vector< vector <int> > matrix(n);

if (n<=0) return matrix;

for(int i=0; i<n; i++){

vector<int> v(m);

matrix[i] = v;

}

int row=n, col=m;

int r, c;

int cnt=1;

for (r=0, c=0; r<(row+1)/2 && c<(col+1)/2; r++, c++){

//top

for(int i=c; i<col-c; i++){

matrix[r][i] = cnt++;

}

//right

for(int i=r+1; i<row-r; i++){

matrix[i][col-c-1] = cnt++;

}

//bottom

for(int i=col-c-2; row-r-1>r && i>=c; i--){

matrix[row-r-1][i] = cnt++;

}

//left

for(int i=row-r-2; col-c-1>c && i>r; i--){

matrix[i][c] = cnt++;

}

}

return matrix;

{

cout << "[";

for(int j=0; j<v.size(); j++) {

printf(" %02d", v[j]);

}

cout << "]" << endl;;

{

for(int i=0; i<vv.size(); i++) {

printArray(vv[i]);

}

cout << endl;

{

int n=3, m=3;

if (argc>1){

m = n = atoi(argv[1]);

}

if (argc>2){

m = atoi(argv[2]);

}

vector< vector<int> > matrix = generateMatrix(n, m);

printMatrix(matrix);

return 0;