leetcode-problemset/leetcode-cn/originData/grid-teleportation-traversal.json

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        "question": {
            "questionId": "3837",
            "questionFrontendId": "3552",
            "categoryTitle": "Algorithms",
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            "title": "Grid Teleportation Traversal",
            "titleSlug": "grid-teleportation-traversal",
            "content": "<p>You are given a 2D character grid <code>matrix</code> of size <code>m x n</code>, represented as an array of strings, where <code>matrix[i][j]</code> represents the cell at the intersection of the <code>i<sup>th</sup></code> row and <code>j<sup>th</sup></code> column. Each cell is one of the following:</p>\n\n<ul>\n\t<li><code>&#39;.&#39;</code> representing an empty cell.</li>\n\t<li><code>&#39;#&#39;</code> representing an obstacle.</li>\n\t<li>An uppercase letter (<code>&#39;A&#39;</code>-<code>&#39;Z&#39;</code>) representing a teleportation portal.</li>\n</ul>\n\n<p>You start at the top-left cell <code>(0, 0)</code>, and your goal is to reach the bottom-right cell <code>(m - 1, n - 1)</code>. You can move from the current cell to any adjacent cell (up, down, left, right) as long as the destination cell is within the grid bounds and is not an obstacle<strong>.</strong></p>\n\n<p>If you step on a cell containing a portal letter and you haven&#39;t used that portal letter before, you may instantly teleport to any other cell in the grid with the same letter. This teleportation does not count as a move, but each portal letter can be used<strong> at most </strong>once during your journey.</p>\n\n<p>Return the <strong>minimum</strong> number of moves required to reach the bottom-right cell. If it is not possible to reach the destination, return <code>-1</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">matrix = [&quot;A..&quot;,&quot;.A.&quot;,&quot;...&quot;]</span></p>\n\n<p><strong>Output:</strong> 2</p>\n\n<p><strong>Explanation:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2025/03/15/example04140.png\" style=\"width: 151px; height: 151px;\" /></p>\n\n<ul>\n\t<li>Before the first move, teleport from <code>(0, 0)</code> to <code>(1, 1)</code>.</li>\n\t<li>In the first move, move from <code>(1, 1)</code> to <code>(1, 2)</code>.</li>\n\t<li>In the second move, move from <code>(1, 2)</code> to <code>(2, 2)</code>.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">matrix = [&quot;.#...&quot;,&quot;.#.#.&quot;,&quot;.#.#.&quot;,&quot;...#.&quot;]</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">13</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2025/03/15/ezgifcom-animated-gif-maker.gif\" style=\"width: 251px; height: 201px;\" /></p>\n</div>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= m == matrix.length &lt;= 10<sup>3</sup></code></li>\n\t<li><code>1 &lt;= n == matrix[i].length &lt;= 10<sup>3</sup></code></li>\n\t<li><code>matrix[i][j]</code> is either <code>&#39;#&#39;</code>, <code>&#39;.&#39;</code>, or an uppercase English letter.</li>\n\t<li><code>matrix[0][0]</code> is not an obstacle.</li>\n</ul>\n",
            "translatedTitle": "网格传送门旅游",
            "translatedContent": "<p>给你一个大小为 <code>m x n</code> 的二维字符网格 <code>matrix</code>，用字符串数组表示，其中 <code>matrix[i][j]</code> 表示第 <code>i</code>&nbsp;行和第 <code>j</code>&nbsp;列处的单元格。每个单元格可以是以下几种字符之一：</p>\n\n<ul>\n\t<li><code>'.'</code> 表示一个空单元格。</li>\n\t<li><code>'#'</code> 表示一个障碍物。</li>\n\t<li>一个大写字母（<code>'A'</code> 到 <code>'Z'</code>）表示一个传送门。</li>\n</ul>\n\n<p>你从左上角单元格 <code>(0, 0)</code> 出发，目标是到达右下角单元格 <code>(m - 1, n - 1)</code>。你可以从当前位置移动到相邻的单元格（上、下、左、右），移动后的单元格必须在网格边界内且不是障碍物<strong>。</strong></p>\n\n<p>如果你踏入一个包含传送门字母的单元格，并且你之前没有使用过该传送门字母，你可以立即传送到网格中另一个具有相同字母的单元格。这次传送不计入移动次数，但每个字母对应的传送门在旅程中&nbsp;<strong>最多&nbsp;</strong>只能使用一次。</p>\n\n<p>返回到达右下角单元格所需的&nbsp;<strong>最少&nbsp;</strong>移动次数。如果无法到达目的地，则返回 <code>-1</code>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong class=\"example\">示例 1：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">matrix = [\"A..\",\".A.\",\"...\"]</span></p>\n\n<p><strong>输出：</strong> 2</p>\n\n<p><strong>解释：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2025/03/15/example04140.png\" style=\"width: 151px; height: 151px;\" /></p>\n\n<ul>\n\t<li>在第一次移动之前，从 <code>(0, 0)</code> 传送到 <code>(1, 1)</code>。</li>\n\t<li>第一次移动，从 <code>(1, 1)</code> 移动到 <code>(1, 2)</code>。</li>\n\t<li>第二次移动，从 <code>(1, 2)</code> 移动到 <code>(2, 2)</code>。</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">示例 2：</strong></p>\n\n<div class=\"example-block\">\n<p><strong>输入：</strong> <span class=\"example-io\">matrix = [\".#...\",\".#.#.\",\".#.#.\",\"...#.\"]</span></p>\n\n<p><strong>输出：</strong> <span class=\"example-io\">13</span></p>\n\n<p><strong>解释：</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2025/03/15/ezgifcom-animated-gif-maker.gif\" style=\"width: 251px; height: 201px;\" /></p>\n</div>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= m == matrix.length &lt;= 10<sup>3</sup></code></li>\n\t<li><code>1 &lt;= n == matrix[i].length &lt;= 10<sup>3</sup></code></li>\n\t<li><code>matrix[i][j]</code> 是 <code>'#'</code>、<code>'.'</code> 或一个大写英文字母。</li>\n\t<li><code>matrix[0][0]</code> 不是障碍物。</li>\n</ul>\n",
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            "hints": [
                "Treat all portals with the same letter as connected-like one big super-node.",
                "Each portal letter is used at most once, but that doesn't affect correctness since we visit each cell only once in the shortest path.",
                "Use Breadth-First Search to find the minimum number of moves."
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target=\\\"_blank\\\">\\u300c\\u4ed3\\u9889\\u7f16\\u7a0b\\u8bed\\u8a00\\u5f00\\u53d1\\u6307\\u5357\\u300d<\\/a><\\/p>\"]}",
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