Practice problems across 75+ categories
Practice problems frequently asked at Backtracking • 109 problems | 3 Easy | 73 Medium | 32 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 91 | Subsets | Medium | ArrayBacktrackingBit Manipulation |
| 92 | Subsets II | Medium | ArrayBacktrackingBit Manipulation |
| 93 | Sudoku Solver | Hard | ArrayHash TableBacktracking |
| 94 | Sum of All Subset XOR Totals | Easy | ArrayMathBacktracking |
| 95 | Synonymous Sentences | Medium | ArrayHash TableString |
| 96 | Target Sum | Medium | ArrayDynamic ProgrammingBacktracking |
| 97 | The k-th Lexicographical String of All Happy Strings of Length n | Medium | StringBacktracking |
| 98 | The Knight's Tour | Medium | ArrayBacktrackingMatrix |
| 99 | The Number of Beautiful Subsets | Medium | ArrayHash TableMath |
| 100 | Tiling a Rectangle with the Fewest Squares | Hard | Backtracking |
| 101 | Unique Binary Search Trees II | Medium | Dynamic ProgrammingBacktrackingTree |
| 102 | Unique Paths III | Hard | ArrayBacktrackingBit Manipulation |
| 103 | Verbal Arithmetic Puzzle | Hard | ArrayMathString |
| 104 | Word Break II | Hard | ArrayHash TableString |
| 105 | Word Ladder II | Hard | Hash TableStringBacktracking |
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