1.1 --- a/src/demo/lp_maxflow_demo.cc Sat May 21 21:04:57 2005 +0000
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,86 +0,0 @@
1.4 -#ifdef HAVE_CONFIG_H
1.5 -#include <config.h>
1.6 -#endif
1.7 -
1.8 -#include<lemon/graph_reader.h>
1.9 -#include<lemon/list_graph.h>
1.10 -
1.11 -
1.12 -#ifdef HAVE_GLPK
1.13 -#include <lemon/lp_glpk.h>
1.14 -#elif HAVE_CPLEX
1.15 -#include <lemon/lp_cplex.h>
1.16 -#endif
1.17 -
1.18 -using namespace lemon;
1.19 -
1.20 -#ifdef HAVE_GLPK
1.21 -typedef LpGlpk LpDefault;
1.22 -#elif HAVE_CPLEX
1.23 -typedef LpCplex LpDefault;
1.24 -#endif
1.25 -
1.26 -
1.27 -template<class G,class C>
1.28 -double maxFlow(const G &g,const C &cap,typename G::Node s,typename G::Node t)
1.29 -{
1.30 - LpDefault lp;
1.31 -
1.32 - typedef G Graph;
1.33 - typedef typename G::Node Node;
1.34 - typedef typename G::NodeIt NodeIt;
1.35 - typedef typename G::Edge Edge;
1.36 - typedef typename G::EdgeIt EdgeIt;
1.37 - typedef typename G::OutEdgeIt OutEdgeIt;
1.38 - typedef typename G::InEdgeIt InEdgeIt;
1.39 -
1.40 - typename G::template EdgeMap<LpDefault::Col> x(g);
1.41 - lp.addColSet(x);
1.42 -
1.43 - for(EdgeIt e(g);e!=INVALID;++e) {
1.44 - lp.colUpperBound(x[e],cap[e]);
1.45 - lp.colLowerBound(x[e],0);
1.46 - }
1.47 -
1.48 - for(NodeIt n(g);n!=INVALID;++n) if(n!=s&&n!=t) {
1.49 - LpDefault::Expr ex;
1.50 - for(InEdgeIt e(g,n);e!=INVALID;++e) ex+=x[e];
1.51 - for(OutEdgeIt e(g,n);e!=INVALID;++e) ex-=x[e];
1.52 - lp.addRow(ex==0);
1.53 - }
1.54 - {
1.55 - LpDefault::Expr ex;
1.56 - for(InEdgeIt e(g,t);e!=INVALID;++e) ex+=x[e];
1.57 - for(OutEdgeIt e(g,t);e!=INVALID;++e) ex-=x[e];
1.58 - lp.setObj(ex);
1.59 - }
1.60 - lp.max();
1.61 -
1.62 -#ifdef HAVE_GLPK
1.63 - lp.presolver(true);
1.64 - lp.messageLevel(3);
1.65 -#endif
1.66 -
1.67 - lp.solve();
1.68 -
1.69 - return lp.primalValue();
1.70 -}
1.71 -
1.72 -int main()
1.73 -{
1.74 - ListGraph g;
1.75 - ListGraph::Node s;
1.76 - ListGraph::Node t;
1.77 -
1.78 - ListGraph::EdgeMap<double> cap(g);
1.79 -
1.80 - GraphReader<ListGraph> reader(std::cin,g);
1.81 - reader.readNode("source",s).readNode("target",t)
1.82 - .readEdgeMap("capacity",cap).run();
1.83 -
1.84 - // std::ifstream file("../test/preflow_");
1.85 -// readDimacs(file, g, cap, s, t);
1.86 -
1.87 - std::cout << "Max flow value = " << maxFlow(g,cap,s,t) << std::endl;
1.88 -
1.89 -}