Leetcode Questions   Array Two Sum -  https://leetcode.com/problems/two-sum/ Best Time to Buy and Sell Stock -  https://leetcode.com/problems/best-time-to-buy-and-sell-stock/ Contains Duplicate -  https://leetcode.com/problems/contains-duplicate/…

Math For DSA GCD (Greatest common divisor) : The greatest common divisor (GCD) of two or more numbers is the greatest common factor number that divides them, exactly. It is also called the highest common factor (HCF). For example, the greatest comm…

MongoDB Basic Commands 1.  show dbs    -> for seeing your databases 2.  database_name   -> for creating a new database and switch to database 3.  show collections   -> for seeing databases collections 4.  db.dropDatabase()     -> for…

What is OOPs ? OOP stands for Object-Oriented Programming. It organizes code using objects, bundling data and methods together. Encapsulation protects data, inheritance promotes code reuse, and polymorphism allows the use of a common interface for…