| 669. Trim a Binary Search Tree | | | Solve | Medium | | |
| 687. Longest Univalue Path | | | Solve | Medium | | |
| 701. Insert into a Binary Search Tree | | | Solve | Medium | | |
| 742. Closest Leaf in a Binary Tree | | | Solve | Medium | | |
| 776. Split BST | | | Solve | Medium | | |
| 814. Binary Tree Pruning | | | Solve | Medium | | |
| 863. All Nodes Distance K in Binary Tree | | | Solve | Medium | | |
| 865. Smallest Subtree with all the Deepest Nodes | | | Solve | Medium | | |
| 889. Construct Binary Tree from Preorder and Postorder Traversal | | | Solve | Medium | | |
| 894. All Possible Full Binary Trees | | | Solve | Medium | | |
| 919. Complete Binary Tree Inserter | | | Solve | Medium | | |
| 951. Flip Equivalent Binary Trees | | | Solve | Medium | | |
| 958. Check Completeness of a Binary Tree | | | Solve | Medium | | |
| 971. Flip Binary Tree To Match Preorder Traversal | | | Solve | Medium | | |
| 979. Distribute Coins in Binary Tree | | | Solve | Medium | | |
| 988. Smallest String Starting From Leaf | | | Solve | Medium | | |
| 998. Maximum Binary Tree II | | | Solve | Medium | | |
| 1008. Construct Binary Search Tree from Preorder Traversal | | | Solve | Medium | | |
| 1026. Maximum Difference Between Node and Ancestor | | | Solve | Medium | | |
| 1038. Binary Search Tree to Greater Sum Tree | | | Solve | Medium | | |
| 1080. Insufficient Nodes in Root to Leaf Paths | | | Solve | Medium | | |
| 1104. Path In Zigzag Labelled Binary Tree | | | Solve | Medium | | |
| 1110. Delete Nodes And Return Forest | | | Solve | Medium | | |
| 1120. Maximum Average Subtree | | | Solve | Medium | | |
| 1123. Lowest Common Ancestor of Deepest Leaves | | | Solve | Medium | | |
| 1145. Binary Tree Coloring Game | | | Solve | Medium | | |
| 1161. Maximum Level Sum of a Binary Tree | | | Solve | Medium | | |
| 1214. Two Sum BSTs | | | Solve | Medium | | |
| 1261. Find Elements in a Contaminated Binary Tree | | | Solve | Medium | | |
| 1302. Deepest Leaves Sum | | | Solve | Medium | | |
| 1305. All Elements in Two Binary Search Trees | | | Solve | Medium | | |
| 1315. Sum of Nodes with Even-Valued Grandparent | | | Solve | Medium | | |
| 1325. Delete Leaves With a Given Value | | | Solve | Medium | | |
| 1339. Maximum Product of Splitted Binary Tree | | | Solve | Medium | | |
| 1361. Validate Binary Tree Nodes | | | Solve | Medium | | |
| 1367. Linked List in Binary Tree | | | Solve | Medium | | |
| 1372. Longest ZigZag Path in a Binary Tree | | | Solve | Medium | | |
| 1382. Balance a Binary Search Tree | | | Solve | Medium | | |
| 1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree | | | Solve | Medium | | |
| 1448. Count Good Nodes in Binary Tree | | | Solve | Medium | | |
| 1457. Pseudo-Palindromic Paths in a Binary Tree | | | Solve | Medium | | |
| 1485. Clone Binary Tree With Random Pointer | | | Solve | Medium | | |
| 1530. Number of Good Leaf Nodes Pairs | | | Solve | Medium | | |
| 1586. Binary Search Tree Iterator II | | | Solve | Medium | | |
| 1602. Find Nearest Right Node in Binary Tree | | | Solve | Medium | | |
| 1609. Even Odd Tree | | | Solve | Medium | | |
| 1612. Check If Two Expression Trees are Equivalent | | | Solve | Medium | | |
| 1628. Design an Expression Tree With Evaluate Function | | | Solve | Medium | | |
| 1644. Lowest Common Ancestor of a Binary Tree II | | | Solve | Medium | | |
| 1650. Lowest Common Ancestor of a Binary Tree III | | | Solve | Medium | | |
