leetcode661

vector<vector<int>> imageSmoother(vector<vector<int>>& M) {
    const int N = ;
    vector<vector<int>> V;
    for (int i = ; i < M.size(); i++)//x范围M.size()=3
    {
        vector<int> m1 = M[i];
        vector<int> m2;
        for (int j = ; j < m1.size(); j++)//y范围m1.size()=3
        {
            int m0 = m1[j];
            //根据i和j找到周边8个节点
            int sum = ;
            int count = ;
            for (int x = i - ; x <= i + ; x++)
            {
                for (int y = j - ; y <= j + ; y++)
                {
                    if (x >=  && x <= M.size() -  && y >=  && y <= m1.size() - )
                    {
                        sum += M[x][y];
                        count++;
                    }
                }
            }
            int m = sum / count;
            m2.push_back(m);
        }
        V.push_back(m2);
    }
    return V;
}