scip_prob.h

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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/*                                                                           */
/*                  This file is part of the program and library             */
/*         SCIP --- Solving Constraint Integer Programs                      */
/*                                                                           */
/*    Copyright (C) 2002-2018 Konrad-Zuse-Zentrum                            */
/*                            fuer Informationstechnik Berlin                */
/*                                                                           */
/*  SCIP is distributed under the terms of the ZIB Academic License.         */
/*                                                                           */
/*  You should have received a copy of the ZIB Academic License              */
/*  along with SCIP; see the file COPYING. If not visit scip.zib.de.         */
/*                                                                           */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/**@file   scip_prob.h
 * @ingroup PUBLICCOREAPI
 * @brief  public methods for global and local (sub)problems
 * @author Tobias Achterberg
 * @author Timo Berthold
 * @author Thorsten Koch
 * @author Alexander Martin
 * @author Marc Pfetsch
 * @author Kati Wolter
 * @author Gregor Hendel
 * @author Robert Lion Gottwald
 */

/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/

#ifndef __SCIP_SCIP_PROB_H__
#define __SCIP_SCIP_PROB_H__


#include "scip/def.h"
#include "scip/type_conflict.h"
#include "scip/type_cons.h"
#include "scip/type_event.h"
#include "scip/type_misc.h"
#include "scip/type_prob.h"
#include "scip/type_result.h"
#include "scip/type_retcode.h"
#include "scip/type_scip.h"
#include "scip/type_sol.h"
#include "scip/type_tree.h"
#include "scip/type_var.h"

/* In debug mode, we include the SCIP's structure in scip.c, such that no one can access
 * this structure except the interface methods in scip.c.
 * In optimized mode, the structure is included in scip.h, because some of the methods
 * are implemented as defines for performance reasons (e.g. the numerical comparisons).
 * Additionally, the internal "set.h" is included, such that the defines in set.h are
 * available in optimized mode.
 */
#ifdef NDEBUG
#include "scip/struct_scip.h"
#include "scip/struct_stat.h"
#include "scip/set.h"
#include "scip/tree.h"
#include "scip/misc.h"
#include "scip/var.h"
#include "scip/cons.h"
#include "scip/solve.h"
#include "scip/debug.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**@addtogroup GlobalProblemMethods
 *
 * @{
 */

/** creates empty problem and initializes all solving data structures (the objective sense is set to MINIMIZE)
 *  If the problem type requires the use of variable pricers, these pricers should be added to the problem with calls
 *  to SCIPactivatePricer(). These pricers are automatically deactivated, when the problem is freed.
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_INIT
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_FREE
 *
 *  @post After calling this method, \SCIP reaches the following stage:
 *        - \ref SCIP_STAGE_PROBLEM
 */
extern
SCIP_RETCODE SCIPcreateProb(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           name,               /**< problem name */
   SCIP_DECL_PROBDELORIG ((*probdelorig)),   /**< frees user data of original problem */
   SCIP_DECL_PROBTRANS   ((*probtrans)),     /**< creates user data of transformed problem by transforming original user data */
   SCIP_DECL_PROBDELTRANS((*probdeltrans)),  /**< frees user data of transformed problem */
   SCIP_DECL_PROBINITSOL ((*probinitsol)),   /**< solving process initialization method of transformed data */
   SCIP_DECL_PROBEXITSOL ((*probexitsol)),   /**< solving process deinitialization method of transformed data */
   SCIP_DECL_PROBCOPY    ((*probcopy)),      /**< copies user data if you want to copy it to a subscip, or NULL */
   SCIP_PROBDATA*        probdata            /**< user problem data set by the reader */
   );

/** creates empty problem and initializes all solving data structures (the objective sense is set to MINIMIZE)
 *  all callback methods will be set to NULL and can be set afterwards, if needed, via SCIPsetProbDelorig(),
 *  SCIPsetProbTrans(), SCIPsetProbDeltrans(), SCIPsetProbInitsol(), SCIPsetProbExitsol(), and
 *  SCIPsetProbCopy()
 *  If the problem type requires the use of variable pricers, these pricers should be added to the problem with calls
 *  to SCIPactivatePricer(). These pricers are automatically deactivated, when the problem is freed.
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_INIT
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_FREE
 *
 *  @post After calling this method, \SCIP reaches the following stage:
 *        - \ref SCIP_STAGE_PROBLEM
 */
extern
SCIP_RETCODE SCIPcreateProbBasic(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           name                /**< problem name */
   );

/** sets callback to free user data of original problem
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 */
extern
SCIP_RETCODE SCIPsetProbDelorig(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_DECL_PROBDELORIG ((*probdelorig))    /**< frees user data of original problem */
   );

/** sets callback to create user data of transformed problem by transforming original user data
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 */
extern
SCIP_RETCODE SCIPsetProbTrans(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_DECL_PROBTRANS   ((*probtrans))      /**< creates user data of transformed problem by transforming original user data */
   );

/** sets callback to free user data of transformed problem
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 */
extern
SCIP_RETCODE SCIPsetProbDeltrans(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_DECL_PROBDELTRANS((*probdeltrans))   /**< frees user data of transformed problem */
   );

/** sets solving process initialization callback of transformed data
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 */
extern
SCIP_RETCODE SCIPsetProbInitsol(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_DECL_PROBINITSOL ((*probinitsol))    /**< solving process initialization method of transformed data */
   );

/** sets solving process deinitialization callback of transformed data
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 */
extern
SCIP_RETCODE SCIPsetProbExitsol(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_DECL_PROBEXITSOL ((*probexitsol))    /**< solving process deinitialization method of transformed data */
   );

/** sets callback to copy user data to a subscip
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 */
extern
SCIP_RETCODE SCIPsetProbCopy(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_DECL_PROBCOPY    ((*probcopy))       /**< copies user data if you want to copy it to a subscip, or NULL */
   );

/** reads problem from file and initializes all solving data structures
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_INIT
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_EXITSOLVE
 *
 *  @post After the method was called, \SCIP is in one of the following stages:
 *       - \ref SCIP_STAGE_INIT if reading failed (usually, when a SCIP_READERROR occurs)
 *       - \ref SCIP_STAGE_PROBLEM if the problem file was successfully read
 */
extern
SCIP_RETCODE SCIPreadProb(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           filename,           /**< problem file name */
   const char*           extension           /**< extension of the desired file reader,
                                              *   or NULL if file extension should be used */
   );

/** writes original problem to file
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_RETCODE SCIPwriteOrigProblem(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           filename,           /**< output file (or NULL for standard output) */
   const char*           extension,          /**< extension of the desired file reader,
                                              *   or NULL if file extension should be used */
   SCIP_Bool             genericnames        /**< use generic variable and constraint names? */
   );

/** writes transformed problem which are valid in the current node to file
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *
 *  @note If you want the write all constraints (including the once which are redundant for example), you need to set
 *        the parameter <write/allconss> to TRUE
 */
extern
SCIP_RETCODE SCIPwriteTransProblem(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           filename,           /**< output file (or NULL for standard output) */
   const char*           extension,          /**< extension of the desired file reader,
                                              *   or NULL if file extension should be used */
   SCIP_Bool             genericnames        /**< using generic variable and constraint names? */
   );

/** frees problem and solution process data
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_INIT
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_FREE
 *
 *  @post After this method was called, SCIP is in the following stage:
 *       - \ref SCIP_STAGE_INIT
 */
extern
SCIP_RETCODE SCIPfreeProb(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** permutes parts of the problem data structure
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 */
extern
SCIP_RETCODE SCIPpermuteProb(
   SCIP*                 scip,               /**< SCIP data structure */
   unsigned int          randseed,           /**< seed value for random generator */
   SCIP_Bool             permuteconss,       /**< should the list of constraints in each constraint handler be permuted? */
   SCIP_Bool             permutebinvars,     /**< should the list of binary variables be permuted? */
   SCIP_Bool             permuteintvars,     /**< should the list of integer variables be permuted? */
   SCIP_Bool             permuteimplvars,    /**< should the list of implicit integer variables be permuted? */
   SCIP_Bool             permutecontvars     /**< should the list of continuous integer variables be permuted? */
   );

/** gets user problem data
 *
 *  @return a SCIP_PROBDATA pointer, or NULL if no problem data was allocated
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_PROBDATA* SCIPgetProbData(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** sets user problem data
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_RETCODE SCIPsetProbData(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_PROBDATA*        probdata            /**< user problem data to use */
   );

/** returns name of the current problem instance
 *
 *  @return name of the current problem instance
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
const char* SCIPgetProbName(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** sets name of the current problem instance
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_RETCODE SCIPsetProbName(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           name                /**< name to be set */
   );

/** changes the objective function
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_PRESOLVED
 *
 *  @note This method should be only used to change the objective function during two reoptimization runs and is only
 *        recommended to an experienced user.
 *
 *  @note All variables not given in \p vars array are assumed to have an objective coefficient of zero.
 */
extern
SCIP_RETCODE SCIPchgReoptObjective(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_OBJSENSE         objsense,           /**< new objective function */
   SCIP_VAR**            vars,               /**< problem variables */
   SCIP_Real*            coefs,              /**< objective coefficients */
   int                   nvars               /**< variables in vars array */
   );

/** returns objective sense of original problem
 *
 *  @return objective sense of original problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_OBJSENSE SCIPgetObjsense(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** sets objective sense of problem
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 */
extern
SCIP_RETCODE SCIPsetObjsense(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_OBJSENSE         objsense            /**< new objective sense */
   );

/** adds offset of objective function
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PRESOLVING
 */
extern
SCIP_RETCODE SCIPaddObjoffset(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_Real             addval              /**< value to add to objective offset */
   );

/** adds offset of objective function to original problem and to all existing solution in original space
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 */
extern
SCIP_RETCODE SCIPaddOrigObjoffset(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_Real             addval              /**< value to add to objective offset */
   );

/** returns the objective offset of the original problem
 *
 *  @return the objective offset of the original problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
SCIP_Real SCIPgetOrigObjoffset(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** returns the objective scale of the original problem
 *
 *  @return the objective scale of the original problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
SCIP_Real SCIPgetOrigObjscale(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** returns the objective offset of the transformed problem
 *
 *  @return the objective offset of the transformed problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
SCIP_Real SCIPgetTransObjoffset(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** returns the objective scale of the transformed problem
 *
 *  @return the objective scale of the transformed problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
SCIP_Real SCIPgetTransObjscale(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** sets limit on objective function, such that only solutions better than this limit are accepted
 *
 *  @note SCIP will only look for solutions with a strictly better objective value, thus, e.g., prune
 *        all branch-and-bound nodes with dual bound equal or worse to the objective limit.
 *        However, SCIP will also collect solutions with objective value worse than the objective limit and
 *        use them to run improvement heuristics on them.
 *  @note If SCIP can prove that there exists no solution with a strictly better objective value, the solving status
 *        will normally be infeasible (the objective limit is interpreted as part of the problem).
 *        The only exception is that by chance, SCIP found a solution with the same objective value and thus
 *        proved the optimality of this solution, resulting in solution status optimal.
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPsetObjlimit(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_Real             objlimit            /**< new primal objective limit */
   );

/** returns current limit on objective function
 *
 *  @return the current objective limit of the original problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
SCIP_Real SCIPgetObjlimit(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** informs SCIP, that the objective value is always integral in every feasible solution
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. otherwise a suitable error code is passed. see \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *
 *  @note This function should be used to inform SCIP that the objective function is integral, helping to improve the
 *        performance. This is useful when using column generation. If no column generation (pricing) is used, SCIP
 *        automatically detects whether the objective function is integral or can be scaled to be integral. However, in
 *        any case, the user has to make sure that no variable is added during the solving process that destroys this
 *        property.
 */
extern
SCIP_RETCODE SCIPsetObjIntegral(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** returns whether the objective value is known to be integral in every feasible solution
 *
 *  @return TRUE, if objective value is known to be always integral, otherwise FALSE
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_SOLVING
 *
 *  @note If no pricing is performed, SCIP automatically detects whether the objective function is integral or can be
 *        scaled to be integral, helping to improve performance. This function returns the result. Otherwise
 *        SCIPsetObjIntegral() can be used to inform SCIP. However, in any case, the user has to make sure that no
 *        variable is added during the solving process that destroys this property.
 */
extern
SCIP_Bool SCIPisObjIntegral(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** returns the Euclidean norm of the objective function vector (available only for transformed problem)
 *
 *  @return the Euclidean norm of the transformed objective function vector
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 */
extern
SCIP_Real SCIPgetObjNorm(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** adds variable to the problem
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPaddVar(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_VAR*             var                 /**< variable to add */
   );

/** adds variable to the problem and uses it as pricing candidate to enter the LP
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can only be called if @p scip is in stage \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPaddPricedVar(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_VAR*             var,                /**< variable to add */
   SCIP_Real             score               /**< pricing score of variable (the larger, the better the variable) */
   );

/** removes variable from the problem
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_RETCODE SCIPdelVar(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_VAR*             var,                /**< variable to delete */
   SCIP_Bool*            deleted             /**< pointer to store whether variable was successfully marked to be deleted */
   );

/** gets variables of the problem along with the numbers of different variable types; data may become invalid after
 *  calls to SCIPchgVarType(), SCIPfixVar(), SCIPaggregateVars(), and SCIPmultiaggregateVar()
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *
 *  @note Variables in the vars array are ordered: binaries first, then integers, implicit integers and continuous last.
 */
extern
SCIP_RETCODE SCIPgetVarsData(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_VAR***           vars,               /**< pointer to store variables array or NULL if not needed */
   int*                  nvars,              /**< pointer to store number of variables or NULL if not needed */
   int*                  nbinvars,           /**< pointer to store number of binary variables or NULL if not needed */
   int*                  nintvars,           /**< pointer to store number of integer variables or NULL if not needed */
   int*                  nimplvars,          /**< pointer to store number of implicit integral vars or NULL if not needed */
   int*                  ncontvars           /**< pointer to store number of continuous variables or NULL if not needed */
   );

/** gets array with active problem variables
 *
 *  @return array with active problem variables
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *
 *  @warning If your are using the methods which add or change bound of variables (e.g., SCIPchgVarType(), SCIPfixVar(),
 *           SCIPaggregateVars(), and SCIPmultiaggregateVar()), it can happen that the internal variable array (which is
 *           accessed via this method) gets resized and/or resorted. This can invalid the data pointer which is returned
 *           by this method.
 *
 *  @note Variables in the array are ordered: binaries first, then integers, implicit integers and continuous last.
 */
extern
SCIP_VAR** SCIPgetVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of active problem variables
 *
 *  @return the number of active problem variables
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 */
extern
int SCIPgetNVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of binary active problem variables
 *
 *  @return the number of binary active problem variables
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 */
extern
int SCIPgetNBinVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of integer active problem variables
 *
 *  @return the number of integer active problem variables
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 */
extern
int SCIPgetNIntVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of implicit integer active problem variables
 *
 *  @return the number of implicit integer active problem variables
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 */
extern
int SCIPgetNImplVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of continuous active problem variables
 *
 *  @return the number of continuous active problem variables
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 */
extern
int SCIPgetNContVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of active problem variables with a non-zero objective coefficient
 *
 *  @note In case of the original problem the number of variables is counted. In case of the transformed problem the
 *        number of variables is just returned since it is stored internally
 *
 *  @return the number of active problem variables with a non-zero objective coefficient
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
int SCIPgetNObjVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets array with fixed and aggregated problem variables; data may become invalid after
 *  calls to SCIPfixVar(), SCIPaggregateVars(), and SCIPmultiaggregateVar()
 *
 *  @return an array with fixed and aggregated problem variables; data may become invalid after
 *          calls to SCIPfixVar(), SCIPaggregateVars(), and SCIPmultiaggregateVar()
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
SCIP_VAR** SCIPgetFixedVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of fixed or aggregated problem variables
 *
 *  @return the number of fixed or aggregated problem variables
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
int SCIPgetNFixedVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets variables of the original problem along with the numbers of different variable types; data may become invalid
 *  after a call to SCIPchgVarType()
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_RETCODE SCIPgetOrigVarsData(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_VAR***           vars,               /**< pointer to store variables array or NULL if not needed */
   int*                  nvars,              /**< pointer to store number of variables or NULL if not needed */
   int*                  nbinvars,           /**< pointer to store number of binary variables or NULL if not needed */
   int*                  nintvars,           /**< pointer to store number of integer variables or NULL if not needed */
   int*                  nimplvars,          /**< pointer to store number of implicit integral vars or NULL if not needed */
   int*                  ncontvars           /**< pointer to store number of continuous variables or NULL if not needed */
   );

/** gets array with original problem variables; data may become invalid after
 *  a call to SCIPchgVarType()
 *
 *  @return an array with original problem variables; data may become invalid after
 *          a call to SCIPchgVarType()
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_VAR** SCIPgetOrigVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of original problem variables
 *
 *  @return the number of original problem variables
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
int SCIPgetNOrigVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of binary variables in the original problem
 *
 *  @return the number of binary variables in the original problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
int SCIPgetNOrigBinVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets the number of integer variables in the original problem
 *
 *  @return the number of integer variables in the original problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
int SCIPgetNOrigIntVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of implicit integer variables in the original problem
 *
 *  @return the number of implicit integer variables in the original problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
int SCIPgetNOrigImplVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of continuous variables in the original problem
 *
 *  @return the number of continuous variables in the original problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
int SCIPgetNOrigContVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets number of all problem variables created during creation and solving of problem;
 *  this includes also variables that were deleted in the meantime
 *
 *  @return the number of all problem variables created during creation and solving of problem;
 *          this includes also variables that were deleted in the meantime
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
int SCIPgetNTotalVars(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets variables of the original or transformed problem along with the numbers of different variable types;
 *  the returned problem space (original or transformed) corresponds to the given solution;
 *  data may become invalid after calls to SCIPchgVarType(), SCIPfixVar(), SCIPaggregateVars(), and
 *  SCIPmultiaggregateVar()
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
SCIP_RETCODE SCIPgetSolVarsData(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_SOL*             sol,                /**< primal solution that selects the problem space, NULL for current solution */
   SCIP_VAR***           vars,               /**< pointer to store variables array or NULL if not needed */
   int*                  nvars,              /**< pointer to store number of variables or NULL if not needed */
   int*                  nbinvars,           /**< pointer to store number of binary variables or NULL if not needed */
   int*                  nintvars,           /**< pointer to store number of integer variables or NULL if not needed */
   int*                  nimplvars,          /**< pointer to store number of implicit integral vars or NULL if not needed */
   int*                  ncontvars           /**< pointer to store number of continuous variables or NULL if not needed */
   );

/** returns variable of given name in the problem, or NULL if not existing
 *
 *  @return variable of given name in the problem, or NULL if not existing
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_VAR* SCIPfindVar(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           name                /**< name of variable to find */
   );

/** returns TRUE iff all potential variables exist in the problem, and FALSE, if there may be additional variables,
 *  that will be added in pricing and improve the objective value
 *
 *  @return TRUE, if all potential variables exist in the problem; FALSE, otherwise
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_Bool SCIPallVarsInProb(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** adds constraint to the problem; if constraint is only valid locally, it is added to the local subproblem of the
 *  current node (and all of its subnodes); otherwise it is added to the global problem;
 *  if a local constraint is added at the root node, it is automatically upgraded into a global constraint
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_EXITSOLVE
 */
extern
SCIP_RETCODE SCIPaddCons(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_CONS*            cons                /**< constraint to add */
   );

/** globally removes constraint from all subproblems; removes constraint from the constraint set change data of the
 *  node, where it was added, or from the problem, if it was a problem constraint
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_EXITSOLVE
 */
extern
SCIP_RETCODE SCIPdelCons(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_CONS*            cons                /**< constraint to delete */
   );

/** returns original constraint of given name in the problem, or NULL if not existing
 *
 *  @return original constraint of given name in the problem, or NULL if not existing
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS */
extern
SCIP_CONS* SCIPfindOrigCons(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           name                /**< name of constraint to find */
   );

/** returns constraint of given name in the problem, or NULL if not existing
 *
 *  @return constraint of given name in the problem, or NULL if not existing
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_CONS* SCIPfindCons(
   SCIP*                 scip,               /**< SCIP data structure */
   const char*           name                /**< name of constraint to find */
   );

/** gets number of upgraded constraints
 *
 *  @return number of upgraded constraints
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
int SCIPgetNUpgrConss(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets total number of globally valid constraints currently in the problem
 *
 *  @return total number of globally valid constraints currently in the problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 */
extern
int SCIPgetNConss(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets array of globally valid constraints currently in the problem
 *
 *  @return array of globally valid constraints currently in the problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *
 *  @warning If your are using the method SCIPaddCons(), it can happen that the internal constraint array (which is
 *           accessed via this method) gets resized. This can invalid the pointer which is returned by this method.
 */
extern
SCIP_CONS** SCIPgetConss(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets total number of constraints in the original problem
 *
 *  @return total number of constraints in the original problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
int SCIPgetNOrigConss(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets array of constraints in the original problem
 *
 *  @return array of constraints in the original problem
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_TRANSFORMING
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *       - \ref SCIP_STAGE_SOLVED
 *       - \ref SCIP_STAGE_EXITSOLVE
 *       - \ref SCIP_STAGE_FREETRANS
 */
extern
SCIP_CONS** SCIPgetOrigConss(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** computes the number of check constraint in the current node (loop over all constraint handler and cumulates the
 *  number of check constraints)
 *
 *  @return returns the number of check constraints
 *
 *  @pre This method can be called if @p scip is in one of the following stages:
 *       - \ref SCIP_STAGE_TRANSFORMED
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_INITSOLVE
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
int SCIPgetNCheckConss(
   SCIP*                 scip                /**< SCIP data structure */
   );

/**@} */

/**@addtogroup LocalSubproblemMethods
 *
 * @{
 */

/** adds a conflict to a given node or globally to the problem if @p node == NULL.
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *
 *  @note this method will release the constraint
 */
extern
SCIP_RETCODE SCIPaddConflict(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_NODE*            node,               /**< node to add conflict (or NULL if global) */
   SCIP_CONS*            cons,               /**< constraint representing the conflict */
   SCIP_NODE*            validnode,          /**< node at which the constraint is valid (or NULL) */
   SCIP_CONFTYPE         conftype,           /**< type of the conflict */
   SCIP_Bool             iscutoffinvolved    /**< is a cutoff bound involved in this conflict */
   );

/** removes all conflicts depending on an old cutoff bound if the improvement of the incumbent is good enough
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPclearConflictStore(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_EVENT*           event               /**< event data */
   );

/** adds constraint to the given node (and all of its subnodes), even if it is a global constraint;
 *  It is sometimes desirable to add the constraint to a more local node (i.e., a node of larger depth) even if
 *  the constraint is also valid higher in the tree, for example, if one wants to produce a constraint which is
 *  only active in a small part of the tree although it is valid in a larger part.
 *  In this case, one should pass the more global node where the constraint is valid as "validnode".
 *  Note that the same constraint cannot be added twice to the branching tree with different "validnode" parameters.
 *  If the constraint is valid at the same node as it is inserted (the usual case), one should pass NULL as "validnode".
 *  If the "validnode" is the root node, it is automatically upgraded into a global constraint, but still only added to
 *  the given node. If a local constraint is added to the root node, it is added to the global problem instead.
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPaddConsNode(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_NODE*            node,               /**< node to add constraint to */
   SCIP_CONS*            cons,               /**< constraint to add */
   SCIP_NODE*            validnode           /**< node at which the constraint is valid, or NULL */
   );

/** adds constraint locally to the current node (and all of its subnodes), even if it is a global constraint;
 *  It is sometimes desirable to add the constraint to a more local node (i.e., a node of larger depth) even if
 *  the constraint is also valid higher in the tree, for example, if one wants to produce a constraint which is
 *  only active in a small part of the tree although it is valid in a larger part.
 *
 *  If the constraint is valid at the same node as it is inserted (the usual case), one should pass NULL as "validnode".
 *  If the "validnode" is the root node, it is automatically upgraded into a global constraint, but still only added to
 *  the given node. If a local constraint is added to the root node, it is added to the global problem instead.
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_SOLVING
 *
 *  @note The same constraint cannot be added twice to the branching tree with different "validnode" parameters. This is
 *        the case due internal data structures and performance issues. In such a case you should try to realize your
 *        issue using the method SCIPdisableCons() and SCIPenableCons() and control these via the event system of SCIP.
 */
extern
SCIP_RETCODE SCIPaddConsLocal(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_CONS*            cons,               /**< constraint to add */
   SCIP_NODE*            validnode           /**< node at which the constraint is valid, or NULL */
   );

/** disables constraint's separation, enforcing, and propagation capabilities at the given node (and all subnodes);
 *  if the method is called at the root node, the constraint is globally deleted from the problem;
 *  the constraint deletion is being remembered at the given node, s.t. after leaving the node's subtree, the constraint
 *  is automatically enabled again, and after entering the node's subtree, it is automatically disabled;
 *  this may improve performance because redundant checks on this constraint are avoided, but it consumes memory;
 *  alternatively, use SCIPdisableCons()
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPdelConsNode(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_NODE*            node,               /**< node to disable constraint in */
   SCIP_CONS*            cons                /**< constraint to locally delete */
   );

/** disables constraint's separation, enforcing, and propagation capabilities at the current node (and all subnodes);
 *  if the method is called during problem modification or at the root node, the constraint is globally deleted from
 *  the problem;
 *  the constraint deletion is being remembered at the current node, s.t. after leaving the current subtree, the
 *  constraint is automatically enabled again, and after reentering the current node's subtree, it is automatically
 *  disabled again;
 *  this may improve performance because redundant checks on this constraint are avoided, but it consumes memory;
 *  alternatively, use SCIPdisableCons()
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_INITPRESOLVE
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_EXITPRESOLVE
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPdelConsLocal(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_CONS*            cons                /**< constraint to locally delete */
   );

/** gets estimate of best primal solution w.r.t. original problem contained in current subtree
 *
 *  @return estimate of best primal solution w.r.t. original problem contained in current subtree
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_Real SCIPgetLocalOrigEstimate(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets estimate of best primal solution w.r.t. transformed problem contained in current subtree
 *
 *  @return estimate of best primal solution w.r.t. transformed problem contained in current subtree
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_Real SCIPgetLocalTransEstimate(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets dual bound of current node
 *
 *  @return dual bound of current node
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_Real SCIPgetLocalDualbound(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets lower bound of current node in transformed problem
 *
 *  @return lower bound  of current node in transformed problem
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_Real SCIPgetLocalLowerbound(
   SCIP*                 scip                /**< SCIP data structure */
   );

/** gets dual bound of given node
 *
 *  @return dual bound of a given node
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_Real SCIPgetNodeDualbound(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_NODE*            node                /**< node to get dual bound for */
   );

/** gets lower bound of given node in transformed problem
 *
 *  @return lower bound  of given node in transformed problem
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_Real SCIPgetNodeLowerbound(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_NODE*            node                /**< node to get dual bound for */
   );

/** if given value is tighter (larger for minimization, smaller for maximization) than the current node's dual bound (in
 *  original problem space), sets the current node's dual bound to the new value
 *
 *  @note the given new bound has to be a dual bound, i.e., it has to be valid for the original problem.
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_PROBLEM
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPupdateLocalDualbound(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_Real             newbound            /**< new dual bound for the node (if it's tighter than the old one) */
   );

/** if given value is larger than the current node's lower bound (in transformed problem), sets the current node's
 *  lower bound to the new value
 *
 *  @note the given new bound has to be a lower bound, i.e., it has to be valid for the transformed problem.
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_PRESOLVING
 *       - \ref SCIP_STAGE_PRESOLVED
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPupdateLocalLowerbound(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_Real             newbound            /**< new lower bound for the node (if it's larger than the old one) */
   );

/** if given value is tighter (larger for minimization, smaller for maximization) than the node's dual bound,
 *  sets the node's dual bound to the new value
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPupdateNodeDualbound(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_NODE*            node,               /**< node to update dual bound for */
   SCIP_Real             newbound            /**< new dual bound for the node (if it's tighter than the old one) */
   );

/** if given value is larger than the node's lower bound (in transformed problem), sets the node's lower bound
 *  to the new value
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPupdateNodeLowerbound(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_NODE*            node,               /**< node to update lower bound for */
   SCIP_Real             newbound            /**< new lower bound for the node (if it's larger than the old one) */
   );

/** change the node selection priority of the given child
 *
 *  @return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref
 *          SCIP_Retcode "SCIP_RETCODE" for a complete list of error codes.
 *
 *  @pre this method can be called in one of the following stages of the SCIP solving process:
 *       - \ref SCIP_STAGE_SOLVING
 */
extern
SCIP_RETCODE SCIPchgChildPrio(
   SCIP*                 scip,               /**< SCIP data structure */
   SCIP_NODE*            child,              /**< child to update the node selection priority */
   SCIP_Real             priority            /**< node selection priority value */
   );

/**@} */

#ifdef __cplusplus
}
#endif

#endif