A 90-day public challenge to master DSA, logic building, and problem-solving using Java.

90 Days of Java DSA & Logic Building is a structured, self-driven challenge focused on strengthening logical thinking, mastering Data Structures & Algorithms, and improving problem-solving skills using Java.

Rather than memorizing solutions, this project emphasizes:

• breaking problems into logical steps
• understanding why a solution works
• writing clean, readable, and interview-ready Java code

The repository is public to demonstrate consistency, discipline, and growth over time.

• Build strong logic-building fundamentals
• Apply Java concepts through real problem-solving
• Master core DSA topics from basics to advanced
• Prepare effectively for technical interviews
• Maintain daily coding consistency

• Language: Java
• Tools: VS Code
• Version Control: Git & GitHub

JavaDSA90/
│
├── Week01_Basics_Logic/
├── Week02_Arrays/
├── Week03_Strings/
├── Week04_Recursion_Backtracking/
├── Week05_Sorting_Searching/
├── Week06_LinkedList/
├── Week07_Stack_Queue/
├── Week08_Trees/
├── Week09_BST/
├── Week10_Heaps_Hashing/
├── Week11_Graphs/
├── Week12_DP/
├── Week13_Revision_Interview/
│
├── Utils/
│   └── FastIO.java
│
└── Notes/
    └── concepts.md

/**
 * Problem Name:
 * Source:
 * Difficulty:
 *
 * Approach:
 * - Step-by-step logic explanation
 *
 * Time Complexity:
 * Space Complexity:
 */

public class ProblemName {
    public static void main(String[] args) {
        // Test cases
    }

    public static void solve() {
        // Core logic here
    }
}

Format used:

Day 21 | Trees | Solved 3 traversal problems

This ensures clarity, consistency, and easy progress tracking.

• No zero days — even one problem counts
• Logic first, optimization later
• Clean and readable Java code
• Regular revision and refactoring

• Status: 🟢 Successfully Completed !
• Progress: Week 13 / 13 ( Day 91 / 90 ) Successfully Completed !

This project reflects my commitment to continuous learning, logical thinking, and interview readiness.

If you find this useful:

• ⭐ Star the repository
• 🍴 Fork it
• 💬 Share feedback

Let’s build logic — one problem at a time. 💪