Max Area of Island | LeetCode

class Solution {
    public int maxAreaOfIsland(int[][] grid) {

        int m = grid.length;
        int n = grid[0].length;

        int maxArea = 0;

        for(int i=0; i<m; i++){
            for(int j=0; j<n; j++){
                if(grid[i][j]==1){
                    maxArea = Math.max(maxArea, dfs(grid, i, j));
                }
            }
        }

        return maxArea;
    }


    int dfs(int grid[][], int i, int j){
        if(i<0 || j<0 || i>=grid.length || j>=grid[0].length || grid[i][j]==0 || grid[i][j]==2)
            return 0;

        grid[i][j] = 2;

        return 1 + dfs(grid, i+1, j) + dfs(grid, i-1, j) + dfs(grid, i, j+1) + dfs(grid, i, j-1);
    }
}

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