Airtech Engineers Interview Questions and Answers

The task is to find the length of the longest common subsequence between two given strings.

• Use dynamic programming to solve this problem efficiently.

• Create a 2D array to store the lengths of longest common subsequences of substrings.

• Iterate through the strings to fill the array and find the length of the longest common subsequence.

• Example: For strings 'abcde' and 'ace', the longest common subsequence is 'ace' with length 3.

Determine if it is possible to accommodate all passenger trips within a car's capacity without exceeding it at any point.

• Iterate through each trip and keep track of the total number of passengers in the car at each point.

• Check if the total number of passengers exceeds the car capacity at any point.

• Return 'True' if all trips can be accommodated within the car capacity, otherwise return 'False'.

Calculate the Nth Fibonacci number efficiently using dynamic programming.

• Use dynamic programming to store previously calculated Fibonacci numbers to avoid redundant calculations.

• Start with base cases F(1) and F(2) as 1, then iterate to calculate subsequent Fibonacci numbers.

• Time complexity can be optimized to O(N) using dynamic programming.

• Example: For N = 5, the 5th Fibonacci number is 5.

Spark context is the main entry point for Spark functionality and represents the connection to a Spark cluster.

• Main entry point for Spark functionality

• Represents connection to a Spark cluster

• Used to create RDDs, broadcast variables, and accumulators

Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class.

• Allows for code reusability by creating a new class based on an existing class

• Derived class inherits properties and behaviors of the base class

• Supports the concept of polymorphism and encapsulation

• Example: Class 'Car' can inherit from class 'Vehicle' and inherit its attributes like 'color' and methods like 'drive()'