Facebook Technical Interview Questions to Crack the Coding Interview

Cracking technical interviews at FAANG companies is often seen as a daunting challenge even for experienced programmers. A popular opinion within the programming community is that Facebook has the toughest and most demanding interview-testing standards in the tech world.

For all you aspiring Facebookers, cracking the Facebook interview isn’t going to be clear sailing. By employing a dedicated and structured learning approach, however,  an offer from your favorite company can be well within reach.

Here's what this article entails:

1. Facebook Interview Questions on Data Structures, Systems Design and Algorithmic Coding

• 1.1 Technical and Coding Questions
• 1.2 Behavioral Questions

The Facebook coding interview tests candidates on a diverse set of skills, with the interview typically consisting of 3 rounds viz.

• The Phone-Screen
• Technical On-Site
• Behavioral Rounds. 
  

Technical questions asked are usually based on  common programming concepts such as Data Structures, Algorithms and Systems Design. 

These categories have equal representation in the interview, and candidates are required to solve complex coding problems by applying these concepts.  

In this article, we’ll look at the most commonly asked Facebook technical Interview Questions to crack the Facebook coding interview. 

Facebook Interview Questions on Data Structures, Systems Design and Algorithmic Coding

Technical and Coding Questions

1. Given two large strings A and B, multiply the strings and return the result “R” as a string. 
2. Write a program to add two binary strings A and B. 
3. Write a program function to check if a given Binary Tree “A” is a valid Binary Search Tree.
4. Write a code to find the longest increasing subsequence for an array of integers, “A”. 
5. For a given array “A” where the nth element is the price of a stock on the nth day of the month, write an algorithm to find the maximum profit during the month. 
6. For a given integer array “A” and an individual integer “K”, write a program to find the total number of subarrays where all elements are lesser than the value of integer K. 
7. For a given histogram where the largest rectangle can be formed by clubbing contiguous bars, write a program to find the largest area that can be formed. 
8. Write a program to find the minimum and maximum depth for a given Binary Tree “X”. 
9. Explain the different types of greedy algorithms and their core functions. 
10. For a given string containing integers and alphabets in random order, write a program to print all the alphabets in order followed by the product of all mentioned digits. 
11. For two separate Linked Lists representing two positive integers, if each of their nodes contain separate digits themselves, add the two numbers and return the result as a Linked List. 
12. For an Unordered Binary Tree with two given values, write a code to find the Lowest Common Ancestor.
13. Design a comprehensive Distributed Key Value Store that is tolerant to network partitions.
14. Explain the procedure to design a Web Search Engine. 
15. Explain the procedure to design a URL Shortener.
16. Explain why Greedy Algorithms are more efficient than Dynamic Programming in solving complex graphs problems. 
17. For a given dictionary that is represented by a grid MxN wherein every cell has a single character, write a code to get all possible words that can be constructed through a series of adjacent characters.
18. For a given set of integers read from a particular data stream, write a code to find the Median. 
19. Write a code to find out if a given string AB is a K-Palindrome or not. 
20. For a given array represented by a positive number, write a program to find the largest subset in the array where all the elements are numbers in the Fibonacci Sequence. 
21. For a given string “S”, write a program using Recursion to find out whether it contains an additive sequence. Note that a string must contain a minimum of 3 digits for it to possess an additive sequence.
22. What are Binary Trees and Slacks? Explain with examples.
23. Explain the steps involved to perform popular sorting techniques including Insertion Sort, Merge Sort, Quick Sort and Heap Sort. 
24. For “n” number of sorted arrays of varying sizes, write a program to find the mth smallest value in the newly merged array.
25. Write an algorithm to find the number of ways to travel “N” metres by doing jumps of 1,2,3,4 and 5 metres in length. 

Behavioral Questions

1. How do you stay motivated at work?
2. Tell us about the one project you’re particularly proud of.
3. How do you build relationships in a workplace?
4. Why do you think you should be hired at Facebook?
5. Are you aware of Facebook’s culture? If yes, describe it briefly.
6. Describe yourself from the lens of a coworker?
7. Tell us about a time when you had a disagreement with your superior.
8. How would you go about resolving conflict between two subordinates?
9. What do you think are the most important challenges Facebook will face in the coming years?
10. What was your biggest challenge in preparing for this role?
11. What is your opinion on vacations impacting productivity at work?
12. Tell us about a time when you had to access important information from a colleague who was uncooperative?
13. How do you deal with negative feedback at work? Tell us about a time you made improvements after receiving feedback on your work?
14. Tell us about a time when you were under pressure to deliver a project on time. How did you handle it?
15. What is your take on team-building exercises and routine outings with your team?

Additional Reading: Understand the interview processes at other FAANG Companies! Check out our Interview Guides for:

• Microsoft
• Google
• Netflix

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