MATHEUS IT SOLUTION Interview Questions and Answers

Heap sort is a comparison-based sorting algorithm that uses a binary heap data structure.

• Heap sort involves building a heap from the input array and then repeatedly removing the largest (for max heap) or smallest (for min heap) element from the heap and adding it to the sorted array.

• The structure of heap sort involves two main steps: heapify the input array to create a heap and then repeatedly extract the root element to get the sorted array.

• Max heap is a binary tree where th...read more

Data hiding in C# refers to the practice of encapsulating data within a class to restrict access from outside the class.

• Data hiding is achieved in C# using access modifiers like private, protected, and internal.

• Private members can only be accessed within the same class.

• Protected members can be accessed within the same class or derived classes.

• Internal members can be accessed within the same assembly.

• Encapsulation is used to hide the internal state of an object and only expose...read more

Use a stack to reverse print a linked list

• Create a stack to store the elements of the linked list

• Traverse the linked list and push each element onto the stack

• Pop elements from the stack and print them to get the reverse order

Code to find duplicate characters in an array of strings

• Iterate through each string in the array

• For each string, iterate through each character and store in a set

• If a character is already in the set, it is a duplicate

OOPS concepts in Java are fundamental principles of object-oriented programming such as inheritance, encapsulation, polymorphism, and abstraction.

• Inheritance: Allows a class to inherit properties and behavior from another class. Example: class B extends class A.

• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: private variables with public getter and setter methods.

• Polymorphism: Ability of a method to do different things based on t...read more