Facebook Senior Software Engineer Interview Questions and Answers

Q1. Print the nodes of a n-ary tree in an arc wise manner as seen from the outside.
Ans. 
Print nodes of n-ary tree in arc wise manner from outside
• Traverse the tree level by level from outside to inside

• Use a queue to keep track of nodes at each level

• Print the nodes at each level in a clockwise or anticlockwise manner
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Q1. Coding and behavioral questions
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Q1. Given array of integer create subarray with sum = 0
Ans. 
Create subarrays with sum = 0 from given array of integers.
• Iterate through the array and keep track of the running sum.

• Store the running sum in a hashmap and check if the current sum - any previous sum equals 0.

• If yes, then the subarray between those two indices has a sum of 0.
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Q2. Left view of binary tree
Ans. 
The left view of a binary tree is the set of nodes visible when the tree is viewed from the left side.
• Traverse the tree in a level order manner and keep track of the first node at each level.

• Use a queue to store nodes at each level and update the left view nodes accordingly.

• Example: For a binary tree with root node 1, left child 2, and right child 3, the left view would be [1, 2].
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Q1. Cloud Engineering profile needs detailed knowledge on cloud operations and security. It also need’s infrastructure to be setup and architected to decide on which cloud to be setup like private ,public or h...read more
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Q2. Salary package for me
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Q3. 1.5 Cr with US base office location for me - Chaitra S Kulkarni
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Q4. I need new profile to grow for this upcoming IT world like RSA Cloud and JIO Cloud
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Q5. Need company to be tied with Indian government
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Q6. Needs attention from Karnataka government
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Round duration - 60 minutes
Round difficulty - Medium

Technical Interview round with questions on C#, Design patterns, OOPS etc.

Q1. What is a base class?
Ans. 
A base class, in the context of C#, is a class that is used to create, or derive, other classes. Classes derived from a base class are called child classes, subclasses or derived classes. A base class does not inherit from any other class and is considered parent of a derived class.
The base class forms the means by which inheritance is accomplished through derivation. A class derived from a base class inherits both dat
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Q2. What is a singleton design pattern?
Ans. 
Singleton design pattern in C# is one of the most popular design patterns. In this pattern, a class has only one instance in the program that provides a global point of access to it. In other words, a singleton is a class that allows only a single instance of itself to be created and usually gives simple access to that instance.
The following are the common characteristics of a singleton pattern.
Private and parameter le...read more
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Q3. What are the different access modifiers in C#?
Ans. 
C# has the following access modifiers:
Modifier Description
public The code is accessible for all classes
private The code is only accessible within the same class
protected The code is accessible within the same class, or in a class that is inherited from that class. You will learn more about inheritance in a later chapter
internal The code is only accessible within its own assembly, but not from another assembly. You will
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Q4. What is the default access modifier in C#?
Ans. 
By Default, access modifier of Class is 'Internal' and 'Private' for Data Member and Member Function of Class.
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This round contains live coding round on any online editor.

Q1. This round based on your profile related technical questions.
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Q1. System design round as well as technical related to the applied profile
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Q1. Normal organisational fitment questions
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Q1. HR discussion on offered compensation
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They given 2 program to to 1-2 hour

Q1. Ask basic programming questions
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