# 0515. Find Largest Value in Each Tree Row

<https://leetcode.com/problems/find-largest-value-in-each-tree-row>

## Description

Given the `root` of a binary tree, return *an array of the largest value in each row* of the tree **(0-indexed)**.

**Example 1:**

![](https://assets.leetcode.com/uploads/2020/08/21/largest_e1.jpg)

```
**Input:** root = [1,3,2,5,3,null,9]
**Output:** [1,3,9]
```

**Example 2:**

```
**Input:** root = [1,2,3]
**Output:** [1,3]
```

**Example 3:**

```
**Input:** root = [1]
**Output:** [1]
```

**Example 4:**

```
**Input:** root = [1,null,2]
**Output:** [1,2]
```

**Example 5:**

```
**Input:** root = []
**Output:** []
```

**Constraints:**

* The number of nodes in the tree will be in the range `[0, 104]`.
* `-231 <= Node.val <= 231 - 1`

## ac

```java
```