Stacks
Total Problems: 13
Completed: 13 (100%)
📚 Pattern Master Notes
This comprehensive guide includes: - 🧠 Pattern recognition & problem-solving mindset - 🎯 Sub-patterns and variations - 🏆 Golden templates and code examples - ⚠️ Common pitfalls and debugging tips - 📊 Decision trees and quick reference tables
💡 Tip: Read the notes before starting problems to build intuition!
Progress by Difficulty
| Difficulty | Total | Completed | Remaining | Percentage |
|---|---|---|---|---|
| 🟢 Easy | 4 | 4 | 0 | 100% |
| 🟡 Medium | 7 | 7 | 0 | 100% |
| 🔴 Hard | 2 | 2 | 0 | 100% |
Problems
| # | Problem | Difficulty | Status | Confidence |
|---|---|---|---|---|
| 101 | Valid Parentheses | E | ✅ | HGH |
| 102 | Baseball Game | E | ✅ | HGH |
| 103 | Backspace String Compare | E | ✅ | MED |
| 104 | Remove All Adjacent Duplicates In String | E | ✅ | HGH |
| 105 | Generate Parentheses | M | ✅ | HGH |
| 106 | Simplify Path | M | ✅ | HGH |
| 107 | Evaluate Reverse Polish Notation | M | ✅ | HGH |
| 108 | Min Stack | M | ✅ | HGH |
| 109 | Decode String | M | ✅ | LOW |
| 110 | Asteroid Collision | M | ✅ | MED |
| 111 | Minimum Add to Make Parentheses Valid | M | ✅ | HGH |
| 112 | Largest Rectangle in Histogram | H | ✅ | LOW |
| 113 | Basic Calculator | H | ✅ | MED |
Last Updated: 2026-02-13 19:40:00
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