mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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183 lines
26 KiB
JSON
183 lines
26 KiB
JSON
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"title": "Minimum Moves to Move a Box to Their Target Location",
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"content": "<p>A storekeeper is a game in which the player pushes boxes around in a warehouse trying to get them to target locations.</p>\n\n<p>The game is represented by an <code>m x n</code> grid of characters <code>grid</code> where each element is a wall, floor, or box.</p>\n\n<p>Your task is to move the box <code>'B'</code> to the target position <code>'T'</code> under the following rules:</p>\n\n<ul>\n\t<li>The character <code>'S'</code> represents the player. The player can move up, down, left, right in <code>grid</code> if it is a floor (empty cell).</li>\n\t<li>The character <code>'.'</code> represents the floor which means a free cell to walk.</li>\n\t<li>The character <code>'#' </code>represents the wall which means an obstacle (impossible to walk there).</li>\n\t<li>There is only one box <code>'B'</code> and one target cell <code>'T'</code> in the <code>grid</code>.</li>\n\t<li>The box can be moved to an adjacent free cell by standing next to the box and then moving in the direction of the box. This is a <strong>push</strong>.</li>\n\t<li>The player cannot walk through the box.</li>\n</ul>\n\n<p>Return <em>the minimum number of <strong>pushes</strong> to move the box to the target</em>. If there is no way to reach the target, return <code>-1</code>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/11/06/sample_1_1620.png\" style=\"width: 500px; height: 335px;\" />\n<pre>\n<strong>Input:</strong> grid = [["#","#","#","#","#","#"],\n ["#","T","#","#","#","#"],\n ["#",".",".","B",".","#"],\n ["#",".","#","#",".","#"],\n ["#",".",".",".","S","#"],\n ["#","#","#","#","#","#"]]\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> We return only the number of times the box is pushed.</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [["#","#","#","#","#","#"],\n ["#","T","#","#","#","#"],\n ["#",".",".","B",".","#"],\n ["#","#","#","#",".","#"],\n ["#",".",".",".","S","#"],\n ["#","#","#","#","#","#"]]\n<strong>Output:</strong> -1\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [["#","#","#","#","#","#"],\n ["#","T",".",".","#","#"],\n ["#",".","#","B",".","#"],\n ["#",".",".",".",".","#"],\n ["#",".",".",".","S","#"],\n ["#","#","#","#","#","#"]]\n<strong>Output:</strong> 5\n<strong>Explanation:</strong> push the box down, left, left, up and up.\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 <= 20</code></li>\n\t<li><code>grid</code> contains only characters <code>'.'</code>, <code>'#'</code>, <code>'S'</code>, <code>'T'</code>, or <code>'B'</code>.</li>\n\t<li>There is only one character <code>'S'</code>, <code>'B'</code>, and <code>'T'</code> in the <code>grid</code>.</li>\n</ul>\n",
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"translatedTitle": "推箱子",
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"We represent the search state as (player_row, player_col, box_row, box_col).",
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