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2    	/*                                                                           */
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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");          */
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13   	/*                                                                           */
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19   	/*                                                                           */
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22   	/*                                                                           */
23   	/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
24   	
25   	/**@file   heur_randrounding.h
26   	 * @ingroup PRIMALHEURISTICS
27   	 * @brief  randomized LP rounding heuristic which also generates conflicts via an auxiliary probing tree
28   	 * @author Gregor Hendel
29   	 *
30   	 * Randomized LP rounding uses a random variable from a uniform distribution
31   	 * over [0,1] to determine whether the fractional LP value x should be rounded
32   	 * up with probability x - floor(x) or down with probability ceil(x) - x.
33   	 *
34   	 * This implementation uses domain propagation techniques to tighten the variable domains after every
35   	 * rounding step.
36   	 *
37   	 * @see: The most relevant publication is Raghavan & Thompson,
38   	 *       "Randomized rounding: A technique for provably good algorithms and algorithmic proofs",
39   	 *        Combinatorica 7 (4): 365–374
40   	 *        1987
41   	 */
42   	
43   	/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
44   	
45   	#ifndef __SCIP_HEUR_RANDROUNDING_H__
46   	#define __SCIP_HEUR_RANDROUNDING_H__
47   	
48   	#include "scip/def.h"
49   	#include "scip/type_retcode.h"
50   	#include "scip/type_scip.h"
51   	
52   	#ifdef __cplusplus
53   	extern "C" {
54   	#endif
55   	
56   	/** creates the rand rounding heuristic and includes it in SCIP
57   	 *
58   	 *  @ingroup PrimalHeuristicIncludes
59   	 */
60   	SCIP_EXPORT
61   	SCIP_RETCODE SCIPincludeHeurRandrounding(
62   	   SCIP*                 scip                /**< SCIP data structure */
63   	   );
64   	
65   	#ifdef __cplusplus
66   	}
67   	#endif
68   	
69   	#endif
70