Javarena: Data Structures & Algorithms in Java

Welcome to Javarena – a comprehensive, Java-based repository crafted to help you master coding interviews with carefully curated DSA problems organized by topics and companies.

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📌 Table of Contents

• 🎯 Overview
• 📁 Project Structure
• 📘 DSA Topics
• 🏢 Company-Wise Problems
• 🚀 Getting Started
• 🏷️ Badges

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🎯 Overview

This repository includes:

• ✅ Data Structures & Algorithms (DSA) – Comprehensive topic-wise and company-wise curated problems from **LeetCode **, GeeksforGeeks, and more
• 🏢 Company-Wise Tracking – Solved and categorized interview problems for top tech companies like Amazon, Adobe, Google, Microsoft, and many others
• 📊 Progress Tracking – Built-in topic suggester to help you practice consistently

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📁 Project Structure

src/main/java/com/javarena/dsa/
├── algorithms/              # Algorithm implementations & problems
│   ├── binarySearch/       # Binary search problems
│   ├── bitManupulation/    # Bit manipulation problems
│   ├── dynamicProgramming/ # DP problems
│   ├── greedy/             # Greedy algorithm problems
│   ├── recursionAndBacktracking/ # Recursion & backtracking
│   ├── string/             # String algorithms (KMP, etc.)
│   ├── twoPointerAndSlidingWindow/ # Two pointer problems
│   └── miscellaneous/      # Other algorithm problems
│
├── datastructures/         # Data structure implementations
│   ├── arrays/            # Array problems
│   ├── binaryTree/        # Binary tree problems
│   ├── graph/             # Graph algorithms
│   ├── linkedList/        # Linked list problems
│   ├── stackAndQueue/     # Stack & queue problems
│   ├── string/            # String data structure problems
│   ├── trie/              # Trie implementations
│   ├── segmentTree/       # Segment tree
│   ├── fenwickTree/       # Fenwick tree (BIT)
│   └── hashMapAndSet/     # HashMap & HashSet problems
│
├── companies/             # Company-wise problem tracking (386 companies)
│   ├── Amazon.md
│   ├── Google.md
│   ├── Microsoft.md
│   └── ... (and many more)
│
└── utils/                 # Utility classes
    ├── Main.java          # Main entry point
    └── TopicSuggester.java # Daily topic suggestion tool

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📘 DSA Topics

Algorithms

#	Topic
1	Binary Search
2	Bit Manipulation
3	Dynamic Programming
4	Greedy Algorithms
5	Recursion & Backtracking
6	String Algorithms
7	Two Pointer
8	Sliding Window

Data Structures

#	Topic
1	Arrays
2	Linked List
3	Stack & Queue
4	Binary Tree
5	Graph
6	Trie
7	Segment Tree
8	Fenwick Tree

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🏢 Company-Wise Problems

Solve company-tagged questions like real interviews and track your progress here:

Company	File
Amazon	Amazon.md
Adobe	Adobe.md
Google	Google.md
Microsoft	Microsoft.md
Meta	Meta.md
Apple	Apple.md
+380 More...	📁 View all companies

Each file contains:

• 🎯 Problem link
• 📂 Solution file path
• ⚡️ Difficulty & topic tags

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🚀 Getting Started

Clone the Repository

git clone https://github.com/piyush7199/javarena-dsa.git
cd javarena-dsa

Build with Maven

mvn clean compile

Run Topic Suggester

mvn exec:java -Dexec.mainClass="com.javarena.dsa.utils.TopicSuggester"

IDE Setup

Open in your favorite IDE:

• IntelliJ IDEA: File → Open → Select project directory
• VS Code: Install Java Extension Pack, then open project directory
• Eclipse: File → Import → Maven → Existing Maven Projects

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🏷️ Badges