Python solution, easy to understand, beating over 95%

  • 1

    Since the result would be number of islands×2+2 if there is no 2×2 islands and every 2×2 islands would reduce the result by 2, we can calculate the number of islands and the number of 2×2 islands to get the result.

        for i in range(0,len(grid)):
            for j in range(0,len(grid[i])):
                if grid[i][j]==1:
                    if i>0 and j>0:
                        if grid[i-1][j]==1 and grid[i][j-1]==1 and grid[i-1][j-1]==1:
        return num+2

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