presol_dualcomp.h

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/*                  This file is part of the program and library             */
/*         SCIP --- Solving Constraint Integer Programs                      */
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/*    Copyright (C) 2002-2019 Konrad-Zuse-Zentrum                            */
/*                            fuer Informationstechnik Berlin                */
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/*  SCIP is distributed under the terms of the ZIB Academic License.         */
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/**@file   presol_dualcomp.h
 * @ingroup PRESOLVERS
 * @brief  dual compensation presolver
 * @author Dieter Weninger
 *
 * This presolver looks for variables with
 *         i) objcoef >= 0 and exactly one downlock
 *        ii) objcoef <= 0 and exactly one uplock
 * and fixes the variable in case i) at the lower bound and in case ii) at the
 * upper bound if a combination of singleton continuous variables can compensate
 * the downlock in case i) and the uplock in case ii).
 */

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

#ifndef __SCIP_PRESOL_DUALCOMP_H__
#define __SCIP_PRESOL_DUALCOMP_H__

#include "scip/def.h"
#include "scip/type_retcode.h"
#include "scip/type_scip.h"

#ifdef __cplusplus
extern "C" {
#endif

/** creates the dualcomp presolver and includes it in SCIP
 *
 * @ingroup PresolverIncludes
 */
SCIP_EXPORT
SCIP_RETCODE SCIPincludePresolDualcomp(
   SCIP*                 scip                /**< SCIP data structure */
   );

#ifdef __cplusplus
}
#endif

#endif