Nehish Interview Questions and Answers

90 minute test on hacker rank consisting of 3 coding questions all of medium difficulty. Most candidates are required to solve more than 1 question.

Q1. Questions on concepts of OOPS and Operating Systems.
Add your answer
Q2. Find least common ancestor of a binary tree.
Ans. 
Find the lowest common ancestor of a binary tree.
• Traverse the tree recursively from the root node.

• If the current node is null or matches either of the given nodes, return the current node.

• Recursively search for the nodes in the left and right subtrees.

• If both nodes are found in different subtrees, return the current node.

• If both nodes are found in the same subtree, continue the search in that subtree.
Answered by AI
Add your answer
Q3. Find first missing positive integer from an array for non-negative integers.
Ans. 
Find first missing positive integer from an array of non-negative integers.
• Create a hash set to store all positive integers in the array

• Loop through the array and add all positive integers to the hash set

• Loop through positive integers starting from 1 and return the first missing integer not in the hash set
Answered by AI
Add your answer

Q1. Design a parking lot
Ans. 
Design a parking lot
• Consider the size and capacity of the parking lot

• Decide on the layout and organization of parking spaces

• Implement a system to manage parking availability and reservations

• Include features like ticketing, payment, and security

• Consider scalability and future expansion
Answered by AI
Add your answer

Q1. Given a grid which represents an ocean( For all index i,j if mat[i][j] = 1 is island and mat[i][j] = 0 means water). Find the island with largest area.
Ans. 
Find the largest island area in a grid representing an ocean using DFS or BFS.
• Use Depth-First Search (DFS) or Breadth-First Search (BFS) to explore the grid.

• Mark visited cells to avoid counting them multiple times.

• Count the size of each island during the traversal.

• Example: For a grid [[1,0,0],[1,1,0],[0,0,1]], the largest island has area 3.

• Keep track of the maximum area found during the exploration.
Answered by AI
Add your answer
Q2. Given list of strings group them into distinct anagrams.
Ans. 
Group list of strings into distinct anagrams.
• Create a hash table with sorted string as key and list of anagrams as value.

• Iterate through the list of strings and add each string to its corresponding anagram list in the hash table.

• Return the values of the hash table as a list of lists.
Answered by AI
Add your answer

Standard Aptitude topics, 30 mins - 30 questions

Q1. Case Study for how to design a data Lake ? standard questions - tell me about yourself, why us
Add your answer
Q2. Case Study for how to design a chess game
Ans. 
Designing a chess game involves defining rules, user interface, and game mechanics for an engaging experience.
• Define the rules: Standard chess rules include piece movement, check, checkmate, and stalemate.

• User interface: Create a visually appealing board and pieces, with options for 2D or 3D views.

• Game mechanics: Implement turn-based play, timers, and difficulty levels for AI opponents.

• Multiplayer options: Allow for on...read more
Answered by AI
Add your answer

Q1. What you do and how you can sell the product to customer
Ans. 
I understand the customer's needs and demonstrate how our product can meet those needs, highlighting its unique features and benefits.
• Listen actively to the customer's needs and concerns

• Explain how our product can solve their problems or meet their needs

• Highlight the unique features and benefits of our product

• Provide examples of how our product has helped other customers

• Address any objections or concerns the customer m...read more
Answered by AI
Add your answer

Q1. What do you know About CDS?
Ans. 
A Credit Default Swap (CDS) is a financial derivative that allows an investor to 'swap' or transfer credit risk with another party.
• CDS are used to hedge against the risk of default on debt instruments, such as bonds.

• For example, if an investor holds a corporate bond, they can buy a CDS to protect against the risk of the company defaulting.

• The buyer of a CDS pays periodic premiums to the seller, who agrees to compensate...read more
Answered by AI
Add your answer