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"translatedContent": "<p>给你一个由若干 <code>0</code> 和 <code>1</code> 组成的二维网格&nbsp;<code>grid</code>,请你找出边界全部由 <code>1</code> 组成的最大 <strong>正方形</strong> 子网格,并返回该子网格中的元素数量。如果不存在,则返回 <code>0</code>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1</strong></p>\n\n<pre><strong>输入:</strong>grid = [[1,1,1],[1,0,1],[1,1,1]]\n<strong>输出:</strong>9\n</pre>\n\n<p><strong>示例 2</strong></p>\n\n<pre><strong>输入:</strong>grid = [[1,1,0,0]]\n<strong>输出:</strong>1\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= grid.length &lt;= 100</code></li>\n\t<li><code>1 &lt;= grid[0].length &lt;= 100</code></li>\n\t<li><code>grid[i][j]</code> 为&nbsp;<code>0</code>&nbsp;或&nbsp;<code>1</code></li>\n</ul>\n",
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"difficulty": "Medium",
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"hints": [
"For each square, know how many ones are up, left, down, and right of this square. You can find it in O(N^2) using dynamic programming.",
"Now for each square ( O(N^3) ), we can evaluate whether that square is 1-bordered in O(1)."