Practice problems across 75+ categories
Practice problems frequently asked at Backtracking • 109 problems | 3 Easy | 73 Medium | 32 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 76 | Permutations III | Medium | ArrayBacktracking |
| 77 | Probability of a Two Boxes Having The Same Number of Distinct Balls | Hard | ArrayMathDynamic Programming |
| 78 | Pyramid Transition Matrix | Medium | Hash TableStringBacktracking |
| 79 | Remove Invalid Parentheses | Hard | StringBacktrackingBreadth-First Search |
| 80 | Restore IP Addresses | Medium | StringBacktracking |
| 81 | Robot Room Cleaner | Hard | BacktrackingInteractive |
| 82 | Shopping Offers | Medium | ArrayDynamic ProgrammingBacktracking |
| 83 | Sliding Puzzle | Hard | ArrayDynamic ProgrammingBacktracking |
| 84 | Smallest Divisible Digit Product II | Hard | MathStringBacktracking |
| 85 | Smallest String Starting From Leaf | Medium | StringBacktrackingTree |
| 86 | Split a String Into the Max Number of Unique Substrings | Medium | Hash TableStringBacktracking |
| 87 | Split Array into Fibonacci Sequence | Medium | StringBacktracking |
| 88 | Splitting a String Into Descending Consecutive Values | Medium | StringBacktrackingEnumeration |
| 89 | Stepping Numbers | Medium | MathBacktrackingBreadth-First Search |
| 90 | Stickers to Spell Word | Hard | ArrayHash TableString |
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