mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
37 lines
1.7 KiB
HTML
37 lines
1.7 KiB
HTML
<p>You are given an <code>m x n</code> binary grid <code>grid</code> where <code>1</code> represents land and <code>0</code> represents water. An <strong>island</strong> is a maximal <strong>4-directionally</strong> (horizontal or vertical) connected group of <code>1</code>'s.</p>
|
|
|
|
<p>The grid is said to be <strong>connected</strong> if we have <strong>exactly one island</strong>, otherwise is said <strong>disconnected</strong>.</p>
|
|
|
|
<p>In one day, we are allowed to change <strong>any </strong>single land cell <code>(1)</code> into a water cell <code>(0)</code>.</p>
|
|
|
|
<p>Return <em>the minimum number of days to disconnect the grid</em>.</p>
|
|
|
|
<p> </p>
|
|
<p><strong class="example">Example 1:</strong></p>
|
|
<img alt="" src="https://assets.leetcode.com/uploads/2021/12/24/land1.jpg" style="width: 500px; height: 169px;" />
|
|
<pre>
|
|
<strong>Input:</strong> grid = [[0,1,1,0],[0,1,1,0],[0,0,0,0]]
|
|
|
|
<strong>Output:</strong> 2
|
|
<strong>Explanation:</strong> We need at least 2 days to get a disconnected grid.
|
|
Change land grid[1][1] and grid[0][2] to water and get 2 disconnected island.
|
|
</pre>
|
|
|
|
<p><strong class="example">Example 2:</strong></p>
|
|
<img alt="" src="https://assets.leetcode.com/uploads/2021/12/24/land2.jpg" style="width: 404px; height: 85px;" />
|
|
<pre>
|
|
<strong>Input:</strong> grid = [[1,1]]
|
|
<strong>Output:</strong> 2
|
|
<strong>Explanation:</strong> Grid of full water is also disconnected ([[1,1]] -> [[0,0]]), 0 islands.
|
|
</pre>
|
|
|
|
<p> </p>
|
|
<p><strong>Constraints:</strong></p>
|
|
|
|
<ul>
|
|
<li><code>m == grid.length</code></li>
|
|
<li><code>n == grid[i].length</code></li>
|
|
<li><code>1 <= m, n <= 30</code></li>
|
|
<li><code>grid[i][j]</code> is either <code>0</code> or <code>1</code>.</li>
|
|
</ul>
|