Practice problems across 75+ categories
Practice problems frequently asked at Backtracking • 109 problems | 3 Easy | 73 Medium | 32 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 16 | Combination Sum II | Medium | ArrayBacktracking |
| 17 | Combination Sum III | Medium | ArrayBacktracking |
| 18 | Combinations | Medium | Backtracking |
| 19 | Confusing Number II | Hard | MathBacktracking |
| 20 | Construct Smallest Number From DI String | Medium | StringBacktrackingStack |
| 21 | Construct the Lexicographically Largest Valid Sequence | Medium | ArrayBacktracking |
| 22 | Count Number of Maximum Bitwise-OR Subsets | Medium | ArrayBacktrackingBit Manipulation |
| 23 | Count Numbers with Unique Digits | Medium | MathDynamic ProgrammingBacktracking |
| 24 | Crossword Filler | Medium | RecursionBacktracking2D Array |
| 25 | Cryptarithmetic Solver | Medium | RecursionBacktrackingLogic |
| 26 | Distribute Repeating Integers | Hard | ArrayDynamic ProgrammingBacktracking |
| 27 | Expression Add Operators | Hard | MathStringBacktracking |
| 28 | Factor Combinations | Medium | Backtracking |
| 29 | Fair Distribution of Cookies | Medium | ArrayDynamic ProgrammingBacktracking |
| 30 | Find Minimum Time to Finish All Jobs | Hard | ArrayDynamic ProgrammingBacktracking |
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