leetcode-problemset/leetcode-cn/originData/count-unguarded-cells-in-the-grid.json

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        "question": {
            "questionId": "2343",
            "questionFrontendId": "2257",
            "categoryTitle": "Algorithms",
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            "title": "Count Unguarded Cells in the Grid",
            "titleSlug": "count-unguarded-cells-in-the-grid",
            "content": "<p>You are given two integers <code>m</code> and <code>n</code> representing a <strong>0-indexed</strong> <code>m x n</code> grid. You are also given two 2D integer arrays <code>guards</code> and <code>walls</code> where <code>guards[i] = [row<sub>i</sub>, col<sub>i</sub>]</code> and <code>walls[j] = [row<sub>j</sub>, col<sub>j</sub>]</code> represent the positions of the <code>i<sup>th</sup></code> guard and <code>j<sup>th</sup></code> wall respectively.</p>\n\n<p>A guard can see <b>every</b> cell in the four cardinal directions (north, east, south, or west) starting from their position unless <strong>obstructed</strong> by a wall or another guard. A cell is <strong>guarded</strong> if there is <strong>at least</strong> one guard that can see it.</p>\n\n<p>Return<em> the number of unoccupied cells that are <strong>not</strong> <strong>guarded</strong>.</em></p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/03/10/example1drawio2.png\" style=\"width: 300px; height: 204px;\" />\n<pre>\n<strong>Input:</strong> m = 4, n = 6, guards = [[0,0],[1,1],[2,3]], walls = [[0,1],[2,2],[1,4]]\n<strong>Output:</strong> 7\n<strong>Explanation:</strong> The guarded and unguarded cells are shown in red and green respectively in the above diagram.\nThere are a total of 7 unguarded cells, so we return 7.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/03/10/example2drawio.png\" style=\"width: 200px; height: 201px;\" />\n<pre>\n<strong>Input:</strong> m = 3, n = 3, guards = [[1,1]], walls = [[0,1],[1,0],[2,1],[1,2]]\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> The unguarded cells are shown in green in the above diagram.\nThere are a total of 4 unguarded cells, so we return 4.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= m, n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>2 &lt;= m * n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= guards.length, walls.length &lt;= 5 * 10<sup>4</sup></code></li>\n\t<li><code>2 &lt;= guards.length + walls.length &lt;= m * n</code></li>\n\t<li><code>guards[i].length == walls[j].length == 2</code></li>\n\t<li><code>0 &lt;= row<sub>i</sub>, row<sub>j</sub> &lt; m</code></li>\n\t<li><code>0 &lt;= col<sub>i</sub>, col<sub>j</sub> &lt; n</code></li>\n\t<li>All the positions in <code>guards</code> and <code>walls</code> are <strong>unique</strong>.</li>\n</ul>\n",
            "translatedTitle": "统计网格图中没有被保卫的格子数",
            "translatedContent": "<p>给你两个整数&nbsp;<code>m</code>&nbsp;和&nbsp;<code>n</code>&nbsp;表示一个下标从<strong>&nbsp;0</strong>&nbsp;开始的&nbsp;<code>m x n</code>&nbsp;网格图。同时给你两个二维整数数组&nbsp;<code>guards</code> 和&nbsp;<code>walls</code>&nbsp;，其中&nbsp;<code>guards[i] = [row<sub>i</sub>, col<sub>i</sub>]</code>&nbsp;且&nbsp;<code>walls[j] = [row<sub>j</sub>, col<sub>j</sub>]</code>&nbsp;，分别表示第 <code>i</code>&nbsp;个警卫和第 <code>j</code>&nbsp;座墙所在的位置。</p>\n\n<p>一个警卫能看到 4 个坐标轴方向（即东、南、西、北）的 <strong>所有</strong>&nbsp;格子，除非他们被一座墙或者另外一个警卫 <strong>挡住</strong>&nbsp;了视线。如果一个格子能被 <strong>至少</strong>&nbsp;一个警卫看到，那么我们说这个格子被 <strong>保卫</strong>&nbsp;了。</p>\n\n<p>请你返回空格子中，有多少个格子是 <strong>没被保卫</strong>&nbsp;的。</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/2022/03/10/example1drawio2.png\" style=\"width: 300px; height: 204px;\"></p>\n\n<pre><b>输入：</b>m = 4, n = 6, guards = [[0,0],[1,1],[2,3]], walls = [[0,1],[2,2],[1,4]]\n<b>输出：</b>7\n<strong>解释：</strong>上图中，被保卫和没有被保卫的格子分别用红色和绿色表示。\n总共有 7 个没有被保卫的格子，所以我们返回 7 。\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2022/03/10/example2drawio.png\" style=\"width: 200px; height: 201px;\"></p>\n\n<pre><b>输入：</b>m = 3, n = 3, guards = [[1,1]], walls = [[0,1],[1,0],[2,1],[1,2]]\n<b>输出：</b>4\n<b>解释：</b>上图中，没有被保卫的格子用绿色表示。\n总共有 4 个没有被保卫的格子，所以我们返回 4 。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= m, n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>2 &lt;= m * n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= guards.length, walls.length &lt;= 5 * 10<sup>4</sup></code></li>\n\t<li><code>2 &lt;= guards.length + walls.length &lt;= m * n</code></li>\n\t<li><code>guards[i].length == walls[j].length == 2</code></li>\n\t<li><code>0 &lt;= row<sub>i</sub>, row<sub>j</sub> &lt; m</code></li>\n\t<li><code>0 &lt;= col<sub>i</sub>, col<sub>j</sub> &lt; n</code></li>\n\t<li><code>guards</code>&nbsp;和&nbsp;<code>walls</code>&nbsp;中所有位置 <strong>互不相同</strong>&nbsp;。</li>\n</ul>\n",
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                    "code": "class Solution {\npublic:\n    int countUnguarded(int m, int n, vector<vector<int>>& guards, vector<vector<int>>& walls) {\n        \n    }\n};",
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                    "code": "class Solution(object):\n    def countUnguarded(self, m, n, guards, walls):\n        \"\"\"\n        :type m: int\n        :type n: int\n        :type guards: List[List[int]]\n        :type walls: List[List[int]]\n        :rtype: int\n        \"\"\"",
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