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I wish that blasted baby would stop crying!

The static method `Object.

Given the `root` of a binary tree, return its maximum depth.

金溪民方仲永，世隶耕。

git diff --name-status firstbranch.

飞来山上千寻塔，闻说鸡鸣见日升。

git diff mybranch master -- myfile.

Given the `root` of a binary tree, return the level order traversal of its nodes' values.

Given the `root` of a binary tree, return the zigzag level order traversal of its nodes' values.

Given the `root` of a binary tree, determine if it is a valid binary search tree (BST).