mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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156 lines
16 KiB
JSON
156 lines
16 KiB
JSON
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"title": "Minimum Moves to Reach Target with Rotations",
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"content": "<p>In an <code>n*n</code> grid, there is a snake that spans 2 cells and starts moving from the top left corner at <code>(0, 0)</code> and <code>(0, 1)</code>. The grid has empty cells represented by zeros and blocked cells represented by ones. The snake wants to reach the lower right corner at <code>(n-1, n-2)</code> and <code>(n-1, n-1)</code>.</p>\n\n<p>In one move the snake can:</p>\n\n<ul>\n\t<li>Move one cell to the right if there are no blocked cells there. This move keeps the horizontal/vertical position of the snake as it is.</li>\n\t<li>Move down one cell if there are no blocked cells there. This move keeps the horizontal/vertical position of the snake as it is.</li>\n\t<li>Rotate clockwise if it's in a horizontal position and the two cells under it are both empty. In that case the snake moves from <code>(r, c)</code> and <code>(r, c+1)</code> to <code>(r, c)</code> and <code>(r+1, c)</code>.<br />\n\t<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/09/24/image-2.png\" style=\"width: 300px; height: 134px;\" /></li>\n\t<li>Rotate counterclockwise if it's in a vertical position and the two cells to its right are both empty. In that case the snake moves from <code>(r, c)</code> and <code>(r+1, c)</code> to <code>(r, c)</code> and <code>(r, c+1)</code>.<br />\n\t<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/09/24/image-1.png\" style=\"width: 300px; height: 121px;\" /></li>\n</ul>\n\n<p>Return the minimum number of moves to reach the target.</p>\n\n<p>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\n<p><strong><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2019/09/24/image.png\" style=\"width: 400px; height: 439px;\" /></strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [[0,0,0,0,0,1],\n [1,1,0,0,1,0],\n [0,0,0,0,1,1],\n [0,0,1,0,1,0],\n [0,1,1,0,0,0],\n [0,1,1,0,0,0]]\n<strong>Output:</strong> 11\n<strong>Explanation:\n</strong>One possible solution is [right, right, rotate clockwise, right, down, down, down, down, rotate counterclockwise, right, down].\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [[0,0,1,1,1,1],\n [0,0,0,0,1,1],\n [1,1,0,0,0,1],\n [1,1,1,0,0,1],\n [1,1,1,0,0,1],\n [1,1,1,0,0,0]]\n<strong>Output:</strong> 9\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 <= n <= 100</code></li>\n\t<li><code>0 <= grid[i][j] <= 1</code></li>\n\t<li>It is guaranteed that the snake starts at empty cells.</li>\n</ul>\n",
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"Use BFS to find the answer.",
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"The state of the BFS is the position (x, y) along with a binary value that specifies if the position is horizontal or vertical."
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