🧠 DSA-PRACTICE — Data Structures & Algorithms in C++

A structured, actively maintained repository of DSA problem solutions, topic-wise implementations, LeetCode daily challenges, pattern cheat sheets, and interview prep resources — all written in C++.

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📋 Table of Contents

• Overview
• Repository Structure
• Topics Covered
• Resources Included
• How to Use
• Progress Tracker
• Coding Profiles

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🌟 Overview

This repository is my personal DSA learning hub — a single place where I track every problem solved, every pattern learned, and every mistake made. It includes topic-wise C++ implementations, LeetCode daily question solutions, a hand-crafted DSA patterns cheat sheet, and a detailed interview prep tracker.

📊 Ranked top 15% in DSA cohort after 120+ hours of intensive training.

The goal is simple: go from understanding to mastery — one problem at a time.

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📁 Repository Structure

DSA-PRACTICE/
├── 1. ARRAYS/                      # Array problems and implementations
├── 2. Stacks/                      # Stack problems and implementations
├── Recursion/                      # Recursion problems and patterns
├── LeetCodeDailyQu.c++             # LeetCode daily challenge solutions
├── DSA patterns Cheat Sheet.xlsx   # Master cheat sheet of all DSA patterns
├── DSA_Interview_Prep_v2.xlsx      # Interview preparation tracker (v2)
├── LEET CODE ERRORS.docx           # Personal error log & lessons learned
└── .vscode/                        # Editor settings

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📚 Topics Covered

#	Topic	Status
1	Arrays	✅ In Progress
2	Stacks	✅ In Progress
3	Recursion	✅ In Progress
4	Linked Lists	✅ In Progress
5	Trees & BST	🔜 Coming Soon
6	Graphs	🔜 Coming Soon
7	Dynamic Programming	🔜 Coming Soon
8	Sorting & Searching	✅ In Progress
9	Queues & Deques	✅ In Progress
10	Heaps & Priority Queues	✅ In Progress
11	Hashing	✅ In Progress
12	Greedy Algorithms	🔜 Coming Soon
13	Backtracking	🔜 Coming Soon
14	Tries	🔜 Coming Soon

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📦 Resources Included

📊 DSA Patterns Cheat Sheet (DSA patterns Cheat Sheet.xlsx)

A comprehensive reference sheet covering all major DSA problem-solving patterns — sliding window, two pointers, fast & slow pointers, merge intervals, cyclic sort, binary search variations, BFS/DFS, dynamic programming patterns, and more. Built from scratch during active problem-solving sessions.

📋 Interview Prep Tracker v2 (DSA_Interview_Prep_v2.xlsx)

A structured spreadsheet tracking problems by topic, difficulty, platform (LeetCode / GFG / HackerRank), status, and revision notes. Designed to make sure no topic gets missed before interviews.

❌ LeetCode Errors Log (LEET CODE ERRORS.docx)

A personal log of mistakes made while solving LeetCode problems — wrong approaches, edge cases missed, off-by-one errors, and the correct solutions. This is one of the most valuable files in the repo: learning from mistakes faster than re-solving problems.

💻 LeetCode Daily Solutions (LeetCodeDailyQu.c++)

Solutions to LeetCode daily challenge problems, written in C++ with comments explaining the approach and time/space complexity.

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🚀 How to Use

Clone the Repository

git clone https://github.com/Swarajbabu/DSA-PRACTICE.git
cd DSA-PRACTICE

Compile & Run a C++ File

g++ -o solution filename.c++ && ./solution

Or use VS Code

Open the folder in VS Code — the .vscode settings are already configured for C++ compilation.

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📈 Progress Tracker

Platform	Profile	Stats
LeetCode	swarajvecha	Top 15% in DSA cohort
GeeksForGeeks	swarajvecha	Active
HackerRank	syamalaswaraj	Active

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🎯 Problem-Solving Approach

Every problem in this repo follows a consistent approach before writing code:

1. Understand   →  Read carefully, identify input/output
2. Examples     →  Trace through 2-3 examples manually
3. Pattern      →  Identify which DSA pattern applies
4. Brute Force  →  Think of the naive O(n²) or O(n³) solution first
5. Optimise     →  Reduce to optimal time/space complexity
6. Code         →  Write clean, commented C++ solution
7. Test         →  Verify edge cases (empty, single element, negatives)
8. Log          →  Note any mistakes in LEET CODE ERRORS.docx

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👤 Author

Swaraj Babu

• GitHub: @Swarajbabu
• Portfolio: swarajvecha.in
• LinkedIn: laxmiswarajbabu

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📄 License

This repository is for personal learning and reference. Feel free to use the cheat sheets and patterns for your own preparation.

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"DSA is not about memorising solutions — it's about recognising patterns."

⭐ Star this repo if it helps your prep!