What is a Stack? A stack is an abstract data type that adheres to the Last-In-First-Out (LIFO) principle in the…

What is a Queue in DSA? A queue is a linear data structure that holds elements in a certain order. It accesses items using the FIFO (First In First Out) method. It can only be changed by adding data entities at one end…

A Binary Search Tree (BST) is a type of binary tree that satisfies the following properties: For any node in…

What is the Lowest Common Ancestor? In a tree, the lowest common ancestor (LCA) of two nodes, n1 and n2,…

What is a Trie in DSA? A trie, often known as a prefix tree, is a tree-like data structure used…

A heap is a specialized tree-based data structure that satisfies the heap property. It is commonly used to implement priority…

Problem Statement (Asked By Google) Given a list of integers and a target number k, determine if there exist two…

Problem Statement (Asked By Uber) Given a list of integers, return a new list such that each element at index…

Given the root of a binary tree, create two functions: serialize(root) – Converts the binary tree into a string representation….

Problem Statement (Asked By Stripe) You are given an array of integers. Your task is to find the smallest missing…

Problem Statement (Asked By Jane Street) The function cons(a, b) creates a pair of two elements. Implement two functions: For…

An XOR-linked list is a memory-efficient version of a doubly linked list. Instead of each node storing separate next and…