longest common substring without repeating characters, basic concepts from oops, dbms, drawing the ER model of the amazon delivery System.

They asked me to design and implement an LRU Cache with get() and put() functions in O(1) time.

Q: Can you explain the concept of polymorphism in object-oriented programming? GeeksforGeeks A: Polymorphism allows objects to be treated as instances of their parent class rather than their actual class. It enables a single interface to represent different underlying forms (data types). There are two types: compile-time (method overloading) and runtime (method overriding). Q: How would you implement a linked list using arrays? Medium A: To implement a linked list using arrays, we can use two arrays: one for storing data and another for storing the index of the next element. Each element's 'next' index points to the position of the next node in the data array. Q: Describe a project you've worked on and the technologies used. A: I developed a chat application using Firebase for authentication and real-time database functionalities. The frontend was built with React, and the app included features like user login, message exchange, and notifications