construct_submatrix.rb

def constructSubmatrix(matrix, rowsToDelete, columnsToDelete)
    x = 0

    while (x < rowsToDelete.length)
          matrix.delete_at(rowsToDelete[x])

          y = x + 1

          while (y < rowsToDelete.length)
                rowsToDelete[y] = rowsToDelete[y] - 1
                y = y + 1
          end

          x = x + 1
    end

    x = 0
    y = 0

    while (x < matrix.length)
          temp_column = Array.new
          temp_column = columnsToDelete.clone

          while (y < temp_column.length)
                matrix[x].delete_at(temp_column[y])

                z = y + 1

                while (z < temp_column.length)
                      temp_column[z] = temp_column[z] - 1
                      z = z + 1
                end

                y = y + 1
          end

          x = x + 1
          y = 0
    end

    return matrix
end