1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 2 /* */ 3 /* This file is part of the program and library */ 4 /* SCIP --- Solving Constraint Integer Programs */ 5 /* */ 6 /* Copyright (c) 2002-2023 Zuse Institute Berlin (ZIB) */ 7 /* */ 8 /* Licensed under the Apache License, Version 2.0 (the "License"); */ 9 /* you may not use this file except in compliance with the License. */ 10 /* You may obtain a copy of the License at */ 11 /* */ 12 /* http://www.apache.org/licenses/LICENSE-2.0 */ 13 /* */ 14 /* Unless required by applicable law or agreed to in writing, software */ 15 /* distributed under the License is distributed on an "AS IS" BASIS, */ 16 /* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */ 17 /* See the License for the specific language governing permissions and */ 18 /* limitations under the License. */ 19 /* */ 20 /* You should have received a copy of the Apache-2.0 license */ 21 /* along with SCIP; see the file LICENSE. If not visit scipopt.org. */ 22 /* */ 23 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ 24 25 /**@file heur_oneopt.h 26 * @ingroup PRIMALHEURISTICS 27 * @brief Improvement heuristic that alters single variable values 28 * @author Timo Berthold 29 * 30 * Oneopt is a straightforward improvement heuristic: given a feasible MIP solution, the value of 31 * an integer variable x<sub>j</sub> can be decreased for c<sub>j</sub> > 0 or increased for c<sub>j</sub> < 0 32 * if the resulting solution is still feasible. If more than one variable can be shifted, they are sorted by 33 * non-decreasing impact on the objective and sequentially shifted until no more improvements can be 34 * obtained. 35 */ 36 37 /*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/ 38 39 #ifndef __SCIP_HEUR_ONEOPT_H__ 40 #define __SCIP_HEUR_ONEOPT_H__ 41 42 #include "scip/def.h" 43 #include "scip/type_retcode.h" 44 #include "scip/type_scip.h" 45 46 #ifdef __cplusplus 47 extern "C" { 48 #endif 49 50 /** creates the oneopt primal heuristic and includes it in SCIP 51 * 52 * @ingroup PrimalHeuristicIncludes 53 */ 54 SCIP_EXPORT 55 SCIP_RETCODE SCIPincludeHeurOneopt( 56 SCIP* scip /**< SCIP data structure */ 57 ); 58 59 #ifdef __cplusplus 60 } 61 #endif 62 63 #endif 64