规范格式

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# [515. Find Largest Value in Each Tree Row](https://leetcode.com/problems/find-largest-value-in-each-tree-row/)
## 题目
You need to find the largest value in each row of a binary tree.
**Example:**
Input:
1
/ \
3 2
/ \ \
5 3 9
Output: [1, 3, 9]
## 题目大意
求在二叉树的每一行中找到最大的值。
## 解题思路
- 给出一个二叉树,要求依次输出每行的最大值
- 用 BFS 层序遍历,将每层排序取出最大值。改进的做法是遍历中不断更新每层的最大值。