Mind palace

01-17

545. Boundary of Binary Tree

01-16

449. Serialize and Deserialize BST

01-12

257. Binary Tree Paths

01-08

114. Flatten Binary Tree to Linked List

01-06

1644. Lowest Common Ancestor of a Binary Tree II

12-06

333. Largest BST Subtree

12-02

140. Word Break II

12-02

236. Lowest Common Ancestor of a Binary Tree

11-29

543. Diameter of Binary Tree

11-22

124. Binary Tree Maximum Path Sum