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
101. Symmetric Tree
No summary
226. Invert Binary Tree
Recursive and iterative solution
105. Construct Binary Tree from Preorder and Inorder Traversal
No summary
704. Binary Search
A classic binary search example