| 1469. Find All The Lonely Nodes | | | Solve | Easy | | |
| 1483. Kth Ancestor of a Tree Node | | | Solve | Hard | | |
| 1485. Clone Binary Tree With Random Pointer | | | Solve | Medium | | |
| 1490. Clone N-ary Tree | | | Solve | Medium | | |
| 1506. Find Root of N-Ary Tree | | | Solve | Medium | | |
| 1516. Move Sub-Tree of N-Ary Tree | | | Solve | Hard | | |
| 1519. Number of Nodes in the Sub-Tree With the Same Label | | | Solve | Medium | | |
| 1522. Diameter of N-Ary Tree | | | Solve | Medium | | |
| 1530. Number of Good Leaf Nodes Pairs | | | Solve | Medium | | |
| 1569. Number of Ways to Reorder Array to Get Same BST | | | Solve | Hard | | |
| 1586. Binary Search Tree Iterator II | | | Solve | Medium | | |
| 1597. Build Binary Expression Tree From Infix Expression | | | Solve | Hard | | |
| 1600. Throne Inheritance | | | 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 | | |
| 1617. Count Subtrees With Max Distance Between Cities | | | Solve | Hard | | |
| 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 | | |
| 1660. Correct a Binary Tree | | | Solve | Medium | | |
| 1666. Change the Root of a Binary Tree | | | Solve | Medium | | |
| 1676. Lowest Common Ancestor of a Binary Tree IV | | | Solve | Medium | | |
| 1719. Number Of Ways To Reconstruct A Tree | | | Solve | Hard | | |
| 1740. Find Distance in a Binary Tree | | | Solve | Medium | | |
| 1766. Tree of Coprimes | | | Solve | Hard | | |
| 1902. Depth of BST Given Insertion Order | | | Solve | Medium | - | |
| 1916. Count Ways to Build Rooms in an Ant Colony | | | Solve | Hard | | |
| 1932. Merge BSTs to Create Single BST | | | Solve | Hard | - | |
| 1973. Count Nodes Equal to Sum of Descendants | | | Solve | Medium | | |
| 1993. Operations on Tree | | | Solve | Medium | | |
| 2003. Smallest Missing Genetic Value in Each Subtree | | | Solve | Hard | | |
| 2005. Subtree Removal Game with Fibonacci Tree | | | Solve | Hard | | |
| 2049. Count Nodes With the Highest Score | | | Solve | Medium | | |
| 2096. Step-By-Step Directions From a Binary Tree Node to Another | | | Solve | Medium | | |
| 2196. Create Binary Tree From Descriptions | | | Solve | Medium | | |
| 2236. Root Equals Sum of Children | | | Solve | Easy | | |
| 2246. Longest Path With Different Adjacent Characters | | | Solve | Hard | | |
| 2265. Count Nodes Equal to Average of Subtree | | | Solve | Medium | | |
| 2277. Closest Node to Path in Tree | | | Solve | Hard | | |
| 2313. Minimum Flips in Binary Tree to Get Result | | | Solve | Hard | | |
| 2322. Minimum Score After Removals on a Tree | | | Solve | Hard | | |
| 2331. Evaluate Boolean Binary Tree | | | Solve | Easy | | |
| 2368. Reachable Nodes With Restrictions | | | Solve | Medium | | |
| 2378. Choose Edges to Maximize Score in a Tree | | | Solve | Medium | | |
| 2385. Amount of Time for Binary Tree to Be Infected | | | Solve | Medium | | |
| 2415. Reverse Odd Levels of Binary Tree | | | Solve | Medium | | |
| 2421. Number of Good Paths | | | Solve | Hard | | |
| 2440. Create Components With Same Value | | | Solve | Hard | | |
| 2445. Number of Nodes With Value One | | | Solve | Medium | | |
