Count Sub Islands
<p>You are given two <code>m x n</code> binary matrices <code>grid1</code> and <code>grid2</code> containing only <code>0</code>&#39;s (representing water) and <code>1</code>&#39;s (representing land). An <strong>island</strong> is a group of <code>1</code>&#39;s connected <strong>4-directionally</strong> (horizontal or vertical). Any cells outside of the grid are considered water cells.</p>

<p>An island in <code>grid2</code> is considered a <strong>sub-island </strong>if there is an island in <code>grid1</code> that contains <strong>all</strong> the cells that make up <strong>this</strong> island in <code>grid2</code>.</p>

<p>Return the <em><strong>number</strong> of islands in </em><code>grid2</code> <em>that are considered <strong>sub-islands</strong></em>.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/06/10/test1.png" style="width: 493px; height: 205px;" />
<pre>
<strong>Input:</strong> grid1 = [[1,1,1,0,0],[0,1,1,1,1],[0,0,0,0,0],[1,0,0,0,0],[1,1,0,1,1]], grid2 = [[1,1,1,0,0],[0,0,1,1,1],[0,1,0,0,0],[1,0,1,1,0],[0,1,0,1,0]]
<strong>Output:</strong> 3
<strong>Explanation: </strong>In the picture above, the grid on the left is grid1 and the grid on the right is grid2.
The 1s colored red in grid2 are those considered to be part of a sub-island. There are three sub-islands.
</pre>

<p><strong class="example">Example 2:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/06/03/testcasex2.png" style="width: 491px; height: 201px;" />
<pre>
<strong>Input:</strong> grid1 = [[1,0,1,0,1],[1,1,1,1,1],[0,0,0,0,0],[1,1,1,1,1],[1,0,1,0,1]], grid2 = [[0,0,0,0,0],[1,1,1,1,1],[0,1,0,1,0],[0,1,0,1,0],[1,0,0,0,1]]
<strong>Output:</strong> 2 
<strong>Explanation: </strong>In the picture above, the grid on the left is grid1 and the grid on the right is grid2.
The 1s colored red in grid2 are those considered to be part of a sub-island. There are two sub-islands.
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>m == grid1.length == grid2.length</code></li>
	<li><code>n == grid1[i].length == grid2[i].length</code></li>
	<li><code>1 &lt;= m, n &lt;= 500</code></li>
	<li><code>grid1[i][j]</code> and <code>grid2[i][j]</code> are either <code>0</code> or <code>1</code>.</li>
</ul>

['number-of-islands', 'number-of-distinct-islands', 'find-all-groups-of-farmland']
[]
[{"value": "cpp", "text": "C++", "defaultCode": "class Solution {\npublic:\n    int countSubIslands(vector<vector<int>>& grid1, vector<vector<int>>& grid2) {\n        \n    }\n};"}, {"value": "java", "text": "Java", "defaultCode": "class Solution {\n    public int countSubIslands(int[][] grid1, int[][] grid2) {\n        \n    }\n}"}, {"value": "python", "text": "Python", "defaultCode": "class Solution(object):\n    def countSubIslands(self, grid1, grid2):\n        \"\"\"\n        :type grid1: List[List[int]]\n        :type grid2: List[List[int]]\n        :rtype: int\n        \"\"\"\n        "}, {"value": "python3", "text": "Python3", "defaultCode": "class Solution:\n    def countSubIslands(self, grid1: List[List[int]], grid2: List[List[int]]) -> int:\n        "}, {"value": "c", "text": "C", "defaultCode": "int countSubIslands(int** grid1, int grid1Size, int* grid1ColSize, int** grid2, int grid2Size, int* grid2ColSize) {\n    \n}"}, {"value": "csharp", "text": "C#", "defaultCode": "public class Solution {\n    public int CountSubIslands(int[][] grid1, int[][] grid2) {\n        \n    }\n}"}, {"value": "javascript", "text": "JavaScript", "defaultCode": "/**\n * @param {number[][]} grid1\n * @param {number[][]} grid2\n * @return {number}\n */\nvar countSubIslands = function(grid1, grid2) {\n    \n};"}, {"value": "typescript", "text": "TypeScript", "defaultCode": "function countSubIslands(grid1: number[][], grid2: number[][]): number {\n    \n};"}, {"value": "php", "text": "PHP", "defaultCode": "class Solution {\n\n    /**\n     * @param Integer[][] $grid1\n     * @param Integer[][] $grid2\n     * @return Integer\n     */\n    function countSubIslands($grid1, $grid2) {\n        \n    }\n}"}, {"value": "swift", "text": "Swift", "defaultCode": "class Solution {\n    func countSubIslands(_ grid1: [[Int]], _ grid2: [[Int]]) -> Int {\n        \n    }\n}"}, {"value": "kotlin", "text": "Kotlin", "defaultCode": "class Solution {\n    fun countSubIslands(grid1: Array<IntArray>, grid2: Array<IntArray>): Int {\n        \n    }\n}"}, {"value": "dart", "text": "Dart", "defaultCode": "class Solution {\n  int countSubIslands(List<List<int>> grid1, List<List<int>> grid2) {\n    \n  }\n}"}, {"value": "golang", "text": "Go", "defaultCode": "func countSubIslands(grid1 [][]int, grid2 [][]int) int {\n    \n}"}, {"value": "ruby", "text": "Ruby", "defaultCode": "# @param {Integer[][]} grid1\n# @param {Integer[][]} grid2\n# @return {Integer}\ndef count_sub_islands(grid1, grid2)\n    \nend"}, {"value": "scala", "text": "Scala", "defaultCode": "object Solution {\n    def countSubIslands(grid1: Array[Array[Int]], grid2: Array[Array[Int]]): Int = {\n        \n    }\n}"}, {"value": "rust", "text": "Rust", "defaultCode": "impl Solution {\n    pub fn count_sub_islands(grid1: Vec<Vec<i32>>, grid2: Vec<Vec<i32>>) -> i32 {\n        \n    }\n}"}, {"value": "racket", "text": "Racket", "defaultCode": "(define/contract (count-sub-islands grid1 grid2)\n  (-> (listof (listof exact-integer?)) (listof (listof exact-integer?)) exact-integer?)\n  )"}, {"value": "erlang", "text": "Erlang", "defaultCode": "-spec count_sub_islands(Grid1 :: [[integer()]], Grid2 :: [[integer()]]) -> integer().\ncount_sub_islands(Grid1, Grid2) ->\n  ."}, {"value": "elixir", "text": "Elixir", "defaultCode": "defmodule Solution do\n  @spec count_sub_islands(grid1 :: [[integer]], grid2 :: [[integer]]) :: integer\n  def count_sub_islands(grid1, grid2) do\n    \n  end\nend"}]
{
  "name": "countSubIslands",
  "params": [
    {
      "name": "grid1",
      "type": "integer[][]"
    },
    {
      "type": "integer[][]",
      "name": "grid2"
    }
  ],
  "return": {
    "type": "integer"
  }
}
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['Array', 'Depth-First Search', 'Breadth-First Search', 'Union Find', 'Matrix']