Nvidia Game Developer Interview Questions and Answers

Round duration - 60 Minutes
Round difficulty - Easy

This was the initial round consisting of some aptitude questions,technical multiple choice questions and one coding question.
The Multiple Choice Questions were pretty straight forward.

Q1. 
Snake and Ladder Problem Statement
Given a 'Snake and Ladder' board with N rows and N columns, where positions are numbered from 1 to (N*N) starting from the bottom left, alternating direction each row, f...read more
Ans. 
Find the minimum number of dice throws required to reach the last cell on a 'Snake and Ladder' board.
• Start from the bottom left cell and move according to dice outcomes (1-6).

• Utilize snakes and ladders to reach the last cell faster.

• Keep track of the minimum number of throws required to reach the last cell.

• If unreachable, return -1 as output.
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Round duration - 45 Minutes
Round difficulty - Medium

I had two interviewers in this round.Some Problem solving questions were asked in this round.

Q1. 
Anagram Pairs Verification Problem
Your task is to determine if two given strings are anagrams of each other. Two strings are considered anagrams if you can rearrange the letters of one string to form the...read more
Ans. 
Check if two strings are anagrams of each other by comparing their sorted characters.
• Sort the characters of both strings and compare them.

• Use a dictionary to count the frequency of characters in each string and compare the dictionaries.

• Ensure both strings have the same length before proceeding with comparison.

• Example: For input 'spar' and 'rasp', after sorting both strings, they become 'aprs' which are equal, so return...read more
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Q2. Can you explain all the main Object Oriented Programming concepts?
Ans. 
Object Oriented Programming concepts include encapsulation, inheritance, polymorphism, and abstraction.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class). Example: Class Car with properties like color and methods like drive().

• Inheritance: Creating new classes based on existing classes, inheriting their attributes and methods. Example: Class SUV inheriting from class Car.

• Polymor...read more
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Q3. Can you explain one of your projects?
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Round duration - 45 Minutes
Round difficulty - Easy

Number Of Interviewers : 2
I was asked two problem solving questions and I was asked to explain my projects.

Round duration - 60 minutes
Round difficulty - Medium

The test was in the evening which was not too late. It was conducted on Hackerrank which is a very common platform and was hence familiar. There were 26 questions:
Q1: Coding Question
3 languages were allowed: c, java8, python3
Q2 - Q26: Multiple Choice Questions

Q1. 
Intersection of Linked List Problem
You are provided with two singly linked lists containing integers, where both lists converge at some node belonging to a third linked list.
Your task is to determine t...read more
Ans. 
Find the node where two linked lists merge, return -1 if no merging occurs.
• Traverse both lists to find the lengths and the last nodes

• Align the starting points of both lists by moving the longer list's pointer ahead by the difference in lengths

• Traverse both lists simultaneously until a common node is found, which is the merging point
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Round duration - 60 Minutes
Round difficulty - Medium

This was an Online Coding+MCQ round where we had a total of 50 MCQ questions and 1 coding problem. The coding problem was of easy to medium level.

Q1. 
Add Two Numbers Represented as Linked Lists
Given two linked lists representing two non-negative integers, where the digits are stored in reverse order (i.e., starting from the least significant digit to ...read more
Ans. 
Add two numbers represented as linked lists in reverse order and return the sum as a linked list.
• Traverse both linked lists simultaneously while keeping track of carry.

• Create a new linked list to store the sum digits.

• Handle cases where one list is longer than the other or there is a final carry.

• Remember to reverse the final linked list before returning the head.
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Round duration - 60 Minutes
Round difficulty - Medium

This round had 1 question related to Binary Tree Traversal and then the rest of the questions that the interviewer asked me were mostly related to OOPS and C++.

Q1. 
Level Order Traversal Problem Statement
Given a binary tree of integers, return the level order traversal of the binary tree.
Input:
The first line contains an integer 'T', representing the number of te...read more
Ans. 
Return the level order traversal of a binary tree given in level order with null nodes represented by -1.
• Create a queue to store nodes for level order traversal

• Start with the root node, enqueue it, then dequeue and print its value, enqueue its children, repeat until queue is empty

• Handle null nodes represented by -1 by skipping them during traversal
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Q2. What is a namespace in C++?
Ans. 
A namespace in C++ is a declarative region that provides a scope for the identifiers within it.
• Namespaces help in organizing code by grouping related classes, functions, and variables.

• They prevent naming conflicts by allowing the same name to be used in different namespaces.

• Example: namespace myNamespace { int x; }

• Example: using namespace std; // for using standard library functions without prefix
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Q3. Why do we need the Friend class and function in Object-Oriented Programming?
Ans. 
Friend class and function in OOP allows specific classes or functions to access private and protected members of a class.
• Friend class/function can access private and protected members of a class without violating encapsulation.

• It allows for selective sharing of data between classes without exposing all members to the outside world.

• Friendship is not mutual - a class can declare another class as a friend, but the other c...read more
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Q4. What does a static member in C++ mean?
Ans. 
A static member in C++ is a member of a class that is shared among all instances of the class.
• Static members are declared using the 'static' keyword.

• They are not associated with any specific instance of the class, but rather with the class itself.

• They can be accessed using the scope resolution operator '::'.

• Static members are commonly used for constants, utility functions, or shared data among all instances of a class.
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Round duration - 60 minutes
Round difficulty - Medium

This round was more aligned towards Computer Networks and had 1 question of DSA realted to Binary Trees and the interview ended with the famous Die-Hard Puzzle.

Q1. 
Spiral Order Traversal of a Binary Tree
Given a binary tree with N nodes, your task is to output the Spiral Order traversal of the binary tree.
Input:
The input consists of a single line containing elem...read more
Ans. 
Implement a function to return the spiral order traversal of a binary tree.
• Traverse the binary tree level by level, alternating the direction of traversal from left to right and right to left.

• Use a queue to keep track of nodes at each level and a stack to reverse the order of nodes at even levels.

• Handle null nodes appropriately to maintain the spiral order traversal.

• Example: For input 1 2 3 -1 -1 4 5, the output should...read more
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Q2. Can you describe the OSI Reference Model?
Ans. 
The OSI Reference Model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven layers.
• The OSI Reference Model stands for Open Systems Interconnection Reference Model.

• It consists of seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has specific functions and communicates with the adjacent layers.

• The model help...read more
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Q3. What is the use of a router and how does it differ from a gateway?
Ans. 
A router is a networking device that forwards data packets between computer networks. It differs from a gateway in terms of functionality and scope.
• A router operates at the network layer of the OSI model, making decisions based on IP addresses.

• Routers connect multiple networks together and determine the best path for data to travel.

• Gateways, on the other hand, translate between different types of networks or protocols.

• ...read more
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Q4. How can you measure exactly 4 liters of water using only a 3-liter can and a 5-liter can?
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Q1. Find a duplicate in a String OOPs concept Java 8 features
Ans. 
The question is about finding a duplicate in a string.
• Convert the string into an array of characters

• Create a HashSet to store unique characters

• Iterate through the array and check if each character is already present in the HashSet

• If a character is already present, it is a duplicate
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Q1. Java OOPs concept Comparator vs Comparable Streams Lambda Expression
Ans. 
Comparator vs Comparable, Streams, Lambda Expression
• Comparator and Comparable are interfaces used for sorting objects in Java

• Comparator is used for custom sorting logic, while Comparable is used for natural sorting order

• Streams are a sequence of elements that can be processed in parallel or sequentially

• Lambda expressions are used to write concise and functional code in Java
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Q1. System Desing of Network Management System
Ans. 
A network management system is designed to monitor and control network devices and ensure their efficient operation.
• The system should have a centralized dashboard to display real-time network status and performance metrics.

• It should support automated network discovery and device configuration management.

• The system should provide alerts and notifications for network events and failures.

• It should have the ability to gene...read more
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Q1. Background why Tejas Salary Discussion
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