Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 2011 | My Calendar I | Medium | ArrayBinary SearchDesign |
| 2012 | N-ary Tree Level Order Traversal | Medium | TreeBreadth-First Search |
| 2013 | N-ary Tree Postorder Traversal | Easy | StackTreeDepth-First Search |
| 2014 | N-ary Tree Preorder Traversal | Easy | StackTreeDepth-First Search |
| 2015 | N-Queens | Hard | ArrayBacktracking |
| 2016 | N-Queens II | Hard | Backtracking |
| 2017 | N-Repeated Element in Size 2N Array | Easy | ArrayHash Table |
| 2018 | N-th Tribonacci Number | Easy | MathDynamic ProgrammingMemoization |
| 2019 | Naming a Company | Hard | ArrayHash TableString |
| 2020 | Neither Minimum nor Maximum | Easy | ArraySorting |
| 2021 | Nested Array Generator | Medium | JavaScript |
| 2022 | New 21 Game | Medium | MathDynamic ProgrammingSliding Window |
| 2023 | New Users Daily Count | Medium | Database |
| 2024 | Next Day | Easy | JavaScript |
| 2025 | Next Greater Element I | Easy | ArrayHash TableStack |
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