class Solution {

public:

    vector<vector<int>> imageSmoother(vector<vector<int>>& M) {

        if(M.empty() || M[].empty()) return {};

        vector<vector<int>> res = M, dirs = {{-, -}, {-, }, {-, }, {, -},

                                             {, }, {, -}, {, }, {, } };//dirs err.

        int m = M.size(), n = M[].size();

        for(int i=; i<m; i++)

        {

            for(int j=; j<n; j++)

            {

                int sum = M[i][j], num = ;//err.

                for(auto dir : dirs)

                {

                    int x = i+dir[], y = j+dir[];

                    if(x< || x>=m || y< || y>=n) continue;//err.

                    num++;

                    sum += M[x][y];

                }

                res[i][j] = sum / num;

            }

        }

        return res;

    }

};