void setZeros(vector<vector<int>> &matrix)

      {

          int m = matrix.size();

          int n = matrix[].size();

          vector<bool>row(m, false);

          vector<bool>col(n, false);

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

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

          {

              if (matrix[i][j] == )

                  row[i] = col[j] = true;

          }

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

          {

              if (row[i] == true)

                  fill(&matrix[i][], &matrix[i][] + n, );

          }

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

          {

              if (col[j] == true)

              {

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

                      matrix[i][j] = ;

              }

          }