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

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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",
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