Sana International School Interview Questions and Answers

Given an array of integers, remove K elements from either end to maximize sum of remaining elements.

• Iterate through all possible combinations of removing K elements from start and end

• Calculate sum of remaining elements for each combination

• Return the maximum sum obtained

Check if a given array contains a valid triplet where two elements sum up to the third.

• Iterate through all possible triplets in the array and check if any of the conditions are satisfied.

• Use nested loops to compare each element with every other element in the array.

• Handle cases where the elements are not distinct by ensuring i != j, j != k, and i != k.

Check if a given matrix is idempotent by verifying if M * M equals M.

• Calculate the product of the matrix with itself and compare it with the original matrix.

• If the product equals the original matrix, then it is idempotent.

• Iterate through the matrix elements to perform the necessary calculations.

Spring is a framework for building Java applications, while Spring Boot is a tool for quickly creating Spring-based applications.

• Spring provides a comprehensive framework for building Java applications, including features like dependency injection, AOP, and MVC.

• Spring Boot is a tool that simplifies the process of creating Spring-based applications by providing auto-configuration and embedded servers.

• Spring Boot also includes features like health checks, metrics, and externali...read more

Encapsulation is the process of hiding implementation details and providing a public interface for accessing the functionality.

• Encapsulation helps in achieving data abstraction and information hiding

• It prevents direct access to the internal state of an object

• It allows for better control over the data and prevents unintended modification

• Example: A class with private variables and public methods to access them

Python has several built-in data types including integers, floats, strings, booleans, lists, tuples, and dictionaries.

• Integers are whole numbers, positive or negative

• Floats are decimal numbers

• Strings are sequences of characters

• Booleans are either True or False

• Lists are ordered collections of items

• Tuples are ordered, immutable collections of items

• Dictionaries are unordered collections of key-value pairs

C++ is an extension of C with object-oriented programming features.

• C++ supports classes and objects while C does not.

• C++ has better support for function overloading and templates.

• C++ has a built-in exception handling mechanism.

• C++ supports references while C does not.

• C++ has a standard library that includes many useful functions.

• C++ is more complex than C and requires more memory.

• C++ is often used for developing large-scale applications.

• C is often used for system programming ...read more

Java 8 features include lambda expressions, functional interfaces, streams, and default methods.

• Lambda expressions allow functional programming in Java

• Functional interfaces enable the use of lambda expressions

• Streams provide a concise way to process collections

• Default methods allow interfaces to have implementation

• Date and Time API improvements

• Nashorn JavaScript engine

• Parallel array sorting

• Type annotations