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"translatedContent": "<p>给你一个下标从 <strong>1</strong>&nbsp;开始的二进制矩阵,其中&nbsp;<code>0</code>&nbsp;表示陆地,<code>1</code>&nbsp;表示水域。同时给你&nbsp;<code>row</code> 和&nbsp;<code>col</code>&nbsp;分别表示矩阵中行和列的数目。</p>\n\n<p>一开始在第&nbsp;<code>0</code>&nbsp;天,<strong>整个</strong>&nbsp;矩阵都是&nbsp;<strong>陆地</strong>&nbsp;。但每一天都会有一块新陆地被&nbsp;<strong>水</strong>&nbsp;淹没变成水域。给你一个下标从&nbsp;<strong>1</strong>&nbsp;开始的二维数组&nbsp;<code>cells</code>&nbsp;,其中&nbsp;<code>cells[i] = [r<sub>i</sub>, c<sub>i</sub>]</code>&nbsp;表示在第&nbsp;<code>i</code>&nbsp;天,第&nbsp;<code>r<sub>i</sub></code>&nbsp;行&nbsp;<code>c<sub>i</sub></code>&nbsp;列(下标都是从 <strong>1</strong>&nbsp;开始)的陆地会变成 <strong>水域</strong>&nbsp;(也就是 <code>0</code>&nbsp;变成 <code>1</code>&nbsp;)。</p>\n\n<p>你想知道从矩阵最 <strong>上面</strong>&nbsp;一行走到最 <strong>下面</strong>&nbsp;一行,且只经过陆地格子的 <strong>最后一天</strong>&nbsp;是哪一天。你可以从最上面一行的&nbsp;<strong>任意</strong>&nbsp;格子出发,到达最下面一行的&nbsp;<strong>任意</strong>&nbsp;格子。你只能沿着&nbsp;<strong>四个</strong>&nbsp;基本方向移动(也就是上下左右)。</p>\n\n<p>请返回只经过陆地格子能从最 <strong>上面</strong>&nbsp;一行走到最 <strong>下面</strong>&nbsp;一行的 <strong>最后一天</strong>&nbsp;。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/07/27/1.png\" style=\"width: 624px; height: 162px;\">\n<pre><b>输入:</b>row = 2, col = 2, cells = [[1,1],[2,1],[1,2],[2,2]]\n<b>输出:</b>2\n<b>解释:</b>上图描述了矩阵从第 0 天开始是如何变化的。\n可以从最上面一行到最下面一行的最后一天是第 2 天。\n</pre>\n\n<p><strong>示例 2</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/07/27/2.png\" style=\"width: 504px; height: 178px;\">\n<pre><b>输入:</b>row = 2, col = 2, cells = [[1,1],[1,2],[2,1],[2,2]]\n<b>输出:</b>1\n<b>解释:</b>上图描述了矩阵从第 0 天开始是如何变化的。\n可以从最上面一行到最下面一行的最后一天是第 1 天。\n</pre>\n\n<p><strong>示例 3</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/07/27/3.png\" style=\"width: 666px; height: 167px;\">\n<pre><b>输入:</b>row = 3, col = 3, cells = [[1,2],[2,1],[3,3],[2,2],[1,1],[1,3],[2,3],[3,2],[3,1]]\n<b>输出:</b>3\n<b>解释:</b>上图描述了矩阵从第 0 天开始是如何变化的。\n可以从最上面一行到最下面一行的最后一天是第 3 天。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= row, col &lt;= 2 * 10<sup>4</sup></code></li>\n\t<li><code>4 &lt;= row * col &lt;= 2 * 10<sup>4</sup></code></li>\n\t<li><code>cells.length == row * col</code></li>\n\t<li><code>1 &lt;= r<sub>i</sub> &lt;= row</code></li>\n\t<li><code>1 &lt;= c<sub>i</sub> &lt;= col</code></li>\n\t<li><code>cells</code>&nbsp;中的所有格子坐标都是 <strong>唯一</strong>&nbsp;的。</li>\n</ul>\n",
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"hints": [
"What graph algorithm allows us to find whether a path exists?",
"Can we use binary search to help us solve the problem?"