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"content": "<p>Given a <code>rows x cols</code> binary <code>matrix</code> filled with <code>0</code>'s and <code>1</code>'s, find the largest rectangle containing only <code>1</code>'s and return <em>its area</em>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/14/maximal.jpg\" style=\"width: 402px; height: 322px;\" />\n<pre>\n<strong>Input:</strong> matrix = [["1","0","1","0","0"],["1","0","1","1","1"],["1","1","1","1","1"],["1","0","0","1","0"]]\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> The maximal rectangle is shown in the above picture.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> matrix = [["0"]]\n<strong>Output:</strong> 0\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> matrix = [["1"]]\n<strong>Output:</strong> 1\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>rows == matrix.length</code></li>\n\t<li><code>cols == matrix[i].length</code></li>\n\t<li><code>1 <= row, cols <= 200</code></li>\n\t<li><code>matrix[i][j]</code> is <code>'0'</code> or <code>'1'</code>.</li>\n</ul>\n",
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