Paytm Payments Bank Software Engineer Interview Questions and Answers

Create a Snake and Ladder game simulation with board setup, player movement, and win condition.

• Define a 10x10 board using a 2D array.

• Use a mapping for snakes and ladders, e.g., {2: 23, 16: 5} for snakes and {3: 22, 10: 30} for ladders.

• Implement player movement using dice rolls (1-6).

• Check for snakes or ladders after each move to adjust player position.

• Determine win condition when a player reaches or exceeds 100.

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.

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

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.

• Exampl...read more

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