99Games Backend Developer Interview Questions and Answers

There were two coding questions; one was related to linked lists, and the other was linked to binary trees.

Q1. Can you elaborate on the project discussion you mentioned in your resume?
Ans. 
Developed a web application for tracking inventory and sales data
• Used React for front-end development

• Implemented RESTful APIs using Node.js and Express for back-end

• Utilized MongoDB for database management

• Integrated authentication and authorization features for secure access

• Implemented data visualization using Chart.js
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Q2. Can you provide the code to reverse a linked list?
Ans. 
Reversing a linked list involves changing the direction of pointers to go from the end to the beginning.
• Start by initializing three pointers: current, previous, and next.

• Iterate through the linked list, updating the pointers to reverse the direction of the links.

• Update the head of the linked list to point to the new first node, which was the original last node.
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Q3. Some questions were asked regarding the four pillars of Object-Oriented Programming (OOP)?
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Q4. Questions related to pointers, dangling pointers.
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Q1. Program for finding the perfect squares between two numbers.
Ans. 
Program to find perfect squares between two numbers
• Iterate through numbers between the given range

• Check if the square root of the number is an integer

• If yes, then it is a perfect square
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Q2. What are smart pointers in C++?
Ans. 
Smart pointers in C++ are objects that act like pointers but provide automatic memory management.
• Smart pointers help prevent memory leaks by automatically managing memory allocation and deallocation.

• Examples include unique_ptr, shared_ptr, and weak_ptr.

• unique_ptr is used for exclusive ownership, shared_ptr for shared ownership, and weak_ptr to prevent circular references.
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Q3. What is mutual exclusion in the context of concurrent programming?
Ans. 
Mutual exclusion is a concept in concurrent programming where only one thread can access a shared resource at a time.
• Ensures that only one thread can access a critical section of code at a time

• Prevents race conditions and data corruption

• Commonly implemented using locks, semaphores, or mutexes

• Example: Using a mutex to protect a shared variable in a multi-threaded application
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Q4. What is the process for implementing multithreading?
Ans. 
Implementing multithreading involves creating and managing multiple threads to execute tasks concurrently.
• Identify the tasks that can be executed concurrently

• Create and manage multiple threads to execute these tasks simultaneously

• Use synchronization techniques like locks and semaphores to prevent race conditions

• Handle communication and coordination between threads

• Consider thread safety and resource sharing issues
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Basic aptitude test, if you know basic maths you can easily crack it.

3 coding questions and 10 logical reasoning questions

Play a game on tablet which consists of coding questions

Basic coding test like palindrome, series,arrays

Q1. Logical questions,puzzle, behavioural round, introduction
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Prepare aptitude well as some questions are tricky which consume our time. There are 20 questions in total. And most of them are mathematical numeric problems.

This round is included in aptitude round in which you have to write down 3 coding problems which are easy one if you are moderate programmer

Q1. Java opps concepts, writing programs, logical reasoning questions, famous logical problems like water jug problem. Etc
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Q1. Your pros and cons, background information, etc
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Q1. In this round director asks for logical questions, it's a chill round but there are some brainstorming questions which checks you thinking capacity. I will not disclose the questions but hint is "Thinking...read more
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Easy applitude test simple question on arithmetic

Simple coding like Fibonacci

I was given 10 logical questions to solve on a portal with 30min timer.

Most question were printing of patterns, fibonacci, prime no., palindrome etc.
out of 10 questions atleast 8 has to be right to qualify.

Q1. This round is conducted by senior developer, where they ask some logical coding questions to solve on paper.
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Q2. Some complex pattern questions.
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Q1. This is the round with CEO who again ask for some logical question & verbal answering. All they wanna se is how you approach towards problems.
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Q1. Salary negotiation only if you clear the one-on-one CEO round.
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