104. Maximum Depth of Binary Tree
226. Invert Binary Tree
二叉树的遍历
先序遍历：144. Binary Tree Preorder Traversal
中序遍历：94. Binary Tree Inorder Traversal
后序遍历：145. Binary Tree Postorder Traversal
层次遍历：102. Binary Tree Level Order Traversal
107. Binary Tree Level Order Traversal II
蛇形层次遍历：103. Binary Tree Zigzag Level Order Traversal
垂直遍历：314. Binary Tree Vertical Order Traversal
根据前序/后序 + 中序 遍历序列构造树：
105. Construct Binary Tree from Preorder and Inorder Traversal
106. Construct Binary Tree from Inorder and Postorder Traversal
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