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Data Structures & Algorithms Repository

This repository contains implementations of various data structures and solutions to coding problems, primarily from LeetCode. It serves as a comprehensive collection of fundamental computer science concepts and algorithmic problem-solving techniques.

📁 Repository Structure

Core Data Structures

  • BinaryTree.java - Binary tree implementation with basic operations
  • CircularLinkedList.java - Circular linked list implementation
  • DoublyLinkedList.java - Doubly linked list with forward and backward traversal
  • singlyLinkedList.Java - Basic singly linked list implementation
  • Queue.java - Queue data structure implementation
  • Stack.java - Stack implementation with standard operations
  • StackUsingArray.java - Array-based stack implementation

Algorithm Implementations

  • NextGreaterElement.java - Finding next greater element in arrays
  • ReverseStringInStack.java - String reversal using stack

LeetCode Solutions

The Leetcode/ folder contains solutions to various LeetCode problems organized by categories:

Array & String Problems

  • Two Sum, Three Sum
  • Best Time to Buy and Sell Stock (I & II)
  • Move Zeroes, Rotate Array
  • Valid Palindrome, Valid Anagram
  • Group Anagrams, First Unique Character
  • And many more...

Linked List Problems

  • Reverse Linked List
  • Remove Nth Node from End
  • Delete Middle Node
  • Merge K Sorted Lists

Binary Tree Problems

  • In-order, Pre-order, Post-order Traversals
  • Tree node implementation

Binary Search Problems

  • Find Smallest Letter Greater Than Target

🚀 Getting Started

This repository is written in Java. To run any of the implementations:

  1. Clone the repository
  2. Compile the Java files using javac
  3. Run the desired program using java

Example:

javac BinaryTree.java
java BinaryTree

📚 Purpose

This repository serves as:

  • A reference for common data structure implementations
  • Practice solutions for coding interviews
  • Study material for algorithms and data structures
  • A collection of LeetCode problem solutions with explanations

🤝 Contributing

Feel free to add more data structure implementations or LeetCode solutions. Make sure to follow consistent coding style and add appropriate comments.

📝 Notes

Each implementation focuses on clarity and educational value, making it easy to understand the underlying concepts and algorithms.