Backtracking (27 completed)
| # | Title | Level | Cats | Solution | Languages | Date Complete |
|---|---|---|---|---|---|---|
| 17 | Letter Combinations of a Phone Number | Medium | N150 | solution | java | Jul 14, 2024 |
| 22 | Generate Parentheses | Medium | N150 | solution | py | Jun 13, 2024 |
| 39 | Combination Sum | Medium | B75, N150 | solution | py | Jul 16, 2024 |
| 40 | Combination Sum II | Medium | Daily, N150 | solution | py | Aug 13, 2024 |
| 46 | Permutations | Medium | N150 | solution | py | Jun 07, 2024 |
| 77 | Combinations | Medium | solution | py | Jun 07, 2024 | |
| 78 | Subsets | Medium | N150 | solution | py | Jun 02, 2024 |
| 79 | Word Search | Medium | B75, N150 | solution | py | Jun 27, 2024 |
| 90 | Subsets II | Medium | N150 | solution | py | Jul 03, 2024 |
| 113 | Path Sum II | Medium | solution | py | Jul 03, 2024 | |
| 131 | Palindrome Partitioning | Medium | N150 | solution | py | Jul 30, 2024 |
| 212 | Word Search II | Hard | B75, N150 | solution | py | Jun 27, 2024 |
| 320 | Generalized Abbreviation | Medium | Weekly Premium | solution | py | Aug 22, 2024 |
| 351 | Android Unlock Patterns | Medium | Weekly Premium | solution | py | Aug 13, 2024 |
| 784 | Letter Case Permutation | Medium | solution | py | Jun 15, 2024 | |
| 797 | All Paths From Source to Target | Medium | solution | py | Mar 05, 2025 | |
| 1079 | Letter Tile Possibilities | Medium | Daily | solution | py | Feb 17, 2025 |
| 1087 | Brace Expansion | Medium | solution | py | Jun 15, 2024 | |
| 1239 | Maximum Length of a Concatenated String with Unique Characters | Medium | solution | py | Jun 29, 2024 | |
| 1255 | Maximum Score Words Formed by Letters | Hard | solution | py | Jun 15, 2024 | |
| 1415 | The k-th Lexicographical String of All Happy Strings of Length n | Medium | Daily | solution | py | Feb 19, 2025 |
| 1718 | Construct the Lexicographically Largest Valid Sequence | Medium | Daily | solution | py | Feb 16, 2025 |
| 1980 | Find Unique Binary String | Medium | Daily | solution | c, py | Jun 27, 2024 |
| 2375 | Construct Smallest Number From DI String | Medium | Daily | solution | py | Feb 18, 2025 |
| 2664 | The Knight’s Tour | Medium | Weekly Premium | solution | py | Oct 26, 2024 |
| 2698 | Find the Punishment Number of an Integer | Medium | Daily | solution | py | Feb 15, 2025 |
| 3211 | Weekly Contest 405 - q2 - Generate Binary Strings Without Adjacent Zeros | Medium | Contest | solution | js, py | Jul 07, 2024 |