Week 20
Patterns: Backtracking, DP - MCM, DP - State Machines
Total Problems: 22
Completed: 19 (86%)
Progress by Difficulty
| Difficulty | Total | Completed | Remaining | Percentage |
|---|---|---|---|---|
| 🟢 Easy | 1 | 1 | 0 | 100% |
| 🟡 Medium | 13 | 13 | 0 | 100% |
| 🔴 Hard | 8 | 5 | 3 | 62% |
Problems
| # | Problem | Pattern | D | Status | Conf |
|---|---|---|---|---|---|
| 253 | Palindrome Partitioning II | DP - MCM | M | ✅ | LOW |
| 254 | Partition Array for Maximum Sum | DP - MCM | M | ✅ | MED |
| 255 | Palindrome Partitioning III | DP - MCM | M | ✅ | MED |
| 256 | Burst Balloons | DP - MCM | H | ⬜ | – |
| 257 | Minimum Cost to Merge Stones | DP - MCM | H | ⬜ | – |
| 258 | Minimum Cost to Cut a Stick | DP - MCM | H | ⬜ | – |
| 259 | Best Time to Buy and Sell Stock | DP - State Machines | E | ✅ | HGH |
| 260 | Best Time to Buy and Sell Stock II | DP - State Machines | M | ✅ | HGH |
| 261 | Best Time to Buy and Sell Stock with Cooldown | DP - State Machines | M | ✅ | HGH |
| 262 | Best Time to Buy and Sell Stock III | DP - State Machines | H | ✅ | HGH |
| 263 | Best Time to Buy and Sell Stock IV | DP - State Machines | H | ✅ | HGH |
| 264 | Letter Combinations of a Phone Number | Backtracking | M | ✅ | HGH |
| 265 | Generate Parentheses | Backtracking | M | ✅ | HGH |
| 266 | Combination Sum | Backtracking | M | ✅ | HGH |
| 267 | Combination Sum II | Backtracking | M | ✅ | HGH |
| 268 | Permutations | Backtracking | M | ✅ | HGH |
| 269 | Subsets | Backtracking | M | ✅ | HGH |
| 270 | Word Search | Backtracking | M | ✅ | HGH |
| 271 | Subsets II | Backtracking | M | ✅ | MED |
| 272 | Sudoku Solver | Backtracking | H | ✅ | HGH |
| 273 | N-Queens | Backtracking | H | ✅ | HGH |
| 274 | Palindrome Partitioning | Backtracking | H | ✅ | HGH |
Last Updated: 2026-02-13 19:40:00
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