Backtracking
Total Problems: 11
Completed: 11 (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 | 0 | 0 | 0 | 0% |
| 🟡 Medium | 8 | 8 | 0 | 100% |
| 🔴 Hard | 3 | 3 | 0 | 100% |
Problems
| # | Problem | Difficulty | Status | Confidence |
|---|---|---|---|---|
| 264 | Letter Combinations of a Phone Number | M | ✅ | HGH |
| 265 | Generate Parentheses | M | ✅ | HGH |
| 266 | Combination Sum | M | ✅ | HGH |
| 267 | Combination Sum II | M | ✅ | HGH |
| 268 | Permutations | M | ✅ | HGH |
| 269 | Subsets | M | ✅ | HGH |
| 270 | Word Search | M | ✅ | HGH |
| 271 | Subsets II | M | ✅ | MED |
| 272 | Sudoku Solver | H | ✅ | HGH |
| 273 | N-Queens | H | ✅ | HGH |
| 274 | Palindrome Partitioning | H | ✅ | HGH |
Last Updated: 2026-02-13 19:40:00
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