Practice problems across 75+ categories
Practice problems frequently asked at Meta • 2900 problems | 652 Easy | 1528 Medium | 703 Hard
| # | Problem | Difficulty | Topics |
|---|---|---|---|
| 121 | Biggest Single Number | Easy | Database |
| 122 | Biggest Window Between Visits | Medium | Database |
| 123 | Binary Gap | Easy | Bit Manipulation |
| 124 | Binary Number with Alternating Bits | Easy | Bit Manipulation |
| 125 | Binary Search | Easy | ArrayBinary Search |
| 126 | Binary Search Tree Iterator II | Medium | StackTreeDesign |
| 127 | Binary Search Tree to Greater Sum Tree | Medium | TreeDepth-First SearchBinary Search Tree |
| 128 | Binary Searchable Numbers in an Unsorted Array | Medium | ArrayBinary Search |
| 129 | Binary Subarrays With Sum | Medium | ArrayHash TableSliding Window |
| 130 | Binary Tree Cameras | Hard | Dynamic ProgrammingTreeDepth-First Search |
| 131 | Binary Tree Coloring Game | Medium | TreeDepth-First SearchBinary Tree |
| 132 | Binary Tree Inorder Traversal | Easy | StackTreeDepth-First Search |
| 133 | Binary Tree Level Order Traversal | Medium | TreeBreadth-First SearchBinary Tree |
| 134 | Binary Tree Level Order Traversal II | Medium | TreeBreadth-First SearchBinary Tree |
| 135 | Binary Tree Longest Consecutive Sequence | Medium | TreeDepth-First SearchBinary Tree |
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