add leetcode problem-cn part3

算法题（国内版）/problem (English)/最大人工岛(English) [making-a-large-island].html

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+<p>You are given an <code>n x n</code> binary matrix <code>grid</code>. You are allowed to change <strong>at most one</strong> <code>0</code> to be <code>1</code>.</p>
+
+
+
+<p>Return <em>the size of the largest <strong>island</strong> in</em> <code>grid</code> <em>after applying this operation</em>.</p>
+
+
+
+<p>An <strong>island</strong> is a 4-directionally connected group of <code>1</code>s.</p>
+
+
+
+<p>&nbsp;</p>
+
+<p><strong>Example 1:</strong></p>
+
+
+
+<pre>
+
+<strong>Input:</strong> grid = [[1,0],[0,1]]
+
+<strong>Output:</strong> 3
+
+<strong>Explanation:</strong> Change one 0 to 1 and connect two 1s, then we get an island with area = 3.
+
+</pre>
+
+
+
+<p><strong>Example 2:</strong></p>
+
+
+
+<pre>
+
+<strong>Input:</strong> grid = [[1,1],[1,0]]
+
+<strong>Output:</strong> 4