vector<vector<int>> imageSmoother(vector<vector<int>>& M) {
if(r==1 && c==1) return M;
vector<vector<int>> res(M);
res[0][0]=(M[0][0]+M[0][1])/2;
res[0][c-1]=(M[0][c-1]+M[0][c-2])/2;
res[0][i] = (M[0][i] + M[0][i-1] +M[0][i+1] )/3;
res[0][0]=(M[0][0]+M[1][0])/2;
res[r-1][0]=(M[r-1][0]+M[r-2][0])/2;
res[i][0] = (M[i][0] + M[i-1][0] +M[i+1][0])/3;
res[i][j] =(M[i][j] +M[i-1][j]+ M[i][j-1] + M[i-1][j-1]+ M[i][j+1] + M[i+1][j] + M[i+1][j+1] + M[i-1][j+1] + M[i+1][j-1])/9;
res[0][i] = (M[0][i] + M[0][i-1] +M[0][i+1] +M[1][i] + M[1][i-1]+M[1][i+1])/6;
res[r-1][i] = (M[r-1][i] + M[r-1][i-1] +M[r-1][i+1] +M[r-2][i] + M[r-2][i-1]+M[r-2][i+1])/6;
res[i][0] = (M[i][0] + M[i-1][0] +M[i+1][0] +M[i][1] + M[i-1][1]+M[i+1][1])/6;
res[i][c-1] = (M[i][c-1] + M[i-1][c-1] +M[i+1][c-1] +M[i][c-2] + M[i-1][c-2]+M[i+1][c-2])/6;
res[0][0]=(M[0][0]+M[0][1] +M[1][1]+M[1][0])/4;
res[0][c-1]=(M[0][c-1]+M[0][c-2]+M[1][c-1]+M[1][c-2])/4;
res[r-1][0]=(M[r-1][0]+M[r-1][1]+M[r-2][0]+M[r-2][1])/4;
res[r-1][c-1]=(M[r-1][c-1]+M[r-2][c-1]+M[r-2][c-2]+M[r-1][c-2])/4;