235. Lowest Common Ancestor of a Binary Search Tree
Use the definition of BST to solve the problem
Binary Tree
236. Lowest Common Ancestor of a Binary Tree
No summary
98. Validate Binary Search Tree
I think this is an article worth to read😉
103. Binary Tree Zigzag Level Order Traversal
No summary
107. Binary Tree Level Order Traversal II
No summary
102. Binary Tree Level Order Traversal
iterative and recursive solution
572. Subtree of Another Tree
No summary
230. Kth Smallest Element in a BST
We know that the in-order traversal sequence of a binary search tree is sorted, thus we can use it solve the problem.
112. Path Sum
No summary
297. Serialize and Deserialize Binary Tree
recursive and iterative ways to solve this problem