## Facebook Placement Papers

Facebook Interview Questions Set 5

Facebook Interview Questions Set 4

Facebook Interview Questions Set 2

Facebook Interview Questions Set 1

Facebook interview Questions for Software Engineer

Facebook Tough Interview questions

## Placement Papers for All Companies

3i infotech

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BMC

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C-DOT

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CMS

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Emphasis

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KPIT

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Maruti

Matrix

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McAfee

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MKCL

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Ness Technologies

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Novell

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Persistent

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Robert Bosch

RS Software

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Schneider India

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SQL Star

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Syntel

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Tata-ELXSI

TCE

TCS

Tech Mahindra

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Thermax

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Triad

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TVS Motor

Unisys

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Valuelabs

Vedanta

Verifone

Verizon

Virtusa

Vision Infotech

Vizual

VMware

Wipro

Yahoo

YASH Technologies

Zenith

Zensar Technologies

ZTE

# Facebook Interview Questions Set 3

Posted on :12-03-2016

**Q1. A robot has to move in a grid which is in the form of a matrix. It can go to**

**1.) A(i,j)--> A(i+j,j) (Down)**

**2.) A(i,j)--> A(i,i+j) (Right)**

**Given it starts at (1,1) and it has to go to A(m,n), find the minimum number of STEPS it has to take to get to (m,n) and write**

**public static int minSteps(int m,int n)**

**For instance to go from (1,1) to m=3 and n=2 it has to take (1, 1) -> (1, 2) -> (3, 2) i.e. 2 steps**

**Q2. Given an m x n matrix where each row element is sorted, but the columns do not appear in sorted order, write a function to print each matrix element in sorted order.**

Example matrix:

matrix = [

[20, 40, 80],

[5, 60, 90],

[45, 50, 55]

]

Your function should print 5, 20, 40, 45, 50, 55, 60, 80, 90.

Add on: Assume that we are space-constrained such that we can only hold one row in memory at a time. Optimize your function to work under such constraints as efficiently as possible.

**Q3. Given a sequence of positive integers A and an integer T, return whether there is a continuous sequence of A that sums up to exactly T**

**Example**

**[23, 5, 4, 7, 2, 11], 20. Return True because 7 + 2 + 11 = 20**

**[1, 3, 5, 23, 2], 8. Return True because 3 + 5 = 8**

**[1, 3, 5, 23, 2], 7 Return False because no sequence in this array adds up to 7**

**Q4. Given a string containing letter, digit, and other characters, write a function to check palindrome for only letter and digit. The implementation need to be in-place, no extra memory is allowed to create another string or array.**

**For example:**

**"ABA" is palindrome**

**"A!#A" is palindrome**

**"A man, a plan, a canal, Panama!" is palindrome**

**Q5. Write a program that answers YES/NO search queries containing * placeholders. Example: if the data you have is (hazem, ahmed, moustafa, fizo), then you should answer as follows for:**

**ahmed: YES**

**m**stafa: YES**

**fizoo: NO**

**fizd: NO**

**: YES**

**: YES**

**NO**

**Your program should be able to answer each search query in O(1).**

**Q6. Input: A string equation that contains numbers, + and ***

__Output__: Result as int.

**For example:**

**Input: 3*5+8 (as String)**

**Output: 23 (as int)**

**Q7. Given a class Range**

**class Range {**

**public int begin;**

**public int end;**

**public Range(int begin, int end) {**

**this.begin = begin;**

**this.end = end;**

**}**

**}**

**The problem:**

**Intput:**

**1) list of Ranges that dont overlap (not sorted)**

**2) newRange that might overlap.**

__Output__:**list of merged Ranges**

__For example:__Input: [1..5] [9..13] [17..22]

new Range: [4..10]

Output: [1..13] [17..22]

**Q8. Convert a binary tree into a In Order traversal circular list re-purposing the nodes pointers Left & Right as Previous and Next respectively.**

Hint: A single node Left & Right points to itself.

Note: This is not a binary search tree.

**Q9. You are given a set of unique characters and a string.**

**Find the smallest sub string of the string containing all the characters in the set.**

**ex:**

**Set : [a, b, c]**

**String : "abbcbcba"**

**Result: "cba"**

**Q10. First they did ask to find pattern of this**

**this is a test sentence => [t, h, i, s, i, s, a, t, e, s, t, s, e, n, t, e, n, c, e]**

**thiis iss a teest seentennce => [i, s, e, e, n]**

**thiiis iss aa teeest seentennnce => [i, e, n]**

**thiiiis iss a teeest seeentennncccce => [i, c]**

**after i have to do body of function**

**getLongestConsecutiveChar**

**Q11. Completely blew it on this question today.**

**1.) Given an array, find the maximum difference between two array elements given the second element comes after the first.**

__For example.__**array = [1,2,3,4,5,6,7]**

**We can take the difference between 2 and 1 (2-1), but not the different between 1 and 2 (1-2).**

**Q12. It started with simple behavioral questions like, why facebook, cultural fit questions etc. They asked simple question.**

**You are at latest version of committed code. assume one branch of code. Code version is in sorted order.**

**It is corrupted with bug. You have fun isBug(VerNumber) which returns True or False. Find the version in which bug was introduced?**

**This can be solved with linearly checking each version or modified binary search. Person asked to write test cases? This is where i struggled. how do you write test case for this question? Do you guys use framework syntax or something else?**

**Q13. Inplace reverse a sentence**

**You given a sentence of english words and spaces between them.**

**Nothing crazy:**

**1) no double spaces**

**2) no empty words**

**3) no spaces at the ends of a sentence**

**void inplace_reverse(char* arr, int length) {**

**// your solution**

**}**

**Example:**

**input "I wish you a merry Christmas"**

**output "Christmas merry a you wish I"**

**Constrains: O(1) additional memory**

**Q14. The closest common ancestor in a tree forest.**

**class Node {**

**Node* parent; // == null for root of tree**

**Node* left;**

**Node* right;**

**}**

**Node* tree_forest[]; // array of pointers which points to roots of each tree respectively**

**Node* closest_common_ancestor(Node* n1, Node* n2) {**

**// your solution**

**}**

**Example:**

**| a | j**

**| / | /**

**| b c | h**

**| / / |**

**|d e f |**

**for e and d CCA is a**

**for e and f CCA is c**

**for e and c CCA is c**

**for h and d CCA is null**

**Constrains: O(1) additional memory**

**Q15. Design a URL system.**

**He even wanted to know what kind of algorithm to use, improve the speed, availability etc.**

**Q16. Given a 4 X 4 game slot that has random alphabets in all the slots**

**Write a function that takes the keyboard and the word as input and returns true if the word can be formed**

**False otherwise.**

A word can be formed on the board by connecting alphabets adjacent to each other (horizontal, vertical and diagonally)

Same alphabet should not be reused.

**Q17. Given a set of n people, find the celebrity.**

**Celebrity is a person who:**

**1. Knows only himself and no one else**

**2. Every one else knows this person**

**You are given the following helper function:**

**bool knows(i, j);**

**Returns:**

**True: If i knows j**

**False: otherwise**

I proposed the O(n2) algorithm at first but he wanted me to improve on it. He wanted an O(n) algorithm

**Q18. You have a list of words with ranking.**

**Now you need to create a function that will take this list as input and provide a way so that a T9 keyboard can provide three top results of probable words based on rankings for the numbers punched in.**

**Q19. Tree to List: convert a binary tree to a circular doubly-linked list**

**Q20. Roll two dice, what is the probability of rolling no sixes?**

**Q21. Given an array of integers, return true if therere 3 numbers adding up to zero (repetitions are allowed)**

**{10, -2, -1, 3} -> true**

**{10, -2, 1} -> true -2 + 1 +1 =0**

**Q22. Find the maximum number of non-intersecting events in a calendar.**

**Q23. Write a function to print the rows of a binary tree, terminating each row with a carriage return**

**Q24. Given a Tree:**

**A**

**/**

**B C**

**/ /**

**D E F G**

**Write a function that prints:**

**A**

**BC**

**DEFG**

**Q25. Given an array of ages (integers) sorted lowest to highest, output the number of occurrences for each age.**

**For instance:**

**[8,8,8,9,9,11,15,16,16,16]**

**should output something like:**

**8: 3**

**9: 2**

**11: 1**

**15: 1**

**16: 3**

**This should be done in less than O(n).**

**Q26. Print a BST such that it looks like a tree (with new lines and indentation, the way we see it in algorithms books).**

**Q27. Write a function that takes the following inputs and gives the following outputs.**

**Input: A list of points in 2-dimensional space, and an integer k**

**Output: The k input points closest to (5, 5), using Euclidean distance**

**Example:**

**Input: {(-2, -4), (0, 0), (10, 15), (5, 6), (7, 8), (-10, -30)}, k = 2**

__Output__: {(5, 6), (7, 8)}

**Q28. An efficient way to sort patient files in an array of just 3 types High-importance, Mid-importance, Low-importance which are in an arbitrary order (unsorted).**

__The output preference should start with the highest.__

**1. High-importance**

**2. Mid-importance**

**3. Low-importance**

**[high,low,low,med,high,low]**

**Q29. There is a list of rectangles and a list of points in a 2d space. Note that the edge of each rectangle are aligned to XY axis. question is how to find rectangles with point or points inside**

**- rjrush December 15, 2014 in United States | Report Duplicate | Fl**

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