LeetCode/Array/maxAreaOfIsland.java at master · konantian/LeetCode · GitHub

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public class maxAreaOfIsland{
	public static void main(String[] args){
		int grid[][]={{1,1,0,0,0},{1,1,0,0,0},{0,0,0,1,1},{0,0,0,1,1}};
		int area=max_areaofisland(grid);
		System.out.println(area);
	}

	public static int max_areaofisland(int[][] grid) {
        int max_area = 0;
        for(int i = 0; i < grid.length; i++)
            for(int j = 0; j < grid[0].length; j++)
                if(grid[i][j] == 1)max_area = Math.max(max_area, AreaOfIsland(grid, i, j));
        return max_area;
    }

    public static int AreaOfIsland(int[][] grid, int i, int j){
        if( i >= 0 && i < grid.length && j >= 0 && j < grid[0].length && grid[i][j] == 1){
            grid[i][j] = 0;
            return 1 + AreaOfIsland(grid, i+1, j) + AreaOfIsland(grid, i-1, j) + AreaOfIsland(grid, i, j-1) + AreaOfIsland(grid, i, j+1);
        }
        return 0;
    }
}