Airtel Payments Bank Data Engineer Interview Questions and Answers

Prepare Ds algo - array, link list, stack, queue. And advance things of your domain

DS apti questions oral

Q1. Ds algo plus your domain discussion. Previous projects
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Finding possible options of moving horse in chess board

Write the polyfill of bind (custom bind)

Leetcode medium 2 question in 60 minutes.

Leet code hard 1 question

Q1. Design a hashmap and internal working .. then few questions on linked hashmap
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Q2. Assignment to make a snake and ladder
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They grasping our knowledge

Q1. They check how to grasp they ideas
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Q2. My details want to hire my skills
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Leetcode medium questions using priority queue. I don't remeber exact now

Q1. Interview round was vry simple binary tree mirror question
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Q1. 5 mins round. basics like location
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3 Coding problems to be solved in 90 minutes.

Q1. Introduction, Project Discussion, HTML Tags, Reverse a string, Level order traversal in a binary tree, Minimum swap operations to sort an array.
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Q1. N-Queen problem, Coin Change, Number of Islands
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Q1. Resume based+ DSA + Riddles
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Coding round consisted of three problems with easy to moderate level difficulty.

Q1. Variation of Minimum number of platforms required for railway station.
Ans. 
Minimum number of platforms required for a railway station depends on the maximum number of trains arriving and departing at the same time.
• Calculate the maximum number of trains arriving and departing at the same time.

• Determine the time intervals for each train's arrival and departure.

• Add extra platforms for buffer and unexpected delays.

• Consider factors like train length, frequency, and scheduling conflicts.

• Example: If...read more
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Q2. Rearrange the array such that the negative numbers are shifted to the beginning.
Ans. 
Rearrange array with negative numbers at the beginning
• Iterate through the array and move negative numbers to the beginning

• Use two pointers approach to swap elements

• Maintain the order of negative numbers while shifting them to the beginning
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Q1. Implement a simple program using multithreading.
Ans. 
A simple program using multithreading can be implemented to demonstrate parallel execution of tasks.
• Create a class that implements the Runnable interface in Java.

• Override the run() method to define the task that will run in a separate thread.

• Create instances of the class and start them using the Thread class.

• Use synchronization mechanisms like locks or semaphores to manage shared resources in a thread-safe manner.
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Q2. Explain in details about the Java Collections API.
Ans. 
Java Collections API provides a set of classes and interfaces to store and manipulate collections of objects.
• Includes interfaces like List, Set, and Map for different types of collections

• Provides classes like ArrayList, HashSet, and HashMap for implementing collections

• Offers utility classes like Collections for common operations on collections

• Introduced in Java 2 and has been expanded in subsequent versions
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