Erick Bárcenas
Software & Cloud Architect | AWS · GCP · AI · DevOps

This repository contains curated Medium and Hard LeetCode problems, organized by category and difficulty, with clean, well-documented solutions.

The goal of this repo is to:

• Strengthen algorithmic thinking
• Master common interview patterns
• Serve as a long-term reference for advanced problem solving

• Arrays & Dynamic Programming
• Sliding Window & Prefix Techniques
• Strings & Subsequence Problems
• Matrix / Grid Traversal
• Graphs & BFS / DFS
• Greedy & Optimization
• Advanced Data Structures

leetcode-advanced-patterns/
├── arrays/
│   ├── medium/
│   └── hard/
├── strings/
│   ├── medium/
│   └── hard/
├── matrix/
│   ├── medium/
│   └── hard/
└── utils/

Each solution includes:

• Problem description & LeetCode link
• Clear explanation of the approach
• Time & space complexity analysis
• Clean, readable, interview-ready code

• Python 3.11
• Typed code (typing)
• Interview-focused style and structure

• Software Engineers
• Backend / Platform Engineers
• Cloud & DevOps Engineers preparing for interviews
• Engineers targeting Senior / Staff / Architect roles