void pbqp_matrix_sub_col_value(pbqp_matrix *matrix, unsigned col_index,
vector *flags, num value);
void pbqp_matrix_sub_row_value(pbqp_matrix *matrix, unsigned row_index,
void pbqp_matrix_sub_col_value(pbqp_matrix *matrix, unsigned col_index,
vector *flags, num value);
void pbqp_matrix_sub_row_value(pbqp_matrix *matrix, unsigned row_index,