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 Element I | Easy | ArrayHash TableStack |
| 122 | Next Greater Element II | Medium | ArrayStackMonotonic Stack |
| 123 | Next Greater Element IV | Hard | ArrayBinary SearchStack |
| 124 | Next Greater Node In Linked List | Medium | ArrayLinked ListStack |
| 125 | Number of Atoms | Hard | Hash TableStringStack |
| 126 | Number of People That Can Be Seen in a Grid | Medium | ArrayStackMatrix |
| 127 | Number of Students Unable to Eat Lunch | Easy | ArrayStackQueue |
| 128 | Number of Valid Subarrays | Hard | ArrayStackMonotonic Stack |
| 129 | Number of Visible People in a Queue | Hard | ArrayStackMonotonic Stack |
| 130 | Odd Even Jump | Hard | ArrayDynamic ProgrammingStack |
| 131 | Online Stock Span | Medium | StackDesignMonotonic Stack |
| 132 | Palindrome Linked List | Easy | Linked ListTwo PointersStack |
| 133 | Parse Lisp Expression | Hard | Hash TableStringStack |
| 134 | Parsing A Boolean Expression | Hard | StringStackRecursion |
| 135 | Print Immutable Linked List in Reverse | Medium | Linked ListTwo PointersStack |
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