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<p>给你一个大小为 <code>n x n</code> 二进制矩阵 <code>grid</code><strong>最多</strong> 只能将一格&nbsp;<code>0</code> 变成&nbsp;<code>1</code></p>
<p>返回执行此操作后,<code>grid</code> 中最大的岛屿面积是多少?</p>
<p><strong>岛屿</strong> 由一组上、下、左、右四个方向相连的&nbsp;<code>1</code> 形成。</p>
<p>&nbsp;</p>
<p><strong class="example">示例 1:</strong></p>
<pre>
<strong>输入: </strong>grid = [[1, 0], [0, 1]]
<strong>输出:</strong> 3
<strong>解释:</strong> 将一格0变成1最终连通两个小岛得到面积为 3 的岛屿。
</pre>
<p><strong class="example">示例 2:</strong></p>
<pre>
<strong>输入: </strong>grid =<strong> </strong>[[1, 1], [1, 0]]
<strong>输出:</strong> 4
<strong>解释:</strong> 将一格0变成1岛屿的面积扩大为 4。</pre>
<p><strong class="example">示例 3:</strong></p>
<pre>
<strong>输入: </strong>grid = [[1, 1], [1, 1]]
<strong>输出:</strong> 4
<strong>解释:</strong> 没有0可以让我们变成1面积依然为 4。</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>n == grid.length</code></li>
<li><code>n == grid[i].length</code></li>
<li><code>1 &lt;= n &lt;= 500</code></li>
<li><code>grid[i][j]</code><code>0</code><code>1</code></li>
</ul>