| 988 | Smallest String Starting From Leaf | Medium |
| 993 | Cousins in Binary Tree | Easy |
| 998 | Maximum Binary Tree II | Medium |
| 1008 | Construct Binary Search Tree from Preorder Traversal | Medium |
| 1022 | Sum of Root To Leaf Binary Numbers | Easy |
| 1026 | Maximum Difference Between Node and Ancestor | Medium |
| 1028 | Recover a Tree From Preorder Traversal | Hard |
| 1038 | Binary Search Tree to Greater Sum Tree | Medium |
| 1080 | Insufficient Nodes in Root to Leaf Paths | Medium |
| 1104 | Path In Zigzag Labelled Binary Tree | Medium |
| 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 |
| 1376 | Time Needed to Inform All Employees | Medium |
| 1377 | Frog Position After T Seconds | Hard |
| 1379 | Find a Corresponding Node of a Binary Tree in a Clone of That Tree | Easy |
| 1382 | Balance a Binary Search Tree | Medium |
| 1443 | Minimum Time to Collect All Apples in a Tree | Medium |
| 1448 | Count Good Nodes in Binary Tree | Medium |