Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 136 | Binary Tree Longest Consecutive Sequence II | Medium | TreeDepth-First SearchBinary Tree |
| 137 | Binary Tree Maximum Path Sum | Hard | Dynamic ProgrammingTreeDepth-First Search |
| 138 | Binary Tree Nodes | Medium | Database |
| 139 | Binary Tree Preorder Traversal | Easy | StackTreeDepth-First Search |
| 140 | Binary Tree Right Side View | Medium | TreeDepth-First SearchBreadth-First Search |
| 141 | Binary Tree Upside Down | Medium | TreeDepth-First SearchBinary Tree |
| 142 | Binary Tree Zigzag Level Order Traversal | Medium | TreeBreadth-First SearchBinary Tree |
| 143 | Bind Function to Context | Medium | JavaScript |
| 144 | Bitwise OR of Adjacent Elements | Easy | ArrayBit Manipulation |
| 145 | Bitwise OR of All Subsequence Sums | Medium | ArrayMathBit Manipulation |
| 146 | Bitwise User Permissions Analysis | Medium | Database |
| 147 | Bitwise XOR of All Pairings | Medium | ArrayBit ManipulationBrainteaser |
| 148 | Block Placement Queries | Hard | ArrayBinary SearchBinary Indexed Tree |
| 149 | Bold Words in String | Medium | ArrayHash TableString |
| 150 | Books with NULL Ratings | Easy | Database |
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