| 0046 | Permutations LeetCode XXXX Array, Backtracking | Medium | | |
| 0047 | Permutations II LeetCode XXXX Array, Backtracking | Medium | | |
| 0037 | Sudoku Solver LeetCode XXXX Array, Hash Table, Backtracking, Matrix | Hard | | |
| 0022 | Generate Parentheses LeetCode XXXX String, Dynamic Programming, Backtracking | Medium | | |
| 0017 | Letter Combinations of a Phone Number LeetCode XXXX Hash Table, String, Backtracking | Medium | | |
| 0784 | Letter Case Permutation LeetCode XXXX Bit Manipulation, String, Backtracking | Medium | | |
| 0039 | Combination Sum LeetCode XXXX Array, Backtracking | Medium | | |
| 0040 | Combination Sum II LeetCode XXXX Array, Backtracking | Medium | | |
| 0078 | Subsets LeetCode XXXX Bit Manipulation, Array, Backtracking | Medium | | |
| 0090 | Subsets II LeetCode XXXX Bit Manipulation, Array, Backtracking | Medium | | |
| 0473 | Matchsticks to Square LeetCode XXXX Bit Manipulation, Array, Dynamic Programming, Backtracking, State Compression | Medium | | |
| 1593 | Split a String Into the Max Number of Unique Substrings LeetCode XXXX Hash Table, String, Backtracking | Medium | | |
| 1079 | Letter Tile Possibilities LeetCode XXXX Hash Table, String, Backtracking, Counting | Medium | | |
| 0093 | Restore IP Addresses LeetCode XXXX String, Backtracking | Medium | | |
| 0079 | Word Search LeetCode XXXX Array, Backtracking, Matrix | Medium | | |
| 0679 | 24 Game | | Array, Math, Backtracking | Hard |