Practice problems across 75+ categories
Practice problems frequently asked at Stack • 172 problems | 23 Easy | 97 Medium | 51 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 151 | Smallest K-Length Subsequence With Occurrences of a Letter | Hard | StringStackGreedy |
| 152 | Smallest Subarray to Sort in Every Sliding Window | Medium | ArrayTwo PointersStack |
| 153 | Smallest Subsequence of Distinct Characters | Medium | StringStackGreedy |
| 154 | Stamping The Sequence | Hard | StringStackGreedy |
| 155 | Steps to Make Array Non-decreasing | Medium | ArrayLinked ListStack |
| 156 | Subarray With Elements Greater Than Varying Threshold | Hard | ArrayStackUnion Find |
| 157 | Sum of Subarray Minimums | Medium | ArrayDynamic ProgrammingStack |
| 158 | Sum of Subarray Ranges | Medium | ArrayStackMonotonic Stack |
| 159 | Sum of Total Strength of Wizards | Hard | ArrayStackMonotonic Stack |
| 160 | Tag Validator | Hard | StringStack |
| 161 | Ternary Expression Parser | Medium | StringStackRecursion |
| 162 | The Number of Weak Characters in the Game | Medium | ArrayStackGreedy |
| 163 | The Score of Students Solving Math Expression | Hard | ArrayHash TableMath |
| 164 | Trapping Rain Water | Hard | ArrayTwo PointersDynamic Programming |
| 165 | Two Sum BSTs | Medium | Two PointersBinary SearchStack |
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