#827
Making A Large Island
expert · 1260 · lc hard +32 · verified · 56.3% accepted · 5,014 likes · top 50%
Description
You are given an n x n binary matrix grid. You may change at most one 0 cell to 1.
Return the size of the largest island in grid after applying this operation.
An island is a group of 1-cells connected in four directions.
Example 1:
Input: grid = [[1,0],[0,1]]
Output: 3
Explanation: Change one 0 to 1 and connect two 1s, then we get an island with area = 3.
Example 2:
Input: grid = [[1,1],[1,0]]
Output: 4
Explanation: Change the 0 to 1 and make the island bigger, only one island with area = 4.
Example 3:
Input: grid = [[1,1],[1,1]]
Output: 4
Explanation: Can't change any 0 to 1, only one island with area = 4.
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