mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
195 lines
25 KiB
JSON
195 lines
25 KiB
JSON
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"title": "Detect Cycles in 2D Grid",
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"content": "<p>Given a 2D array of characters <code>grid</code> of size <code>m x n</code>, you need to find if there exists any cycle consisting of the <strong>same value</strong> in <code>grid</code>.</p>\n\n<p>A cycle is a path of <strong>length 4 or more</strong> in the grid that starts and ends at the same cell. From a given cell, you can move to one of the cells adjacent to it - in one of the four directions (up, down, left, or right), if it has the <strong>same value</strong> of the current cell.</p>\n\n<p>Also, you cannot move to the cell that you visited in your last move. For example, the cycle <code>(1, 1) -> (1, 2) -> (1, 1)</code> is invalid because from <code>(1, 2)</code> we visited <code>(1, 1)</code> which was the last visited cell.</p>\n\n<p>Return <code>true</code> if any cycle of the same value exists in <code>grid</code>, otherwise, return <code>false</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/07/15/1.png\" style=\"width: 231px; height: 152px;\" /></strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [["a","a","a","a"],["a","b","b","a"],["a","b","b","a"],["a","a","a","a"]]\n<strong>Output:</strong> true\n<strong>Explanation: </strong>There are two valid cycles shown in different colors in the image below:\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/07/15/11.png\" style=\"width: 225px; height: 163px;\" />\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/07/15/22.png\" style=\"width: 236px; height: 154px;\" /></strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [["c","c","c","a"],["c","d","c","c"],["c","c","e","c"],["f","c","c","c"]]\n<strong>Output:</strong> true\n<strong>Explanation: </strong>There is only one valid cycle highlighted in the image below:\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/07/15/2.png\" style=\"width: 229px; height: 157px;\" />\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/07/15/3.png\" style=\"width: 183px; height: 120px;\" /></strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [["a","b","b"],["b","z","b"],["b","b","a"]]\n<strong>Output:</strong> false\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>m == grid.length</code></li>\n\t<li><code>n == grid[i].length</code></li>\n\t<li><code>1 <= m, n <= 500</code></li>\n\t<li><code>grid</code> consists only of lowercase English letters.</li>\n</ul>\n",
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"translatedTitle": "二维网格图中探测环",
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"translatedContent": "<p>给你一个二维字符网格数组 <code>grid</code> ，大小为 <code>m x n</code> ，你需要检查 <code>grid</code> 中是否存在 <strong>相同值</strong> 形成的环。</p>\n\n<p>一个环是一条开始和结束于同一个格子的长度 <strong>大于等于 4</strong> 的路径。对于一个给定的格子，你可以移动到它上、下、左、右四个方向相邻的格子之一，可以移动的前提是这两个格子有 <strong>相同的值 </strong>。</p>\n\n<p>同时，你也不能回到上一次移动时所在的格子。比方说，环 <code>(1, 1) -> (1, 2) -> (1, 1)</code> 是不合法的，因为从 <code>(1, 2)</code> 移动到 <code>(1, 1)</code> 回到了上一次移动时的格子。</p>\n\n<p>如果 <code>grid</code> 中有相同值形成的环，请你返回 <code>true</code> ，否则返回 <code>false</code> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/08/22/5482e1.png\" style=\"height: 152px; width: 231px;\"></strong></p>\n\n<pre><strong>输入：</strong>grid = [["a","a","a","a"],["a","b","b","a"],["a","b","b","a"],["a","a","a","a"]]\n<strong>输出：</strong>true\n<strong>解释：</strong>如下图所示，有 2 个用不同颜色标出来的环：\n<img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/08/22/5482e11.png\" style=\"height: 163px; width: 225px;\">\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/08/22/5482e2.png\" style=\"height: 154px; width: 236px;\"></strong></p>\n\n<pre><strong>输入：</strong>grid = [["c","c","c","a"],["c","d","c","c"],["c","c","e","c"],["f","c","c","c"]]\n<strong>输出：</strong>true\n<strong>解释：</strong>如下图所示，只有高亮所示的一个合法环：\n<img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/08/22/5482e22.png\" style=\"height: 157px; width: 229px;\">\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<p><strong><img alt=\"\" src=\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/08/22/5482e3.png\" style=\"height: 120px; width: 183px;\"></strong></p>\n\n<pre><strong>输入：</strong>grid = [["a","b","b"],["b","z","b"],["b","b","a"]]\n<strong>输出：</strong>false\n</pre>\n\n<p> </p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>m == grid.length</code></li>\n\t<li><code>n == grid[i].length</code></li>\n\t<li><code>1 <= m <= 500</code></li>\n\t<li><code>1 <= n <= 500</code></li>\n\t<li><code>grid</code> 只包含小写英文字母。</li>\n</ul>\n",
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