| 0098 | Validate Binary Search Tree LeetCode XXXX Tree, Depth-First Search, Binary Search Tree, Binary Tree | Medium | | |
| 0173 | Binary Search Tree Iterator LeetCode XXXX Stack, Tree, Design, Binary Search Tree, Binary Tree, Iterator | Medium | | |
| 0700 | Search in a Binary Search Tree LeetCode XXXX Tree, Binary Search Tree, Binary Tree | Easy | | |
| 0701 | Insert into a Binary Search Tree LeetCode XXXX Tree, Binary Search Tree, Binary Tree | Medium | | |
| 0450 | Delete Node in a BST LeetCode XXXX Tree, Binary Search Tree, Binary Tree | Medium | | |
| 0703 | Kth Largest Element in a Stream LeetCode XXXX Tree, Design, Binary Search Tree, Binary Tree, Stream, Heap (Priority Queue) | Easy | | |
| 0230 | Kth Smallest Element in a BST | | Tree, Depth-First Search, Binary Search Tree, Binary Tree | Medium |
| 0235 | Lowest Common Ancestor of a Binary Search Tree LeetCode XXXX Tree, Depth-First Search, Binary Search Tree, Binary Tree | Easy | | |
| 0426 | Convert Binary Search Tree to Sorted Doubly Linked List LeetCode XXXX Stack, Tree, Depth-First Search, Binary Search Tree, Linked List, Binary Tree, Doubly Linked List | Medium | | |
| 0108 | Convert Sorted Array to Binary Search Tree LeetCode XXXX Tree, Binary Search Tree, Array, Divide and Conquer, Binary Tree | Easy | | |
| 0110 | Balanced Binary Tree LeetCode XXXX Tree, Depth-First Search, Binary Tree | Easy | | |