# 0959. Regions Cut By Slashes

<https://leetcode.com/problems/regions-cut-by-slashes>

## Description

An `n x n` grid is composed of `1 x 1` squares where each `1 x 1` square consists of a `'/'`, `'\'`, or blank space `' '`. These characters divide the square into contiguous regions.

Given the grid `grid` represented as a string array, return *the number of regions*.

Note that backslash characters are escaped, so a `'\'` is represented as `'\\'`.

**Example 1:**

![](https://assets.leetcode.com/uploads/2018/12/15/1.png)

```
**Input:** grid = [" /","/ "]
**Output:** 2
```

**Example 2:**

![](https://assets.leetcode.com/uploads/2018/12/15/2.png)

```
**Input:** grid = [" /","  "]
**Output:** 1
```

**Example 3:**

![](https://assets.leetcode.com/uploads/2018/12/15/3.png)

```
**Input:** grid = ["\\/","/\\"]
**Output:** 4
**Explanation:** (Recall that because \ characters are escaped, "\\/" refers to \/, and "/\\" refers to /\.)
```

**Example 4:**

![](https://assets.leetcode.com/uploads/2018/12/15/4.png)

```
**Input:** grid = ["/\\","\\/"]
**Output:** 5
**Explanation:** (Recall that because \ characters are escaped, "\\/" refers to \/, and "/\\" refers to /\.)
```

**Example 5:**

![](https://assets.leetcode.com/uploads/2018/12/15/5.png)

```
**Input:** grid = ["//","/ "]
**Output:** 3
```

**Constraints:**

* `n == grid.length`
* `n == grid[i].length`
* `1 <= n <= 30`
* `grid[i][j]` is either `'/'`, `'\'`, or `' '`.

## ac

```java
```