| 1110 | Delete Nodes And Return Forest | Medium |
| 1123 | Lowest Common Ancestor of Deepest Leaves | Medium |
| 1145 | Binary Tree Coloring Game | Medium |
| 1161 | Maximum Level Sum of a Binary Tree | Medium |
| 1261 | Find Elements in a Contaminated Binary Tree | Medium |
| 1302 | Deepest Leaves Sum | Medium |
| 1305 | All Elements in Two Binary Search Trees | Medium |
| 1315 | Sum of Nodes with Even-Valued Grandparent | Medium |
| 1325 | Delete Leaves With a Given Value | Medium |
| 1339 | Maximum Product of Splitted Binary Tree | Medium |
| 1361 | Validate Binary Tree Nodes | Medium |
| 1367 | Linked List in Binary Tree | Medium |
| 1372 | Longest ZigZag Path in a Binary Tree | Medium |
| 1373 | Maximum Sum BST in Binary Tree | Hard |
| 1379 | Find a Corresponding Node of a Binary Tree in a Clone of That Tree | Easy |
| 1382 | Balance a Binary Search Tree | Medium |
| 1448 | Count Good Nodes in Binary Tree | Medium |
| 1457 | Pseudo-Palindromic Paths in a Binary Tree | Medium |
| 1530 | Number of Good Leaf Nodes Pairs | Medium |
| 1569 | Number of Ways to Reorder Array to Get Same BST | Hard |
| 1609 | Even Odd Tree | Medium |
| 1932 | Merge BSTs to Create Single BST | Hard |
| 2049 | Count Nodes With the Highest Score | Medium |
| 2096 | Step-By-Step Directions From a Binary Tree Node to Another | Medium |
| 2196 | Create Binary Tree From Descriptions | Medium |
| 2236 | Root Equals Sum of Children | Easy |
| 2265 | Count Nodes Equal to Average of Subtree | Medium |
| 2385 | Amount of Time for Binary Tree to Be Infected | Medium |
| 2458 | Height of Binary Tree After Subtree Removal Queries | Hard |
| 2471 | Minimum Number of Operations to Sort a Binary Tree by Level | Medium |