LinkedIn Internship Trainee Interview Questions and Answers

Bubble sort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements and swaps them if they are in the wrong order.

• Start from the first element and compare it with the next element

• If the next element is smaller, swap them

• Repeat this process for all elements in the array

• Continue this process until no more swaps are needed

A program to print all prime numbers

• Take input from user for range of numbers

• Loop through the range and check if each number is prime

• Print the prime numbers

Hashmap is a data structure that stores key-value pairs and allows constant time access to values based on their keys.

• Hashmap uses a hash function to map keys to indices in an array.

• Collisions can occur when multiple keys map to the same index, which can be resolved using techniques like chaining or open addressing.

• Examples of hashmap implementations include Java's HashMap class and Python's dict type.

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reuse and promotes code organization.

• The existing class is called the parent or superclass, and the new class is called the child or subclass.

• The child class inherits all the properties and methods of the parent class and can also add new properties and methods.

• For...read more

A stack is a data structure that follows the Last In First Out (LIFO) principle.

• Elements are added and removed from the top of the stack.

• Common operations include push (add element) and pop (remove element).

• Stacks are used in programming for function calls, expression evaluation, and more.

DOM stands for Document Object Model. It is a programming interface for web documents.

• DOM is a tree-like structure that represents the HTML or XML document.

• It allows developers to manipulate the content and structure of a web page using scripting languages like JavaScript.

• DOM provides a way to access and modify the elements, attributes, and text content of a web page.

• It also allows developers to add or remove elements ...read more

An interface is a contract between two components that defines the communication between them.

• An interface defines a set of methods that a class must implement.

• Interfaces allow for polymorphism and loose coupling.

• Interfaces can be used to define common behavior for unrelated classes.

• Examples include the Java Collection interface and the USB interface.

Insertion sort is a simple sorting algorithm that iterates through an array and places each element in its correct position. Merge sort is a divide and conquer algorithm that divides an array into two halves, sorts them separately, and then merges them back together.

• Insertion sort has a time complexity of O(n^2) while merge sort has a time complexity of O(n log n)

• Insertion sort is efficient for small data sets while me...read more

The interviewee is asked to print a tree vertically and find its minimum length.

• To print a tree vertically, we can use a recursive approach and traverse the tree in a top-down manner.

• To find the minimum length of the tree, we can use a similar recursive approach and traverse the tree in a bottom-up manner.

• We can keep track of the minimum length as we traverse the tree and return it at the end.