/* glpk.h (GLPK API) */

/***********************************************************************
*  This code is part of GLPK (GNU Linear Programming Kit).
*
*  Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
*  2009, 2010, 2011, 2013, 2014, 2015, 2016, 2017 Andrew Makhorin,
*  Department for Applied Informatics, Moscow Aviation Institute,
*  Moscow, Russia. All rights reserved. E-mail: <mao@gnu.org>.
*
*  GLPK is free software: you can redistribute it and/or modify it
*  under the terms of the GNU General Public License as published by
*  the Free Software Foundation, either version 3 of the License, or
*  (at your option) any later version.
*
*  GLPK is distributed in the hope that it will be useful, but WITHOUT
*  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
*  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
*  License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with GLPK. If not, see <http://www.gnu.org/licenses/>.
***********************************************************************/

#ifndef GLPK_H
#define GLPK_H

#include <stdarg.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

/* library version numbers: */
#define GLP_MAJOR_VERSION  4
#define GLP_MINOR_VERSION  63

typedef struct glp_prob glp_prob;
/* LP/MIP problem object */

/* optimization direction flag: */
#define GLP_MIN            1  /* minimization */
#define GLP_MAX            2  /* maximization */

/* kind of structural variable: */
#define GLP_CV             1  /* continuous variable */
#define GLP_IV             2  /* integer variable */
#define GLP_BV             3  /* binary variable */

/* type of auxiliary/structural variable: */
#define GLP_FR             1  /* free (unbounded) variable */
#define GLP_LO             2  /* variable with lower bound */
#define GLP_UP             3  /* variable with upper bound */
#define GLP_DB             4  /* double-bounded variable */
#define GLP_FX             5  /* fixed variable */

/* status of auxiliary/structural variable: */
#define GLP_BS             1  /* basic variable */
#define GLP_NL             2  /* non-basic variable on lower bound */
#define GLP_NU             3  /* non-basic variable on upper bound */
#define GLP_NF             4  /* non-basic free (unbounded) variable */
#define GLP_NS             5  /* non-basic fixed variable */

/* scaling options: */
#define GLP_SF_GM       0x01  /* perform geometric mean scaling */
#define GLP_SF_EQ       0x10  /* perform equilibration scaling */
#define GLP_SF_2N       0x20  /* round scale factors to power of two */
#define GLP_SF_SKIP     0x40  /* skip if problem is well scaled */
#define GLP_SF_AUTO     0x80  /* choose scaling options automatically */

/* solution indicator: */
#define GLP_SOL            1  /* basic solution */
#define GLP_IPT            2  /* interior-point solution */
#define GLP_MIP            3  /* mixed integer solution */

/* solution status: */
#define GLP_UNDEF          1  /* solution is undefined */
#define GLP_FEAS           2  /* solution is feasible */
#define GLP_INFEAS         3  /* solution is infeasible */
#define GLP_NOFEAS         4  /* no feasible solution exists */
#define GLP_OPT            5  /* solution is optimal */
#define GLP_UNBND          6  /* solution is unbounded */

typedef struct
{     /* basis factorization control parameters */
      int msg_lev;            /* (not used) */
      int type;               /* factorization type: */
#if 1 /* 05/III-2014 */
#define GLP_BF_LUF      0x00  /* plain LU-factorization */
#define GLP_BF_BTF      0x10  /* block triangular LU-factorization */
#endif
#define GLP_BF_FT       0x01  /* Forrest-Tomlin (LUF only) */
#define GLP_BF_BG       0x02  /* Schur compl. + Bartels-Golub */
#define GLP_BF_GR       0x03  /* Schur compl. + Givens rotation */
      int lu_size;            /* (not used) */
      double piv_tol;         /* sgf_piv_tol */
      int piv_lim;            /* sgf_piv_lim */
      int suhl;               /* sgf_suhl */
      double eps_tol;         /* sgf_eps_tol */
      double max_gro;         /* (not used) */
      int nfs_max;            /* fhvint.nfs_max */
      double upd_tol;         /* (not used) */
      int nrs_max;            /* scfint.nn_max */
      int rs_size;            /* (not used) */
      double foo_bar[38];     /* (reserved) */
} glp_bfcp;

typedef struct
{     /* simplex method control parameters */
      int msg_lev;            /* message level: */
#define GLP_MSG_OFF        0  /* no output */
#define GLP_MSG_ERR        1  /* warning and error messages only */
#define GLP_MSG_ON         2  /* normal output */
#define GLP_MSG_ALL        3  /* full output */
#define GLP_MSG_DBG        4  /* debug output */
      int meth;               /* simplex method option: */
#define GLP_PRIMAL         1  /* use primal simplex */
#define GLP_DUALP          2  /* use dual; if it fails, use primal */
#define GLP_DUAL           3  /* use dual simplex */
      int pricing;            /* pricing technique: */
#define GLP_PT_STD      0x11  /* standard (Dantzig's rule) */
#define GLP_PT_PSE      0x22  /* projected steepest edge */
      int r_test;             /* ratio test technique: */
#define GLP_RT_STD      0x11  /* standard (textbook) */
#define GLP_RT_HAR      0x22  /* Harris' two-pass ratio test */
#if 1 /* 16/III-2016 */
#define GLP_RT_FLIP     0x33  /* long-step (flip-flop) ratio test */
#endif
      double tol_bnd;         /* primal feasibility tolerance */
      double tol_dj;          /* dual feasibility tolerance */
      double tol_piv;         /* pivot tolerance */
      double obj_ll;          /* lower objective limit */
      double obj_ul;          /* upper objective limit */
      int it_lim;             /* simplex iteration limit */
      int tm_lim;             /* time limit, ms */
      int out_frq;            /* display output frequency, ms */
      int out_dly;            /* display output delay, ms */
      int presolve;           /* enable/disable using LP presolver */
#if 1 /* 11/VII-2017 (not documented yet) */
      int excl;               /* exclude fixed non-basic variables */
      int shift;              /* shift bounds of variables to zero */
      int aorn;               /* option to use A or N: */
#define GLP_USE_AT         1  /* use A matrix in row-wise format */
#define GLP_USE_NT         2  /* use N matrix in row-wise format */
      double foo_bar[33];     /* (reserved) */
#endif
} glp_smcp;

typedef struct
{     /* interior-point solver control parameters */
      int msg_lev;            /* message level (see glp_smcp) */
      int ord_alg;            /* ordering algorithm: */
#define GLP_ORD_NONE       0  /* natural (original) ordering */
#define GLP_ORD_QMD        1  /* quotient minimum degree (QMD) */
#define GLP_ORD_AMD        2  /* approx. minimum degree (AMD) */
#define GLP_ORD_SYMAMD     3  /* approx. minimum degree (SYMAMD) */
      double foo_bar[48];     /* (reserved) */
} glp_iptcp;

typedef struct glp_tree glp_tree;
/* branch-and-bound tree */

typedef struct
{     /* integer optimizer control parameters */
      int msg_lev;            /* message level (see glp_smcp) */
      int br_tech;            /* branching technique: */
#define GLP_BR_FFV         1  /* first fractional variable */
#define GLP_BR_LFV         2  /* last fractional variable */
#define GLP_BR_MFV         3  /* most fractional variable */
#define GLP_BR_DTH         4  /* heuristic by Driebeck and Tomlin */
#define GLP_BR_PCH         5  /* hybrid pseudocost heuristic */
      int bt_tech;            /* backtracking technique: */
#define GLP_BT_DFS         1  /* depth first search */
#define GLP_BT_BFS         2  /* breadth first search */
#define GLP_BT_BLB         3  /* best local bound */
#define GLP_BT_BPH         4  /* best projection heuristic */
      double tol_int;         /* mip.tol_int */
      double tol_obj;         /* mip.tol_obj */
      int tm_lim;             /* mip.tm_lim (milliseconds) */
      int out_frq;            /* mip.out_frq (milliseconds) */
      int out_dly;            /* mip.out_dly (milliseconds) */
      void (*cb_func)(glp_tree *T, void *info);
                              /* mip.cb_func */
      void *cb_info;          /* mip.cb_info */
      int cb_size;            /* mip.cb_size */
      int pp_tech;            /* preprocessing technique: */
#define GLP_PP_NONE        0  /* disable preprocessing */
#define GLP_PP_ROOT        1  /* preprocessing only on root level */
#define GLP_PP_ALL         2  /* preprocessing on all levels */
      double mip_gap;         /* relative MIP gap tolerance */
      int mir_cuts;           /* MIR cuts       (GLP_ON/GLP_OFF) */
      int gmi_cuts;           /* Gomory's cuts  (GLP_ON/GLP_OFF) */
      int cov_cuts;           /* cover cuts     (GLP_ON/GLP_OFF) */
      int clq_cuts;           /* clique cuts    (GLP_ON/GLP_OFF) */
      int presolve;           /* enable/disable using MIP presolver */
      int binarize;           /* try to binarize integer variables */
      int fp_heur;            /* feasibility pump heuristic */
      int ps_heur;            /* proximity search heuristic */
      int ps_tm_lim;          /* proxy time limit, milliseconds */
      int sr_heur;            /* simple rounding heuristic */
#if 1 /* 24/X-2015; not documented--should not be used */
      int use_sol;            /* use existing solution */
      const char *save_sol;   /* filename to save every new solution */
      int alien;              /* use alien solver */
#endif
#if 1 /* 16/III-2016; not documented--should not be used */
      int flip;               /* use long-step dual simplex */
#endif
      double foo_bar[23];     /* (reserved) */
} glp_iocp;

typedef struct
{     /* additional row attributes */
      int level;
      /* subproblem level at which the row was added */
      int origin;
      /* row origin flag: */
#define GLP_RF_REG         0  /* regular constraint */
#define GLP_RF_LAZY        1  /* "lazy" constraint */
#define GLP_RF_CUT         2  /* cutting plane constraint */
      int klass;
      /* row class descriptor: */
#define GLP_RF_GMI         1  /* Gomory's mixed integer cut */
#define GLP_RF_MIR         2  /* mixed integer rounding cut */
#define GLP_RF_COV         3  /* mixed cover cut */
#define GLP_RF_CLQ         4  /* clique cut */
      double foo_bar[7];
      /* (reserved) */
} glp_attr;

/* enable/disable flag: */
#define GLP_ON             1  /* enable something */
#define GLP_OFF            0  /* disable something */

/* reason codes: */
#define GLP_IROWGEN     0x01  /* request for row generation */
#define GLP_IBINGO      0x02  /* better integer solution found */
#define GLP_IHEUR       0x03  /* request for heuristic solution */
#define GLP_ICUTGEN     0x04  /* request for cut generation */
#define GLP_IBRANCH     0x05  /* request for branching */
#define GLP_ISELECT     0x06  /* request for subproblem selection */
#define GLP_IPREPRO     0x07  /* request for preprocessing */

/* branch selection indicator: */
#define GLP_NO_BRNCH       0  /* select no branch */
#define GLP_DN_BRNCH       1  /* select down-branch */
#define GLP_UP_BRNCH       2  /* select up-branch */

/* return codes: */
#define GLP_EBADB       0x01  /* invalid basis */
#define GLP_ESING       0x02  /* singular matrix */
#define GLP_ECOND       0x03  /* ill-conditioned matrix */
#define GLP_EBOUND      0x04  /* invalid bounds */
#define GLP_EFAIL       0x05  /* solver failed */
#define GLP_EOBJLL      0x06  /* objective lower limit reached */
#define GLP_EOBJUL      0x07  /* objective upper limit reached */
#define GLP_EITLIM      0x08  /* iteration limit exceeded */
#define GLP_ETMLIM      0x09  /* time limit exceeded */
#define GLP_ENOPFS      0x0A  /* no primal feasible solution */
#define GLP_ENODFS      0x0B  /* no dual feasible solution */
#define GLP_EROOT       0x0C  /* root LP optimum not provided */
#define GLP_ESTOP       0x0D  /* search terminated by application */
#define GLP_EMIPGAP     0x0E  /* relative mip gap tolerance reached */
#define GLP_ENOFEAS     0x0F  /* no primal/dual feasible solution */
#define GLP_ENOCVG      0x10  /* no convergence */
#define GLP_EINSTAB     0x11  /* numerical instability */
#define GLP_EDATA       0x12  /* invalid data */
#define GLP_ERANGE      0x13  /* result out of range */

/* condition indicator: */
#define GLP_KKT_PE         1  /* primal equalities */
#define GLP_KKT_PB         2  /* primal bounds */
#define GLP_KKT_DE         3  /* dual equalities */
#define GLP_KKT_DB         4  /* dual bounds */
#define GLP_KKT_CS         5  /* complementary slackness */

/* MPS file format: */
#define GLP_MPS_DECK       1  /* fixed (ancient) */
#define GLP_MPS_FILE       2  /* free (modern) */

typedef struct
{     /* MPS format control parameters */
      int blank;
      /* character code to replace blanks in symbolic names */
      char *obj_name;
      /* objective row name */
      double tol_mps;
      /* zero tolerance for MPS data */
      double foo_bar[17];
      /* (reserved for use in the future) */
} glp_mpscp;

typedef struct
{     /* CPLEX LP format control parameters */
      double foo_bar[20];
      /* (reserved for use in the future) */
} glp_cpxcp;

typedef struct glp_tran glp_tran;
/* MathProg translator workspace */

glp_prob *glp_create_prob(void);
/* create problem object */

void glp_set_prob_name(glp_prob *P, const char *name);
/* assign (change) problem name */

void glp_set_obj_name(glp_prob *P, const char *name);
/* assign (change) objective function name */

void glp_set_obj_dir(glp_prob *P, int dir);
/* set (change) optimization direction flag */

int glp_add_rows(glp_prob *P, int nrs);
/* add new rows to problem object */

int glp_add_cols(glp_prob *P, int ncs);
/* add new columns to problem object */

void glp_set_row_name(glp_prob *P, int i, const char *name);
/* assign (change) row name */

void glp_set_col_name(glp_prob *P, int j, const char *name);
/* assign (change) column name */

void glp_set_row_bnds(glp_prob *P, int i, int type, double lb,
      double ub);
/* set (change) row bounds */

void glp_set_col_bnds(glp_prob *P, int j, int type, double lb,
      double ub);
/* set (change) column bounds */

void glp_set_obj_coef(glp_prob *P, int j, double coef);
/* set (change) obj. coefficient or constant term */

void glp_set_mat_row(glp_prob *P, int i, int len, const int ind[],
      const double val[]);
/* set (replace) row of the constraint matrix */

void glp_set_mat_col(glp_prob *P, int j, int len, const int ind[],
      const double val[]);
/* set (replace) column of the constraint matrix */

void glp_load_matrix(glp_prob *P, int ne, const int ia[],
      const int ja[], const double ar[]);
/* load (replace) the whole constraint matrix */

int glp_check_dup(int m, int n, int ne, const int ia[], const int ja[]);
/* check for duplicate elements in sparse matrix */

void glp_sort_matrix(glp_prob *P);
/* sort elements of the constraint matrix */

void glp_del_rows(glp_prob *P, int nrs, const int num[]);
/* delete specified rows from problem object */

void glp_del_cols(glp_prob *P, int ncs, const int num[]);
/* delete specified columns from problem object */

void glp_copy_prob(glp_prob *dest, glp_prob *prob, int names);
/* copy problem object content */

void glp_erase_prob(glp_prob *P);
/* erase problem object content */

void glp_delete_prob(glp_prob *P);
/* delete problem object */

const char *glp_get_prob_name(glp_prob *P);
/* retrieve problem name */

const char *glp_get_obj_name(glp_prob *P);
/* retrieve objective function name */

int glp_get_obj_dir(glp_prob *P);
/* retrieve optimization direction flag */

int glp_get_num_rows(glp_prob *P);
/* retrieve number of rows */

int glp_get_num_cols(glp_prob *P);
/* retrieve number of columns */

const char *glp_get_row_name(glp_prob *P, int i);
/* retrieve row name */

const char *glp_get_col_name(glp_prob *P, int j);
/* retrieve column name */

int glp_get_row_type(glp_prob *P, int i);
/* retrieve row type */

double glp_get_row_lb(glp_prob *P, int i);
/* retrieve row lower bound */

double glp_get_row_ub(glp_prob *P, int i);
/* retrieve row upper bound */

int glp_get_col_type(glp_prob *P, int j);
/* retrieve column type */

double glp_get_col_lb(glp_prob *P, int j);
/* retrieve column lower bound */

double glp_get_col_ub(glp_prob *P, int j);
/* retrieve column upper bound */

double glp_get_obj_coef(glp_prob *P, int j);
/* retrieve obj. coefficient or constant term */

int glp_get_num_nz(glp_prob *P);
/* retrieve number of constraint coefficients */

int glp_get_mat_row(glp_prob *P, int i, int ind[], double val[]);
/* retrieve row of the constraint matrix */

int glp_get_mat_col(glp_prob *P, int j, int ind[], double val[]);
/* retrieve column of the constraint matrix */

void glp_create_index(glp_prob *P);
/* create the name index */

int glp_find_row(glp_prob *P, const char *name);
/* find row by its name */

int glp_find_col(glp_prob *P, const char *name);
/* find column by its name */

void glp_delete_index(glp_prob *P);
/* delete the name index */

void glp_set_rii(glp_prob *P, int i, double rii);
/* set (change) row scale factor */

void glp_set_sjj(glp_prob *P, int j, double sjj);
/* set (change) column scale factor */

double glp_get_rii(glp_prob *P, int i);
/* retrieve row scale factor */

double glp_get_sjj(glp_prob *P, int j);
/* retrieve column scale factor */

void glp_scale_prob(glp_prob *P, int flags);
/* scale problem data */

void glp_unscale_prob(glp_prob *P);
/* unscale problem data */

void glp_set_row_stat(glp_prob *P, int i, int stat);
/* set (change) row status */

void glp_set_col_stat(glp_prob *P, int j, int stat);
/* set (change) column status */

void glp_std_basis(glp_prob *P);
/* construct standard initial LP basis */

void glp_adv_basis(glp_prob *P, int flags);
/* construct advanced initial LP basis */

void glp_cpx_basis(glp_prob *P);
/* construct Bixby's initial LP basis */

int glp_simplex(glp_prob *P, const glp_smcp *parm);
/* solve LP problem with the simplex method */

int glp_exact(glp_prob *P, const glp_smcp *parm);
/* solve LP problem in exact arithmetic */

void glp_init_smcp(glp_smcp *parm);
/* initialize simplex method control parameters */

int glp_get_status(glp_prob *P);
/* retrieve generic status of basic solution */

int glp_get_prim_stat(glp_prob *P);
/* retrieve status of primal basic solution */

int glp_get_dual_stat(glp_prob *P);
/* retrieve status of dual basic solution */

double glp_get_obj_val(glp_prob *P);
/* retrieve objective value (basic solution) */

int glp_get_row_stat(glp_prob *P, int i);
/* retrieve row status */

double glp_get_row_prim(glp_prob *P, int i);
/* retrieve row primal value (basic solution) */

double glp_get_row_dual(glp_prob *P, int i);
/* retrieve row dual value (basic solution) */

int glp_get_col_stat(glp_prob *P, int j);
/* retrieve column status */

double glp_get_col_prim(glp_prob *P, int j);
/* retrieve column primal value (basic solution) */

double glp_get_col_dual(glp_prob *P, int j);
/* retrieve column dual value (basic solution) */

int glp_get_unbnd_ray(glp_prob *P);
/* determine variable causing unboundedness */

#if 1 /* 08/VIII-2013; not documented yet */
int glp_get_it_cnt(glp_prob *P);
/* get simplex solver iteration count */
#endif

#if 1 /* 08/VIII-2013; not documented yet */
void glp_set_it_cnt(glp_prob *P, int it_cnt);
/* set simplex solver iteration count */
#endif

int glp_interior(glp_prob *P, const glp_iptcp *parm);
/* solve LP problem with the interior-point method */

void glp_init_iptcp(glp_iptcp *parm);
/* initialize interior-point solver control parameters */

int glp_ipt_status(glp_prob *P);
/* retrieve status of interior-point solution */

double glp_ipt_obj_val(glp_prob *P);
/* retrieve objective value (interior point) */

double glp_ipt_row_prim(glp_prob *P, int i);
/* retrieve row primal value (interior point) */

double glp_ipt_row_dual(glp_prob *P, int i);
/* retrieve row dual value (interior point) */

double glp_ipt_col_prim(glp_prob *P, int j);
/* retrieve column primal value (interior point) */

double glp_ipt_col_dual(glp_prob *P, int j);
/* retrieve column dual value (interior point) */

void glp_set_col_kind(glp_prob *P, int j, int kind);
/* set (change) column kind */

int glp_get_col_kind(glp_prob *P, int j);
/* retrieve column kind */

int glp_get_num_int(glp_prob *P);
/* retrieve number of integer columns */

int glp_get_num_bin(glp_prob *P);
/* retrieve number of binary columns */

int glp_intopt(glp_prob *P, const glp_iocp *parm);
/* solve MIP problem with the branch-and-bound method */

void glp_init_iocp(glp_iocp *parm);
/* initialize integer optimizer control parameters */

int glp_mip_status(glp_prob *P);
/* retrieve status of MIP solution */

double glp_mip_obj_val(glp_prob *P);
/* retrieve objective value (MIP solution) */

double glp_mip_row_val(glp_prob *P, int i);
/* retrieve row value (MIP solution) */

double glp_mip_col_val(glp_prob *P, int j);
/* retrieve column value (MIP solution) */

void glp_check_kkt(glp_prob *P, int sol, int cond, double *ae_max,
      int *ae_ind, double *re_max, int *re_ind);
/* check feasibility/optimality conditions */

int glp_print_sol(glp_prob *P, const char *fname);
/* write basic solution in printable format */

int glp_read_sol(glp_prob *P, const char *fname);
/* read basic solution from text file */

int glp_write_sol(glp_prob *P, const char *fname);
/* write basic solution to text file */

int glp_print_ranges(glp_prob *P, int len, const int list[],
      int flags, const char *fname);
/* print sensitivity analysis report */

int glp_print_ipt(glp_prob *P, const char *fname);
/* write interior-point solution in printable format */

int glp_read_ipt(glp_prob *P, const char *fname);
/* read interior-point solution from text file */

int glp_write_ipt(glp_prob *P, const char *fname);
/* write interior-point solution to text file */

int glp_print_mip(glp_prob *P, const char *fname);
/* write MIP solution in printable format */

int glp_read_mip(glp_prob *P, const char *fname);
/* read MIP solution from text file */

int glp_write_mip(glp_prob *P, const char *fname);
/* write MIP solution to text file */

int glp_bf_exists(glp_prob *P);
/* check if LP basis factorization exists */

int glp_factorize(glp_prob *P);
/* compute LP basis factorization */

int glp_bf_updated(glp_prob *P);
/* check if LP basis factorization has been updated */

void glp_get_bfcp(glp_prob *P, glp_bfcp *parm);
/* retrieve LP basis factorization control parameters */

void glp_set_bfcp(glp_prob *P, const glp_bfcp *parm);
/* change LP basis factorization control parameters */

int glp_get_bhead(glp_prob *P, int k);
/* retrieve LP basis header information */

int glp_get_row_bind(glp_prob *P, int i);
/* retrieve row index in the basis header */

int glp_get_col_bind(glp_prob *P, int j);
/* retrieve column index in the basis header */

void glp_ftran(glp_prob *P, double x[]);
/* perform forward transformation (solve system B*x = b) */

void glp_btran(glp_prob *P, double x[]);
/* perform backward transformation (solve system B'*x = b) */

int glp_warm_up(glp_prob *P);
/* "warm up" LP basis */

int glp_eval_tab_row(glp_prob *P, int k, int ind[], double val[]);
/* compute row of the simplex tableau */

int glp_eval_tab_col(glp_prob *P, int k, int ind[], double val[]);
/* compute column of the simplex tableau */

int glp_transform_row(glp_prob *P, int len, int ind[], double val[]);
/* transform explicitly specified row */

int glp_transform_col(glp_prob *P, int len, int ind[], double val[]);
/* transform explicitly specified column */

int glp_prim_rtest(glp_prob *P, int len, const int ind[],
      const double val[], int dir, double eps);
/* perform primal ratio test */

int glp_dual_rtest(glp_prob *P, int len, const int ind[],
      const double val[], int dir, double eps);
/* perform dual ratio test */

void glp_analyze_bound(glp_prob *P, int k, double *value1, int *var1,
      double *value2, int *var2);
/* analyze active bound of non-basic variable */

void glp_analyze_coef(glp_prob *P, int k, double *coef1, int *var1,
      double *value1, double *coef2, int *var2, double *value2);
/* analyze objective coefficient at basic variable */

int glp_ios_reason(glp_tree *T);
/* determine reason for calling the callback routine */

glp_prob *glp_ios_get_prob(glp_tree *T);
/* access the problem object */

void glp_ios_tree_size(glp_tree *T, int *a_cnt, int *n_cnt,
      int *t_cnt);
/* determine size of the branch-and-bound tree */

int glp_ios_curr_node(glp_tree *T);
/* determine current active subproblem */

int glp_ios_next_node(glp_tree *T, int p);
/* determine next active subproblem */

int glp_ios_prev_node(glp_tree *T, int p);
/* determine previous active subproblem */

int glp_ios_up_node(glp_tree *T, int p);
/* determine parent subproblem */

int glp_ios_node_level(glp_tree *T, int p);
/* determine subproblem level */

double glp_ios_node_bound(glp_tree *T, int p);
/* determine subproblem local bound */

int glp_ios_best_node(glp_tree *T);
/* find active subproblem with best local bound */

double glp_ios_mip_gap(glp_tree *T);
/* compute relative MIP gap */

void *glp_ios_node_data(glp_tree *T, int p);
/* access subproblem application-specific data */

void glp_ios_row_attr(glp_tree *T, int i, glp_attr *attr);
/* retrieve additional row attributes */

int glp_ios_pool_size(glp_tree *T);
/* determine current size of the cut pool */

int glp_ios_add_row(glp_tree *T,
      const char *name, int klass, int flags, int len, const int ind[],
      const double val[], int type, double rhs);
/* add row (constraint) to the cut pool */

void glp_ios_del_row(glp_tree *T, int i);
/* remove row (constraint) from the cut pool */

void glp_ios_clear_pool(glp_tree *T);
/* remove all rows (constraints) from the cut pool */

int glp_ios_can_branch(glp_tree *T, int j);
/* check if can branch upon specified variable */

void glp_ios_branch_upon(glp_tree *T, int j, int sel);
/* choose variable to branch upon */

void glp_ios_select_node(glp_tree *T, int p);
/* select subproblem to continue the search */

int glp_ios_heur_sol(glp_tree *T, const double x[]);
/* provide solution found by heuristic */

void glp_ios_terminate(glp_tree *T);
/* terminate the solution process */

#ifdef GLP_UNDOC
int glp_gmi_cut(glp_prob *P, int j, int ind[], double val[], double
      phi[]);
/* generate Gomory's mixed integer cut (core routine) */
#endif

#ifdef GLP_UNDOC
int glp_gmi_gen(glp_prob *P, glp_prob *pool, int max_cuts);
/* generate Gomory's mixed integer cuts */
#endif

#ifdef GLP_UNDOC
typedef struct glp_mir glp_mir;
/* MIR cut generator workspace */
#endif

#ifdef GLP_UNDOC
glp_mir *glp_mir_init(glp_prob *P);
/* create and initialize MIR cut generator */
#endif

#ifdef GLP_UNDOC
int glp_mir_gen(glp_prob *P, glp_mir *mir, glp_prob *pool);
/* generate mixed integer rounding (MIR) cuts */
#endif

#ifdef GLP_UNDOC
void glp_mir_free(glp_mir *mir);
/* delete MIR cut generator workspace */
#endif

#ifdef GLP_UNDOC
typedef struct glp_cfg glp_cfg;
/* conflict graph descriptor */
#endif

#ifdef GLP_UNDOC
glp_cfg *glp_cfg_init(glp_prob *P);
/* create and initialize conflict graph */
#endif

#ifdef GLP_UNDOC
void glp_cfg_free(glp_cfg *G);
/* delete conflict graph descriptor */
#endif

#ifdef GLP_UNDOC
int glp_clq_cut(glp_prob *P, glp_cfg *G, int ind[], double val[]);
/* generate clique cut from conflict graph */
#endif

void glp_init_mpscp(glp_mpscp *parm);
/* initialize MPS format control parameters */

int glp_read_mps(glp_prob *P, int fmt, const glp_mpscp *parm,
      const char *fname);
/* read problem data in MPS format */

int glp_write_mps(glp_prob *P, int fmt, const glp_mpscp *parm,
      const char *fname);
/* write problem data in MPS format */

void glp_init_cpxcp(glp_cpxcp *parm);
/* initialize CPLEX LP format control parameters */

int glp_read_lp(glp_prob *P, const glp_cpxcp *parm, const char *fname);
/* read problem data in CPLEX LP format */

int glp_write_lp(glp_prob *P, const glp_cpxcp *parm, const char *fname);
/* write problem data in CPLEX LP format */

int glp_read_prob(glp_prob *P, int flags, const char *fname);
/* read problem data in GLPK format */

int glp_write_prob(glp_prob *P, int flags, const char *fname);
/* write problem data in GLPK format */

glp_tran *glp_mpl_alloc_wksp(void);
/* allocate the MathProg translator workspace */

void glp_mpl_init_rand(glp_tran *tran, int seed);
/* initialize pseudo-random number generator */

int glp_mpl_read_model(glp_tran *tran, const char *fname, int skip);
/* read and translate model section */

int glp_mpl_read_data(glp_tran *tran, const char *fname);
/* read and translate data section */

int glp_mpl_generate(glp_tran *tran, const char *fname);
/* generate the model */

void glp_mpl_build_prob(glp_tran *tran, glp_prob *prob);
/* build LP/MIP problem instance from the model */

int glp_mpl_postsolve(glp_tran *tran, glp_prob *prob, int sol);
/* postsolve the model */

void glp_mpl_free_wksp(glp_tran *tran);
/* free the MathProg translator workspace */

int glp_read_cnfsat(glp_prob *P, const char *fname);
/* read CNF-SAT problem data in DIMACS format */

int glp_check_cnfsat(glp_prob *P);
/* check for CNF-SAT problem instance */

int glp_write_cnfsat(glp_prob *P, const char *fname);
/* write CNF-SAT problem data in DIMACS format */

int glp_minisat1(glp_prob *P);
/* solve CNF-SAT problem with MiniSat solver */

int glp_intfeas1(glp_prob *P, int use_bound, int obj_bound);
/* solve integer feasibility problem */

int glp_init_env(void);
/* initialize GLPK environment */

const char *glp_version(void);
/* determine library version */

const char *glp_config(const char *option);
/* determine library configuration */

int glp_free_env(void);
/* free GLPK environment */

void glp_puts(const char *s);
/* write string on terminal */

void glp_printf(const char *fmt, ...);
/* write formatted output on terminal */

void glp_vprintf(const char *fmt, va_list arg);
/* write formatted output on terminal */

int glp_term_out(int flag);
/* enable/disable terminal output */

void glp_term_hook(int (*func)(void *info, const char *s), void *info);
/* install hook to intercept terminal output */

int glp_open_tee(const char *name);
/* start copying terminal output to text file */

int glp_close_tee(void);
/* stop copying terminal output to text file */

#ifndef GLP_ERRFUNC_DEFINED
#define GLP_ERRFUNC_DEFINED
typedef void (*glp_errfunc)(const char *fmt, ...);
#endif

#define glp_error glp_error_(__FILE__, __LINE__)
glp_errfunc glp_error_(const char *file, int line);
/* display fatal error message and terminate execution */

#if 1 /* 07/XI-2015 */
int glp_at_error(void);
/* check for error state */
#endif

#define glp_assert(expr) \
      ((void)((expr) || (glp_assert_(#expr, __FILE__, __LINE__), 1)))
void glp_assert_(const char *expr, const char *file, int line);
/* check for logical condition */

void glp_error_hook(void (*func)(void *info), void *info);
/* install hook to intercept abnormal termination */

#define glp_malloc(size) glp_alloc(1, size)
/* allocate memory block (obsolete) */

#define glp_calloc(n, size) glp_alloc(n, size)
/* allocate memory block (obsolete) */

void *glp_alloc(int n, int size);
/* allocate memory block */

void *glp_realloc(void *ptr, int n, int size);
/* reallocate memory block */

void glp_free(void *ptr);
/* free (deallocate) memory block */

void glp_mem_limit(int limit);
/* set memory usage limit */

void glp_mem_usage(int *count, int *cpeak, size_t *total,
      size_t *tpeak);
/* get memory usage information */

double glp_time(void);
/* determine current universal time */

double glp_difftime(double t1, double t0);
/* compute difference between two time values */

typedef struct glp_graph glp_graph;
typedef struct glp_vertex glp_vertex;
typedef struct glp_arc glp_arc;

struct glp_graph
{     /* graph descriptor */
      void *pool; /* DMP *pool; */
      /* memory pool to store graph components */
      char *name;
      /* graph name (1 to 255 chars); NULL means no name is assigned
         to the graph */
      int nv_max;
      /* length of the vertex list (enlarged automatically) */
      int nv;
      /* number of vertices in the graph, 0 <= nv <= nv_max */
      int na;
      /* number of arcs in the graph, na >= 0 */
      glp_vertex **v; /* glp_vertex *v[1+nv_max]; */
      /* v[i], 1 <= i <= nv, is a pointer to i-th vertex */
      void *index; /* AVL *index; */
      /* vertex index to find vertices by their names; NULL means the
         index does not exist */
      int v_size;
      /* size of data associated with each vertex (0 to 256 bytes) */
      int a_size;
      /* size of data associated with each arc (0 to 256 bytes) */
};

struct glp_vertex
{     /* vertex descriptor */
      int i;
      /* vertex ordinal number, 1 <= i <= nv */
      char *name;
      /* vertex name (1 to 255 chars); NULL means no name is assigned
         to the vertex */
      void *entry; /* AVLNODE *entry; */
      /* pointer to corresponding entry in the vertex index; NULL means
         that either the index does not exist or the vertex has no name
         assigned */
      void *data;
      /* pointer to data associated with the vertex */
      void *temp;
      /* working pointer */
      glp_arc *in;
      /* pointer to the (unordered) list of incoming arcs */
      glp_arc *out;
      /* pointer to the (unordered) list of outgoing arcs */
};

struct glp_arc
{     /* arc descriptor */
      glp_vertex *tail;
      /* pointer to the tail endpoint */
      glp_vertex *head;
      /* pointer to the head endpoint */
      void *data;
      /* pointer to data associated with the arc */
      void *temp;
      /* working pointer */
      glp_arc *t_prev;
      /* pointer to previous arc having the same tail endpoint */
      glp_arc *t_next;
      /* pointer to next arc having the same tail endpoint */
      glp_arc *h_prev;
      /* pointer to previous arc having the same head endpoint */
      glp_arc *h_next;
      /* pointer to next arc having the same head endpoint */
};

glp_graph *glp_create_graph(int v_size, int a_size);
/* create graph */

void glp_set_graph_name(glp_graph *G, const char *name);
/* assign (change) graph name */

int glp_add_vertices(glp_graph *G, int nadd);
/* add new vertices to graph */

void glp_set_vertex_name(glp_graph *G, int i, const char *name);
/* assign (change) vertex name */

glp_arc *glp_add_arc(glp_graph *G, int i, int j);
/* add new arc to graph */

void glp_del_vertices(glp_graph *G, int ndel, const int num[]);
/* delete vertices from graph */

void glp_del_arc(glp_graph *G, glp_arc *a);
/* delete arc from graph */

void glp_erase_graph(glp_graph *G, int v_size, int a_size);
/* erase graph content */

void glp_delete_graph(glp_graph *G);
/* delete graph */

void glp_create_v_index(glp_graph *G);
/* create vertex name index */

int glp_find_vertex(glp_graph *G, const char *name);
/* find vertex by its name */

void glp_delete_v_index(glp_graph *G);
/* delete vertex name index */

int glp_read_graph(glp_graph *G, const char *fname);
/* read graph from plain text file */

int glp_write_graph(glp_graph *G, const char *fname);
/* write graph to plain text file */

void glp_mincost_lp(glp_prob *P, glp_graph *G, int names, int v_rhs,
      int a_low, int a_cap, int a_cost);
/* convert minimum cost flow problem to LP */

int glp_mincost_okalg(glp_graph *G, int v_rhs, int a_low, int a_cap,
      int a_cost, double *sol, int a_x, int v_pi);
/* find minimum-cost flow with out-of-kilter algorithm */

int glp_mincost_relax4(glp_graph *G, int v_rhs, int a_low, int a_cap,
      int a_cost, int crash, double *sol, int a_x, int a_rc);
/* find minimum-cost flow with Bertsekas-Tseng relaxation method */

void glp_maxflow_lp(glp_prob *P, glp_graph *G, int names, int s,
      int t, int a_cap);
/* convert maximum flow problem to LP */

int glp_maxflow_ffalg(glp_graph *G, int s, int t, int a_cap,
      double *sol, int a_x, int v_cut);
/* find maximal flow with Ford-Fulkerson algorithm */

int glp_check_asnprob(glp_graph *G, int v_set);
/* check correctness of assignment problem data */

/* assignment problem formulation: */
#define GLP_ASN_MIN        1  /* perfect matching (minimization) */
#define GLP_ASN_MAX        2  /* perfect matching (maximization) */
#define GLP_ASN_MMP        3  /* maximum matching */

int glp_asnprob_lp(glp_prob *P, int form, glp_graph *G, int names,
      int v_set, int a_cost);
/* convert assignment problem to LP */

int glp_asnprob_okalg(int form, glp_graph *G, int v_set, int a_cost,
      double *sol, int a_x);
/* solve assignment problem with out-of-kilter algorithm */

int glp_asnprob_hall(glp_graph *G, int v_set, int a_x);
/* find bipartite matching of maximum cardinality */

double glp_cpp(glp_graph *G, int v_t, int v_es, int v_ls);
/* solve critical path problem */

int glp_read_mincost(glp_graph *G, int v_rhs, int a_low, int a_cap,
      int a_cost, const char *fname);
/* read min-cost flow problem data in DIMACS format */

int glp_write_mincost(glp_graph *G, int v_rhs, int a_low, int a_cap,
      int a_cost, const char *fname);
/* write min-cost flow problem data in DIMACS format */

int glp_read_maxflow(glp_graph *G, int *s, int *t, int a_cap,
      const char *fname);
/* read maximum flow problem data in DIMACS format */

int glp_write_maxflow(glp_graph *G, int s, int t, int a_cap,
      const char *fname);
/* write maximum flow problem data in DIMACS format */

int glp_read_asnprob(glp_graph *G, int v_set, int a_cost, const char
      *fname);
/* read assignment problem data in DIMACS format */

int glp_write_asnprob(glp_graph *G, int v_set, int a_cost, const char
      *fname);
/* write assignment problem data in DIMACS format */

int glp_read_ccdata(glp_graph *G, int v_wgt, const char *fname);
/* read graph in DIMACS clique/coloring format */

int glp_write_ccdata(glp_graph *G, int v_wgt, const char *fname);
/* write graph in DIMACS clique/coloring format */

int glp_netgen(glp_graph *G, int v_rhs, int a_cap, int a_cost,
      const int parm[1+15]);
/* Klingman's network problem generator */

void glp_netgen_prob(int nprob, int parm[1+15]);
/* Klingman's standard network problem instance */

int glp_gridgen(glp_graph *G, int v_rhs, int a_cap, int a_cost,
      const int parm[1+14]);
/* grid-like network problem generator */

int glp_rmfgen(glp_graph *G, int *s, int *t, int a_cap,
      const int parm[1+5]);
/* Goldfarb's maximum flow problem generator */

int glp_weak_comp(glp_graph *G, int v_num);
/* find all weakly connected components of graph */

int glp_strong_comp(glp_graph *G, int v_num);
/* find all strongly connected components of graph */

int glp_top_sort(glp_graph *G, int v_num);
/* topological sorting of acyclic digraph */

int glp_wclique_exact(glp_graph *G, int v_wgt, double *sol, int v_set);
/* find maximum weight clique with exact algorithm */

#ifdef __cplusplus
}
#endif

#endif

/* eof */
