leetcode-problemset/leetcode-cn/originData/cherry-pickup.json

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            "questionId": "741",
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            "title": "Cherry Pickup",
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            "content": "<p>You are given an <code>n x n</code> <code>grid</code> representing a field of cherries, each cell is one of three possible integers.</p>\n\n<ul>\n\t<li><code>0</code> means the cell is empty, so you can pass through,</li>\n\t<li><code>1</code> means the cell contains a cherry that you can pick up and pass through, or</li>\n\t<li><code>-1</code> means the cell contains a thorn that blocks your way.</li>\n</ul>\n\n<p>Return <em>the maximum number of cherries you can collect by following the rules below</em>:</p>\n\n<ul>\n\t<li>Starting at the position <code>(0, 0)</code> and reaching <code>(n - 1, n - 1)</code> by moving right or down through valid path cells (cells with value <code>0</code> or <code>1</code>).</li>\n\t<li>After reaching <code>(n - 1, n - 1)</code>, returning to <code>(0, 0)</code> by moving left or up through valid path cells.</li>\n\t<li>When passing through a path cell containing a cherry, you pick it up, and the cell becomes an empty cell <code>0</code>.</li>\n\t<li>If there is no valid path between <code>(0, 0)</code> and <code>(n - 1, n - 1)</code>, then no cherries can be collected.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/12/14/grid.jpg\" style=\"width: 242px; height: 242px;\" />\n<pre>\n<strong>Input:</strong> grid = [[0,1,-1],[1,0,-1],[1,1,1]]\n<strong>Output:</strong> 5\n<strong>Explanation:</strong> The player started at (0, 0) and went down, down, right right to reach (2, 2).\n4 cherries were picked up during this single trip, and the matrix becomes [[0,1,-1],[0,0,-1],[0,0,0]].\nThen, the player went left, up, up, left to return home, picking up one more cherry.\nThe total number of cherries picked up is 5, and this is the maximum possible.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> grid = [[1,1,-1],[1,-1,1],[-1,1,1]]\n<strong>Output:</strong> 0\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == grid.length</code></li>\n\t<li><code>n == grid[i].length</code></li>\n\t<li><code>1 &lt;= n &lt;= 50</code></li>\n\t<li><code>grid[i][j]</code> is <code>-1</code>, <code>0</code>, or <code>1</code>.</li>\n\t<li><code>grid[0][0] != -1</code></li>\n\t<li><code>grid[n - 1][n - 1] != -1</code></li>\n</ul>\n",
            "translatedTitle": "摘樱桃",
            "translatedContent": "<p>一个N x N的网格<code>(grid)</code>&nbsp;代表了一块樱桃地，每个格子由以下三种数字的一种来表示：</p>\n\n<ul>\n\t<li>0 表示这个格子是空的，所以你可以穿过它。</li>\n\t<li>1 表示这个格子里装着一个樱桃，你可以摘到樱桃然后穿过它。</li>\n\t<li>-1 表示这个格子里有荆棘，挡着你的路。</li>\n</ul>\n\n<p>你的任务是在遵守下列规则的情况下，尽可能的摘到最多樱桃：</p>\n\n<ul>\n\t<li>从位置&nbsp;(0, 0) 出发，最后到达 (N-1, N-1) ，只能向下或向右走，并且只能穿越有效的格子（即只可以穿过值为0或者1的格子）；</li>\n\t<li>当到达 (N-1, N-1) 后，你要继续走，直到返回到 (0, 0) ，只能向上或向左走，并且只能穿越有效的格子；</li>\n\t<li>当你经过一个格子且这个格子包含一个樱桃时，你将摘到樱桃并且这个格子会变成空的（值变为0）；</li>\n\t<li>如果在 (0, 0) 和 (N-1, N-1) 之间不存在一条可经过的路径，则没有任何一个樱桃能被摘到。</li>\n</ul>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong> grid =\n[[0, 1, -1],\n [1, 0, -1],\n [1, 1,  1]]\n<strong>输出:</strong> 5\n<strong>解释：</strong> \n玩家从（0,0）点出发，经过了向下走，向下走，向右走，向右走，到达了点(2, 2)。\n在这趟单程中，总共摘到了4颗樱桃，矩阵变成了[[0,1,-1],[0,0,-1],[0,0,0]]。\n接着，这名玩家向左走，向上走，向上走，向左走，返回了起始点，又摘到了1颗樱桃。\n在旅程中，总共摘到了5颗樱桃，这是可以摘到的最大值了。\n</pre>\n\n<p><strong>说明:</strong></p>\n\n<ul>\n\t<li><code>grid</code> 是一个&nbsp;<code>N</code> * <code>N</code> 的二维数组，N的取值范围是<code>1 &lt;= N &lt;= 50</code>。</li>\n\t<li>每一个&nbsp;<code>grid[i][j]</code> 都是集合&nbsp;<code>{-1, 0, 1}</code>其中的一个数。</li>\n\t<li>可以保证起点&nbsp;<code>grid[0][0]</code>&nbsp;和终点&nbsp;<code>grid[N-1][N-1]</code>&nbsp;的值都不会是 -1。</li>\n</ul>\n",
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