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"translatedContent": "<p>给你一个 <code>m * n</code> 的网格,其中每个单元格不是 <code>0</code>(空)就是 <code>1</code>(障碍物)。每一步,您都可以在空白单元格中上、下、左、右移动。</p>\n\n<p>如果您 <strong>最多</strong> 可以消除 <code>k</code> 个障碍物,请找出从左上角 <code>(0, 0)</code> 到右下角 <code>(m-1, n-1)</code> 的最短路径,并返回通过该路径所需的步数。如果找不到这样的路径,则返回 <code>-1</code> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2021/09/30/short1-grid.jpg\" /></p>\n\n<pre>\n<strong>输入:</strong> grid = [[0,0,0],[1,1,0],[0,0,0],[0,1,1],[0,0,0]], k = 1\n<strong>输出:</strong>6\n<strong>解释:\n</strong>不消除任何障碍的最短路径是 10。\n消除位置 (3,2) 处的障碍后,最短路径是 6 。该路径是 <code>(0,0) -> (0,1) -> (0,2) -> (1,2) -> (2,2) -> <strong>(3,2)</strong> -> (4,2)</code>.\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<p><img src=\"https://assets.leetcode.com/uploads/2021/09/30/short2-grid.jpg\" /></p>\n\n<pre>\n<strong>输入:</strong>grid = [[0,1,1],[1,1,1],[1,0,0]], k = 1\n<strong>输出:</strong>-1\n<strong>解释:</strong>我们至少需要消除两个障碍才能找到这样的路径。\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>grid.length == m</code></li>\n\t<li><code>grid[0].length == n</code></li>\n\t<li><code>1 <= m, n <= 40</code></li>\n\t<li><code>1 <= k <= m*n</code></li>\n\t<li><code>grid[i][j]</code> 是 <code>0</code> 或<strong> </strong><code>1</code></li>\n\t<li><code>grid[0][0] == grid[m-1][n-1] == 0</code></li>\n</ul>\n",
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"difficulty": "Hard",
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"similarQuestions": "[]",
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@@ -149,7 +149,7 @@
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"hints": [
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"Use BFS.",
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"BFS on (x,y,r) x,y is coordinate, r is remain number of obstacles you can remove."
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