Practice problems across 75+ categories
Practice problems frequently asked at Stack • 172 problems | 23 Easy | 97 Medium | 51 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 136 | Remove All Adjacent Duplicates In String | Easy | StringStack |
| 137 | Remove All Adjacent Duplicates in String II | Medium | StringStack |
| 138 | Remove All Occurrences of a Substring | Medium | StringStackSimulation |
| 139 | Remove Duplicate Letters | Medium | StringStackGreedy |
| 140 | Remove K Digits | Medium | StringStackGreedy |
| 141 | Remove Nodes From Linked List | Medium | Linked ListStackRecursion |
| 142 | Remove Outermost Parentheses | Easy | StringStack |
| 143 | Removing Stars From a String | Medium | StringStackSimulation |
| 144 | Reorder List | Medium | Linked ListTwo PointersStack |
| 145 | Replace Non-Coprime Numbers in Array | Hard | ArrayMathStack |
| 146 | Resulting String After Adjacent Removals | Medium | StringStackSimulation |
| 147 | Reverse Prefix of Word | Easy | Two PointersStringStack |
| 148 | Reverse Substrings Between Each Pair of Parentheses | Medium | StringStack |
| 149 | Robot Collisions | Hard | ArrayStackSorting |
| 150 | Score of Parentheses | Medium | StringStack |
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