lemon/suurballe.h
changeset 2375 e30a0fdad0d7
parent 2276 1a8a66b6c6ce
child 2376 0ed45a6c74b1
equal deleted inserted replaced
4:262a124c6522 5:4339c6a59475
    24 ///\brief An algorithm for finding k paths of minimal total length.
    24 ///\brief An algorithm for finding k paths of minimal total length.
    25 
    25 
    26 
    26 
    27 #include <lemon/maps.h>
    27 #include <lemon/maps.h>
    28 #include <vector>
    28 #include <vector>
       
    29 #include <lemon/path.h>
    29 #include <lemon/ssp_min_cost_flow.h>
    30 #include <lemon/ssp_min_cost_flow.h>
    30 
    31 
    31 namespace lemon {
    32 namespace lemon {
    32 
    33 
    33 /// \addtogroup flowalgs
    34 /// \addtogroup flowalgs
    80     ConstMap const1map;
    81     ConstMap const1map;
    81     //This MinCostFlow instance will actually solve the problem
    82     //This MinCostFlow instance will actually solve the problem
    82     SspMinCostFlow<Graph, LengthMap, ConstMap> min_cost_flow;
    83     SspMinCostFlow<Graph, LengthMap, ConstMap> min_cost_flow;
    83 
    84 
    84     //Container to store found paths
    85     //Container to store found paths
    85     std::vector< std::vector<Edge> > paths;
    86     std::vector<SimplePath<Graph> > paths;
    86 
    87 
    87   public :
    88   public :
    88 
    89 
    89 
    90 
    90     /// \brief The constructor of the class.
    91     /// \brief The constructor of the class.
   132 	  
   133 	  
   133 	  while (!reversed[e]){
   134 	  while (!reversed[e]){
   134 	    ++e;
   135 	    ++e;
   135 	  }
   136 	  }
   136 	  n = G.target(e);
   137 	  n = G.target(e);
   137 	  paths[j].push_back(e);
   138 	  paths[j].addBack(e);
   138 	  reversed[e] = 1-reversed[e];
   139 	  reversed[e] = 1-reversed[e];
   139 	}
   140 	}
   140 	
   141 	
   141       }
   142       }
   142       return i;
   143       return i;
   168     /// with feasibility.  It is meant for testing purposes.
   169     /// with feasibility.  It is meant for testing purposes.
   169     bool checkComplementarySlackness(){
   170     bool checkComplementarySlackness(){
   170       return min_cost_flow.checkComplementarySlackness();
   171       return min_cost_flow.checkComplementarySlackness();
   171     }
   172     }
   172 
   173 
       
   174     typedef SimplePath<Graph> Path; 
       
   175 
   173     /// \brief Read the found paths.
   176     /// \brief Read the found paths.
   174     ///
   177     ///
   175     /// This function gives back the \c j-th path in argument p.
   178     /// This function gives back the \c j-th path in argument p.
   176     /// Assumes that \c run() has been run and nothing has changed
   179     /// Assumes that \c run() has been run and nothing has changed
   177     /// since then.
   180     /// since then.
   179     /// \warning It is assumed that \c p is constructed to be a path
   182     /// \warning It is assumed that \c p is constructed to be a path
   180     /// of graph \c G.  If \c j is not less than the result of
   183     /// of graph \c G.  If \c j is not less than the result of
   181     /// previous \c run, then the result here will be an empty path
   184     /// previous \c run, then the result here will be an empty path
   182     /// (\c j can be 0 as well).
   185     /// (\c j can be 0 as well).
   183     ///
   186     ///
   184     /// \param Path The type of the path structure to put the result
       
   185     /// to (must meet lemon path concept).
       
   186     /// \param p The path to put the result to.
       
   187     /// \param j Which path you want to get from the found paths (in a
   187     /// \param j Which path you want to get from the found paths (in a
   188     /// real application you would get the found paths iteratively).
   188     /// real application you would get the found paths iteratively).
   189     template<typename Path>
   189     Path path(int j) const {
   190     void getPath(Path& p, size_t j){
   190       return paths[j];
   191 
   191     }
   192       p.clear();
   192 
   193       if (j>paths.size()-1){
   193     /// \brief Gives back the number of the paths.
   194 	return;
   194     ///
   195       }
   195     /// Gives back the number of the constructed paths.
   196       typename Path::Builder B(p);
   196     int pathNum() const {
   197       for(typename std::vector<Edge>::iterator i=paths[j].begin(); 
   197       return paths.size();
   198 	  i!=paths[j].end(); ++i ){
       
   199 	B.pushBack(*i);
       
   200       }
       
   201 
       
   202       B.commit();
       
   203     }
   198     }
   204 
   199 
   205   }; //class Suurballe
   200   }; //class Suurballe
   206 
   201 
   207   ///@}
   202   ///@}