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<p>Given a 2D <code>grid</code> of <code>0</code>s and <code>1</code>s, return the number of elements in the largest <strong>square</strong> subgrid that has all <code>1</code>s on its <strong>border</strong>, or <code>0</code> if such a subgrid doesn't exist in the <code>grid</code>.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<pre>
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<strong>Input:</strong> grid = [[1,1,1],[1,0,1],[1,1,1]]
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