Complete DSA Preparation Course

Make sure to ⭐ my DSA repo so you can keep up to date on any daily progress!

LeetCode | GeeksforGeeks

If you like this project, please leave me a star. ★

A little Contribution 💰Makes You Happy ❤️ (And me Also 😊)

dsa-course@upi

"For coding interview preparation, LeetCode & GeeksforGeeks is one of the best online resource providing a rich library of more than 500+ real coding interview questions for you "

Table of Contents

• Time Complexity
• Mathematics
• Bits Manipulation
• Recursion
• Arrays
• Searching
• Sorting
• Matrix
• Hashing
• String
• Linked List
• Stack
• Queue
• Tree
• Binary Search Tree
• Heap
• Graph
• Greedy
• Backtracking
• Dynamic Programming
• Trie

🟩 🟧 🟥

Mathematics

#	Title	Code	Document	Video	Difficulty	Tag
1	Absolute value		Theory		🟩 Easy	abs()
2	Celsius To Fahrenheit		Theory		🟩 Easy	Math
3	Roots of Quadratic equation		Theory		🟩 Easy	Math
4	Factorial Of Number				🟩 Easy	Math
5	Count digits in a factorial				🟩 Easy	Factorial, Math
6	Series GP				🟩 Easy	Basic Math
7	Prime Number				🟩 Easy	Basic Math
8	Exactly 3 Divisors		Theory		🟩 Easy	Basic Math
9	Addition Under Modulo		Theory		🟩 Easy	Modulo
10	Multiplication Under Modulo		Theory		🟩 Easy	Modulo
11	Modular Multiplicative Inverse				🟩 Easy	Modulo
12	Trailing zeroes in factorial				🟧 Medium	Logic
13	Prime Factors				🟧 Medium	Prime

Bits Manipulation

#	Title	Code	Document	Video	Difficulty	Tag
1	Find first set bit				🟩 Easy	Bits, Modulo
2	Rightmost different bit				🟩 Easy	XOR, Modulo
3	Check whether K-th bit is set or not				🟩 Easy	XOR, Modulo
4	Count total set bits				🟧 Medium	RIght shift
5	Bit Difference				🟩 Easy	Bits
6	Number is sparse or not				🟩 Easy	Bits
7	Longest Consecutive 1's				🟩 Easy	Bits
8	Gray Code				🟩 Easy	Xor, Right Shift
9	Gray to Binary equivalent				🟩 Easy	Xor, Right Shift
10	Power of 2				🟩 Easy	AND
11	Swap all odd and even bits				🟩 Easy	OR
12	Maximum AND Value				🟧 Medium	AND

Recursion

#	Title	Code	Document	Video	Difficulty	Tag
1	Print 1 to n without using loops				🟩 Easy	Recursion
2	Sum Of Digits				🟩 Easy	Recursion
3	Count Total Digits in a Number				🟩 Easy	Recursion
4	Digital Root				🟧 Medium	Recursion
5	Fibonacci Using Recursion				🟩 Easy	Recursion
6	Tower Of Hanoi				🟧 Medium	Recursion
7	Josephus problem				🟧 Medium	Recursion

Arrays

#	Title	Code	Document	Video	Difficulty	Tag
1

Searching

#	Title	Code	Document	Video	Difficulty	Tag
1

Sorting

#	Title	Code	Document	Video	Difficulty	Tag
1

Matrix

#	Title	Code	Document	Video	Difficulty	Tag
1	What is Multidimensional Arrays c++		Pdf	Video	🟩 Easy	Matrix, Array
2	Sum of upper and lower triangles		Pdf	Solution	🟩 Easy	Matrix, Array
3	Transpose of Matrix		Pdf	Solution	🟩 Easy	Matrix, Array
4	Rotate by 90 degree		Pdf	Solution	🟩 Easy	Matrix, Array
5	Multiply the matrices	c++	Pdf	Solution	🟩 Easy	Matrix, Array
6	Spirally traversing a matrix	c++	Pdf	Solution	🟧 Medium	Matrix, Array
7	Interchanging the rows of a Matrix	c++	Pdf	Solution	🟩 Easy	Matrix, Array
8	Matrix Interchange			Practice	🟩 Easy	Matrix, Array
9	Search in a row-column sorted Matrix	c++	Pdf	Solution	🟧 Medium	Matrix, Array
10	Boolean Matrix	c++	Pdf	Solution	🟧 Medium	Matrix, Array

Hashing

#	Title	Code	Document	Video	Difficulty	Tag
1	What is Hashing Data structure		Pdf	Theory	🟩 Easy	Hashing
2	Code of Hashing in c++	c++	Pdf	Solution	🟩 Easy	Hashing
3	Direct Access Table		Pdf	Theory	🟩 Easy	Hash
4	What is Hash Function and collision		Pdf	Theory	🟩 Easy	Hash
5	What is chaining in collision handling		Pdf	Theory	🟩 Easy	Hashing
6	What is unordered_set	c++	Pdf	Theory	🟩 Easy	Hash
7	What is unordered_map	c++	GFG	Theory	🟩 Easy	Hash
8	Non Repeating Element	c++	Pdf	Solution	🟩 Easy	Hashing
9	First Repeating Element	c++	Pdf	Solution	🟩 Easy	Hashing
10	Union of two arrays			Practice	🟩 Easy	Hashing
11	Intersection of Two Arrays	c++	Pdf	Solution	🟩 Easy	unordered_set
12	Key Pair	c++	Pdf	Solution	🟩 Easy	unordered_map
13	Subarray with sum 0	c++	Pdf	Solution	🟧 Medium	unordered_set
14	Winner of an election	c++	Pdf	Solution	🟩 Easy	unordered_map
15	Pairs with Positive Negative values	c++	Pdf	Solution	🟩 Easy	map, Vector
16	Print Anagrams Together / Group Anagrams	c++	Pdf	Solution	🟧 Medium	unordered_map, string
17	Relative Sort Array / Sort an array according to the other	c++	Pdf	Solution	🟧 Medium	Map
18	Custom Sort String	c++	Pdf	Solution	🟧 Medium	map
19	Sort Array by Increasing Frequency	c++	Pdf	Solution	🟩 Easy	map, Lambda
20	Longest Consecutive Sequence			Practice	🟧 Medium	map

String

#	Title	Code	Document	Video	Difficulty	Tag
1	Naive Pattern Search			Important	🟩 Easy	Pattern
2	Implement strStr()	c++	pdf		🟩 Easy	Pattern
3	Binary String				🟩 Easy	string
4	Anagram				🟩 Easy	string
5	Check if string is rotated by two places				🟩 Easy	string
6	Check if strings are rotations of each other or not				🟩 Easy	string
7	Isomorphic Strings				🟩 Easy	string
8	Check if a string is Isogram or not				🟩 Easy	string
9	Keypad typing				🟩 Easy	string
10	Repeated Character				🟩 Easy	string
11	Non Repeating Character	c++		solution	🟧 Medium	string
12	Maximum Occuring Character				🟩 Easy	string
13	Remove common characters and concatenate				🟩 Easy	string
14	Reverse words in a given string				🟩 Easy	string
15	Sum of numbers in string	c++	pdf	solution	🟧 Medium	string
16	Pangram Checking				🟩 Easy	string
17	Minimum indexed character				🟩 Easy	string
18	Smallest window in a string containing all the characters of another string				🟧 Medium	string
19	Nth number made of prime digits				🟩 Easy	Prime, string

Linked List

#	Title	Code	Document	Video	Difficulty	Tag
1	Introduction to Linked list Playlist c++			Theory	🟩 Easy	Linked List
2	Data structures Competitive Programming			Theory	🟩 Easy	DSA
3	Arrays in Data Structures			Theory	🟩 Easy	Arrays
4	Pointers in C++ with code Practice			Theory	🟩 Easy	Pointers
5	Struct in c++			Theory	🟩 Easy	Struct

Stack

#	Title	Code	Document	Video	Difficulty	Tag
1	What is stack		GFG Link	Solution	🟩 Easy	Stack, Array
2	Implement stack using array				🟩 Easy	Stack, Array
3	Implement Stack using Linked List				🟩 Easy	Stack, Linked List
4	Implement Stack using Linked List				🟩 Easy	Stack, Linked List
5	Remove All Adjacent Duplicates In String				🟩 Easy	Stack, string
6	Remove All Adjacent Duplicates in String II				🟧 Medium	Stack, string
7	Valid Parentheses				🟩 Easy	Stack, string
8	Implement two stacks in an array				🟩 Easy	Stack, Array
9	Valid Parentheses				🟩 Easy	Stack, string
10	Get min at pop				🟩 Easy	Stack, Array
11	Min Stack				🟩 Easy	Stack, Array
12	Delete middle element of a stack				🟩 Easy	Stack, STL
13	Infix to Postfix				🟩 Easy	Stack
14	Evaluate Reverse Polish Notation				🟧 Medium	Stack, Evaluation of Postfix Expression
15	Online Stock Span				🟧 Medium	Stack, Stock span problem
16	Next Greater Element II				🟧 Medium	Stack, Array
17	Largest Rectangle in Histogram				🟥 Hard	Stack, Array
18	The Celebrity Problem				🟧 Medium	Stack, Array

Queue

#	Title	Code	Document	Video	Difficulty	Tag
1	What is Queue		GFG Link	Solution	🟩 Easy	Queue, STL
2	Implement Queue using array				🟩 Easy	Queue, Array
3	Implement Queue using Linked List		Scaler Topics Link		🟩 Easy	Queue, Linked List
4	Queue Reversal				🟩 Easy	Queue, Stack
5	Queue using two Stacks				🟩 Easy	Queue, Stack
6	Implement Queue using Stacks				🟩 Easy	Stack, Queue
7	Stack using two queues				🟩 Easy	Stack, Queue
8	Generate Binary Numbers				🟩 Easy	Queue
9	Reverse First K elements of Queue				🟩 Easy	Queue, Stack
10	Circular tour				🟧 Medium	Queue, Sliding window

Tree

#	Question	Code	Document	Video	Difficulty	Tag
1	What is Tree		pdf	Solution1, solution2	🟩 Easy	Tree, Theory
2	What is Binary tree		pdf	solution	🟩 Easy	Tree, Binary Tree
3	How to code binary tree	c++		Solution	🟩 Easy	Tree, Code
4	Properties of Binary tree		pdf	solution	🟩 Easy	Tree, Node
5	Types of Binary tree		pdf	solution	🟩 Easy	Binary Tree
6	Tree Traversal		pdf	solution1, solution2	🟩 Easy	Traversal, Inorder
7	Code of Inorder Traversal	c++	pdf	solution	🟩 Easy	Inorder Traversal
8	Code of Preorder and Postorder	c++		Solution	🟩 Easy	Preorder, Postorder
9	Binary Tree Inorder Traversal	c++		Solution	🟩 Easy	Recursion, Tree
10	Binary Tree Preorder Traversal			Practice	🟩 Easy	Recursion, Tree
11	Binary Tree Postorder Traversal			Practice	🟩 Easy	Recursion, Tree
12	Same Tree	c++		Solution	🟩 Easy	Tree Traversal
13	Maximum Depth of Binary Tree	c++		Solution	🟧 Medium	Recursion, Tree
14	Children Sum Parent	c++		Solution	🟩 Easy	Recursion, Tree
15	Binary Tree Level Order Traversal	c++		Solution	🟧 Medium	Queue, Tree
16	Level order traversal Line by Line			Practice	🟩 Easy	stack, Tree
17	Binary Tree Zigzag Level Order Traversal	c++		Solution	🟧 Medium	Queue, Tree
18	Maximum Width of Tree				🟩 Easy	Tree
19	Balanced Binary Tree	c++		Solution	🟩 Easy	Tree
20	Left View of Binary Tree				🟩 Easy	Tree
21	Right View of Binary Tree				🟩 Easy	Tree
22	Lowest Common Ancestor in a Binary Tree				🟧 Medium	Tree
23	Diameter of Binary Tree				🟩 Easy	Tree
24	Vertical Width of a Binary Tree				🟩 Easy	Tree
25	Mirror Tree				🟩 Easy	Tree
26	Check if subtree				🟧 Medium	Tree
27	Make Binary Tree From Linked List				🟧 Medium	Tree

Binary Search Tree

#	Title	Code	Document	Video	Difficulty	Tag
1	Inorder traversal of a BST				🟩 Easy	BST, Tree
2	Search in a Binary Search Tree				🟩 Easy	BST, Tree

Heap

#	Title	Code	Document	Video	Difficulty	Tag
1	Heap sort			Solution	🟩 Easy	Heap Basic
2	Kth Largest Element in an Array			Solution	🟩 Easy	Heap Basic
3	Kth Largest Element in a Stream			Solution	🟩 Easy	Heap Basic
4	Top K Frequent Elements			Solution	🟩 Easy	Heap Basic
5	Minimum Cost of ropes			Solution	🟩 Easy	Heap Basic
6	Find K Closest Elements			Solution	🟧 Medium	Heap Medium
7	Merge k Sorted Arrays			Solution	🟧 Medium	Heap Medium
8	Find median in a stream			Solution	🟥 Hard	Heap Hard

Graph

#	Title	Code	Document	Video	Difficulty	Tag
1	Graph Introduction			Solution	🟩 Easy	Graph Theory
2	Adjacency Matrix in graph			Solution	🟩 Easy	Graph Basic
3	Adjacency List in graph			Solution	🟩 Easy	Graph
4	How to code graph			Solution	🟩 Easy	Graph
5	BFS Of Graph			Solution	🟩 Easy	Graph Theory
6	Find If Path Exists in Graph	C++		Solution	🟩 Easy	Graph BFS
7	Find the Town Judge	C++		Solution	🟩 Easy	Graph BFS
8	DFS Of Graph			Solution	🟩 Easy	Graph Theory
9	Number of Islands	C++		Solution	🟧 Medium	Graph DFS
10	Flood Fill	C++		Solution	🟩 Easy	Graph Theory
11	Detect cycle in undirected graph			Solution	🟩 Easy	Graph
12	Topological sort (Kahn's BFS)	C++	Pdf	Solution	🟩 Easy	Graph
13	Topological sort using DFS	C++	Pdf	Solution	🟧 Medium	Graph DFS
14	Detect Cycle in a Directed Graph	C++	Pdf	Solution	🟧 Medium	Graph GFG

Greedy

#	Title	Code	Document	Video	Difficulty	Tag
1

Backtracking

#	Title	Code	Document	Video	Difficulty	Tag
1

Dynamic Programming

#	Title	Code	Document	Video	Difficulty	Tag
1	Fibonacci Numbers - Top Down DP				🟩 Easy	Recursion

Trie

#	Title	Code	Document	Video	Difficulty	Tag
1	Insert and Search				🟧 Medium	Trie

📘  License

The Whole content management system is released under the under terms of the MIT License.

Connect with us ~Prince

Do star, fork and share the repo to show your support, it would help others too!

Let me know your views on the repository or any changes or improvements at LinkedIn, Telegram

❤️ Thank you all for Forking this repository ❤️