ds-algo-solutions

A collection of solutions for HackerRank data structures and algorithm problems in Python, JAVA, and CPP. This community-owned project aims to bring together the solutions for the DS & Algo problems across various platforms, along with the resources for learning them. Problems from Leetcode will be included soon in the project.

Contribution Instructions

Please read contribution guidelines for contributing to the project.

HackerRank

HackerRank is a place where programmers from all over the world come together to solve problems in a wide range of Computer Science domains such as algorithms, machine learning, or artificial intelligence, as well as to practice different programming paradigms like functional programming.

Topic	Question	Difficulty	CPP	JAVA	Python
Arrays
	2D Array-DS	Easy	View	View	View
	Dynamic Array	Easy	View	View	View
	Left Rotation	Easy	View	View	View
	Arrays-DS	Easy	View	View	View
	Sparse Arrays	Medium	View	View	View
	Array Manipulation	Hard	View	View	View
Linked Lists
	Print the Elements of a Linked List	Easy	View	View	View
	Insert a node at the head of a linked list	Easy	View	View	View
	Insert a Node at the Tail of a Linked List	Easy	View	View	View
	Insert a node at a specific position in a linked list	Easy	View	View	View
	Delete a Node	Easy	View	View	View
	Print in Reverse	Easy	View	View	View
	Compare two linked lists	Easy	View	View	View
	Merge two sorted linked lists	Easy	View	View	View
	Get Node Value	Easy	View	View	View
	Reverse a linked list	Easy	View	View	View
	Delete duplicate-value nodes from a sorted linked list	Easy	View	View	View
	Find Merge Point of Two Lists	Easy	View	View	View
	Cycle Detection	Easy	View	View	View
	Inserting a Node Into a Sorted Doubly Linked List	Easy	View	View	View
	Reverse a doubly linked list	Easy	View	View	View
Stacks
	Maximum Element	Medium	View	View	View
	Balanced Brackets	Medium	View	View	View
	Equal Stacks	Medium	View	View	View
	Largest Rectangle	Medium		View	View
	Simple Text Editor	Medium		View	View
	Waiter	Medium		View	View
Queues
	Queue using Two Stacks	Medium	View		View
	Castle on the Grid	Medium	View		View
	Down to Zero II	Medium	View		View
Heap
	QHEAP1	Easy	View
	Jesse and Cookies	Easy	View	View	View
	Find the Running Median	Hard	View	View	View
Trees
	Tree : Top View	Easy	View
	Tree: Preorder Traversal	Easy	View	View	View
	Tree: Inorder Traversal	Easy	View	View	View
	Tree: Postorder Traversal	Easy	View	View	View
	Tree: Level Order Traversal	Easy	View	View	View
	Tree: Height of a Binary Tree	Easy	View	View	View
	Binary Search Tree : Insertion	Easy	View	View	View
	Binary Search Tree : Lowest Common Ancestor	Easy	View	View
	Is This a Binary Search Tree?	Medium	View	View
	Swap Nodes [Algo]	Medium	View	View
	Tree: Huffman Decoding	Medium	View		View
	Balanced Forest	Hard			View
	Kitty's Calculations on a Tree	Advanced	View		View
Algorithms
	Grading Students	Easy	View	View	View
	Apple and Orange	Easy	View		View
	Number Line Jumps	Easy	View		View
	Encryption	Medium			View
	Breaking the Records	Easy	View	View
	Sales by Match	Easy	View	View
	Climbing the Leaderboard	Medium	View	View	View
	Diagonal Difference	Easy	View
	Queen's Attack II	Medium	View
	Electronics Shop	Easy	View	View	View
	The Coin change problem	Medium	View	View	View
	Angry Professor	Easy	View	View	View
	Migratory Birds	Easy	View	View	View
	Mini-Max Sum	Easy	View	View	View
	Dorsey Thief	Advanced	View	View
	Luck Balance	Easy	View
	The Great XOR	Medium	View	View
	Sansa and XOR	Medium	View	View
	Xor sequence	Medium	View	View
	Bigger is Greater	Medium		View	View
	Sherlock and the Valid String	Medium		View
	Lonely Integer	Easy		View	View
	Sum vs XOR	Easy		View	View
	Maximizing XOR	Easy		View	View
	Birthday Cake Candles	Easy	View	View	View
	Sub-array Division	Easy	View	View	View
	Bill Division	Easy	View	View	View
	Marc's Cakewalk	Easy	View	View
	Flipping Bits	Easy	View	View	View
	The Longest Common Subsequence	Medium	View	View	View
	Halloween Sale	Easy	View	View	View
	Chocolate Feast	Easy	View	View	View
	Save the Prisoner	Easy		View	View
	Library Fine	Easy			View
	Non-Divisible Subset	Medium		View	View
	Minimum Average Waiting Time	Hard			View
	Minimum Loss	Medium		View	View
Contest Problems
	Squares of a Sorted Array	Medium	View		View
	Diagonal Difference	Easy	View	View	View
	Viral Advertising	Easy		View	View
	Minimum Absolute Difference in an Array	Medium	View		View
	Organizing Containers of Balls	Easy		View
Disjoint Sets
	Merging Communities	Easy	View	View	View
	Components in a Graph	Medium	View
	Super Maximum Cost Queries	Hard	View	View	View

A cool & collective resource🔻

https://drive.google.com/file/d/1FMdN_OCfOI0iAeDlqswCiC2DZzD4nPsb/view?usp=sharing