Practice problems across 75+ categories
Practice coding problems across all companies and topics • 3600 problems | 879 Easy | 1856 Medium | 842 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 540 | Diameter of Binary Tree | Easy | TreeDepth-First SearchBinary Tree |
| 540 | Single Element in a Sorted Array | Medium | ArrayBinary Search |
| 541 | Reverse String II | Easy | Two PointersString |
| 542 | Boundary of Binary Tree | Medium | TreeDepth-First SearchBinary Tree |
| 544 | Output Contest Matches | Medium | StringRecursionSimulation |
| 546 | Remove Boxes | Hard | ArrayDynamic ProgrammingMemoization |
| 547 | Number of Provinces | Unknown | Depth-First SearchBreadth-First SearchUnion Find |
| 548 | Split Array with Equal Sum | Hard | ArrayHash TablePrefix Sum |
| 549 | Binary Tree Longest Consecutive Sequence II | Medium | TreeDepth-First SearchBinary Tree |
| 550 | Game Play Analysis IV | Medium | Database |
| 551 | Student Attendance Record I | Easy | String |
| 552 | Student Attendance Record II | Hard | Dynamic Programming |
| 553 | Optimal Division | Medium | ArrayMathDynamic Programming |
| 554 | Brick Wall | Medium | ArrayHash Table |
| 554 | Reverse Words in a String III | Easy | Two PointersString |
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