10+ Internshala Interview Questions and Answers

Create a deep copy of a linked list with random pointers without using references of original nodes.

• Iterate through the original linked list and create a new node for each node in the list.

• Store the mapping of original nodes to new nodes in a hashmap to handle random pointers.

• Update the random pointers of new nodes based on the mapping stored in the hashmap.

• Return the head of the copied linked list.

Determine the maximum amount of money a thief can steal from houses without looting two consecutive houses.

• Create an array 'dp' to store the maximum money that can be stolen from each house without looting two consecutive houses.

• Iterate through the houses and update 'dp' based on the maximum money that can be stolen from the current house.

• Return the maximum value in 'dp' as the answer.

SQL queries are executed in a specific order to ensure accurate results.

• SQL queries are executed in the following order: FROM, WHERE, GROUP BY, HAVING, SELECT, ORDER BY.

• The FROM clause specifies the tables involved in the query.

• The WHERE clause filters the rows based on specified conditions.

• The GROUP BY clause groups the rows based on specified columns.

• The HAVING clause filters the grouped rows based on specified conditions.

• The SELECT clause selects the columns to be displaye...read more

I have experience with various machine learning models such as linear regression, decision trees, random forests, and neural networks.

• Linear regression is used for predicting continuous outcomes.

• Decision trees are used for classification and regression tasks.

• Random forests are an ensemble method that combines multiple decision trees for improved accuracy.

• Neural networks are used for complex pattern recognition and prediction tasks.

Yes, I can design a website similar to Amazon by focusing on user-friendly interface, robust search functionality, secure payment options, and personalized recommendations.

• Focus on user-friendly interface with easy navigation

• Implement robust search functionality with filters and sorting options

• Provide secure payment options with encryption and fraud protection

• Include personalized recommendations based on user behavior and preferences

Activity is a single screen with a user interface, while Fragment is a portion of the user interface in an activity.

• Activity is a standalone component that can be launched by an application, while Fragment is a reusable component that can be added to an activity.

• An activity can contain multiple fragments, but a fragment cannot contain multiple activities.

• Fragments are used to create a flexible and dynamic UI, while activities are used to manage the lifecycle and navigation of...read more

Yes, I will be able to travel and reach the office in Gurgaon at 9:30 from Monday to Friday.

• I am located in a nearby area and can easily commute to Gurgaon.

• I have a reliable mode of transportation that allows me to reach the office on time.

• I am flexible with my schedule and can adjust my timings accordingly.

• I understand the importance of punctuality and will make sure to be at the office by 9:30.

• I am committed to this internship opportunity and will prioritize my travel arran...read more

I am a software engineering student with a passion for coding. Here is a code to find repetitive characters in a string.

• Iterate through the characters in the string and store their occurrences in a HashMap.

• Check the HashMap for characters with occurrences greater than 1 to find repetitive characters.

• Return the repetitive characters as an array of strings.

Left Join is a type of join operation in SQL that returns all rows from the left table and the matched rows from the right table.

• Left Join combines rows from two tables based on a related column between them.

• It includes all rows from the left table, even if there are no matches in the right table.

• If there are no matches, NULL values are included for columns from the right table.

• Example: SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.id;

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The 25 Horse Problem is a logic puzzle that involves determining the fastest 3 horses out of 25 using minimal races.

• Divide the 25 horses into groups of 5 and race them to determine the fastest horse in each group.

• Then race the fastest horses from each group to determine the top 3 fastest horses overall.

• This approach minimizes the number of races needed to find the top 3 horses.

Components and Flux are important concepts in React for building scalable and maintainable applications. A library is a collection of pre-written code that can be reused in different projects.

• Components are reusable building blocks in React that encapsulate functionality and can be composed to create complex UIs

• Flux is a pattern for managing data flow in React applications, ensuring unidirectional data flow and predictable state changes

• Libraries like React Router and Redux pr...read more

HAVING is used with GROUP BY to filter groups, WHERE is used to filter rows

• HAVING is used with GROUP BY to filter groups based on aggregate functions

• WHERE is used to filter rows based on conditions

• HAVING is applied after GROUP BY, WHERE is applied before GROUP BY

• Example: SELECT department, AVG(salary) FROM employees GROUP BY department HAVING AVG(salary) > 50000;

• Example: SELECT * FROM employees WHERE department = 'Sales';

A linked list is a data structure where each element points to the next element in the sequence.

• Each element in a linked list, called a node, contains data and a reference to the next node in the sequence.

• Linked lists can be singly linked (each node points to the next node) or doubly linked (each node points to both the next and previous nodes).

• To traverse a linked list, you start at the head node and follow the references to the next nodes until you reach the end (where the ...read more

Pointers in C are variables that store memory addresses of other variables.

• Pointers are used to access and manipulate memory directly.

• They are denoted by an asterisk (*) before the variable name.

• Example: int *ptr; // declares a pointer to an integer variable

My name is John Smith.

• Full name is John Smith

• Common name in English-speaking countries

• Easy to remember and pronounce

Arrays are a data structure that stores a collection of elements of the same data type in contiguous memory locations.

• Arrays have a fixed size determined at the time of declaration.

• Elements in an array are accessed using an index starting from 0.

• Arrays can store primitive data types or objects.

• Example: String[] names = {"Alice", "Bob", "Charlie"};