10+ OTM Labs Interview Questions and Answers

Implement a program to compress a string by replacing consecutive duplicates with the count of repetitions.

• Iterate through the string and keep track of consecutive characters and their counts.

• Replace consecutive duplicates with the count of repetitions.

• Handle the case where the count of repetitions is greater than 1 and less than or equal to 9.

The task is to find the maximum number of non-crossing rope connections possible between houses on each bank of a river.

• Sort the arrays A and B in ascending order.

• Use dynamic programming to find the longest increasing subsequence between A and B.

• The length of the longest increasing subsequence is the maximum number of non-crossing connections.

Object-Oriented Programming concepts include encapsulation, inheritance, and polymorphism, which are used to organize and manipulate data in data structures and algorithms.

• Encapsulation: Bundling data and methods that operate on the data together in a single unit (object). Example: a class representing a car with properties like color and methods like drive().

• Inheritance: Allowing a class to inherit properties and methods from another class. Example: a subclass of the car cla...read more

Explanation of insert, select, and join queries in a database management system.

• Insert query is used to add new records to a table.

• Select query is used to retrieve data from a table based on specified criteria.

• Join query is used to combine rows from two or more tables based on a related column between them.

• Examples: INSERT INTO table_name (column1, column2) VALUES (value1, value2); SELECT * FROM table_name WHERE condition; SELECT t1.column, t2.column FROM table1 t1 JOIN table...read more

To compile all Java files inside a folder using Cmd, navigate to the folder and run 'javac *.java'

• Open Command Prompt and navigate to the folder containing the Java files

• Run the command 'javac *.java' to compile all Java files in the folder

• Check for any errors or warnings in the output

Query to find 2nd highest salary from a table

• Use ORDER BY and LIMIT

• Exclude the highest salary using subquery

• Handle cases where there are ties

Create a C++ class with implementation

• Create a class named 'Person' with private data members like name, age, and gender

• Include public member functions to set and get the data members

• Implement the class in a separate header and source file

Database design is crucial for efficient data management. SQL queries help retrieve and manipulate data.

• Understand the data requirements and relationships before designing the database schema

• Normalize the data to reduce redundancy and improve data integrity

• Use primary and foreign keys to establish relationships between tables

• Write efficient SQL queries to retrieve and manipulate data

• Optimize the database performance by indexing frequently queried columns

I have experience with various technologies including Java, Python, HTML/CSS, JavaScript, and SQL.

• Java

• Python

• HTML/CSS

• JavaScript

• SQL

Hashmap is a data structure that stores key-value pairs. Concurrent Hashmap is a thread-safe version of Hashmap.

• Hashmap uses hashing to store and retrieve elements based on their keys.

• Concurrent Hashmap allows multiple threads to access and modify the map concurrently.

• Hashmap has a load factor that determines when the map needs to be resized.

• Concurrent Hashmap uses a technique called lock striping to allow concurrent access to different parts of the map.

• Hashmap is not thread-...read more

Oops concepts are fundamental to object-oriented programming. They help in creating modular and reusable code.

• Encapsulation - bundling of data and methods that operate on that data

• Inheritance - creating new classes from existing ones

• Polymorphism - ability of objects to take on many forms

• Abstraction - hiding implementation details and showing only functionality

• Examples - Car class inheriting from Vehicle class, Animal class having different methods for different species

• Need - ...read more

Concatenate two linked lists alternatively

• Create a new linked list

• Traverse both linked lists simultaneously

• Alternate between adding nodes from each list to the new list

• If one list is longer than the other, add the remaining nodes to the end of the new list

Deadlock is a situation where two or more processes are unable to proceed because each is waiting for the other to release a resource.

• Deadlock occurs when two or more processes are stuck in a circular wait, where each process is waiting for a resource held by another process.

• Four necessary conditions for deadlock are mutual exclusion, hold and wait, no preemption, and circular wait.

• Example: Process A holds resource X and requests resource Y, while Process B holds resource Y a...read more

System architecture for higher experience involves scalable and efficient design.

• Focus on scalability to handle increasing user load

• Use microservices architecture for flexibility and easy maintenance

• Implement caching mechanisms for faster response times

• Utilize load balancing to distribute traffic evenly across servers

Reverse a given string

• Use a loop to iterate through the characters of the string and build a new string in reverse order

• Alternatively, use built-in functions like reverse() in some programming languages

• Consider edge cases like empty string or null input

Stream and collection api usage involves manipulating data using streams and collections in Java.

• Stream API provides a way to process collections of objects in a functional way.

• Collection API provides data structures to store and manipulate groups of objects.

• Stream API can be used to filter, map, reduce, and collect data from collections.

• Collection API includes interfaces like List, Set, and Map for different data structures.