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How can you read last 10 lines of a big file and a follow up question was how would you extend this process optimally to read last 10 lines of 1000s of files?

Use synchronized, wait() and notify() to write a program such that below mentioned conditions are fulfilled while reading and writing data to a shared resource.

When a write is happening, no read or other write should be allowed(read and write threads should wait)

When a read is happening, no write should be allowed (write threads should wait) but. other read threads should be able to read.

Donot use any API classes e.g. ReadWriteLock, AtomicInteger etc..

I was asked to integrate linkedIn and dropbox. So linkedIn is not into file storage system, hence they want to use the services of dropbox. The goal is to create, update, delete the documents of a profile in linkedIn. But these documents will not be stored in linkedIn. They will be stored in dropbox.
Moreover, to get this integration, linkedIn does not want to scale up they system. This means, if they have 400 servers, they do not want to add any more servers to achieve the integration.
How can I design this?

Has anyone interviewed with Microsoft, Fargo North Dakota? Care to share the experience and some interview questions?

Hi,

could you please advise how to land a job in Microsoft. I have applied for many openings through LinkedIn but not getting contacted from Microsoft recruiters or have received any updates yet.

Thanks
Deepa

Given a list of sorted lists each of size maximum size M, implement an iterator (maintain the order of items as in the original list of lists).

I had a solution requiring extra space using minHeap; However, the interviewer was looking for a constant space solution.

Let's assume we have a queue named 'Demo' which receives messages from various users.

Create a Listener which will listen to the queue 'Demo' continuously and as soon as the message is send to the queue the Listener will print out the message.

The queue is running on port : 8161
Username : admin
Password : admin

Explain the difference between ORM and JDBC.
Provide some examples and when to use one over the other.

There are n number of stones. Each stone has a weight associated with it. 1st stone’s weight is 1, 2nd stone’s weight is 2.. and so on. You are given an integer x. You need to pick the maximum number of stones such that the total weight of stones picked is less than x.
You’re also given an array of stones which you can not pick.?

You are given a set of functions:

int open_port();
opens a serial port and returns 0 if everything ok (or -1 if error)

int read_port(char *buf, int buf_size)
which reads data from a serial port and stores it to 'buf' of size 'buf_size' or blocks until the data is available and returns the number of bytes read (or -1 if error occurred)

void close_port();
closes a serial port connection

Design a class:

class SerialConnection {
public:
     using ByteHook = std::function<void(char)>;

     SerialConnection(ByteHook callback);
....    
};

which should read data from the serial port asynchronously and send it to the callback function ByteHook byte by byte (e.g., for decoding).

Note that if you don't call 'read_port' often enough, the underlying system buffer might get full and some bytes will get lost..

Which data structures / sync primitives you are going to use ?

Question : Given a set of N numbers [1,N], partition them into 2 disjoint subsets based on a set of K queries.
Each query is of the type (n1, n2) where n1 and n2 are distinct numbers from the set and n1 and n2
belong to opposite subsets.

Example:

Input:

Input:
N = 4
K = [(1, 2), (1, 3), (2, 4)]

Output:
Set 1 : (1,4)
Set 2 : (2,3)

I don't remember perfectly the question, but it was like this


Given a list of 100 songs on your cell phone, find a way for each user to hear the songs without repeating songs, you need to use an algorithm that uses shuffle for songs.

Did any one took Microsoft Online Technical Screen ?? What questions I can expect in this test ??

Given a wall, which is made up of two types of bricks (Porus / opaque ). Porus bricks allow water pass through them. Opaque won't. Find whether water reaches to ground, if there is any rainfall.
Water can flow from top to bottom, diagonally, horizontally as well. Only flowing from bottom to top is not possible.

Give an positive integer n, find out the smallest integer m, such that all digits in m multiply equals to n. For example, n = 36, return 49. n = 72, return 89. You can assume there is no overflow.

Find Duplicate number from a huge amount of data which cannot fit in the memory.

Find kth-largest number from a huge amount of data which cannot fit in the memory.

We have an array if 0's and 1's like

00010000010001001

Assume that all 1's are a person and if a new person comes and if we want to add to the array in such a way that the gap between individuals are maximum as possible.

if we add a new person, then the new array should be

000100100010001001

Evaluate infix expression: 2 + 3 * 5

Interleave two singly linked lists into one.

LL1: 1 -> 2 -> 3 -> 4
LL2: 10 -> 20 -> 30 -> 40 ->50

Output LL1: 1-> 10 -> 2 -> 20 -> 3 -> 30 -> 4.
Note: Stop when we hit null for LL1.

You need to design a new YouTube feature where userA is uploading a video and userB (friend of userA) gets notified for the video and wants to watch the same video in real time (i.e. even the video is not completely uploaded but we want to enable the other user to watch it).
How would you tackle the situation when userB wants to view the content starting from a position which is not yet uploaded.

Draw block diagram for this problem identifying the different components.

Design calculator and related class, which returns result of the given expression, e.g if input is (3* 3) + 2 it returns 11.

Identify different OOPS classes and how would you call them.

A bus has to travel from A to B and the distance is d miles. There are many gas stations between A and B.
The bus has initially g gallon of gas in tank. 1 gallon of gas travels 1 mile.
Gas stations have inforamtion of remaining distance from station to destination b and max gas that can be filled from the station.
Find the minimum number of stops for bus without running out of gas ever.

eg: gas = 10 , distance = 20
gasStation[] = {{16,3}, {10, 7}, {14, 11},{11, 5}, {7, 6}}

o/p = 1
If bus stops at the stop{14,11} that is 14 miles away from destination and fills 11 gallon then it can reach destination with 1 gallon spare.
It can also stop as {16,3} and {10,7} but its 2 stops and at destination it runs out of gas.
Similarly {11, 5}, {7, 6} has 2 stops but has 1 gallon spare at destination.

Write a word processor that can do left and right justification for a sample input of string type.

Here is an example:
This is a sample.This is a sample.This is a sample.
This is a sample.This is a sample.This is a sample.This is a sample.

Additional details:
* The left margin is 5 units.
* The right margin is 75 units.
* The input string is a single-spaced collection of words and punctuation.
* If the length of the word exceeds the right margin, then we must not break the word. Instead, we must print it on the next line and justify the existing line by adding more spaces to the middle of the line.

Given a 3x3 tic-tac-toe board with players 1 and 2. Find all the possible ways player 1 can lose given a particular configuration of the board.

For example (0 denotes empty spot):
input:
0, 1, 0
2, 2, 1
1, 1, 2

Output: 1 (because the only move for player 2 to win would be to play board[0,0])

The input board can have any configuration (player 1 and 2 can be in all possible spots with any number).

Design a data structure which reads below block of text

*Status update1
**Joe is working on a bug
**Alice is on vacation
*StatusUpdate2
**Alex finished task1

and returns me an Object such that I can navigate the this nested text easily like this:

obj.children[0] - > returns "StatusUpdate"
obj.children[0].children[1] -> "Alice is on vacation"

Given a Tree where each node contains an attribute say color(R,G,B... etc). find subtree with maximum number of attributes.
Input:
G
/ \
B R
/ \ / \
B B R R
/ \ / \
B R R R

Output:

Input:
R
/ \
R R
\ / \
R R R

The best project you have worked till now.

Convert an Integer to a String.
eg 10--->"10",
2.5--->"2.5"
+10--->"+10"
-10----->"-10"
1.25e-7--->0.000000125

Given n line segments, find if any two segments intersect
http://www.geeksforgeeks.org/given-a-set-of-line-segments-find-if-any-two-segments-intersect/