Practice problems across 75+ categories
Practice problems frequently asked at Backtracking • 109 problems | 3 Easy | 73 Medium | 32 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 76 | Palindrome Permutation II | Medium | Hash TableStringBacktracking |
| 77 | Partition String Into Minimum Beautiful Substrings | Medium | Hash TableStringDynamic Programming |
| 78 | Partition to K Equal Sum Subsets | Medium | ArrayDynamic ProgrammingBacktracking |
| 79 | Path Sum II | Medium | BacktrackingTreeDepth-First Search |
| 80 | Path with Maximum Gold | Medium | ArrayBacktrackingMatrix |
| 81 | Permutations | Medium | ArrayBacktracking |
| 82 | Permutations II | Medium | ArrayBacktrackingSorting |
| 83 | Permutations III | Medium | ArrayBacktracking |
| 84 | Probability of a Two Boxes Having The Same Number of Distinct Balls | Hard | ArrayMathDynamic Programming |
| 85 | Pyramid Transition Matrix | Medium | Hash TableStringBacktracking |
| 86 | Rat in a Maze | Medium | RecursionBacktracking2D Array |
| 87 | Remove Invalid Parentheses | Hard | StringBacktrackingBreadth-First Search |
| 88 | Restore IP Addresses | Medium | StringBacktracking |
| 89 | Robot Room Cleaner | Hard | BacktrackingInteractive |
| 90 | Safe Placement Puzzle | Medium | RecursionBacktracking2D Array |
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