1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 2 /* */ 3 /* This file is part of the program and library */ 4 /* SCIP --- Solving Constraint Integer Programs */ 5 /* */ 6 /* Copyright (C) 2002-2021 Konrad-Zuse-Zentrum */ 7 /* fuer Informationstechnik Berlin */ 8 /* */ 9 /* SCIP is distributed under the terms of the ZIB Academic License. */ 10 /* */ 11 /* You should have received a copy of the ZIB Academic License */ 12 /* along with SCIP; see the file COPYING. If not visit scipopt.org. */ 13 /* */ 14 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 15 16 /**@file presol_dualcomp.h 17 * @ingroup PRESOLVERS 18 * @brief dual compensation presolver 19 * @author Dieter Weninger 20 * 21 * This presolver looks for variables with 22 * i) objcoef >= 0 and exactly one downlock 23 * ii) objcoef <= 0 and exactly one uplock 24 * and fixes the variable in case i) at the lower bound and in case ii) at the 25 * upper bound if a combination of singleton continuous variables can compensate 26 * the downlock in case i) and the uplock in case ii). 27 */ 28 29 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/ 30 31 #ifndef __SCIP_PRESOL_DUALCOMP_H__ 32 #define __SCIP_PRESOL_DUALCOMP_H__ 33 34 #include "scip/def.h" 35 #include "scip/type_retcode.h" 36 #include "scip/type_scip.h" 37 38 #ifdef __cplusplus 39 extern "C" { 40 #endif 41 42 /** creates the dualcomp presolver and includes it in SCIP 43 * 44 * @ingroup PresolverIncludes 45 */ 46 SCIP_EXPORT 47 SCIP_RETCODE SCIPincludePresolDualcomp( 48 SCIP* scip /**< SCIP data structure */ 49 ); 50 51 #ifdef __cplusplus 52 } 53 #endif 54 55 #endif 56