My LeetCode Solutions

This repository contains my solutions to various LeetCode problems, organized by categories and topics.

🎯 Purpose

• Practice algorithms and data structures
• Improve problem-solving skills
• Track progress on LeetCode problems
• Build a comprehensive reference for coding interviews

💻 Languages Used

• Python3 (Primary) - Algorithm problems
• SQL - Database problems

📁 Repository Structure

Algorithm Problems

• problem_list/ - Individual problems organized by problem number
• leetcode_75/ - LeetCode Top Interview 75 questions organized by topic.
  • Array / String
  • Two Pointers
  • Sliding Window
  • Prefix Sum
  • Hash Map / Set
  • Stack
  • Queue
  • Linked List
  • Binary Tree - DFS
  • Binary Tree - BFS
  • Binary Search Tree
  • Graphs - DFS
  • Graphs - BFS
  • Heap / Priority Queue
  • Binary Search
  • Backtracking
  • DP - 1D
  • DP - Multidimensional
  • Bit Manipulation
  • Trie
  • Intervals
  • Monotonic Stack
• top_interview_150/ - LeetCode Top Interview 150 questions organized by topic.
  • Array / String
  • Two Pointers
  • Sliding Window
  • Matrix
  • Hashmap
  • Intervals
  • Stack
  • Linked List
  • Binary Tree General
  • Binary Tree BFS
  • Binary Search Tree
  • Graph General
  • Graph BFS
  • Trie
  • Backtracking
  • Divide & Conquer
  • Kadane's Algorithm
  • Binary Search
  • Heap
  • Bit Manipulation
  • Math
  • 1D DP
  • Multidimensional DP

SQL Problems

• sql/ - Database problems categorized by difficulty and topic.
  • Select - Basic SELECT queries
  • Basic Joins - JOIN operations
  • Advanced Select and Joins - Complex JOIN scenarios
  • Basic Aggregate Functions - COUNT, SUM, AVG, etc.
  • Sorting and Grouping - ORDER BY, GROUP BY, HAVING
  • Subqueries - Nested queries and complex analysis
  • Advanced String Functions & Regex - Text processing

🚀 How to Navigate

By Problem Type

• Algorithm Practice: Browse problem_list/ for individual problems or top_interview_150/ by topic
• SQL Practice: Explore sql/ directory organized by SQL concepts

By Difficulty

• Each directory contains problems of mixed difficulties
• Problem numbers indicate original LeetCode problem IDs

File Organization

• Each problem includes:
  • Solution code with detailed comments
  • Problem statement and examples
  • README.md with explanation (for complex problems)

🛠️ Development Environment

• Python 3.x with virtual environment (.venv/)
• SQL solutions tested on MySQL/PostgreSQL
• VS Code configuration included (.vscode/)

---

💡 Feel free to explore and learn from these solutions!

📝 Note: Solutions include detailed explanations and multiple approaches where applicable.