A pair must walk together at the rate of the slower woman's pace.

Woman 1: 1 minute to cross
Woman 2: 2 minutes to cross
Woman 3: 5 minutes to cross
Woman 4: 10 minutes to cross


For example if Woman 1 and Woman 4 walk across first, 10 minutes have elapsed when they get to the other side of the bridge. If Woman 4 then returns with the flashlight, a total of 20 minutes have passed and you have failed the mission. What is the order required to get all women across in 17 minutes? Now, what's the other way?
       
If     you had an infinite supply of water and a 5 quart and 3 quart pail, how     would you measure exactly 4 quarts? You have a bucket of jelly beans. Some     are red, some are blue, and some green. With your eyes closed, pick out 2 of     a like color. How many do you have to grab to be sure you have 2 of the     same? If you have two buckets, one with red paint and the other with blue     paint, and you take one cup from the blue bucket and poor it into the red     bucket. Then you take one cup from the red bucket and poor it into the blue     bucket. Which bucket has the highest ratio between red and blue?  

Prove it mathematically.
Algorithms
       
What's     the difference between a linked list and an array?
           
Implement     a linked list. Why did you pick the method you did?
           
Implement     an algorithm to sort a linked list. Why did you pick the method you did? Now     do it in O(n) time.
           
Describe     advantages and disadvantages of the various stock sorting algorithms.
           
Implement     an algorithm to reverse a linked list. Now do it without recursion.
           
Implement     an algorithm to insert a node into a circular linked list without traversing     it.
           
Implement     an algorithm to sort an array. Why did you pick the method you did?
           
Implement     an algorithm to do wild card string matching.
           
Implement     strstr() (or some other string library function).
           
Reverse     a string. Optimize for speed. Optimize for space.
           
Reverse     the words in a sentence, i.e. "My name is Chris" becomes     "Chris is name My." Optimize for speed. Optimize for space.
           
Find     a substring. Optimize for speed. Optimize for space.
           
Compare     two strings using O(n) time with constant space.
           
Suppose     you have an array of 1001 integers. The integers are in random order, but     you know each of the integers is between 1 and 1000 (inclusive). In     addition, each number appears only once in the array, except for one number,     which occurs twice. Assume that you can access each element of the array     only once.
           
Describe     an algorithm to find the repeated number. If you used auxiliary storage in     your algorithm, can you find an algorithm that does not require it?
           
Count     the number of set bits in a number. Now optimize for speed. Now optimize for     size.
           
Multiple     by 8 without using multiplication or addition. Now do the same with 7.
           
Add     numbers in base n (not any of the popular ones like 10, 16, 8 or 2
         
Write     routines to read and write a bounded buffer.
           
Write     routines to manage a heap using an existing array.
           
Implement     an algorithm to take an array and return one with only unique elements in     it.
           
Implement     an algorithm that takes two strings as input, and returns the intersection     of the two, with each letter represented at most once. Now speed it up.
    Now test it.
           
Implement     an algorithm to print out all files below a given root node.
           
Given     that you are receiving samples from an instrument at a constant rate, and     you have constant storage space, how would you design a storage algorithm     that would allow me to get a representative readout of data, no matter when     I looked at it? In other words, representative of the behavior of the system     to date.
           
How     would you find a cycle in a linked list?
           
Give     me an algorithm to shuffle a deck of cards, given that the cards are     stored in an array of ints.
           
The     following asm block performs a common math function, what is it?  

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