leetcode-problemset/leetcode-cn/originData/number-of-closed-islands.json

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            "title": "Number of Closed Islands",
            "titleSlug": "number-of-closed-islands",
            "content": "<p>Given a 2D&nbsp;<code>grid</code> consists of <code>0s</code> (land)&nbsp;and <code>1s</code> (water).&nbsp; An <em>island</em> is a maximal 4-directionally connected group of <code><font face=\"monospace\">0</font>s</code> and a <em>closed island</em>&nbsp;is an island <strong>totally</strong>&nbsp;(all left, top, right, bottom) surrounded by <code>1s.</code></p>\n\n<p>Return the number of <em>closed islands</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/10/31/sample_3_1610.png\" style=\"width: 240px; height: 120px;\" /></p>\n\n<pre>\n<strong>Input:</strong> grid = [[1,1,1,1,1,1,1,0],[1,0,0,0,0,1,1,0],[1,0,1,0,1,1,1,0],[1,0,0,0,0,1,0,1],[1,1,1,1,1,1,1,0]]\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> \nIslands in gray are closed because they are completely surrounded by water (group of 1s).</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/10/31/sample_4_1610.png\" style=\"width: 160px; height: 80px;\" /></p>\n\n<pre>\n<strong>Input:</strong> grid = [[0,0,1,0,0],[0,1,0,1,0],[0,1,1,1,0]]\n<strong>Output:</strong> 1\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [[1,1,1,1,1,1,1],\n&nbsp;              [1,0,0,0,0,0,1],\n&nbsp;              [1,0,1,1,1,0,1],\n&nbsp;              [1,0,1,0,1,0,1],\n&nbsp;              [1,0,1,1,1,0,1],\n&nbsp;              [1,0,0,0,0,0,1],\n               [1,1,1,1,1,1,1]]\n<strong>Output:</strong> 2\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= grid.length, grid[0].length &lt;= 100</code></li>\n\t<li><code>0 &lt;= grid[i][j] &lt;=1</code></li>\n</ul>\n",
            "translatedTitle": "统计封闭岛屿的数目",
            "translatedContent": "<p>二维矩阵 <code>grid</code>&nbsp;由 <code>0</code>&nbsp;（土地）和 <code>1</code>&nbsp;（水）组成。岛是由最大的4个方向连通的 <code>0</code>&nbsp;组成的群，封闭岛是一个&nbsp;<code>完全</code> 由1包围（左、上、右、下）的岛。</p>\n\n<p>请返回 <em>封闭岛屿</em> 的数目。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/10/31/sample_3_1610.png\" style=\"height: 151px; width: 240px;\" /></p>\n\n<pre>\n<strong>输入：</strong>grid = [[1,1,1,1,1,1,1,0],[1,0,0,0,0,1,1,0],[1,0,1,0,1,1,1,0],[1,0,0,0,0,1,0,1],[1,1,1,1,1,1,1,0]]\n<strong>输出：</strong>2\n<strong>解释：</strong>\n灰色区域的岛屿是封闭岛屿，因为这座岛屿完全被水域包围（即被 1 区域包围）。</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><img src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/11/07/sample_4_1610.png\" style=\"height: 98px; width: 160px;\" /></p>\n\n<pre>\n<strong>输入：</strong>grid = [[0,0,1,0,0],[0,1,0,1,0],[0,1,1,1,0]]\n<strong>输出：</strong>1\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre>\n<strong>输入：</strong>grid = [[1,1,1,1,1,1,1],\n&nbsp;            [1,0,0,0,0,0,1],\n&nbsp;            [1,0,1,1,1,0,1],\n&nbsp;            [1,0,1,0,1,0,1],\n&nbsp;            [1,0,1,1,1,0,1],\n&nbsp;            [1,0,0,0,0,0,1],\n             [1,1,1,1,1,1,1]]\n<strong>输出：</strong>2\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= grid.length, grid[0].length &lt;= 100</code></li>\n\t<li><code>0 &lt;= grid[i][j] &lt;=1</code></li>\n</ul>\n",
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