## Find All Groups of Farmland leetcode solution

You are given a **0-indexed** `m x n`

binary matrix `land`

where a `0`

represents a hectare of forested land and a `1`

represents a hectare of farmland.

To keep the land organized, there are designated rectangular areas of hectares that consist **entirely** of farmland. These rectangular areas are called **groups**. No two groups are adjacent, meaning farmland in one group is **not** four-directionally adjacent to another farmland in a different group.

`land`

can be represented by a coordinate system where the top left corner of `land`

is `(0, 0)`

and the bottom right corner of `land`

is `(m-1, n-1)`

. Find the coordinates of the top left and bottom right corner of each **group** of farmland. A **group** of farmland with a top left corner at `(r`

and a bottom right corner at _{1}, c_{1})`(r`

is represented by the 4-length array _{2}, c_{2})`[r`

_{1}, c_{1}, r_{2}, c_{2}].

Return *a 2D array containing the 4-length arrays described above for each group of farmland in *

`land`

*. If there are no groups of farmland, return an empty array. You may return the answer in*.

**any order**Find All Groups of Farmland leetcode solution

**Example 1:**

Input:land = [[1,0,0],[0,1,1],[0,1,1]]Output:[[0,0,0,0],[1,1,2,2]]Explanation:The first group has a top left corner at land[0][0] and a bottom right corner at land[0][0]. The second group has a top left corner at land[1][1] and a bottom right corner at land[2][2].

**Example 2:**

Input:land = [[1,1],[1,1]]Output:[[0,0,1,1]]Explanation:The first group has a top left corner at land[0][0] and a bottom right corner at land[1][1].

**Example 3:**

Input:land = [[0]]Output:[]Explanation:There are no groups of farmland.

**Constraints:**

`m == land.length`

`n == land[i].length`

`1 <= m, n <= 300`

`land`

consists of only`0`

‘s and`1`

‘s.- Groups of farmland are
**rectangular**in shape.

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