/* glpapi19.c (stand-alone LP/MIP solver) */

 /***********************************************************************

 *  This code is part of GLPK (GNU Linear Programming Kit).

 *

 *  Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,

 *  2009, 2010 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/>.

 ***********************************************************************/

 #include "glpapi.h"

 #include "glpgmp.h"

 struct csa

 {     /* common storage area */

       glp_prob *prob;

       /* LP/MIP problem object */

       glp_bfcp bfcp;

       /* basis factorization control parameters */

       glp_smcp smcp;

       /* simplex method control parameters */

       glp_iptcp iptcp;

       /* interior-point method control parameters */

       glp_iocp iocp;

       /* integer optimizer control parameters */

       glp_tran *tran;

       /* model translator workspace */

       glp_graph *graph;

       /* network problem object */

       int format;

       /* problem file format: */

 #define FMT_MPS_DECK    1  /* fixed MPS */

 #define FMT_MPS_FILE    2  /* free MPS */

 #define FMT_LP          3  /* CPLEX LP */

 #define FMT_GLP         4  /* GLPK LP/MIP */

 #define FMT_MATHPROG    5  /* MathProg */

 #define FMT_MIN_COST    6  /* DIMACS min-cost flow */

 #define FMT_MAX_FLOW    7  /* DIMACS maximum flow */

       const char *in_file;

       /* name of input problem file */

 #define DATA_MAX 10

       /* maximal number of input data files */

       int ndf;

       /* number of input data files specified */

       const char *in_data[1+DATA_MAX];

       /* name(s) of input data file(s) */

       const char *out_dpy;

       /* name of output file to send display output; NULL means the

          display output is sent to the terminal */

       int seed;

       /* seed value to be passed to the MathProg translator; initially

          set to 1; 0x80000000 means the value is omitted */

       int solution;

       /* solution type flag: */

 #define SOL_BASIC       1  /* basic */

 #define SOL_INTERIOR    2  /* interior-point */

 #define SOL_INTEGER     3  /* mixed integer */

       const char *in_res;

       /* name of input solution file in raw format */

       int dir;

       /* optimization direction flag:

          0       - not specified

          GLP_MIN - minimization

          GLP_MAX - maximization */

       int scale;

       /* automatic problem scaling flag */

       const char *out_sol;

       /* name of output solution file in printable format */

       const char *out_res;

       /* name of output solution file in raw format */

       const char *out_ranges;

       /* name of output file to write sensitivity analysis report */

       int check;

       /* input data checking flag; no solution is performed */

       const char *new_name;

       /* new name to be assigned to the problem */

       const char *out_mps;

       /* name of output problem file in fixed MPS format */

       const char *out_freemps;

       /* name of output problem file in free MPS format */

       const char *out_cpxlp;

       /* name of output problem file in CPLEX LP format */

       const char *out_glp;

       /* name of output problem file in GLPK format */

       const char *out_pb;

       /* name of output problem file in OPB format */

       const char *out_npb;

       /* name of output problem file in normalized OPB format */

       const char *log_file;

       /* name of output file to hardcopy terminal output */

       int crash;

       /* initial basis option: */

 #define USE_STD_BASIS   1  /* use standard basis */

 #define USE_ADV_BASIS   2  /* use advanced basis */

 #define USE_CPX_BASIS   3  /* use Bixby's basis */

 #define USE_INI_BASIS   4  /* use initial basis from ini_file */

       const char *ini_file;

       /* name of input file containing initial basis */

       int exact;

       /* flag to use glp_exact rather than glp_simplex */

       int xcheck;

       /* flag to check final basis with glp_exact */

       int nomip;

       /* flag to consider MIP as pure LP */

 };

 static void print_help(const char *my_name)

 {     /* print help information */

       xprintf("Usage: %s [options...] filename\n", my_name);

       xprintf("\n");

       xprintf("General options:\n");

       xprintf("   --mps             read LP/MIP problem in fixed MPS fo"

          "rmat\n");

       xprintf("   --freemps         read LP/MIP problem in free MPS for"

          "mat (default)\n");

       xprintf("   --lp              read LP/MIP problem in CPLEX LP for"

          "mat\n");

       xprintf("   --glp             read LP/MIP problem in GLPK format "

          "\n");

       xprintf("   --math            read LP/MIP model written in GNU Ma"

          "thProg modeling\n");

       xprintf("                     language\n");

       xprintf("   -m filename, --model filename\n");

       xprintf("                     read model section and optional dat"

          "a section from\n");

       xprintf("                     filename (same as --math)\n");

       xprintf("   -d filename, --data filename\n");

       xprintf("                     read data section from filename (fo"

          "r --math only);\n");

       xprintf("                     if model file also has data section"

          ", it is ignored\n");

       xprintf("   -y filename, --display filename\n");

       xprintf("                     send display output to filename (fo"

          "r --math only);\n");

       xprintf("                     by default the output is sent to te"

          "rminal\n");

       xprintf("   --seed value      initialize pseudo-random number gen"

          "erator used in\n");

       xprintf("                     MathProg model with specified seed "

          "(any integer);\n");

       xprintf("                     if seed value is ?, some random see"

          "d will be used\n");

       xprintf("   --mincost         read min-cost flow problem in DIMAC"

          "S format\n");

       xprintf("   --maxflow         read maximum flow problem in DIMACS"

          " format\n");

       xprintf("   --simplex         use simplex method (default)\n");

       xprintf("   --interior        use interior point method (LP only)"

          "\n");

       xprintf("   -r filename, --read filename\n");

       xprintf("                     read solution from filename rather "

          "to find it with\n");

       xprintf("                     the solver\n");

       xprintf("   --min             minimization\n");

       xprintf("   --max             maximization\n");

       xprintf("   --scale           scale problem (default)\n");

       xprintf("   --noscale         do not scale problem\n");

       xprintf("   -o filename, --output filename\n");

       xprintf("                     write solution to filename in print"

          "able format\n");

       xprintf("   -w filename, --write filename\n");

       xprintf("                     write solution to filename in plain"

          " text format\n");

       xprintf("   --ranges filename\n");

       xprintf("                     write sensitivity analysis report t"

          "o filename in\n");

       xprintf("                     printable format (simplex only)\n");

       xprintf("   --tmlim nnn       limit solution time to nnn seconds "

          "\n");

       xprintf("   --memlim nnn      limit available memory to nnn megab"

          "ytes\n");

       xprintf("   --check           do not solve problem, check input d"

          "ata only\n");

       xprintf("   --name probname   change problem name to probname\n");

       xprintf("   --wmps filename   write problem to filename in fixed "

          "MPS format\n");

       xprintf("   --wfreemps filename\n");

       xprintf("                     write problem to filename in free M"

          "PS format\n");

       xprintf("   --wlp filename    write problem to filename in CPLEX "

          "LP format\n");

       xprintf("   --wglp filename   write problem to filename in GLPK f"

          "ormat\n");

 #if 0

       xprintf("   --wpb filename    write problem to filename in OPB fo"

          "rmat\n");

       xprintf("   --wnpb filename   write problem to filename in normal"

          "ized OPB format\n");

 #endif

       xprintf("   --log filename    write copy of terminal output to fi"

          "lename\n");

       xprintf("   -h, --help        display this help information and e"

          "xit\n");

       xprintf("   -v, --version     display program version and exit\n")

          ;

       xprintf("\n");

       xprintf("LP basis factorization options:\n");

       xprintf("   --luf             LU + Forrest-Tomlin update\n");

       xprintf("                     (faster, less stable; default)\n");

       xprintf("   --cbg             LU + Schur complement + Bartels-Gol"

          "ub update\n");

       xprintf("                     (slower, more stable)\n");

       xprintf("   --cgr             LU + Schur complement + Givens rota"

          "tion update\n");

       xprintf("                     (slower, more stable)\n");

       xprintf("\n");

       xprintf("Options specific to simplex solver:\n");

       xprintf("   --primal          use primal simplex (default)\n");

       xprintf("   --dual            use dual simplex\n");

       xprintf("   --std             use standard initial basis of all s"

          "lacks\n");

       xprintf("   --adv             use advanced initial basis (default"

          ")\n");

       xprintf("   --bib             use Bixby's initial basis\n");

       xprintf("   --ini filename    use as initial basis previously sav"

          "ed with -w\n");

       xprintf("                     (disables LP presolver)\n");

       xprintf("   --steep           use steepest edge technique (defaul"

          "t)\n");

       xprintf("   --nosteep         use standard \"textbook\" pricing\n"

          );

       xprintf("   --relax           use Harris' two-pass ratio test (de"

          "fault)\n");

       xprintf("   --norelax         use standard \"textbook\" ratio tes"

          "t\n");

       xprintf("   --presol          use presolver (default; assumes --s"

          "cale and --adv)\n");

       xprintf("   --nopresol        do not use presolver\n");

       xprintf("   --exact           use simplex method based on exact a"

          "rithmetic\n");

       xprintf("   --xcheck          check final basis using exact arith"

          "metic\n");

       xprintf("\n");

       xprintf("Options specific to interior-point solver:\n");

       xprintf("   --nord            use natural (original) ordering\n");

       xprintf("   --qmd             use quotient minimum degree orderin"

          "g\n");

       xprintf("   --amd             use approximate minimum degree orde"

          "ring (default)\n");

       xprintf("   --symamd          use approximate minimum degree orde"

          "ring\n");

       xprintf("\n");

       xprintf("Options specific to MIP solver:\n");

       xprintf("   --nomip           consider all integer variables as c"

          "ontinuous\n");

       xprintf("                     (allows solving MIP as pure LP)\n");

       xprintf("   --first           branch on first integer variable\n")

          ;

       xprintf("   --last            branch on last integer variable\n");

       xprintf("   --mostf           branch on most fractional variable "

          "\n");

       xprintf("   --drtom           branch using heuristic by Driebeck "

          "and Tomlin\n");

       xprintf("                     (default)\n");

       xprintf("   --pcost           branch using hybrid pseudocost heur"

          "istic (may be\n");

       xprintf("                     useful for hard instances)\n");

       xprintf("   --dfs             backtrack using depth first search "

          "\n");

       xprintf("   --bfs             backtrack using breadth first searc"

          "h\n");

       xprintf("   --bestp           backtrack using the best projection"

          " heuristic\n");

       xprintf("   --bestb           backtrack using node with best loca"

          "l bound\n");

       xprintf("                     (default)\n");

       xprintf("   --intopt          use MIP presolver (default)\n");

       xprintf("   --nointopt        do not use MIP presolver\n");

       xprintf("   --binarize        replace general integer variables b"

          "y binary ones\n");

       xprintf("                     (assumes --intopt)\n");

       xprintf("   --fpump           apply feasibility pump heuristic\n")

          ;

       xprintf("   --gomory          generate Gomory's mixed integer cut"

          "s\n");

       xprintf("   --mir             generate MIR (mixed integer roundin"

          "g) cuts\n");

       xprintf("   --cover           generate mixed cover cuts\n");

       xprintf("   --clique          generate clique cuts\n");

       xprintf("   --cuts            generate all cuts above\n");

       xprintf("   --mipgap tol      set relative mip gap tolerance to t"

          "ol\n");

       xprintf("\n");

       xprintf("For description of the MPS and CPLEX LP formats see Refe"

          "rence Manual.\n");

       xprintf("For description of the modeling language see \"GLPK: Mod"

          "eling Language\n");

       xprintf("GNU MathProg\". Both documents are included in the GLPK "

          "distribution.\n");

       xprintf("\n");

       xprintf("See GLPK web page at <http://www.gnu.org/software/glpk/g"

          "lpk.html>.\n");

       xprintf("\n");

       xprintf("Please report bugs to <bug-glpk@gnu.org>.\n");

       return;

 }

 static void print_version(int briefly)

 {     /* print version information */

       xprintf("GLPSOL: GLPK LP/MIP Solver, v%s\n", glp_version());

       if (briefly) goto done;

       xprintf("\n");

       xprintf("Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, "

          "2007, 2008,\n");

       xprintf("2009, 2010 Andrew Makhorin, Department for Applied Infor"

          "matics, Moscow\n");

       xprintf("Aviation Institute, Moscow, Russia. All rights reserved."

          "\n");

       xprintf("\n");

       xprintf("This program has ABSOLUTELY NO WARRANTY.\n");

       xprintf("\n");

       xprintf("This program is free software; you may re-distribute it "

          "under the terms\n");

       xprintf("of the GNU General Public License version 3 or later.\n")

          ;

 done: return;

 }

 static int parse_cmdline(struct csa *csa, int argc, const char *argv[])

 {     /* parse command-line parameters */

       int k;

 #define p(str) (strcmp(argv[k], str) == 0)

       for (k = 1; k < argc; k++)

       {  if (p("--mps"))

             csa->format = FMT_MPS_DECK;

          else if (p("--freemps"))

             csa->format = FMT_MPS_FILE;

          else if (p("--lp") || p("--cpxlp"))

             csa->format = FMT_LP;

          else if (p("--glp"))

             csa->format = FMT_GLP;

          else if (p("--math") || p("-m") || p("--model"))

             csa->format = FMT_MATHPROG;

          else if (p("-d") || p("--data"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No input data file specified\n");

                return 1;

             }

             if (csa->ndf == DATA_MAX)

             {  xprintf("Too many input data files\n");

                return 1;

             }

             csa->in_data[++(csa->ndf)] = argv[k];

          }

          else if (p("-y") || p("--display"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No display output file specified\n");

                return 1;

             }

             if (csa->out_dpy != NULL)

             {  xprintf("Only one display output file allowed\n");

                return 1;

             }

             csa->out_dpy = argv[k];

          }

          else if (p("--seed"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' ||

                argv[k][0] == '-' && !isdigit((unsigned char)argv[k][1]))

             {  xprintf("No seed value specified\n");

                return 1;

             }

             if (strcmp(argv[k], "?") == 0)

                csa->seed = 0x80000000;

             else if (str2int(argv[k], &csa->seed))

             {  xprintf("Invalid seed value `%s'\n", argv[k]);

                return 1;

             }

          }

          else if (p("--mincost"))

             csa->format = FMT_MIN_COST;

          else if (p("--maxflow"))

             csa->format = FMT_MAX_FLOW;

          else if (p("--simplex"))

             csa->solution = SOL_BASIC;

          else if (p("--interior"))

             csa->solution = SOL_INTERIOR;

 #if 1 /* 28/V-2010 */

          else if (p("--alien"))

             csa->iocp.alien = GLP_ON;

 #endif

          else if (p("-r") || p("--read"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No input solution file specified\n");

                return 1;

             }

             if (csa->in_res != NULL)

             {  xprintf("Only one input solution file allowed\n");

                return 1;

             }

             csa->in_res = argv[k];

          }

          else if (p("--min"))

             csa->dir = GLP_MIN;

          else if (p("--max"))

             csa->dir = GLP_MAX;

          else if (p("--scale"))

             csa->scale = 1;

          else if (p("--noscale"))

             csa->scale = 0;

          else if (p("-o") || p("--output"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No output solution file specified\n");

                return 1;

             }

             if (csa->out_sol != NULL)

             {  xprintf("Only one output solution file allowed\n");

                return 1;

             }

             csa->out_sol = argv[k];

          }

          else if (p("-w") || p("--write"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No output solution file specified\n");

                return 1;

             }

             if (csa->out_res != NULL)

             {  xprintf("Only one output solution file allowed\n");

                return 1;

             }

             csa->out_res = argv[k];

          }

          else if (p("--ranges") || p("--bounds"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No output file specified to write sensitivity a"

                   "nalysis report\n");

                return 1;

             }

             if (csa->out_ranges != NULL)

             {  xprintf("Only one output file allowed to write sensitivi"

                   "ty analysis report\n");

                return 1;

             }

             csa->out_ranges = argv[k];

          }

          else if (p("--tmlim"))

          {  int tm_lim;

             k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No time limit specified\n");

                return 1;

             }

             if (str2int(argv[k], &tm_lim) || tm_lim < 0)

             {  xprintf("Invalid time limit `%s'\n", argv[k]);

                return 1;

             }

             if (tm_lim <= INT_MAX / 1000)

                csa->smcp.tm_lim = csa->iocp.tm_lim = 1000 * tm_lim;

             else

                csa->smcp.tm_lim = csa->iocp.tm_lim = INT_MAX;

          }

          else if (p("--memlim"))

          {  int mem_lim;

             k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No memory limit specified\n");

                return 1;

             }

             if (str2int(argv[k], &mem_lim) || mem_lim < 1)

             {  xprintf("Invalid memory limit `%s'\n", argv[k]);

                return 1;

             }

             glp_mem_limit(mem_lim);

          }

          else if (p("--check"))

             csa->check = 1;

          else if (p("--name"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No problem name specified\n");

                return 1;

             }

             if (csa->new_name != NULL)

             {  xprintf("Only one problem name allowed\n");

                return 1;

             }

             csa->new_name = argv[k];

          }

          else if (p("--wmps"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No fixed MPS output file specified\n");

                return 1;

             }

             if (csa->out_mps != NULL)

             {  xprintf("Only one fixed MPS output file allowed\n");

                return 1;

             }

             csa->out_mps = argv[k];

          }

          else if (p("--wfreemps"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No free MPS output file specified\n");

                return 1;

             }

             if (csa->out_freemps != NULL)

             {  xprintf("Only one free MPS output file allowed\n");

                return 1;

             }

             csa->out_freemps = argv[k];

          }

          else if (p("--wlp") || p("--wcpxlp") || p("--wlpt"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No CPLEX LP output file specified\n");

                return 1;

             }

             if (csa->out_cpxlp != NULL)

             {  xprintf("Only one CPLEX LP output file allowed\n");

                return 1;

             }

             csa->out_cpxlp = argv[k];

          }

          else if (p("--wglp"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No GLPK LP/MIP output file specified\n");

                return 1;

             }

             if (csa->out_glp != NULL)

             {  xprintf("Only one GLPK LP/MIP output file allowed\n");

                return 1;

             }

             csa->out_glp = argv[k];

          }

          else if (p("--wpb"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No problem output file specified\n");

                return 1;

             }

             if (csa->out_pb != NULL)

             {  xprintf("Only one OPB output file allowed\n");

                return 1;

             }

             csa->out_pb = argv[k];

          }

          else if (p("--wnpb"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No problem output file specified\n");

                return 1;

             }

             if (csa->out_npb != NULL)

             {  xprintf("Only one normalized OPB output file allowed\n");

                return 1;

             }

             csa->out_npb = argv[k];

          }

          else if (p("--log"))

          {  k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No log file specified\n");

                return 1;

             }

             if (csa->log_file != NULL)

             {  xprintf("Only one log file allowed\n");

                return 1;

             }

             csa->log_file = argv[k];

          }

          else if (p("-h") || p("--help"))

          {  print_help(argv[0]);

             return -1;

          }

          else if (p("-v") || p("--version"))

          {  print_version(0);

             return -1;

          }

          else if (p("--luf"))

             csa->bfcp.type = GLP_BF_FT;

          else if (p("--cbg"))

             csa->bfcp.type = GLP_BF_BG;

          else if (p("--cgr"))

             csa->bfcp.type = GLP_BF_GR;

          else if (p("--primal"))

             csa->smcp.meth = GLP_PRIMAL;

          else if (p("--dual"))

             csa->smcp.meth = GLP_DUAL;

          else if (p("--std"))

             csa->crash = USE_STD_BASIS;

          else if (p("--adv"))

             csa->crash = USE_ADV_BASIS;

          else if (p("--bib"))

             csa->crash = USE_CPX_BASIS;

          else if (p("--ini"))

          {  csa->crash = USE_INI_BASIS;

             csa->smcp.presolve = GLP_OFF;

             k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No initial basis file specified\n");

                return 1;

             }

             if (csa->ini_file != NULL)

             {  xprintf("Only one initial basis file allowed\n");

                return 1;

             }

             csa->ini_file = argv[k];

          }

          else if (p("--steep"))

             csa->smcp.pricing = GLP_PT_PSE;

          else if (p("--nosteep"))

             csa->smcp.pricing = GLP_PT_STD;

          else if (p("--relax"))

             csa->smcp.r_test = GLP_RT_HAR;

          else if (p("--norelax"))

             csa->smcp.r_test = GLP_RT_STD;

          else if (p("--presol"))

             csa->smcp.presolve = GLP_ON;

          else if (p("--nopresol"))

             csa->smcp.presolve = GLP_OFF;

          else if (p("--exact"))

             csa->exact = 1;

          else if (p("--xcheck"))

             csa->xcheck = 1;

          else if (p("--nord"))

             csa->iptcp.ord_alg = GLP_ORD_NONE;

          else if (p("--qmd"))

             csa->iptcp.ord_alg = GLP_ORD_QMD;

          else if (p("--amd"))

             csa->iptcp.ord_alg = GLP_ORD_AMD;

          else if (p("--symamd"))

             csa->iptcp.ord_alg = GLP_ORD_SYMAMD;

          else if (p("--nomip"))

             csa->nomip = 1;

          else if (p("--first"))

             csa->iocp.br_tech = GLP_BR_FFV;

          else if (p("--last"))

             csa->iocp.br_tech = GLP_BR_LFV;

          else if (p("--drtom"))

             csa->iocp.br_tech = GLP_BR_DTH;

          else if (p("--mostf"))

             csa->iocp.br_tech = GLP_BR_MFV;

          else if (p("--pcost"))

             csa->iocp.br_tech = GLP_BR_PCH;

          else if (p("--dfs"))

             csa->iocp.bt_tech = GLP_BT_DFS;

          else if (p("--bfs"))

             csa->iocp.bt_tech = GLP_BT_BFS;

          else if (p("--bestp"))

             csa->iocp.bt_tech = GLP_BT_BPH;

          else if (p("--bestb"))

             csa->iocp.bt_tech = GLP_BT_BLB;

          else if (p("--intopt"))

             csa->iocp.presolve = GLP_ON;

          else if (p("--nointopt"))

             csa->iocp.presolve = GLP_OFF;

          else if (p("--binarize"))

             csa->iocp.presolve = csa->iocp.binarize = GLP_ON;

          else if (p("--fpump"))

             csa->iocp.fp_heur = GLP_ON;

          else if (p("--gomory"))

             csa->iocp.gmi_cuts = GLP_ON;

          else if (p("--mir"))

             csa->iocp.mir_cuts = GLP_ON;

          else if (p("--cover"))

             csa->iocp.cov_cuts = GLP_ON;

          else if (p("--clique"))

             csa->iocp.clq_cuts = GLP_ON;

          else if (p("--cuts"))

             csa->iocp.gmi_cuts = csa->iocp.mir_cuts =

             csa->iocp.cov_cuts = csa->iocp.clq_cuts = GLP_ON;

          else if (p("--mipgap"))

          {  double mip_gap;

             k++;

             if (k == argc || argv[k][0] == '\0' || argv[k][0] == '-')

             {  xprintf("No relative gap tolerance specified\n");

                return 1;

             }

             if (str2num(argv[k], &mip_gap) || mip_gap < 0.0)

             {  xprintf("Invalid relative mip gap tolerance `%s'\n",

                   argv[k]);

                return 1;

             }

             csa->iocp.mip_gap = mip_gap;

          }

          else if (argv[k][0] == '-' ||

                  (argv[k][0] == '-' && argv[k][1] == '-'))

          {  xprintf("Invalid option `%s'; try %s --help\n",

                argv[k], argv[0]);

             return 1;

          }

          else

          {  if (csa->in_file != NULL)

             {  xprintf("Only one input problem file allowed\n");

                return 1;

             }

             csa->in_file = argv[k];

          }

       }

 #undef p

       return 0;

 }

 typedef struct { double rhs, pi; } v_data;

 typedef struct { double low, cap, cost, x; } a_data;

 int glp_main(int argc, const char *argv[])

 {     /* stand-alone LP/MIP solver */

       struct csa _csa, *csa = &_csa;

       int ret;

       glp_long start;

       /* perform initialization */

       csa->prob = glp_create_prob();

       glp_get_bfcp(csa->prob, &csa->bfcp);

       glp_init_smcp(&csa->smcp);

       csa->smcp.presolve = GLP_ON;

       glp_init_iptcp(&csa->iptcp);

       glp_init_iocp(&csa->iocp);

       csa->iocp.presolve = GLP_ON;

       csa->tran = NULL;

       csa->graph = NULL;

       csa->format = FMT_MPS_FILE;

       csa->in_file = NULL;

       csa->ndf = 0;

       csa->out_dpy = NULL;

       csa->seed = 1;

       csa->solution = SOL_BASIC;

       csa->in_res = NULL;

       csa->dir = 0;

       csa->scale = 1;

       csa->out_sol = NULL;

       csa->out_res = NULL;

       csa->out_ranges = NULL;

       csa->check = 0;

       csa->new_name = NULL;

       csa->out_mps = NULL;

       csa->out_freemps = NULL;

       csa->out_cpxlp = NULL;

       csa->out_glp = NULL;

       csa->out_pb = NULL;

       csa->out_npb = NULL;

       csa->log_file = NULL;

       csa->crash = USE_ADV_BASIS;

       csa->ini_file = NULL;

       csa->exact = 0;

       csa->xcheck = 0;

       csa->nomip = 0;

       /* parse command-line parameters */

       ret = parse_cmdline(csa, argc, argv);

       if (ret < 0)

       {  ret = EXIT_SUCCESS;

          goto done;

       }

       if (ret > 0)

       {  ret = EXIT_FAILURE;

          goto done;

       }

       /*--------------------------------------------------------------*/

       /* remove all output files specified in the command line */

       if (csa->out_dpy != NULL) remove(csa->out_dpy);

       if (csa->out_sol != NULL) remove(csa->out_sol);

       if (csa->out_res != NULL) remove(csa->out_res);

       if (csa->out_ranges != NULL) remove(csa->out_ranges);

       if (csa->out_mps != NULL) remove(csa->out_mps);

       if (csa->out_freemps != NULL) remove(csa->out_freemps);

       if (csa->out_cpxlp != NULL) remove(csa->out_cpxlp);

       if (csa->out_glp != NULL) remove(csa->out_glp);

       if (csa->out_pb != NULL) remove(csa->out_pb);

       if (csa->out_npb != NULL) remove(csa->out_npb);

       if (csa->log_file != NULL) remove(csa->log_file);

       /*--------------------------------------------------------------*/

       /* open log file, if required */

       if (csa->log_file != NULL)

       {  if (glp_open_tee(csa->log_file))

          {  xprintf("Unable to create log file\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       /*--------------------------------------------------------------*/

       /* print version information */

       print_version(1);

       /*--------------------------------------------------------------*/

       /* print parameters specified in the command line */

       if (argc > 1)

       {  int k, len = INT_MAX;

          xprintf("Parameter(s) specified in the command line:");

          for (k = 1; k < argc; k++)

          {  if (len > 72)

                xprintf("\n"), len = 0;

             xprintf(" %s", argv[k]);

             len += 1 + strlen(argv[k]);

          }

          xprintf("\n");

       }

       /*--------------------------------------------------------------*/

       /* read problem data from the input file */

       if (csa->in_file == NULL)

       {  xprintf("No input problem file specified; try %s --help\n",

             argv[0]);

          ret = EXIT_FAILURE;

          goto done;

       }

       if (csa->format == FMT_MPS_DECK)

       {  ret = glp_read_mps(csa->prob, GLP_MPS_DECK, NULL,

             csa->in_file);

          if (ret != 0)

 err1:    {  xprintf("MPS file processing error\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       else if (csa->format == FMT_MPS_FILE)

       {  ret = glp_read_mps(csa->prob, GLP_MPS_FILE, NULL,

             csa->in_file);

          if (ret != 0) goto err1;

       }

       else if (csa->format == FMT_LP)

       {  ret = glp_read_lp(csa->prob, NULL, csa->in_file);

          if (ret != 0)

          {  xprintf("CPLEX LP file processing error\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       else if (csa->format == FMT_GLP)

       {  ret = glp_read_prob(csa->prob, 0, csa->in_file);

          if (ret != 0)

          {  xprintf("GLPK LP/MIP file processing error\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       else if (csa->format == FMT_MATHPROG)

       {  int k;

          /* allocate the translator workspace */

          csa->tran = glp_mpl_alloc_wksp();

          /* set seed value */

          if (csa->seed == 0x80000000)

          {  csa->seed = glp_time().lo;

             xprintf("Seed value %d will be used\n", csa->seed);

          }

          _glp_mpl_init_rand(csa->tran, csa->seed);

          /* read model section and optional data section */

          if (glp_mpl_read_model(csa->tran, csa->in_file, csa->ndf > 0))

 err2:    {  xprintf("MathProg model processing error\n");

             ret = EXIT_FAILURE;

             goto done;

          }

          /* read optional data section(s), if necessary */

          for (k = 1; k <= csa->ndf; k++)

          {  if (glp_mpl_read_data(csa->tran, csa->in_data[k]))

                goto err2;

          }

          /* generate the model */

          if (glp_mpl_generate(csa->tran, csa->out_dpy)) goto err2;

          /* build the problem instance from the model */

          glp_mpl_build_prob(csa->tran, csa->prob);

       }

       else if (csa->format == FMT_MIN_COST)

       {  csa->graph = glp_create_graph(sizeof(v_data), sizeof(a_data));

          ret = glp_read_mincost(csa->graph, offsetof(v_data, rhs),

             offsetof(a_data, low), offsetof(a_data, cap),

             offsetof(a_data, cost), csa->in_file);

          if (ret != 0)

          {  xprintf("DIMACS file processing error\n");

             ret = EXIT_FAILURE;

             goto done;

          }

          glp_mincost_lp(csa->prob, csa->graph, GLP_ON,

             offsetof(v_data, rhs), offsetof(a_data, low),

             offsetof(a_data, cap), offsetof(a_data, cost));

          glp_set_prob_name(csa->prob, csa->in_file);

       }

       else if (csa->format == FMT_MAX_FLOW)

       {  int s, t;

          csa->graph = glp_create_graph(sizeof(v_data), sizeof(a_data));

          ret = glp_read_maxflow(csa->graph, &s, &t,

             offsetof(a_data, cap), csa->in_file);

          if (ret != 0)

          {  xprintf("DIMACS file processing error\n");

             ret = EXIT_FAILURE;

             goto done;

          }

          glp_maxflow_lp(csa->prob, csa->graph, GLP_ON, s, t,

             offsetof(a_data, cap));

          glp_set_prob_name(csa->prob, csa->in_file);

       }

       else

          xassert(csa != csa);

       /*--------------------------------------------------------------*/

       /* change problem name, if required */

       if (csa->new_name != NULL)

          glp_set_prob_name(csa->prob, csa->new_name);

       /* change optimization direction, if required */

       if (csa->dir != 0)

          glp_set_obj_dir(csa->prob, csa->dir);

       /* sort elements of the constraint matrix */

       glp_sort_matrix(csa->prob);

       /*--------------------------------------------------------------*/

       /* write problem data in fixed MPS format, if required */

       if (csa->out_mps != NULL)

       {  ret = glp_write_mps(csa->prob, GLP_MPS_DECK, NULL,

             csa->out_mps);

          if (ret != 0)

          {  xprintf("Unable to write problem in fixed MPS format\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       /* write problem data in free MPS format, if required */

       if (csa->out_freemps != NULL)

       {  ret = glp_write_mps(csa->prob, GLP_MPS_FILE, NULL,

             csa->out_freemps);

          if (ret != 0)

          {  xprintf("Unable to write problem in free MPS format\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       /* write problem data in CPLEX LP format, if required */

       if (csa->out_cpxlp != NULL)

       {  ret = glp_write_lp(csa->prob, NULL, csa->out_cpxlp);

          if (ret != 0)

          {  xprintf("Unable to write problem in CPLEX LP format\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       /* write problem data in GLPK format, if required */

       if (csa->out_glp != NULL)

       {  ret = glp_write_prob(csa->prob, 0, csa->out_glp);

          if (ret != 0)

          {  xprintf("Unable to write problem in GLPK format\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       /* write problem data in OPB format, if required */

       if (csa->out_pb != NULL)

       {  ret = lpx_write_pb(csa->prob, csa->out_pb, 0, 0);

          if (ret != 0)

          {  xprintf("Unable to write problem in OPB format\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       /* write problem data in normalized OPB format, if required */

       if (csa->out_npb != NULL)

       {  ret = lpx_write_pb(csa->prob, csa->out_npb, 1, 1);

          if (ret != 0)

          {  xprintf(

                "Unable to write problem in normalized OPB format\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       /*--------------------------------------------------------------*/

       /* if only problem data check is required, skip computations */

       if (csa->check)

       {  ret = EXIT_SUCCESS;

          goto done;

       }

       /*--------------------------------------------------------------*/

       /* determine the solution type */

       if (!csa->nomip &&

           glp_get_num_int(csa->prob) + glp_get_num_bin(csa->prob) > 0)

       {  if (csa->solution == SOL_INTERIOR)

          {  xprintf("Interior-point method is not able to solve MIP pro"

                "blem; use --simplex\n");

             ret = EXIT_FAILURE;

             goto done;

          }

          csa->solution = SOL_INTEGER;

       }

       /*--------------------------------------------------------------*/

       /* if solution is provided, read it and skip computations */

       if (csa->in_res != NULL)

       {  if (csa->solution == SOL_BASIC)

             ret = glp_read_sol(csa->prob, csa->in_res);

          else if (csa->solution == SOL_INTERIOR)

             ret = glp_read_ipt(csa->prob, csa->in_res);

          else if (csa->solution == SOL_INTEGER)

             ret = glp_read_mip(csa->prob, csa->in_res);

          else

             xassert(csa != csa);

          if (ret != 0)

          {  xprintf("Unable to read problem solution\n");

             ret = EXIT_FAILURE;

             goto done;

          }

          goto skip;

       }

       /*--------------------------------------------------------------*/

       /* scale the problem data, if required */

       if (csa->scale)

       {  if (csa->solution == SOL_BASIC && !csa->smcp.presolve ||

              csa->solution == SOL_INTERIOR ||

              csa->solution == SOL_INTEGER && !csa->iocp.presolve)

             glp_scale_prob(csa->prob, GLP_SF_AUTO);

       }

       /*--------------------------------------------------------------*/

       /* construct starting LP basis */

       if (csa->solution == SOL_BASIC && !csa->smcp.presolve ||

           csa->solution == SOL_INTEGER && !csa->iocp.presolve)

       {  if (csa->crash == USE_STD_BASIS)

             glp_std_basis(csa->prob);

          else if (csa->crash == USE_ADV_BASIS)

             glp_adv_basis(csa->prob, 0);

          else if (csa->crash == USE_CPX_BASIS)

             glp_cpx_basis(csa->prob);

          else if (csa->crash == USE_INI_BASIS)

          {  ret = glp_read_sol(csa->prob, csa->ini_file);

             if (ret != 0)

             {  xprintf("Unable to read initial basis\n");

                ret = EXIT_FAILURE;

                goto done;

             }

          }

          else

             xassert(csa != csa);

       }

       /*--------------------------------------------------------------*/

       /* solve the problem */

       start = xtime();

       if (csa->solution == SOL_BASIC)

       {  if (!csa->exact)

          {  glp_set_bfcp(csa->prob, &csa->bfcp);

             glp_simplex(csa->prob, &csa->smcp);

             if (csa->xcheck)

             {  if (csa->smcp.presolve &&

                    glp_get_status(csa->prob) != GLP_OPT)

                   xprintf("If you need to check final basis for non-opt"

                      "imal solution, use --nopresol\n");

                else

                   glp_exact(csa->prob, &csa->smcp);

             }

             if (csa->out_sol != NULL || csa->out_res != NULL)

             {  if (csa->smcp.presolve &&

                    glp_get_status(csa->prob) != GLP_OPT)

                xprintf("If you need actual output for non-optimal solut"

                   "ion, use --nopresol\n");

             }

          }

          else

             glp_exact(csa->prob, &csa->smcp);

       }

       else if (csa->solution == SOL_INTERIOR)

          glp_interior(csa->prob, &csa->iptcp);

       else if (csa->solution == SOL_INTEGER)

       {  if (!csa->iocp.presolve)

          {  glp_set_bfcp(csa->prob, &csa->bfcp);

             glp_simplex(csa->prob, &csa->smcp);

          }

 #if 0

          csa->iocp.msg_lev = GLP_MSG_DBG;

          csa->iocp.pp_tech = GLP_PP_NONE;

 #endif

          glp_intopt(csa->prob, &csa->iocp);

       }

       else

          xassert(csa != csa);

       /*--------------------------------------------------------------*/

       /* display statistics */

       xprintf("Time used:   %.1f secs\n", xdifftime(xtime(), start));

       {  glp_long tpeak;

          char buf[50];

          glp_mem_usage(NULL, NULL, NULL, &tpeak);

          xprintf("Memory used: %.1f Mb (%s bytes)\n",

             xltod(tpeak) / 1048576.0, xltoa(tpeak, buf));

       }

       /*--------------------------------------------------------------*/

 skip: /* postsolve the model, if necessary */

       if (csa->tran != NULL)

       {  if (csa->solution == SOL_BASIC)

             ret = glp_mpl_postsolve(csa->tran, csa->prob, GLP_SOL);

          else if (csa->solution == SOL_INTERIOR)

             ret = glp_mpl_postsolve(csa->tran, csa->prob, GLP_IPT);

          else if (csa->solution == SOL_INTEGER)

             ret = glp_mpl_postsolve(csa->tran, csa->prob, GLP_MIP);

          else

             xassert(csa != csa);

          if (ret != 0)

          {  xprintf("Model postsolving error\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       /*--------------------------------------------------------------*/

       /* write problem solution in printable format, if required */

       if (csa->out_sol != NULL)

       {  if (csa->solution == SOL_BASIC)

             ret = lpx_print_sol(csa->prob, csa->out_sol);

          else if (csa->solution == SOL_INTERIOR)

             ret = lpx_print_ips(csa->prob, csa->out_sol);

          else if (csa->solution == SOL_INTEGER)

             ret = lpx_print_mip(csa->prob, csa->out_sol);

          else

             xassert(csa != csa);

          if (ret != 0)

          {  xprintf("Unable to write problem solution\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       /* write problem solution in printable format, if required */

       if (csa->out_res != NULL)

       {  if (csa->solution == SOL_BASIC)

             ret = glp_write_sol(csa->prob, csa->out_res);

          else if (csa->solution == SOL_INTERIOR)

             ret = glp_write_ipt(csa->prob, csa->out_res);

          else if (csa->solution == SOL_INTEGER)

             ret = glp_write_mip(csa->prob, csa->out_res);

          else

             xassert(csa != csa);

          if (ret != 0)

          {  xprintf("Unable to write problem solution\n");

             ret = EXIT_FAILURE;

             goto done;

          }

       }

       /* write sensitivity analysis report, if required */

       if (csa->out_ranges != NULL)

       {  if (csa->solution == SOL_BASIC)

          {  if (glp_get_status(csa->prob) == GLP_OPT)

             {  if (glp_bf_exists(csa->prob))

 ranges:        {  ret = glp_print_ranges(csa->prob, 0, NULL, 0,

                      csa->out_ranges);

                   if (ret != 0)

                   {  xprintf("Unable to write sensitivity analysis repo"

                         "rt\n");

                      ret = EXIT_FAILURE;

                      goto done;

                   }

                }

                else

                {  ret = glp_factorize(csa->prob);

                   if (ret == 0) goto ranges;

                   xprintf("Cannot produce sensitivity analysis report d"

                      "ue to error in basis factorization (glp_factorize"

                      " returned %d); try --nopresol\n", ret);

                }

             }

             else

                xprintf("Cannot produce sensitivity analysis report for "

                   "non-optimal basic solution\n");

          }

          else

             xprintf("Cannot produce sensitivity analysis report for int"

                "erior-point or MIP solution\n");

       }

       /*--------------------------------------------------------------*/

       /* all seems to be ok */

       ret = EXIT_SUCCESS;

       /*--------------------------------------------------------------*/

 done: /* delete the LP/MIP problem object */

       if (csa->prob != NULL)

          glp_delete_prob(csa->prob);

       /* free the translator workspace, if necessary */

       if (csa->tran != NULL)

          glp_mpl_free_wksp(csa->tran);

       /* delete the network problem object, if necessary */

       if (csa->graph != NULL)

          glp_delete_graph(csa->graph);

       xassert(gmp_pool_count() == 0);

       gmp_free_mem();

       /* close log file, if necessary */

       if (csa->log_file != NULL) glp_close_tee();

       /* check that no memory blocks are still allocated */

       {  int count;

          glp_long total;

          glp_mem_usage(&count, NULL, &total, NULL);

          if (count != 0)

             xerror("Error: %d memory block(s) were lost\n", count);

          xassert(count == 0);

          xassert(total.lo == 0 && total.hi == 0);

       }

       /* free the GLPK environment */

       glp_free_env();

       /* return to the control program */

       return ret;

 }

 /* eof */