Facebook Coding Interview Questions – Your Complete Coding Interview Guide

Are you looking to ace your Facebook coding interview? If yes, then you are at the right place!

Facebook needs no introduction. It is one of the top tech companies in the world. Working with Facebook means working with the smartest engineers in the world. 

However, the main concern of candidates looking to get into this tech giant is its Selection process. 

There are many ways in which you can prepare for the Facebook coding round. But according to some candidates, solving most asked questions was their best decision.

So if you are also planning for a facebook interview, And are looking for Coding questions, then.  We present a complete coding interview guide. Along with the most asked Facebook Coding Interview Questions. Which can help you with interview preparation.

You can also take cues from this interview prep guide for preparing uber interview questions and other company’s interview questions.

So let’s get started! 

Programming Languages Facebook requires.

Before solving coding questions it is important to know the required coding languages.

Well, Facebook does not ask you to master all coding languages. In order to crack the coding interview for Facebook, it is important to know at least one coding language. 

 The candidate can write code in any of the following languages.

• C++
• Python
• Java
• Ruby

But, It is always better to know more than one. Another important concept Candidates should know about is Data structure and Algorithms. 

Questions related to DSA are mostly asked in Facebook coding interviews.

 Facebook Coding Interview questions.

Here are some most common questions asked in Facebook interviews.

 What is the difference between a linked list and an array?

This is a typical interview question that you might be asked in a Facebook coding interview. The key here is to know what is between these two. An array is a linear data structure that stores information in a coterminous block of memory. A linked list is a data structure that comprises a series of nodes, where every note contains a reference to the following note in the list.

 How would you reverse a singly linked list?

This is another important question that you may be asked in a Facebook coding interview. To reverse a singly linked list, you should traverse the list and monitor the previous and current nodes. Then, you should change the following pointer of the current node to highlight the previous node.

 How would you implement a stack using a queue?

This is a question asked to test your data structure knowledge.A stack is an information structure that allows you to push and pop components in a FIFO order. A queue is a data structure that grants you to enqueue and dequeue components in FIFO oder.

To execute a stack utilizing a queue, You should enqueue the components onto one queue and dequeue the components from the other queue.

Take an example of the array which consists of positive numbers. You have to find its largest subset in the given array. The array will contain components that will have Fibonacci numbers.

The fundamental strategy for figuring out the greatest subset of a variety of all the positive numbers which may contain Fibonacci numbers in order to underline all the components present in the array. After that, you should check for each number irrespective if it will be a Fibonacci number. In such an event, add it to the result.

Even though the recently referenced approach is fundamental, it isn’t viable.

Here is an algorithm to solve this question.

• Firstly You have to find max value in array
• Then Create a Fibonacci number till you reach the maximum number in  the given array then store that number in the given hash table
• At last, Make sure to Traverse the given array and sum all  present numbers in the given array. 

 Explain How you can multiply all the large numbers that are represented as strings.

Answer: We start by multiplying the given last digit of second number with its first number, by multiplying second last digit of the second number with its first number. Then adding the two. This process can go till all digits of the second number can get represented.

Some  Common Interview coding Questions.

• What is the time complexity of a quicksort algorithm?
•  What is a hash table?
•  What is the difference between a stack and a queue?
•  What is recursion?
•  What is the time complexity of a binary search tree?
•  What are some of the common data structures used in computer programming?

Facebook interview questions are similar to uber interview questions

What Facebook Coding Interview Looks like.

To land in any software company the candidate should learn about the whole coding interview process. The Facebook coding interview process consists of the following rounds:

Submission of application form: Candidates should submit all details along with their CV in this round.

Shortlisted candidates can expect a call for the Initial phone call round

 Initial Phone call interview: HR from Facebook will connect to you through this phone interview. The recruiter will be interested in the candidate’s Skills and experiences.

Shortlisted candidates will be called for the Coding Round.

 Coding Round: Firstly the coding round is the most Importing Round of this whole process. Facebook will assign you 2-3 Coding questions and will ask you to complete them at a specific time.

The shortlisted candidates then get called for an Onsite interview.

Onsite interview: Like many software companies, Facebook’s onsite interview consists of 3 rounds :

• Ninja Portion: It consists of 2 coding interviews
• Pirate Portion: It consists OF 2 system design interviews.
• Jedi portion: It consists of 1 behavioral interview.

Candidates passing all these rounds can expect verbal offers in the final round.

Conclusion: 

If you’re looking to become an engineer at Facebook, you should prepare yourself by solving the most asked coding interview questions. While the organization doesn’t want you to master all programming languages. However,  it is important to learn at least one. The concept of Data structure and algorithm is very important in order to crack Facebook coding interviews.