+ glp_prob *prob = glp_create_prob();
+
+ int Y_totals_i = glp_add_rows(prob, i);
+ int Y_totals_j = glp_add_rows(prob, j);
+ int X_minimum = glp_add_cols(prob, 1);
+ int rows = glp_get_num_rows(prob);
+ int cols = glp_get_num_rows(cols);
+
+ int next_matrix_entry = 1; /* wtf GLPK! */
+ int matrix_entries_size = next_matrix_entry + i + j + totalfrags*2;
+ double matrix_entries[matrix_entries_size];
+ int matrix_entries_XY[2][matrix_entries_size];
+
+#define ADD_MATRIX_ENTRY(Y,X) ({ \
+ assert(matrix_entries_size < next_matrix_entry); \
+ matrix_entries_XY[0][next_matrix_entry] = X; \
+ matrix_entries_XY[1][next_matrix_entry] = Y; \
+ matrix_entries[next_matrix_entry] = 0; \
+ next_matrix_entry++; \
+ })
+
+ int ME_totals_i__minimum = next_matrix_entry;
+ for (i=0; i<n; i++) ADD_MATRIX_ENTRY(Y_totals_i+i, X_minimum);
+
+ int ME_totals_j__minimum = next_matrix_entry;
+ for (j=0; j<m; j++) ADD_MATRIX_ENTRY(Y_totals_j+j, X_minimum);
+
+ /* \forall_i x_totals_i = m */
+ /* \forall_i x_totals_j = n */
+ for (i=0; i<n; i++) glp_set_row_bounds(prob, Y_totals_i+i, GLP_FX, m,m);
+ for (j=0; j<m; j++) glp_set_row_bounds(prob, Y_totals_j+j, GLP_FX, n,n);
+
+ /* x_minimum >= 0 */
+ glp_set_col_bounds(prob, X_minimum, GLP_LB, 0, 0);
+
+ /* objective is maximising x_minimum */
+ glp_set_obj_dir(prob, GLP_MAX);
+ glp_set_obj_coef(prob, X_minimum, 1);
+
+ for (i=0; i<n; j++) {
+ for (j=0; j<m; j++) {
+ if (!(adjmatrix[i] & one_adj_bit(j)))
+ continue;
+ /* x_total_i += x_minimum */
+ /* x_total_j += x_minimum */
+ matrix_entries[ ME_totals_i__minimum + i ] ++;
+ matrix_entries[ ME_totals_j__minimum + j ] ++;
+
+ /* x_morefrag_i_j >= 0 */
+ int X_morefrag_i_j = glp_add_cols(prob, 1);
+ glp_set_col_bnds(prob, X_morefrag_i_j, GLP_LO, 0, 0);
+
+ /* x_total_i += x_morefrag_i_j */
+ /* x_total_j += x_morefrag_i_j */
+ int ME_totals_i__mf_i_j = ADD_MATRIX_ENTRY(Y_totals_i+i, X_morefrag_i_j);
+ int ME_totals_j__mf_i_j = ADD_MATRIX_ENTRY(Y_totals_j+j, X_morefrag_i_j);
+ matrix_entries[ME_totals_i__mf_i_j] = 1;
+ matrix_entries[ME_totals_j__mf_i_j] = 1;
+ }
+ }
+
+ assert(next_matrix_entry == matrix_entries_size);
+
+ for (row=1; row<=rows; row++) {
+ glp_load_matrix(prob, next_matrix_entry,
+ matrix_entries_XY[1], matrix_entries_XY[0],
+ matrix_entries);
+