Practice problems across 75+ categories
Practice problems frequently asked at Stack • 172 problems | 23 Easy | 97 Medium | 51 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 121 | Next Greater Node In Linked List | Medium | ArrayLinked ListStack |
| 122 | Number of Atoms | Hard | Hash TableStringStack |
| 123 | Number of People That Can Be Seen in a Grid | Medium | ArrayStackMatrix |
| 124 | Number of Students Unable to Eat Lunch | Easy | ArrayStackQueue |
| 125 | Number of Valid Subarrays | Hard | ArrayStackMonotonic Stack |
| 126 | Number of Visible People in a Queue | Hard | ArrayStackMonotonic Stack |
| 127 | Odd Even Jump | Hard | ArrayDynamic ProgrammingStack |
| 128 | Online Stock Span | Medium | StackDesignMonotonic Stack |
| 129 | Palindrome Linked List | Easy | Linked ListTwo PointersStack |
| 130 | Parse Lisp Expression | Hard | Hash TableStringStack |
| 131 | Parsing A Boolean Expression | Hard | StringStackRecursion |
| 132 | Print Immutable Linked List in Reverse | Medium | Linked ListTwo PointersStack |
| 133 | Remove All Adjacent Duplicates In String | Easy | StringStack |
| 134 | Remove All Adjacent Duplicates in String II | Medium | StringStack |
| 135 | Remove All Occurrences of a Substring | Medium | StringStackSimulation |
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