mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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187 lines
17 KiB
JSON
187 lines
17 KiB
JSON
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"questionId": "1414",
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"title": "Shortest Path in a Grid with Obstacles Elimination",
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"content": "<p>You are given an <code>m x n</code> integer matrix <code>grid</code> where each cell is either <code>0</code> (empty) or <code>1</code> (obstacle). You can move up, down, left, or right from and to an empty cell in <strong>one step</strong>.</p>\n\n<p>Return <em>the minimum number of <strong>steps</strong> to walk from the upper left corner </em><code>(0, 0)</code><em> to the lower right corner </em><code>(m - 1, n - 1)</code><em> given that you can eliminate <strong>at most</strong> </em><code>k</code><em> obstacles</em>. If it is not possible to find such walk return <code>-1</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/09/30/short1-grid.jpg\" style=\"width: 244px; height: 405px;\" />\n<pre>\n<strong>Input:</strong> grid = [[0,0,0],[1,1,0],[0,0,0],[0,1,1],[0,0,0]], k = 1\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> \nThe shortest path without eliminating any obstacle is 10.\nThe shortest path with one obstacle elimination at position (3,2) is 6. Such path is (0,0) -> (0,1) -> (0,2) -> (1,2) -> (2,2) -> <strong>(3,2)</strong> -> (4,2).\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/09/30/short2-grid.jpg\" style=\"width: 244px; height: 245px;\" />\n<pre>\n<strong>Input:</strong> grid = [[0,1,1],[1,1,1],[1,0,0]], k = 1\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> We need to eliminate at least two obstacles to find such a walk.\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 <= 40</code></li>\n\t<li><code>1 <= k <= m * n</code></li>\n\t<li><code>grid[i][j]</code> is either <code>0</code> <strong>or</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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"code": "# @param {Integer[][]} grid\n# @param {Integer} k\n# @return {Integer}\ndef shortest_path(grid, k)\n \nend",
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"code": "impl Solution {\n pub fn shortest_path(grid: Vec<Vec<i32>>, k: i32) -> i32 {\n \n }\n}",
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"code": "(define/contract (shortest-path grid k)\n (-> (listof (listof exact-integer?)) exact-integer? exact-integer?)\n )",
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"code": "-spec shortest_path(Grid :: [[integer()]], K :: integer()) -> integer().\nshortest_path(Grid, K) ->\n .",
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"code": "defmodule Solution do\n @spec shortest_path(grid :: [[integer]], k :: integer) :: integer\n def shortest_path(grid, k) do\n \n end\nend",
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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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