DSA-PRACTICE

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C++ DSA solutions — Arrays, Stacks, Recursion,..etc LeetCode daily challenges, a DSA patterns cheat sheet, and an interview prep tracker. Top 15% in DSA cohort.

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# 🧠 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++.

![C++](https://img.shields.io/badge/C++-Solutions-00599C?style=for-the-badge&logo=c%2B%2B&logoColor=white)
![LeetCode](https://img.shields.io/badge/LeetCode-Daily-FFA116?style=for-the-badge&logo=leetcode&logoColor=black)
![DSA](https://img.shields.io/badge/DSA-Interview%20Prep-8A2BE2?style=for-the-badge)
![Status](https://img.shields.io/badge/Status-Active-brightgreen?style=for-the-badge)

---

## 📋 Table of Contents

- [Overview](#-overview)
- [Repository Structure](#-repository-structure)
- [Topics Covered](#-topics-covered)
- [Resources Included](#-resources-included)
- [How to Use](#-how-to-use)
- [Progress Tracker](#-progress-tracker)
- [Coding Profiles](#-coding-profiles)

---

## 🌟 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.

---

## 📁 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
```

---

## 📚 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 |

---

## 📦 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.

---

## 🚀 How to Use

### Clone the Repository
```bash
git clone https://github.com/Swarajbabu/DSA-PRACTICE.git
cd DSA-PRACTICE
```

### Compile & Run a C++ File
```bash
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.

---

## 📈 Progress Tracker

| Platform | Profile | Stats |
|---|---|---|
| **LeetCode** | [swarajvecha](https://leetcode.com/u/swarajvecha/) | Top 15% in DSA cohort |
| **GeeksForGeeks** | [swarajvecha](https://www.geeksforgeeks.org/user/swarajvecha/) | Active |
| **HackerRank** | [syamalaswaraj](https://www.hackerrank.com/profile/syamalaswaraj) | Active |

---

## 🎯 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
```

---

## 👤 Author

**Swaraj Babu**
- GitHub: [@Swarajbabu](https://github.com/Swarajbabu)
- Portfolio: [swarajvecha.in](https://swarajvecha.in/)
- LinkedIn: [laxmiswarajbabu](https://www.linkedin.com/in/laxmiswarajbabu/)

---

## 📄 License

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

---

> *"DSA is not about memorising solutions — it's about recognising patterns."*
>
> ⭐ Star this repo if it helps your prep!

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