# 0764. Largest Plus Sign

<https://leetcode.com/problems/largest-plus-sign>

## Description

You are given an integer `n`. You have an `n x n` binary grid `grid` with all values initially `1`'s except for some indices given in the array `mines`. The `ith` element of the array `mines` is defined as `mines[i] = [xi, yi]` where `grid[xi][yi] == 0`.

Return *the order of the largest **axis-aligned** plus sign of* 1\*'s contained in\* `grid`. If there is none, return `0`.

An **axis-aligned plus sign** of `1`'s of order `k` has some center `grid[r][c] == 1` along with four arms of length `k - 1` going up, down, left, and right, and made of `1`'s. Note that there could be `0`'s or `1`'s beyond the arms of the plus sign, only the relevant area of the plus sign is checked for `1`'s.

**Example 1:**

![](https://assets.leetcode.com/uploads/2021/06/13/plus1-grid.jpg)

```
**Input:** n = 5, mines = [[4,2]]
**Output:** 2
**Explanation:** In the above grid, the largest plus sign can only be of order 2. One of them is shown.
```

**Example 2:**

![](https://assets.leetcode.com/uploads/2021/06/13/plus2-grid.jpg)

```
**Input:** n = 1, mines = [[0,0]]
**Output:** 0
**Explanation:** There is no plus sign, so return 0.
```

**Constraints:**

* `1 <= n <= 500`
* `1 <= mines.length <= 5000`
* `0 <= xi, yi < n`
* All the pairs `(xi, yi)` are **unique**.

## ac

```java
```


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