Mind palace

01-19

116. Populating Next Right Pointers in Each Node

01-19

117. Populating Next Right Pointers in Each Node II

01-18

112. Path Sum

01-18

105. Construct Binary Tree from Preorder and Inorder Traversal

01-18

230. Kth Smallest Element in a BST

01-18

572. Subtree of Another Tree

01-18

993. Cousins in Binary Tree

01-18

865. Smallest Subtree with all the Deepest Nodes

01-18

1123. Lowest Common Ancestor of Deepest Leaves

01-18

235. Lowest Common Ancestor of a Binary Search Tree