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Hi.For the online assessment test - Debugging , which programming languages code snippet I can expect?Thank you !

convert a number m to n with minimum operations. The operations allowed were -1 and *2.
For Eg : 4 and 6. Answer is 2.
1st operation : -1 -> 4-1 = 3.
2nd operation : * -> 3 * 2 =6.

How many Fibonacci numbers exists less than a given number n.Can you find a function in terms of n , to get the number of fibonacci number less than n.
Example : n = 6
Answer: 6 as (0, 1, 1, 2, 3, 5)

A delivery boy wants to deliver some items on his way from office to home. You need to find the optimized path he should take from office to home and deliver all his deliveries on his way.

It is 101 X 101 grid. Office, home , delivery points are represented via coordinated (x,y) where 0 <= x <= 100, 0 <= y <= 100.

distance between two points (x1, y1) and (x2,y2) is computed as |x1 - x2| + |y1 - y2|

You need to find the optimized path from office to home covering all delivery locations and return the optimized path length as output.

You will be given the input in the 2 lines

first line - N (no. of delivery locations)
second line - (x,y) coordinates of office, followed by home, followed by all N delivery locations.

3
0 0 100 100 20 30 50 50 70 70

output: The length of the optimized path taken.

For above input, the output is 200

Suppose you have ten million data in a array where each data should be 15 in length. Some of the data length changed somehow. How do you find out which data are distorted.

Counting the number of digits before and after the decimal point without using string ( using double data type).

interface RangeContainerFactory {
  /**
   * builds an immutable container optimized for range queries.
   * Data is expected to be 32k items or less.
   * The position in the “data” array represents the “id” for that instance
   * in question. For the “PayrollResult” example before, the “id” might be
   * the worker’s employee number, the data value is the corresponding
   * net pay. E.g, data[5]=2000 means that employee #6 has net pay of 2000.
   */
  	RangeContainer createContainer(long[] data) 
}
/**
 * a specialized container of records optimized for efficient range queries
 * on an attribute of the data.
 */
interface RangeContainer {
/**
* @return the Ids of all instances found in the container that
* have data value between fromValue and toValue with optional
* inclusivity. The ids should be returned in ascending order when retrieved
* using nextId().
*/

	Ids findIdsInRange(longfromValue,
	long toValue,
	boolean fromInclusive, boolean toInclusive) 
}
/**
 * an iterator of Ids
 */
interface Ids { 

	/**
	* return the next id in sequence, -1 if at end of data.
	* The ids should be in sorted order (from lower to higher) to facilitate * the query 		distribution into multiple containers.
	*/
	static final shortEND_OF_IDS = -1 
	short nextId()  

}

Validation:
Your implementation should pass the following simple JUnit test before you start tuning for performance with volume data:

public class RangeQueryBasicTest {
  private  RangeContainer rc 
  @Before
  public void setUp(){
	    RangeContainerFactory rf = new YourRangeContainerFactory() 
	rc = rf.createContainer(new long[]{10,12,17,21,2,15,16})  }
  
	@Test
  	public void runARangeQuery(){
	Ids ids = rc.findIdsInRange(14, 17, true, true)  assertEquals(2, ids.nextId()) 
	assertEquals(5, ids.nextId()) 
	assertEquals(6, ids.nextId())  assertEquals(Ids.END_OF_IDS, ids.nextId()) 
	ids = rc.findIdsInRange(14, 17, true, false)  assertEquals(5, ids.nextId())  			assertEquals(6, 	ids.nextId())  assertEquals(Ids.END_OF_IDS, ids.nextId()) 
	ids = rc.findIdsInRange(20, Long.MAX_VALUE, false, true)  assertEquals(3, 		ids.nextId())  assertEquals(Ids.END_OF_IDS, ids.nextId()) 
} }




FAQ
Can't we just use a B-Tree/ NavigableMap/HashTable/BinarySearch/Lucene...
Sure, if you want. But there are a number of things we'd like to achieve:
● The container will be in memory and will need to hold lots of data, so we'd like it to be as space
efficient as possible, but not to the extent where speed is significantly compromised. Speed is
king, memory/disk can be purchased.
● Since we hate collecting garbage, we need to be careful about memory allocation during a query, as
my grandmother told me, "allocate not, gc not".
● Code should be clear and understandable.
● The rough order of trade off to consider for this case is: search performance, efficient
usage of memory, simplicity and maintainability of the code
These objectives are often at odds - we'd like to explore what's possible.

Two files are there file1.txt, file2.txt - both have some random names.

Like,
file1.txt file2.txt
---------- -----------
Raja Uthaya
Antony Karthi
Christopher Raja
Manickam Antony
Veeramani

Assume file1.txt can have more names(whole database of names), file2.txt has some selected names

You have to display what are all the mismatching items from file1.txt

Need efficient algorithm to do this

Given string say ABCGRETCABCG and substring length let us take length as 3, find the count of possible substrings, for example in above string ABC => 2 and BCG => 2 , where CGR and other 3 word length substrings has a count of 1.

Given a set of numbers find if a triplet can form a triangle a+b > c , b+c > a and c+a > b. The result to display all possible combinations of triplets. [ 10 5 3 4 7 1] [5,3,4 ] is one possible triplet and there can be many more.

A frog has to cross the river from one end to another end. river has stones in between randomly where frog can jump. frog can't jump into the river. problem is that will frog ever reach other end with following conditions?
1. frog allow to do same jump as previous jump. or
2. frog allow to jump 1 more as previous jump. or
3. frog allow to jump 1 less as previous jump.

consider river as Boolean Array. Stone is a element in array where value is true .

Array with distinct elements is given to you. write an API to return max selected ZIG ZAG array length.

Zig Zag array can start with either '<' or '>'. Below two are valid Zig Zag arrays.
a<b>c<d>e<f

x>y<z<l>k

Note: you may need to skip some elements while selecting Max Zig Zag array. But you should not change array order(swapping and sorting not allowed).
-----------
Zig Zag array examples
Test Case1:
I/P : { 1,42,59,43,68,44 };
O/P: return 5 (Selected ZIG ZAG array 1 < 42 > 43< 68 > 44)
Test case2:
I/P: { 100,42,54,2,5 };
O/P: return 5 (slected ZIg Zag array 100> 42 <54>2 < 5)
Test case 3:
I/P: { 1,42,54,20,1 };
O/P: return 3 {slected Zig zag array 1<42>20}

Given a string of numbers separated by spaces figure out whether or not you can arrive at 42 with the numbers using only addition, subtraction, and multiplication using java or javascript

Design auto complete for booking.com

Write a function to test if the given set of brackets are balanced or not. e.g. {{}}{)([][]

Given a random string S and another string T with unique elements, find the minimum consecutive sub-string of S such that it contains all the elements in T.
example:
S='adobecodebanc'
T='abc'
answer='banc'

Count the Mines Problem:

Your program will first read an integer N from stdin.
Then it will then read N lines of N integers separated by spaces.
Each integer in this Grid will be either 1 or 0.

The program then outputs an N x N Grid where each Grid element represents the number of 1's surrounding that element, (excluding the element itself).

For (column, row) = (0, 0), surrounding element indices are (0,1) (1,0) and (1,1).
Similarly for (1,1), surrounding element indices are (0,0) (0,1) (0,2) (1,0) (1,2) (2,0) (2,1) and (2,2).

Constraints:

Your output lines should not have any trailing or leading white space
Maximum Dimension of Grid = 1000 x 1000

Example Input:

"3 0 1 0 0 0 0 1 0 0"

Expected output:

1 0 1

2 2 1

0 1 0

add 2 huge numbers represented by linked list. Each linked list element represents a 4 digit number:

linked list1 : 8798 -> 8765 -> 1243 -> 9856 -> 8888 -> 0914
linked list 2: 8710 -> 5634 -> 1276 -> 8123 -> 1354 -> 9876

output: ................-> ............. ..-> 7980->0243 -> 0790

difference between shared tree and source specific tree in multicast

write a program to validate a IPV4 address

Given an array of positive, unique, increasingly sorted numbers A, e.g. A = [1, 2, 3, 5, 6, 8, 9, 11, 12, 13]. Given a positive value K, e.g. K = 3. Output all pairs in A that differ exactly by K.
e.g. 2, 5
3, 6
5, 8
6, 9
8, 11
9, 12
what is the runtime for your code?

Design Live comments. If your facebook.com homepage is open with bunch of feeds and if someone comments on those feeds, the comments should automatically show up in facebook.com home page without refreshing the page. Feeds could be a simple status update by a friend, post in a group, post by a person you're following, post in a page you've liked etc.

Few things what they are looking for -
1. How do you solve it initially and how do you scale it?
2. How do you scale push model in-case if you choose PUSH model to solve it?
3. If push cannot scale how do you solve it?
4. How pull model solves it?
5. When will you use push vs pull?

Hadoop architecture:
How would you deisgn a Craiglist based architecture ?
What hadoop components you would use. Given the user can search for a car and the car listings get updated frequently. How would you design the craglist system. What database you would use and how would you process the data ?

3. Implement a function that returns the i-th most popular item sold at Amazon. You cannot rely on any libraries.

class Item {
String itemId;
int quantitySold;
}

/**
* Find the ith most popular item in the list.
*/
String find(List<Item> items, int i) {
// your code goes here
}

2. Suppose you are given a puzzle that is represented as a matrix with 0s and 1s, where a 0 indicates you’re allowed to move into that position and 1 means you’re not allowed to move in that position. Write a function that given a start position and an end position, returns a boolean value indicating if there exists a path from start to end. You are only allowed to move up, down, right or left. Diagonal movement is not allowed.

Example #1

Input
0 0 1 0 1
0 0 0 0 0
0 1 1 1 1
0 1 1 0 0

start: 4,1
end: 0,3

Output
true

Example #2

Input
0 0 1 1 1
0 1 0 0 0
1 1 1 1 1
0 0 0 0 1

start: 0,0
end: 1,2

Output
false

Example #3

Input
0 0 1 1 1
0 1 0 0 0
0 1 1 1 1

start: 0,0
end: 2,1

Output
False

class Position {
final int x, y;
public Position(final int x, final int y) {
this.x = x;
this.y = y;
}
}

boolean pathExists(int[][] puzzle, Position start, Position end) {
// your code goes here
}

1. Write a function that removes the duplicate of a collection of numbers and returns the number of elements remaining in the collection after the duplicates have been removed. You must ensure that duplicates are actually removed from the list.

Example #1

Input
{1, 1, 5, 3, 8, 3, 7, 32, 32}

Output
6

Example #2

Input
{21, 10, 24, 2, 21}

Output
4

int removeDuplicates(List numbers) {
// your code goes here
}

Problem:
8 balls, where 7 have equal weight, one does not. Find minimum times to use a scale to find ball that is not equal weight.

Interviewer answer: weight 6 balls. Choose balls from lighter side. Total two attempts. This is the average case but not the best case.

This is not true in all cases and the interviewer did not see this...

Best case:
Pick two balls. One may weight less, so the lighter ball is found with one attempt. This is the best case.

Worst case: If first two balls are equal, weight 6 balls. Choose balls from lighter side. Weight again. Total three attempts.

Given a string which only contains lowercase. You need delete the repeated letters only leave one, and try to make the lexicographical order of new string is smallest.
i.e:
bcabc
You need delete 1 'b' and 1 'c', so you delete the first 'b' and first 'c', the new string will be abc which is smallest.

ps: If you try to use greedy algorithm to solve this problem, you must sure that you could pass this case:
cbacdcbc. answer is acdb not adcb

I can't solve this problem well and the interviewer said that you can scan the string twice. First scan is do some preprocess, and the second is to get the answer, but I really can't come up this idea.

You are given a list of n float numbers x_1, x_2, x_3, ... x_n, where x_i > 0.
A traveler starts at point (0, 0) and moves x_1 metres to the north, then x_2 metres to the west, x_3 to the south, x_4 to the east and so on (after each move his direction changes counter-clockwise)
Write an single-pass algorithm that uses O(1) memory to determine, if the travelers path crosses itself, or not (i.e. if it's self-intersecting)
e.g.
2 1 1 2 -> crosses
1 2 3 4 -> doesn't cross

You have given an array and you want to find an integer k so that the sum of the distances from k to each of the n integers is minimized. Define distance between two integers a and b as |a−b|3.