✨DS - ALGO - SOLUTIONS✨

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Table of Contents

• About The Project
• Contribution Instructions
• HackerRank Solutions
• A cool & collective resource
• Contributors
• Open source Events

About the project

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	Easy	View	View	View
	Balanced Brackets	Medium	View	View	View
	Equal Stacks	Easy	View	View	View
	Largest Rectangle	Medium	View	View	View
	Simple Text Editor	Medium	View	View	View
	Waiter	Medium	View	View	View
	Poisonous Plants	Hard	View	View	View
	AND xor OR	Hard	View	View	View
Queues
	Queue using Two Stacks	Medium	View	View	View
	Castle on the Grid	Medium	View	View	View
	Down to Zero II	Medium	View	View	View
	Truck Tour	Hard	View	View	View
	Queries with Fixed Length	Hard	View	View	View
Heap
	QHEAP1	Easy	View	View	View
	Jesse and Cookies	Easy	View	View	View
	Find the Running Median	Hard	View	View	View
	Minimum Average Waiting Time	Hard	View	View	View
Trees
	Tree - Top View	Easy	View	View	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	View
	Is This a Binary Search Tree	Medium	View	View	View
	Swap Nodes [Algo]	Medium	View	View	View
	Tree - Huffman Decoding	Medium	View	View	View
	Tree: Square-Ten Tree	Hard	View	View	View
	Balanced Forest	Hard	View	View	View
	Kitty's Calculations on a Tree	Advanced	View	View	View
Trie
	Contacts	Medium	View	View	View
	No Prefix Set	Hard	View	View	View
Algorithms
	Mark and Toys	Easy	View	View	View
	Grading Students	Easy	View	View	View
	Apple and Orange	Easy	View	View	View
	Number Line Jumps	Easy	View	View	View
	Encryption	Medium	View	View	View
	Cut the sticks	Easy	View	View	View
	Breaking the Records	Easy	View	View	View
	Sales by Match	Easy	View	View	View
	Climbing the Leaderboard	Medium	View	View	View
	Diagonal Difference	Easy	View	View	View
	Queen's Attack II	Medium	View	View	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	View
	Luck Balance	Easy	View	View	View
	Fair Cut	Medium	View	View	View
	Prime XOR	Medium	View	View	View
	The Great XOR	Medium	View	View	View
	Sansa and XOR	Medium	View	View	View
	Xor-sequence	Medium	View	View	View
	Sherlock and the Valid String	Medium	View	View	View
	Bigger is Greater	Medium	View	View	View
	Utopian Tree	Easy	View	View	View
	Sequence Equation	Easy	View	View	View
	Find Digits	Easy	View	View	View
	Modified Kaprekar Numbers	Easy	View	View	View
	Taum and B'day	Easy	View	View	View
	Jumping on the Clouds	Easy	View	View	View
	Repeated String	Easy	View	View	View
	Jim and the Orders	Easy	View	View	View
	AND Product	Medium	View	View	View
	Sherlock and Array	Easy	View	View	View
	Ice Cream Parlor	Easy	View	View	View
	Missing Numbers	Easy	View	View	View
	Sherlock and The Beast	Easy	View	View	View
	Permuting Two Arrays	Easy	View	View	View
	Insertion Sort - Part 1	Easy	View	View	View
	Insertion Sort - Part 2	Easy	View	View	View
	Counting Sort 2	Easy	View	View	View
	Making Anagrams	Easy	View	View	View
	The Love-Letter Mystery	Easy	View	View	View
	Beautiful Binary String	Easy	View	View	View
	HackerRank in a String!	Easy	View	View	View
	Funny String	Easy	View	View	View
	Gemstones	Easy	View	View	View
	Pangrams	Easy	View	View	View
	Largest Permutation	Easy	View	View	View
	Running Time of Algorithms	Easy	View	View	View
	Correctness and the Loop Invariant	Easy	View	View	View
	The Hurdle Race	Easy	View	View	View
	Designer PDF Viewer	Easy	View	View	View
	The Power Sum	Medium	View	View	View
	Crossword Puzzle	Medium	View	View	View
	Closest Numbers	Easy	View	View	View
	CamelCase	Easy	View	View	View
	Lonely Integer	Easy	View	View	View
	Sum vs XOR	Easy	View	View	View
	Maximizing XOR	Easy	View	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	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	View
	Library Fine	Easy	View	View	View
	Non-Divisible Subset	Medium	view	View	View
	Candies	Medium	View	View	View
	3-D Surface Area	Medium	View	View	View
	Viral Advertising	Easy	View	View	View
	Minimum Loss	Medium	View	View	View
	Minimum Absolute Difference in an Array	Medium	View	View	View
	Beautiful Pairs	Easy	View	View	View
	Greedy Florist	Medium	View	View	View
	Priyanka and Toys	Easy	View	View	View
	Compare the Triplets	Easy	View	View	View
	ACM ICPC Team	Easy	View	View	View
	Beautiful Days at the Movies	Easy	View	View	View
	Fibonacci Modified	Medium	View	View	View
	Knapsack	Medium	View	View	View
	The Bomberman Game	Medium	View	View	View
	Organizing Containers of Balls	Easy	View	View	View
	Two Strings	Easy	View	View	View
	Game of Thrones - I	Easy	View	View	View
	String Construction	Easy	View	View	View
	Highest Value Palindrome	Medium	View	View	View
	Lily's Homework	Medium	View	View	View
	Caesar Cipher	Easy	View	View	View
	Two Characters	Easy	View	View	View
	Weighted Uniform Strings	Easy	View	View	View
	Manasa and Stones	Easy	View	View	View
	Happy Ladybugs	Easy	View	View	View
	Cavity Map	Easy	View	View	View
	Big Sorting	Easy	View	View	View
	Quicksort 1 - Partition	Easy	View	View	View
	Reverse Shuffle Merge	Advanced	View	View	View
	Goodland Electricity	Medium	View	View	View
	Max Min	Medium	View	View	View
	Super Reduced String	Easy	View	View	View
	Strong Password	Easy	View	View	View
	Drawing Book	Easy	View	View	View
	Lisa's Workbook	Easy	View	View	View
	Append and Delete	Easy	View	View	View
	Day of the Programmer	Easy	View	View	View
	Picking Numbers	Easy	View	View	View
	A Chessboard Game	Easy	View	View	View
	Game of Stones	Easy	View	View	View
	Tower Breakers	Easy	View	View	View
	Circular Array Rotation	Easy	View	View	View
	Separate the Numbers	Easy	View		View
	Palindrome Index	Easy	View		View
	Counting Sort 1	Easy	View	View	View
	Find the Median	Easy	View	View	View
	Red John is Back	Medium	View	View	View
	Stock Maximize	Medium	View	View	View
	Between Two Sets	Easy	View	View	View
	Circular Array Rotation	Easy		View	View
	Solve Me First	Easy	View	View	View
	Simple Array Sum	Easy	View	View	View
	A Very Big Sum	Easy	View	View	View
	Staircase	Easy	View	View	View
	Plus Minus	Easy	View	View	View
	Time Conversion	Easy	View	View	View
	Divisible Sum Pairs	Easy	View	View	View
	Flatland Space Stations	Easy	View	View	View
	Nimble Game	Easy	View	View	View
	Misère Nim	Easy	View	View	View
	Introduction to Nim Game	Easy	View	View	View
	Alice and Bob's Silly Game	Medium	View	View	View
	Tower Breakers, Revisited!	Medium	View	View	View
	Poker Nim	Easy	View	View	View
	Tower Breakers, Again!	Medium	View		View
	Zero-Move Nim	Medium			View
	Chessboard Game, Again!	Medium			View
	Almost Sorted	Medium		View	View
	Sherlock and Anagrams	Medium		View	View
Contest Problems
	Squares of a Sorted Array	Medium	View	View	View
Disjoint Sets
	Merging Communities	Easy	View	View	View
	Components in a Graph	Medium	View	View	View
	Super Maximum Cost Queries	Hard	View	View	View
	Kundu and Tree	Hard	View	View	View

A cool and collective resource

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Contributors

✨ Thanks goes to these wonderful people (emoji key):

Aditya Bisoi 🤔 💻 🚧	anushkasinghal11 💻	Nivedita Singh 💻	Aarushi Hans 💻	Uttam Mittal 💻	Yashasvi Misra 💻	Abhay Singh Yadav 💻
Vivekkumar Javiya 💻	Satyam Pandey 💻	vikhyat singh 💻	Manisha Agarwal 💻	Prashant Jangid 💻	mustang519 💻	vikasahlawat228 💻
Sourav Sukumaran 💻	RonyFromIITKGP 💻	Itish Agarwal 💻	Sakshay-gupta 💻	DHRUV RATHI 💻	Tanvi Wakade 💻	suhas142 💻
satyam20-sys 💻	Pratyush Kumar Swain 💻	RISHAV KUMAR 💻	Chirag Ghosh 💻	Aditya Tewary 💻	Mintu Agarwal 💻	Prakhar Pratyush 💻
JAISAIKRISHNAN 💻	Aastha Asthana 💻	Uddeshya Tyagi 💻	shash-2468 💻	Ankita Saloni 💻	Arihant Bansal 💻	Md Raza Khan 💻
Pranayan Metiya 💻	Devansh Shukla 💻	devELIOper 💻	Avinash Vijayvargiya 💻	Rishika Wadhera 💻	RisHaV-IITKGP 💻	Dinesh Hardasani 💻
Ansh Sarkar 💻	R Srinath 💻	im-krishna 💻	Md Areeb Hussain 💻	yashshah14093 💻	SomyaGandhi 💻	Shreya 💻
D3xter1922 💻	sanyajain26 💻	preyam2002 💻	Jayanth PSY 💻	Dolly Jain 💻	Vrinda Gupta 💻	Hari Krishnan U 💻
Subhangi Choudhary 💻	sai-vamshi-18 💻	The Gitter Badger 💻	driti924 💻	dolamanee6122 💻	Mannan Baidi 💻	aaditya-ag 💻
Shreyas More 💻

This project follows the all-contributors specification. Contributions of any kind welcome!

Help & support

If you are stuck somewhere or do not understand what to do, feel free to reach out to mentors in the official Gitter Channel.

Open Source Events