| Number of Islands | Medium | 63.8% | 61.9% |
| Word Search | Medium | 46.9% | 60.6% |
| Minimum Edge Reversals So Every Node Is Reachable | Hard | 57.3% | 59.7% |
| Validate Binary Search Tree | Medium | 35.4% | 55.6% |
| Binary Tree Inorder Traversal | Easy | 79.7% | 49.5% |
| Serialize and Deserialize Binary Tree | Hard | 60.4% | 47.2% |
| Course Schedule II | Medium | 55.0% | 44.1% |
| Symmetric Tree | Easy | 60.8% | 42.5% |
| Course Schedule | Medium | 50.8% | 41.2% |
| Recover Binary Search Tree | Medium | 58.8% | 36.2% |
| Maximum Depth of Binary Tree | Easy | 77.9% | 36.2% |
| Same Tree | Easy | 66.7% | 36.2% |
| Lowest Common Ancestor of a Binary Tree | Medium | 68.8% | 36.0% |
| Lowest Common Ancestor of a Binary Search Tree | Medium | 70.1% | 32.8% |
| Binary Tree Maximum Path Sum | Hard | 42.0% | 30.3% |
