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<p>An <strong>axis-aligned plus sign</strong> of <code>1</code>'s of order <code>k</code> has some center <code>grid[r][c] == 1</code> along with four arms of length <code>k - 1</code> going up, down, left, and right, and made of <code>1</code>'s. Note that there could be <code>0</code>'s or <code>1</code>'s beyond the arms of the plus sign, only the relevant area of the plus sign is checked for <code>1</code>'s.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<p><strong class="example">Example 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/06/13/plus1-grid.jpg" style="width: 404px; height: 405px;" />
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<pre>
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<strong>Input:</strong> n = 5, mines = [[4,2]]
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<strong>Explanation:</strong> In the above grid, the largest plus sign can only be of order 2. One of them is shown.
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</pre>
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<p><strong>Example 2:</strong></p>
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<p><strong class="example">Example 2:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/06/13/plus2-grid.jpg" style="width: 84px; height: 85px;" />
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<pre>
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<strong>Input:</strong> n = 1, mines = [[0,0]]
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