Nissan Digital Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Medium

Technical round with questions based on DSA were discussed.

Q1. 
Ninja and Sorted Array Merging Problem
Ninja is tasked with merging two given sorted integer arrays ARR1 and ARR2 of sizes 'M' and 'N', respectively, such that the merged result is a single sorted array w...read more
Ans. 
Merge two sorted arrays into one sorted array within the first array.
• Create a pointer for the last index of ARR1 and ARR2 to start merging from the end.

• Compare elements from both arrays and place the larger element at the end of ARR1.

• Continue this process until all elements are merged in sorted order within ARR1.
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Q2. 
Reverse Alternate Levels of a Perfect Binary Tree Problem Statement
Given a perfect binary tree consisting of 'N' nodes, reverse the nodes at alternate levels in the tree (i.e., reverse level 2, level 4, ...read more
Ans. 
Reverse alternate levels of a perfect binary tree by reversing nodes at even levels starting from level 2.
• Traverse the tree in level order and store nodes at even levels in a separate list.

• Reverse the list of nodes at even levels.

• Update the tree with the reversed nodes at even levels.

• Repeat the process for alternate levels starting from level 2.
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Round duration - 60 minutes
Round difficulty - Medium

Technical round with questions based on OS, Java were discussed.

Q1. What are the characteristics of distributed file systems?
Ans. 
Characteristics of distributed file systems include scalability, fault tolerance, and data replication.
• Scalability: Distributed file systems can easily scale to accommodate a large amount of data and users.

• Fault tolerance: They are designed to continue functioning even if some components fail, ensuring high availability.

• Data replication: Data is often replicated across multiple nodes to ensure reliability and performan...read more
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Q2. Design a file sharing mechanism between two users.
Ans. 
Design a file sharing mechanism between two users.
• Implement a secure login system for both users.

• Allow users to upload files to a shared server.

• Provide a way for users to view and download files shared by the other user.

• Implement access control to ensure only authorized users can access the shared files.
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Q3. What is ConcurrentHashMap in Java?
Ans. 
ConcurrentHashMap is a thread-safe implementation of the Map interface in Java.
• ConcurrentHashMap allows multiple threads to read and write to the map concurrently without causing any issues like deadlocks or data corruption.

• It achieves thread-safety by dividing the map into segments, each of which can be locked independently.

• ConcurrentHashMap is more efficient than using synchronized maps for concurrent access.

• Example:...read more
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Q4. How do you analyze the usage history of an application?
Ans. 
Analyzing usage history involves tracking user interactions, patterns, and trends to improve application performance.
• Collect and store user interaction data such as clicks, page views, and time spent on each feature.

• Use analytics tools to generate reports and visualize usage patterns.

• Identify popular features, user preferences, and areas for improvement based on usage data.

• Implement A/B testing to compare different ver...read more
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