The DSA Handbook

Arrays: The Foundation of Data Structures Welcome to the world of arrays! 🗃️ Think of an array as a neatly organized shelf with numbered ...

Arrays: DSA Interview Prep Arrays are one of the most frequently tested data structures in technical interviews. Here are some classic pro...

Linked Lists: Types & Problem Solving A Linked List is a linear data structure, but unlike arrays, its elements are not stored at contiguo...

Master Stack & Queue Data Structures Stacks and Queues are abstract data types, often implemented using Arrays or Linked Lists. They are f...

Time Complexity and Big O Notation Time complexity is a way to analyze how the runtime of an algorithm grows as the size of the input grow...

Sorting Algorithms Explained Sorting is the process of arranging items in a certain order. It is one of the most fundamental problems in c...

Greedy Algorithms: Concepts & Problems A greedy algorithm is an algorithmic paradigm that builds up a solution piece by piece, always choo...

Two Pointers Technique This is a powerful technique, primarily used on arrays or strings, that can often reduce the time complexity of a p...

Prefix Sums for Range Queries The prefix sum technique is a powerful tool used to pre-calculate cumulative sums in an array. This allows f...

Binary Search: Fast Search for Sorted Data Binary search is a highly efficient searching algorithm that works on sorted d...

Recursive Code for Problem Solving Recursion is a powerful programming technique where a function calls itself to solve a problem. It's a ...

2D Array & Matrix Interview Practice A 2D array, or matrix, is an array of arrays. It's a fundamental structure for representing grids, ta...

Trees, BTs, BSTs: Problem Solving Trees are non-linear hierarchical data structures. They are incredibly important and form the basis for ...

Graph Algorithms A graph is a data structure consisting of a set of vertices (or nodes) and a set of edges connecting these vertices. Grap...

Heaps & Priority Queues A Heap is a specialized tree-based data structure that satisfies the heap property. It is a powerful tool for effi...

Bit Manipulation Bit manipulation involves working with the individual bits of a number's binary representation. It can lead to extremely ...

Dynamic Programming Dynamic Programming (DP) is a powerful algorithmic technique for solving optimization problems by breaking them down i...

Number Theory: Primes, Divisibility & Modulo Number theory is a branch of mathematics devoted primarily to the study of the integers. It h...

Combinatorics Combinatorics is an area of mathematics primarily concerned with counting, both as a means and an end in obtaining results, ...

Hashing: Create Hash Values & Solve Problems Hashing is the process of converting a given key (e.g., a string, an object) into another val...

Disjoint Set Union (DSU) The Disjoint Set Union (DSU) or Union-Find data structure is used to keep track of a set of elements partitioned ...

Tries (Prefix Trees) A Trie, also known as a prefix tree or digital tree, is a tree-like data structure that proves to be very efficient f...

Common Data Structures Interview Questions This module serves as a review, highlighting some of the most frequently asked questions in tec...