marci@174: // -*- c++ -*-
marci@259: #ifndef HUGO_EDMONDS_KARP_H
marci@259: #define HUGO_EDMONDS_KARP_H
marci@174: 
marci@174: #include <algorithm>
marci@174: #include <list>
marci@174: #include <iterator>
marci@174: 
marci@174: #include <bfs_iterator.h>
marci@174: #include <invalid.h>
marci@174: 
marci@174: namespace hugo {
marci@174: 
marci@174:   template<typename Graph, typename Number, typename FlowMap, typename CapacityMap>
marci@174:   class ResGraph {
marci@174:   public:
marci@174:     typedef typename Graph::Node Node;
marci@174:     typedef typename Graph::NodeIt NodeIt;
marci@174:   private:
marci@174:     typedef typename Graph::SymEdgeIt OldSymEdgeIt;
marci@174:     const Graph& G;
marci@174:     FlowMap& flow;
marci@174:     const CapacityMap& capacity;
marci@174:   public:
marci@174:     ResGraph(const Graph& _G, FlowMap& _flow, 
marci@174: 	     const CapacityMap& _capacity) : 
marci@174:       G(_G), flow(_flow), capacity(_capacity) { }
marci@174: 
marci@174:     class Edge; 
marci@174:     class OutEdgeIt; 
marci@174:     friend class Edge; 
marci@174:     friend class OutEdgeIt; 
marci@174: 
marci@174:     class Edge {
marci@174:       friend class ResGraph<Graph, Number, FlowMap, CapacityMap>;
marci@174:     protected:
marci@174:       const ResGraph<Graph, Number, FlowMap, CapacityMap>* resG;
marci@174:       OldSymEdgeIt sym;
marci@174:     public:
marci@174:       Edge() { } 
marci@174:       //Edge(const Edge& e) : resG(e.resG), sym(e.sym) { }
marci@174:       Number free() const { 
marci@174: 	if (resG->G.aNode(sym)==resG->G.tail(sym)) { 
marci@174: 	  return (resG->capacity.get(sym)-resG->flow.get(sym)); 
marci@174: 	} else { 
marci@174: 	  return (resG->flow.get(sym)); 
marci@174: 	}
marci@174:       }
marci@174:       bool valid() const { return sym.valid(); }
marci@174:       void augment(Number a) const {
marci@174: 	if (resG->G.aNode(sym)==resG->G.tail(sym)) { 
marci@174: 	  resG->flow.set(sym, resG->flow.get(sym)+a);
marci@174: 	  //resG->flow[sym]+=a;
marci@174: 	} else { 
marci@174: 	  resG->flow.set(sym, resG->flow.get(sym)-a);
marci@174: 	  //resG->flow[sym]-=a;
marci@174: 	}
marci@174:       }
marci@174:     };
marci@174: 
marci@174:     class OutEdgeIt : public Edge {
marci@174:       friend class ResGraph<Graph, Number, FlowMap, CapacityMap>;
marci@174:     public:
marci@174:       OutEdgeIt() { }
marci@174:       //OutEdgeIt(const OutEdgeIt& e) { resG=e.resG; sym=e.sym; }
marci@174:     private:
marci@174:       OutEdgeIt(const ResGraph<Graph, Number, FlowMap, CapacityMap>& _resG, Node v) { 
marci@174:       	resG=&_resG;
marci@174: 	sym=resG->G.template first<OldSymEdgeIt>(v);
marci@174: 	while( sym.valid() && !(free()>0) ) { ++sym; }
marci@174:       }
marci@174:     public:
marci@174:       OutEdgeIt& operator++() { 
marci@174: 	++sym; 
marci@174: 	while( sym.valid() && !(free()>0) ) { ++sym; }
marci@174: 	return *this; 
marci@174:       }
marci@174:     };
marci@174: 
marci@174:     void /*getF*/first(OutEdgeIt& e, Node v) const { 
marci@174:       e=OutEdgeIt(*this, v); 
marci@174:     }
marci@174:     void /*getF*/first(NodeIt& v) const { G./*getF*/first(v); }
marci@174:     
marci@174:     template< typename It >
marci@174:     It first() const { 
marci@174:       It e;      
marci@174:       /*getF*/first(e);
marci@174:       return e; 
marci@174:     }
marci@174: 
marci@174:     template< typename It >
marci@174:     It first(Node v) const { 
marci@174:       It e;
marci@174:       /*getF*/first(e, v);
marci@174:       return e; 
marci@174:     }
marci@174: 
marci@174:     Node tail(Edge e) const { return G.aNode(e.sym); }
marci@174:     Node head(Edge e) const { return G.bNode(e.sym); }
marci@174: 
marci@174:     Node aNode(OutEdgeIt e) const { return G.aNode(e.sym); }
marci@174:     Node bNode(OutEdgeIt e) const { return G.bNode(e.sym); }
marci@174: 
marci@174:     int id(Node v) const { return G.id(v); }
marci@174: 
marci@174:     template <typename S>
marci@174:     class NodeMap {
marci@174:       typename Graph::NodeMap<S> node_map; 
marci@174:     public:
marci@174:       NodeMap(const ResGraph<Graph, Number, FlowMap, CapacityMap>& _G) : node_map(_G.G) { }
marci@174:       NodeMap(const ResGraph<Graph, Number, FlowMap, CapacityMap>& _G, S a) : node_map(_G.G, a) { }
marci@174:       void set(Node nit, S a) { node_map.set(nit, a); }
marci@174:       S get(Node nit) const { return node_map.get(nit); }
marci@174:       S& operator[](Node nit) { return node_map[nit]; } 
marci@174:       const S& operator[](Node nit) const { return node_map[nit]; } 
marci@174:     };
marci@174: 
marci@174:   };
marci@174: 
marci@174: 
marci@174:   template<typename Graph, typename Number, typename FlowMap, typename CapacityMap>
marci@174:   class ResGraph2 {
marci@174:   public:
marci@174:     typedef typename Graph::Node Node;
marci@174:     typedef typename Graph::NodeIt NodeIt;
marci@174:   private:
marci@174:     //typedef typename Graph::SymEdgeIt OldSymEdgeIt;
marci@174:     typedef typename Graph::OutEdgeIt OldOutEdgeIt;
marci@174:     typedef typename Graph::InEdgeIt OldInEdgeIt;
marci@174:     
marci@174:     const Graph& G;
marci@174:     FlowMap& flow;
marci@174:     const CapacityMap& capacity;
marci@174:   public:
marci@174:     ResGraph2(const Graph& _G, FlowMap& _flow, 
marci@174: 	     const CapacityMap& _capacity) : 
marci@174:       G(_G), flow(_flow), capacity(_capacity) { }
marci@174: 
marci@174:     class Edge; 
marci@174:     class OutEdgeIt; 
marci@174:     friend class Edge; 
marci@174:     friend class OutEdgeIt; 
marci@174: 
marci@174:     class Edge {
marci@174:       friend class ResGraph2<Graph, Number, FlowMap, CapacityMap>;
marci@174:     protected:
marci@174:       const ResGraph2<Graph, Number, FlowMap, CapacityMap>* resG;
marci@174:       //OldSymEdgeIt sym;
marci@174:       OldOutEdgeIt out;
marci@174:       OldInEdgeIt in;
marci@174:       bool out_or_in; //true, iff out
marci@174:     public:
marci@174:       Edge() : out_or_in(true) { } 
marci@174:       Number free() const { 
marci@174: 	if (out_or_in) { 
marci@174: 	  return (resG->capacity.get(out)-resG->flow.get(out)); 
marci@174: 	} else { 
marci@174: 	  return (resG->flow.get(in)); 
marci@174: 	}
marci@174:       }
marci@174:       bool valid() const { 
marci@174: 	return out_or_in && out.valid() || in.valid(); }
marci@174:       void augment(Number a) const {
marci@174: 	if (out_or_in) { 
marci@174: 	  resG->flow.set(out, resG->flow.get(out)+a);
marci@174: 	} else { 
marci@174: 	  resG->flow.set(in, resG->flow.get(in)-a);
marci@174: 	}
marci@174:       }
marci@174:     };
marci@174: 
marci@174:     class OutEdgeIt : public Edge {
marci@174:       friend class ResGraph2<Graph, Number, FlowMap, CapacityMap>;
marci@174:     public:
marci@174:       OutEdgeIt() { }
marci@174:     private:
marci@174:       OutEdgeIt(const ResGraph2<Graph, Number, FlowMap, CapacityMap>& _resG, Node v) { 
marci@174:       	resG=&_resG;
marci@174: 	out=resG->G.template first<OldOutEdgeIt>(v);
marci@174: 	while( out.valid() && !(free()>0) ) { ++out; }
marci@174: 	if (!out.valid()) {
marci@174: 	  out_or_in=0;
marci@174: 	  in=resG->G.template first<OldInEdgeIt>(v);
marci@174: 	  while( in.valid() && !(free()>0) ) { ++in; }
marci@174: 	}
marci@174:       }
marci@174:     public:
marci@174:       OutEdgeIt& operator++() { 
marci@174: 	if (out_or_in) {
marci@174: 	  Node v=resG->G.aNode(out);
marci@174: 	  ++out;
marci@174: 	  while( out.valid() && !(free()>0) ) { ++out; }
marci@174: 	  if (!out.valid()) {
marci@174: 	    out_or_in=0;
marci@174: 	    in=resG->G.template first<OldInEdgeIt>(v);
marci@174: 	    while( in.valid() && !(free()>0) ) { ++in; }
marci@174: 	  }
marci@174: 	} else {
marci@174: 	  ++in;
marci@174: 	  while( in.valid() && !(free()>0) ) { ++in; } 
marci@174: 	}
marci@174: 	return *this; 
marci@174:       }
marci@174:     };
marci@174: 
marci@174:     void /*getF*/first(OutEdgeIt& e, Node v) const { 
marci@174:       e=OutEdgeIt(*this, v); 
marci@174:     }
marci@174:     void /*getF*/first(NodeIt& v) const { G./*getF*/first(v); }
marci@174:     
marci@174:     template< typename It >
marci@174:     It first() const { 
marci@174:       It e;
marci@174:       /*getF*/first(e);
marci@174:       return e; 
marci@174:     }
marci@174: 
marci@174:     template< typename It >
marci@174:     It first(Node v) const { 
marci@174:       It e;
marci@174:       /*getF*/first(e, v);
marci@174:       return e; 
marci@174:     }
marci@174: 
marci@174:     Node tail(Edge e) const { 
marci@174:       return ((e.out_or_in) ? G.aNode(e.out) : G.aNode(e.in)); }
marci@174:     Node head(Edge e) const { 
marci@174:       return ((e.out_or_in) ? G.bNode(e.out) : G.bNode(e.in)); }
marci@174: 
marci@174:     Node aNode(OutEdgeIt e) const { 
marci@174:       return ((e.out_or_in) ? G.aNode(e.out) : G.aNode(e.in)); }
marci@174:     Node bNode(OutEdgeIt e) const { 
marci@174:       return ((e.out_or_in) ? G.bNode(e.out) : G.bNode(e.in)); }
marci@174: 
marci@174:     int id(Node v) const { return G.id(v); }
marci@174: 
marci@174:     template <typename S>
marci@174:     class NodeMap {
marci@174:       typename Graph::NodeMap<S> node_map; 
marci@174:     public:
marci@174:       NodeMap(const ResGraph2<Graph, Number, FlowMap, CapacityMap>& _G) : node_map(_G.G) { }
marci@174:       NodeMap(const ResGraph2<Graph, Number, FlowMap, CapacityMap>& _G, S a) : node_map(_G.G, a) { }
marci@174:       void set(Node nit, S a) { node_map.set(nit, a); }
marci@174:       S get(Node nit) const { return node_map.get(nit); }
marci@174:     };
marci@174:   };
marci@174: 
marci@174: 
marci@266:   template <typename GraphWrapper, typename Number, typename FlowMap, typename CapacityMap>
marci@174:   class MaxFlow {
marci@269:   protected:
marci@269:     typedef GraphWrapper GW;
marci@269:     typedef typename GW::Node Node;
marci@269:     typedef typename GW::Edge Edge;
marci@269:     typedef typename GW::EdgeIt EdgeIt;
marci@269:     typedef typename GW::OutEdgeIt OutEdgeIt;
marci@269:     typedef typename GW::InEdgeIt InEdgeIt;
marci@266:     //const Graph* G;
marci@269:     GW gw;
marci@174:     Node s;
marci@174:     Node t;
marci@174:     FlowMap* flow;
marci@174:     const CapacityMap* capacity;
marci@269:     typedef ResGraphWrapper<GW, Number, FlowMap, CapacityMap > ResGW;
marci@269:     typedef typename ResGW::OutEdgeIt ResGWOutEdgeIt;
marci@269:     typedef typename ResGW::Edge ResGWEdge;
marci@269:   public:
marci@174: 
marci@269:     MaxFlow(const GW& _gw, Node _s, Node _t, FlowMap& _flow, const CapacityMap& _capacity) : 
marci@266:       gw(_gw), s(_s), t(_t), flow(&_flow), capacity(&_capacity) { }
marci@269: 
marci@174:     bool augmentOnShortestPath() {
marci@269:       ResGW res_graph(gw, *flow, *capacity);
marci@174:       bool _augment=false;
marci@174:       
marci@269:       typedef typename ResGW::NodeMap<bool> ReachedMap;
marci@269:       BfsIterator5< ResGW, ReachedMap > bfs(res_graph);
marci@269:       bfs.pushAndSetReached(s);
marci@174: 	
marci@269:       typename ResGW::NodeMap<ResGWEdge> pred(res_graph); 
marci@269:       pred.set(s, INVALID);
marci@174:       
marci@269:       typename ResGW::NodeMap<Number> free(res_graph);
marci@174: 	
marci@174:       //searching for augmenting path
marci@269:       while ( !bfs.finished() ) { 
marci@269: 	ResGWOutEdgeIt e=bfs;
marci@269: 	if (res_graph.valid(e) && bfs.isBNodeNewlyReached()) {
marci@174: 	  Node v=res_graph.tail(e);
marci@174: 	  Node w=res_graph.head(e);
marci@174: 	  pred.set(w, e);
marci@174: 	  if (res_graph.valid(pred.get(v))) {
marci@269: 	    free.set(w, std::min(free.get(v), res_graph.resCap(e)));
marci@174: 	  } else {
marci@269: 	    free.set(w, res_graph.resCap(e)); 
marci@174: 	  }
marci@174: 	  if (res_graph.head(e)==t) { _augment=true; break; }
marci@174: 	}
marci@174: 	
marci@269: 	++bfs;
marci@174:       } //end of searching augmenting path
marci@174: 
marci@174:       if (_augment) {
marci@174: 	Node n=t;
marci@174: 	Number augment_value=free.get(t);
marci@174: 	while (res_graph.valid(pred.get(n))) { 
marci@269: 	  ResGWEdge e=pred.get(n);
marci@174: 	  res_graph.augment(e, augment_value); 
marci@174: 	  n=res_graph.tail(e);
marci@174: 	}
marci@174:       }
marci@174: 
marci@174:       return _augment;
marci@174:     }
marci@174: 
marci@266:     template<typename MapGraphWrapper> 
marci@263:     class DistanceMap {
marci@263:     protected:
marci@266:       MapGraphWrapper gw;
marci@266:       typename MapGraphWrapper::NodeMap<int> dist; 
marci@263:     public:
marci@266:       DistanceMap(MapGraphWrapper& _gw) : gw(_gw), dist(_gw, _gw.nodeNum()) { }
marci@266:       void set(const typename MapGraphWrapper::Node& n, int a) { dist[n]=a; }
marci@266:       int get(const typename MapGraphWrapper::Node& n) const { return dist[n]; }
marci@266:       bool get(const typename MapGraphWrapper::Edge& e) const { 
marci@263: 	return (dist.get(gw.tail(e))<dist.get(gw.head(e))); 
marci@263:       }
marci@263:     };
marci@263: 
marci@191:     template<typename MutableGraph> bool augmentOnBlockingFlow() {      
marci@269:       typedef MutableGraph MG;
marci@174:       bool _augment=false;
marci@174: 
marci@269:       ResGW res_graph(gw, *flow, *capacity);
marci@174: 
marci@269:       typedef typename ResGW::NodeMap<bool> ReachedMap;
marci@269:       BfsIterator5< ResGW, ReachedMap > bfs(res_graph);
marci@174: 
marci@174:       bfs.pushAndSetReached(s);
marci@269:       //typename ResGW::NodeMap<int> dist(res_graph); //filled up with 0's
marci@269:       DistanceMap<ResGW> dist(res_graph);
marci@174:       while ( !bfs.finished() ) { 
marci@269: 	ResGWOutEdgeIt e=bfs;
marci@174: 	if (res_graph.valid(e) && bfs.isBNodeNewlyReached()) {
marci@174: 	  dist.set(res_graph.head(e), dist.get(res_graph.tail(e))+1);
marci@174: 	}
marci@174: 	++bfs;
marci@174:       } //computing distances from s in the residual graph
marci@174: 
marci@269:       MG F;
marci@269:       typedef SubGraphWrapper<ResGW, DistanceMap<ResGW> > FilterResGW;
marci@269:       FilterResGW filter_res_graph(res_graph, dist);
marci@269:       typename ResGW::NodeMap<typename MG::Node> res_graph_to_F(res_graph);
marci@269:       for(typename ResGW::NodeIt n=res_graph.template first<typename ResGW::NodeIt>(); res_graph.valid(n); res_graph.next(n)) {
marci@174: 	res_graph_to_F.set(n, F.addNode());
marci@174:       }
marci@174: 
marci@269:       typename MG::Node sF=res_graph_to_F.get(s);
marci@269:       typename MG::Node tF=res_graph_to_F.get(t);
marci@269:       typename MG::EdgeMap<ResGWEdge> original_edge(F);
marci@269:       typename MG::EdgeMap<Number> residual_capacity(F);
marci@174: 
marci@174:       //Making F to the graph containing the edges of the residual graph 
marci@174:       //which are in some shortest paths
marci@269:       for(typename FilterResGW::EdgeIt e=filter_res_graph.template first<typename FilterResGW::EdgeIt>(); filter_res_graph.valid(e); filter_res_graph.next(e)) {
marci@266: 	//if (dist.get(res_graph.head(e))==dist.get(res_graph.tail(e))+1) {
marci@269: 	  typename MG::Edge f=F.addEdge(res_graph_to_F.get(res_graph.tail(e)), res_graph_to_F.get(res_graph.head(e)));
marci@174: 	  original_edge.update();
marci@174: 	  original_edge.set(f, e);
marci@174: 	  residual_capacity.update();
marci@269: 	  residual_capacity.set(f, res_graph.resCap(e));
marci@266: 	  //} 
marci@174:       }
marci@174: 
marci@174:       bool __augment=true;
marci@174: 
marci@174:       while (__augment) {
marci@174: 	__augment=false;
marci@174: 	//computing blocking flow with dfs
marci@269: 	typedef typename TrivGraphWrapper<MG>::NodeMap<bool> BlockingReachedMap;
marci@269: 	DfsIterator5< TrivGraphWrapper<MG>, BlockingReachedMap > dfs(F);
marci@269: 	typename MG::NodeMap<typename MG::Edge> pred(F);
marci@269: 	pred.set(sF, INVALID);
marci@174: 	//invalid iterators for sources
marci@174: 
marci@269: 	typename MG::NodeMap<Number> free(F);
marci@174: 
marci@174: 	dfs.pushAndSetReached(sF);      
marci@174: 	while (!dfs.finished()) {
marci@174: 	  ++dfs;
marci@269: 	  if (F.valid(/*typename MG::OutEdgeIt*/(dfs))) {
marci@174: 	    if (dfs.isBNodeNewlyReached()) {
marci@269: 	      typename MG::Node v=F.aNode(dfs);
marci@269: 	      typename MG::Node w=F.bNode(dfs);
marci@174: 	      pred.set(w, dfs);
marci@174: 	      if (F.valid(pred.get(v))) {
marci@174: 		free.set(w, std::min(free.get(v), residual_capacity.get(dfs)));
marci@174: 	      } else {
marci@174: 		free.set(w, residual_capacity.get(dfs)); 
marci@174: 	      }
marci@174: 	      if (w==tF) { 
marci@174: 		__augment=true; 
marci@174: 		_augment=true;
marci@174: 		break; 
marci@174: 	      }
marci@174: 	      
marci@174: 	    } else {
marci@269: 	      F.erase(/*typename MG::OutEdgeIt*/(dfs));
marci@174: 	    }
marci@174: 	  } 
marci@174: 	}
marci@174: 
marci@174: 	if (__augment) {
marci@269: 	  typename MG::Node n=tF;
marci@174: 	  Number augment_value=free.get(tF);
marci@174: 	  while (F.valid(pred.get(n))) { 
marci@269: 	    typename MG::Edge e=pred.get(n);
marci@174: 	    res_graph.augment(original_edge.get(e), augment_value); 
marci@174: 	    n=F.tail(e);
marci@174: 	    if (residual_capacity.get(e)==augment_value) 
marci@174: 	      F.erase(e); 
marci@174: 	    else 
marci@174: 	      residual_capacity.set(e, residual_capacity.get(e)-augment_value);
marci@174: 	  }
marci@174: 	}
marci@174: 	
marci@174:       }
marci@174:             
marci@174:       return _augment;
marci@174:     }
marci@263: 
marci@268:     template<typename MutableGraph> bool augmentOnBlockingFlow1() {      
marci@269:       typedef MutableGraph MG;
marci@268:       bool _augment=false;
marci@193: 
marci@269:       ResGW res_graph(gw, *flow, *capacity);
marci@193: 
marci@268:       //bfs for distances on the residual graph
marci@269:       typedef typename ResGW::NodeMap<bool> ReachedMap;
marci@269:       BfsIterator5< ResGW, ReachedMap > bfs(res_graph);
marci@268:       bfs.pushAndSetReached(s);
marci@269:       typename ResGW::NodeMap<int> dist(res_graph); //filled up with 0's
marci@193: 
marci@268:       //F will contain the physical copy of the residual graph
marci@269:       //with the set of edges which are on shortest paths
marci@269:       MG F;
marci@269:       typename ResGW::NodeMap<typename MG::Node> res_graph_to_F(res_graph);
marci@269:       for(typename ResGW::NodeIt n=res_graph.template first<typename ResGW::NodeIt>(); res_graph.valid(n); res_graph.next(n)) {
marci@268: 	res_graph_to_F.set(n, F.addNode());
marci@268:       }
marci@269: 
marci@269:       typename MG::Node sF=res_graph_to_F.get(s);
marci@269:       typename MG::Node tF=res_graph_to_F.get(t);
marci@269:       typename MG::EdgeMap<ResGWEdge> original_edge(F);
marci@269:       typename MG::EdgeMap<Number> residual_capacity(F);
marci@193: 
marci@268:       while ( !bfs.finished() ) { 
marci@269: 	ResGWOutEdgeIt e=bfs;
marci@268: 	if (res_graph.valid(e)) {
marci@268: 	  if (bfs.isBNodeNewlyReached()) {
marci@268: 	    dist.set(res_graph.head(e), dist.get(res_graph.tail(e))+1);
marci@269: 	    typename MG::Edge f=F.addEdge(res_graph_to_F.get(res_graph.tail(e)), res_graph_to_F.get(res_graph.head(e)));
marci@268: 	    original_edge.update();
marci@268: 	    original_edge.set(f, e);
marci@268: 	    residual_capacity.update();
marci@269: 	    residual_capacity.set(f, res_graph.resCap(e));
marci@268: 	  } else {
marci@268: 	    if (dist.get(res_graph.head(e))==(dist.get(res_graph.tail(e))+1)) {
marci@269: 	      typename MG::Edge f=F.addEdge(res_graph_to_F.get(res_graph.tail(e)), res_graph_to_F.get(res_graph.head(e)));
marci@268: 	      original_edge.update();
marci@268: 	      original_edge.set(f, e);
marci@268: 	      residual_capacity.update();
marci@269: 	      residual_capacity.set(f, res_graph.resCap(e));
marci@268: 	    }
marci@268: 	  }
marci@268: 	}
marci@268: 	++bfs;
marci@268:       } //computing distances from s in the residual graph
marci@193: 
marci@268:       bool __augment=true;
marci@193: 
marci@268:       while (__augment) {
marci@268: 	__augment=false;
marci@268: 	//computing blocking flow with dfs
marci@269: 	typedef typename TrivGraphWrapper<MG>::NodeMap<bool> BlockingReachedMap;
marci@269: 	DfsIterator5< TrivGraphWrapper<MG>, BlockingReachedMap > dfs(F);
marci@269: 	typename MG::NodeMap<typename MG::Edge> pred(F);
marci@269: 	pred.set(sF, INVALID);
marci@268: 	//invalid iterators for sources
marci@193: 
marci@269: 	typename MG::NodeMap<Number> free(F);
marci@193: 
marci@268: 	dfs.pushAndSetReached(sF);      
marci@268: 	while (!dfs.finished()) {
marci@268: 	  ++dfs;
marci@269: 	  if (F.valid(/*typename MG::OutEdgeIt*/(dfs))) {
marci@268: 	    if (dfs.isBNodeNewlyReached()) {
marci@269: 	      typename MG::Node v=F.aNode(dfs);
marci@269: 	      typename MG::Node w=F.bNode(dfs);
marci@268: 	      pred.set(w, dfs);
marci@268: 	      if (F.valid(pred.get(v))) {
marci@268: 		free.set(w, std::min(free.get(v), residual_capacity.get(dfs)));
marci@268: 	      } else {
marci@268: 		free.set(w, residual_capacity.get(dfs)); 
marci@268: 	      }
marci@268: 	      if (w==tF) { 
marci@268: 		__augment=true; 
marci@268: 		_augment=true;
marci@268: 		break; 
marci@268: 	      }
marci@193: 	      
marci@268: 	    } else {
marci@269: 	      F.erase(/*typename MG::OutEdgeIt*/(dfs));
marci@268: 	    }
marci@268: 	  } 
marci@268: 	}
marci@193: 
marci@268: 	if (__augment) {
marci@269: 	  typename MG::Node n=tF;
marci@268: 	  Number augment_value=free.get(tF);
marci@268: 	  while (F.valid(pred.get(n))) { 
marci@269: 	    typename MG::Edge e=pred.get(n);
marci@268: 	    res_graph.augment(original_edge.get(e), augment_value); 
marci@268: 	    n=F.tail(e);
marci@268: 	    if (residual_capacity.get(e)==augment_value) 
marci@268: 	      F.erase(e); 
marci@268: 	    else 
marci@268: 	      residual_capacity.set(e, residual_capacity.get(e)-augment_value);
marci@268: 	  }
marci@268: 	}
marci@193: 	
marci@268:       }
marci@193:             
marci@268:       return _augment;
marci@268:     }
marci@268: 
marci@269:     bool augmentOnBlockingFlow2() {
marci@269:       bool _augment=false;
marci@269: 
marci@269:       ResGW res_graph(gw, *flow, *capacity);
marci@269: 
marci@269:       typedef typename ResGW::NodeMap<bool> ReachedMap;
marci@269:       BfsIterator5< ResGW, ReachedMap > bfs(res_graph);
marci@269: 
marci@269:       bfs.pushAndSetReached(s);
marci@269:       DistanceMap<ResGW> dist(res_graph);
marci@269:       while ( !bfs.finished() ) { 
marci@269:  	ResGWOutEdgeIt e=bfs;
marci@269:  	if (res_graph.valid(e) && bfs.isBNodeNewlyReached()) {
marci@269:  	  dist.set(res_graph.head(e), dist.get(res_graph.tail(e))+1);
marci@269:  	}
marci@269: 	++bfs;
marci@269:       } //computing distances from s in the residual graph
marci@269: 
marci@269:       //Subgraph containing the edges on some shortest paths
marci@269:       typedef SubGraphWrapper<ResGW, DistanceMap<ResGW> > FilterResGW;
marci@269:       FilterResGW filter_res_graph(res_graph, dist);
marci@269: 
marci@269:       //Subgraph, which is able to delete edges which are already 
marci@269:       //met by the dfs
marci@269:       typename FilterResGW::NodeMap<typename FilterResGW::OutEdgeIt> 
marci@269:  	first_out_edges(filter_res_graph);
marci@269:       typename FilterResGW::NodeIt v;
marci@269:       for(filter_res_graph.first(v); filter_res_graph.valid(v); 
marci@269:  	  filter_res_graph.next(v)) 
marci@269:       {
marci@269:  	typename FilterResGW::OutEdgeIt e;
marci@269:  	filter_res_graph.first(e, v);
marci@269:  	first_out_edges.set(v, e);
marci@269:       }
marci@269:       typedef ErasingFirstGraphWrapper<FilterResGW, typename FilterResGW::
marci@269: 	NodeMap<typename FilterResGW::OutEdgeIt> > ErasingResGW;
marci@269:       ErasingResGW erasing_res_graph(filter_res_graph, first_out_edges);
marci@269: 
marci@269:       bool __augment=true;
marci@269: 
marci@269:       while (__augment) {
marci@269: 
marci@269:  	__augment=false;
marci@269:  	//computing blocking flow with dfs
marci@269: 	typedef typename ErasingResGW::NodeMap<bool> BlockingReachedMap;
marci@269:  	DfsIterator5< ErasingResGW, BlockingReachedMap > 
marci@269:  	  dfs(erasing_res_graph);
marci@269:  	typename ErasingResGW::NodeMap<typename ErasingResGW::OutEdgeIt> 
marci@269:  	  pred(erasing_res_graph); 
marci@269:  	pred.set(s, INVALID);
marci@269:  	//invalid iterators for sources
marci@269: 
marci@269:  	typename ErasingResGW::NodeMap<Number> free(erasing_res_graph);
marci@269: 
marci@269:  	dfs.pushAndSetReached(s);
marci@269:  	while (!dfs.finished()) {
marci@269:  	  ++dfs;
marci@269:  	  if (erasing_res_graph.valid(
marci@269:  		/*typename ErasingResGW::OutEdgeIt*/(dfs))) 
marci@269:  	  { 
marci@269:  	    if (dfs.isBNodeNewlyReached()) {
marci@269: 	  
marci@269:  	      typename ErasingResGW::Node v=erasing_res_graph.aNode(dfs);
marci@269:  	      typename ErasingResGW::Node w=erasing_res_graph.bNode(dfs);
marci@269: 
marci@269:  	      pred.set(w, /*typename ErasingResGW::OutEdgeIt*/(dfs));
marci@269:  	      if (erasing_res_graph.valid(pred.get(v))) {
marci@269:  		free.set(w, std::min(free.get(v), res_graph.resCap(dfs)));
marci@269:  	      } else {
marci@269:  		free.set(w, res_graph.resCap(dfs)); 
marci@269:  	      }
marci@269: 	      
marci@269:  	      if (w==t) { 
marci@269:  		__augment=true; 
marci@269:  		_augment=true;
marci@269:  		break; 
marci@269:  	      }
marci@269: 	    } else {
marci@269: 	      erasing_res_graph.erase(dfs);
marci@269: 	    }
marci@269: 	  }
marci@269: 	}	
marci@269: 
marci@269:  	if (__augment) {
marci@269:  	  typename ErasingResGW::Node n=t;
marci@269:  	  Number augment_value=free.get(n);
marci@269:  	  while (erasing_res_graph.valid(pred.get(n))) { 
marci@269:  	    typename ErasingResGW::OutEdgeIt e=pred.get(n);
marci@269:  	    res_graph.augment(e, augment_value);
marci@269:  	    n=erasing_res_graph.tail(e);
marci@269:  	    if (res_graph.resCap(e)==0)
marci@269:  	      erasing_res_graph.erase(e);
marci@269:  	  }
marci@269:  	}
marci@269:       
marci@269:       } //while (__augment) 
marci@269:             
marci@269:       return _augment;
marci@269:     }
marci@269: 
marci@266: //     bool augmentOnBlockingFlow2() {
marci@266: //       bool _augment=false;
marci@193: 
marci@266: //       //typedef ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap> EAugGraph;
marci@266: //       typedef FilterGraphWrapper< ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap> > EAugGraph;
marci@266: //       typedef typename EAugGraph::OutEdgeIt EAugOutEdgeIt;
marci@266: //       typedef typename EAugGraph::Edge EAugEdge;
marci@193: 
marci@266: //       EAugGraph res_graph(*G, *flow, *capacity);
marci@193: 
marci@266: //       //typedef typename EAugGraph::NodeMap<bool> ReachedMap;
marci@266: //       BfsIterator5< 
marci@266: // 	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>, 
marci@266: // 	/*typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::OutEdgeIt,*/ 
marci@266: // 	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<bool> > bfs(res_graph);
marci@266:       
marci@266: //       bfs.pushAndSetReached(s);
marci@197: 
marci@266: //       typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::
marci@266: // 	NodeMap<int>& dist=res_graph.dist;
marci@197: 
marci@266: //       while ( !bfs.finished() ) {
marci@266: // 	typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::OutEdgeIt e=bfs;
marci@266: // 	if (res_graph.valid(e) && bfs.isBNodeNewlyReached()) {
marci@266: // 	  dist.set(res_graph.head(e), dist.get(res_graph.tail(e))+1);
marci@266: // 	}
marci@266: // 	++bfs;	
marci@266: //       } //computing distances from s in the residual graph
marci@197: 
marci@266: //       bool __augment=true;
marci@266: 
marci@266: //       while (__augment) {
marci@266: 
marci@266: // 	__augment=false;
marci@266: // 	//computing blocking flow with dfs
marci@266: // 	typedef typename EAugGraph::NodeMap<bool> BlockingReachedMap;
marci@266: // 	DfsIterator5< EAugGraph/*, EAugOutEdgeIt*/, BlockingReachedMap > 
marci@266: // 	  dfs(res_graph);
marci@266: // 	typename EAugGraph::NodeMap<EAugEdge> pred(res_graph); 
marci@266: // 	pred.set(s, EAugEdge(INVALID));
marci@266: // 	//invalid iterators for sources
marci@266: 
marci@266: // 	typename EAugGraph::NodeMap<Number> free(res_graph);
marci@266: 
marci@266: // 	dfs.pushAndSetReached(s);
marci@266: // 	while (!dfs.finished()) {
marci@266: // 	  ++dfs;
marci@266: // 	  if (res_graph.valid(EAugOutEdgeIt(dfs))) { 
marci@266: // 	    if (dfs.isBNodeNewlyReached()) {
marci@266: 	  
marci@266: // 	      typename EAugGraph::Node v=res_graph.aNode(dfs);
marci@266: // 	      typename EAugGraph::Node w=res_graph.bNode(dfs);
marci@266: 
marci@266: // 	      pred.set(w, EAugOutEdgeIt(dfs));
marci@266: // 	      if (res_graph.valid(pred.get(v))) {
marci@266: // 		free.set(w, std::min(free.get(v), res_graph.free(dfs)));
marci@266: // 	      } else {
marci@266: // 		free.set(w, res_graph.free(dfs)); 
marci@266: // 	      }
marci@266: 	      
marci@266: // 	      if (w==t) { 
marci@266: // 		__augment=true; 
marci@266: // 		_augment=true;
marci@266: // 		break; 
marci@266: // 	      }
marci@266: // 	    } else {
marci@266: // 	      res_graph.erase(dfs);
marci@266: // 	    }
marci@266: // 	  } 
marci@266: 
marci@266: // 	}
marci@266: 
marci@266: // 	if (__augment) {
marci@266: // 	  typename EAugGraph::Node n=t;
marci@266: // 	  Number augment_value=free.get(t);
marci@266: // 	  while (res_graph.valid(pred.get(n))) { 
marci@266: // 	    EAugEdge e=pred.get(n);
marci@266: // 	    res_graph.augment(e, augment_value);
marci@266: // 	    n=res_graph.tail(e);
marci@266: // 	    if (res_graph.free(e)==0)
marci@266: // 	      res_graph.erase(e);
marci@266: // 	  }
marci@266: // 	}
marci@193:       
marci@266: //       }
marci@193:             
marci@266: //       return _augment;
marci@266: //     }
marci@269: 
marci@269:     void run() {
marci@269:       //int num_of_augmentations=0;
marci@269:       while (augmentOnShortestPath()) { 
marci@269: 	//while (augmentOnBlockingFlow<MutableGraph>()) { 
marci@269: 	//std::cout << ++num_of_augmentations << " ";
marci@269: 	//std::cout<<std::endl;
marci@269:       } 
marci@269:     }
marci@269: 
marci@269:     template<typename MutableGraph> void run() {
marci@269:       //int num_of_augmentations=0;
marci@269:       //while (augmentOnShortestPath()) { 
marci@269: 	while (augmentOnBlockingFlow<MutableGraph>()) { 
marci@269: 	//std::cout << ++num_of_augmentations << " ";
marci@269: 	//std::cout<<std::endl;
marci@269:       } 
marci@269:     }
marci@269: 
marci@193:     Number flowValue() { 
marci@193:       Number a=0;
marci@266:       OutEdgeIt e;
marci@266:       for(gw.first(e, s); gw.valid(e); gw.next(e)) {
marci@193: 	a+=flow->get(e);
marci@193:       }
marci@193:       return a;
marci@193:     }
marci@269: 
marci@193:   };
marci@193: 
marci@193: 
marci@174: //   template <typename Graph, typename Number, typename FlowMap, typename CapacityMap>
marci@266: //   class MaxMatching {
marci@174: //   public:
marci@174: //     typedef typename Graph::Node Node;
marci@266: //     typedef typename Graph::NodeIt NodeIt;
marci@174: //     typedef typename Graph::Edge Edge;
marci@174: //     typedef typename Graph::EdgeIt EdgeIt;
marci@174: //     typedef typename Graph::OutEdgeIt OutEdgeIt;
marci@174: //     typedef typename Graph::InEdgeIt InEdgeIt;
marci@266: 
marci@266: //     typedef typename Graph::NodeMap<bool> SMap;
marci@266: //     typedef typename Graph::NodeMap<bool> TMap;
marci@174: //   private:
marci@266: //     const Graph* G;
marci@266: //     SMap* S;
marci@266: //     TMap* T;
marci@266: //     //Node s;
marci@266: //     //Node t;
marci@266: //     FlowMap* flow;
marci@266: //     const CapacityMap* capacity;
marci@174: //     typedef ResGraphWrapper<Graph, Number, FlowMap, CapacityMap > AugGraph;
marci@174: //     typedef typename AugGraph::OutEdgeIt AugOutEdgeIt;
marci@174: //     typedef typename AugGraph::Edge AugEdge;
marci@266: //     typename Graph::NodeMap<int> used; //0
marci@266: 
marci@174: //   public:
marci@266: //     MaxMatching(const Graph& _G, SMap& _S, TMap& _T, FlowMap& _flow, const CapacityMap& _capacity) : 
marci@266: //       G(&_G), S(&_S), T(&_T), flow(&_flow), capacity(&_capacity), used(_G) { }
marci@266: //     bool augmentOnShortestPath() {
marci@266: //       AugGraph res_graph(*G, *flow, *capacity);
marci@174: //       bool _augment=false;
marci@174:       
marci@174: //       typedef typename AugGraph::NodeMap<bool> ReachedMap;
marci@269: //       BfsIterator5< AugGraph, /*AugOutEdgeIt,*/ ReachedMap > bfs(res_graph);
marci@266: //       typename AugGraph::NodeMap<AugEdge> pred(res_graph); 
marci@266: //       for(NodeIt s=G->template first<NodeIt>(); G->valid(s); G->next(s)) {
marci@266: // 	if ((S->get(s)) && (used.get(s)<1) ) {
marci@266: // 	  //Number u=0;
marci@266: // 	  //for(OutEdgeIt e=G->template first<OutEdgeIt>(s); G->valid(e); G->next(e))
marci@266: // 	  //u+=flow->get(e);
marci@266: // 	  //if (u<1) {
marci@269: // 	    bfs.pushAndSetReached(s);
marci@266: // 	    pred.set(s, AugEdge(INVALID));
marci@266: // 	    //}
marci@266: // 	}
marci@174: //       }
marci@174:       
marci@174: //       typename AugGraph::NodeMap<Number> free(res_graph);
marci@174: 	
marci@266: //       Node n;
marci@174: //       //searching for augmenting path
marci@269: //       while ( !bfs.finished() ) { 
marci@269: // 	AugOutEdgeIt e=bfs;
marci@269: // 	if (res_graph.valid(e) && bfs.isBNodeNewlyReached()) {
marci@174: // 	  Node v=res_graph.tail(e);
marci@174: // 	  Node w=res_graph.head(e);
marci@174: // 	  pred.set(w, e);
marci@266: // 	  if (res_graph.valid(pred.get(v))) {
marci@266: // 	    free.set(w, std::min(free.get(v), res_graph.free(e)));
marci@174: // 	  } else {
marci@266: // 	    free.set(w, res_graph.free(e)); 
marci@174: // 	  }
marci@266: // 	  n=res_graph.head(e);
marci@266: // 	  if (T->get(n) && (used.get(n)<1) ) { 
marci@266: // 	    //Number u=0;
marci@266: // 	    //for(InEdgeIt f=G->template first<InEdgeIt>(n); G->valid(f); G->next(f))
marci@266: // 	    //u+=flow->get(f);
marci@266: // 	    //if (u<1) {
marci@266: // 	      _augment=true; 
marci@266: // 	      break; 
marci@266: // 	      //}
marci@174: // 	  }
marci@174: // 	}
marci@174: 	
marci@269: // 	++bfs;
marci@174: //       } //end of searching augmenting path
marci@174: 
marci@174: //       if (_augment) {
marci@266: // 	//Node n=t;
marci@266: // 	used.set(n, 1); //mind2 vegen jav
marci@266: // 	Number augment_value=free.get(n);
marci@266: // 	while (res_graph.valid(pred.get(n))) { 
marci@174: // 	  AugEdge e=pred.get(n);
marci@266: // 	  res_graph.augment(e, augment_value); 
marci@174: // 	  n=res_graph.tail(e);
marci@174: // 	}
marci@266: // 	used.set(n, 1); //mind2 vegen jav
marci@174: //       }
marci@174: 
marci@174: //       return _augment;
marci@174: //     }
marci@266: 
marci@266: // //     template<typename MutableGraph> bool augmentOnBlockingFlow() {      
marci@266: // //       bool _augment=false;
marci@266: 
marci@266: // //       AugGraph res_graph(*G, *flow, *capacity);
marci@266: 
marci@266: // //       typedef typename AugGraph::NodeMap<bool> ReachedMap;
marci@266: // //       BfsIterator4< AugGraph, AugOutEdgeIt, ReachedMap > bfs(res_graph);
marci@266: 
marci@266: 
marci@266: 
marci@266: 
marci@266: 
marci@266: // //       //typename AugGraph::NodeMap<AugEdge> pred(res_graph); 
marci@266: // //       for(NodeIt s=G->template first<NodeIt>(); G->valid(s); G->next(s)) {
marci@266: // // 	if (S->get(s)) {
marci@266: // // 	  Number u=0;
marci@266: // // 	  for(OutEdgeIt e=G->template first<OutEdgeIt>(s); G->valid(e); G->next(e))
marci@266: // // 	    u+=flow->get(e);
marci@266: // // 	  if (u<1) {
marci@269: // // 	    bfs.pushAndSetReached(s);
marci@266: // // 	    //pred.set(s, AugEdge(INVALID));
marci@266: // // 	  }
marci@266: // // 	}
marci@266: // //       }
marci@266: 
marci@266: 
marci@266: 
marci@266: 
marci@266: // //       //bfs.pushAndSetReached(s);
marci@266: // //       typename AugGraph::NodeMap<int> dist(res_graph); //filled up with 0's
marci@266: // //       while ( !bfs.finished() ) { 
marci@266: // // 	AugOutEdgeIt e=bfs;
marci@266: // // 	if (res_graph.valid(e) && bfs.isBNodeNewlyReached()) {
marci@266: // // 	  dist.set(res_graph.head(e), dist.get(res_graph.tail(e))+1);
marci@266: // // 	}
marci@266: 	
marci@266: // // 	++bfs;
marci@266: // //       } //computing distances from s in the residual graph
marci@266: 
marci@266: // //       MutableGraph F;
marci@266: // //       typename AugGraph::NodeMap<typename MutableGraph::Node> 
marci@266: // // 	res_graph_to_F(res_graph);
marci@266: // //       for(typename AugGraph::NodeIt n=res_graph.template first<typename AugGraph::NodeIt>(); res_graph.valid(n); res_graph.next(n)) {
marci@266: // // 	res_graph_to_F.set(n, F.addNode());
marci@266: // //       }
marci@266:       
marci@266: // //       typename MutableGraph::Node sF=res_graph_to_F.get(s);
marci@266: // //       typename MutableGraph::Node tF=res_graph_to_F.get(t);
marci@266: 
marci@266: // //       typename MutableGraph::EdgeMap<AugEdge> original_edge(F);
marci@266: // //       typename MutableGraph::EdgeMap<Number> residual_capacity(F);
marci@266: 
marci@266: // //       //Making F to the graph containing the edges of the residual graph 
marci@266: // //       //which are in some shortest paths
marci@266: // //       for(typename AugGraph::EdgeIt e=res_graph.template first<typename AugGraph::EdgeIt>(); res_graph.valid(e); res_graph.next(e)) {
marci@266: // // 	if (dist.get(res_graph.head(e))==dist.get(res_graph.tail(e))+1) {
marci@266: // // 	  typename MutableGraph::Edge f=F.addEdge(res_graph_to_F.get(res_graph.tail(e)), res_graph_to_F.get(res_graph.head(e)));
marci@266: // // 	  original_edge.update();
marci@266: // // 	  original_edge.set(f, e);
marci@266: // // 	  residual_capacity.update();
marci@266: // // 	  residual_capacity.set(f, res_graph.free(e));
marci@266: // // 	} 
marci@266: // //       }
marci@266: 
marci@266: // //       bool __augment=true;
marci@266: 
marci@266: // //       while (__augment) {
marci@266: // // 	__augment=false;
marci@266: // // 	//computing blocking flow with dfs
marci@266: // // 	typedef typename MutableGraph::NodeMap<bool> BlockingReachedMap;
marci@266: // // 	DfsIterator4< MutableGraph, typename MutableGraph::OutEdgeIt, BlockingReachedMap > dfs(F);
marci@266: // // 	typename MutableGraph::NodeMap<typename MutableGraph::Edge> pred(F);
marci@266: // // 	pred.set(sF, typename MutableGraph::Edge(INVALID));
marci@266: // // 	//invalid iterators for sources
marci@266: 
marci@266: // // 	typename MutableGraph::NodeMap<Number> free(F);
marci@266: 
marci@266: // // 	dfs.pushAndSetReached(sF);      
marci@266: // // 	while (!dfs.finished()) {
marci@266: // // 	  ++dfs;
marci@266: // // 	  if (F.valid(typename MutableGraph::OutEdgeIt(dfs))) {
marci@266: // // 	    if (dfs.isBNodeNewlyReached()) {
marci@266: // // 	      typename MutableGraph::Node v=F.aNode(dfs);
marci@266: // // 	      typename MutableGraph::Node w=F.bNode(dfs);
marci@266: // // 	      pred.set(w, dfs);
marci@266: // // 	      if (F.valid(pred.get(v))) {
marci@266: // // 		free.set(w, std::min(free.get(v), residual_capacity.get(dfs)));
marci@266: // // 	      } else {
marci@266: // // 		free.set(w, residual_capacity.get(dfs)); 
marci@266: // // 	      }
marci@266: // // 	      if (w==tF) { 
marci@266: // // 		__augment=true; 
marci@266: // // 		_augment=true;
marci@266: // // 		break; 
marci@266: // // 	      }
marci@266: 	      
marci@266: // // 	    } else {
marci@266: // // 	      F.erase(typename MutableGraph::OutEdgeIt(dfs));
marci@266: // // 	    }
marci@266: // // 	  } 
marci@266: // // 	}
marci@266: 
marci@266: // // 	if (__augment) {
marci@266: // // 	  typename MutableGraph::Node n=tF;
marci@266: // // 	  Number augment_value=free.get(tF);
marci@266: // // 	  while (F.valid(pred.get(n))) { 
marci@266: // // 	    typename MutableGraph::Edge e=pred.get(n);
marci@266: // // 	    res_graph.augment(original_edge.get(e), augment_value); 
marci@266: // // 	    n=F.tail(e);
marci@266: // // 	    if (residual_capacity.get(e)==augment_value) 
marci@266: // // 	      F.erase(e); 
marci@266: // // 	    else 
marci@266: // // 	      residual_capacity.set(e, residual_capacity.get(e)-augment_value);
marci@266: // // 	  }
marci@266: // // 	}
marci@266: 	
marci@266: // //       }
marci@266:             
marci@266: // //       return _augment;
marci@266: // //     }
marci@266: //     bool augmentOnBlockingFlow2() {
marci@266: //       bool _augment=false;
marci@266: 
marci@266: //       //typedef ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap> EAugGraph;
marci@266: //       typedef FilterGraphWrapper< ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap> > EAugGraph;
marci@266: //       typedef typename EAugGraph::OutEdgeIt EAugOutEdgeIt;
marci@266: //       typedef typename EAugGraph::Edge EAugEdge;
marci@266: 
marci@266: //       EAugGraph res_graph(*G, *flow, *capacity);
marci@266: 
marci@266: //       //typedef typename EAugGraph::NodeMap<bool> ReachedMap;
marci@266: //       BfsIterator5< 
marci@266: // 	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>, 
marci@266: // 	/*typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::OutEdgeIt,*/ 
marci@266: // 	ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::NodeMap<bool> > bfs(res_graph);
marci@266: 
marci@266: 
marci@266: //       //typename AugGraph::NodeMap<AugEdge> pred(res_graph); 
marci@266: //       for(NodeIt s=G->template first<NodeIt>(); G->valid(s); G->next(s)) {
marci@266: // 	if (S->get(s)) {
marci@266: // 	  Number u=0;
marci@266: // 	  for(OutEdgeIt e=G->template first<OutEdgeIt>(s); G->valid(e); G->next(e))
marci@266: // 	    u+=flow->get(e);
marci@266: // 	  if (u<1) {
marci@266: // 	    bfs.pushAndSetReached(s);
marci@266: // 	    //pred.set(s, AugEdge(INVALID));
marci@266: // 	  }
marci@266: // 	}
marci@266: //       }
marci@266: 
marci@266:       
marci@266: //       //bfs.pushAndSetReached(s);
marci@266: 
marci@266: //       typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::
marci@266: // 	NodeMap<int>& dist=res_graph.dist;
marci@266: 
marci@266: //       while ( !bfs.finished() ) {
marci@266: // 	typename ErasingResGraphWrapper<Graph, Number, FlowMap, CapacityMap>::OutEdgeIt e=bfs;
marci@266: // 	if (res_graph.valid(e) && bfs.isBNodeNewlyReached()) {
marci@266: // 	  dist.set(res_graph.head(e), dist.get(res_graph.tail(e))+1);
marci@266: // 	}
marci@266: // 	++bfs;	
marci@266: //       } //computing distances from s in the residual graph
marci@266: 
marci@266: //       bool __augment=true;
marci@266: 
marci@266: //       while (__augment) {
marci@266: 
marci@266: // 	__augment=false;
marci@266: // 	//computing blocking flow with dfs
marci@266: // 	typedef typename EAugGraph::NodeMap<bool> BlockingReachedMap;
marci@266: // 	DfsIterator5< EAugGraph/*, EAugOutEdgeIt*/, BlockingReachedMap > 
marci@266: // 	  dfs(res_graph);
marci@266: // 	typename EAugGraph::NodeMap<EAugEdge> pred(res_graph, INVALID); 
marci@266: // 	//pred.set(s, EAugEdge(INVALID));
marci@266: // 	//invalid iterators for sources
marci@266: 
marci@266: // 	typename EAugGraph::NodeMap<Number> free(res_graph);
marci@266: 
marci@266: 
marci@266: // 	//typename AugGraph::NodeMap<AugEdge> pred(res_graph); 
marci@266: //       for(NodeIt s=G->template first<NodeIt>(); G->valid(s); G->next(s)) {
marci@266: // 	if (S->get(s)) {
marci@266: // 	  Number u=0;
marci@266: // 	  for(OutEdgeIt e=G->template first<OutEdgeIt>(s); G->valid(e); G->next(e))
marci@266: // 	    u+=flow->get(e);
marci@266: // 	  if (u<1) {
marci@266: // 	    dfs.pushAndSetReached(s);
marci@266: // 	    //pred.set(s, AugEdge(INVALID));
marci@266: // 	  }
marci@266: // 	}
marci@266: //       }
marci@266: 
marci@266: 
marci@266: 
marci@266: //       //dfs.pushAndSetReached(s);
marci@266: //       typename EAugGraph::Node n;
marci@266: // 	while (!dfs.finished()) {
marci@266: // 	  ++dfs;
marci@266: // 	  if (res_graph.valid(EAugOutEdgeIt(dfs))) { 
marci@266: // 	    if (dfs.isBNodeNewlyReached()) {
marci@266: 	  
marci@266: // 	      typename EAugGraph::Node v=res_graph.aNode(dfs);
marci@266: // 	      typename EAugGraph::Node w=res_graph.bNode(dfs);
marci@266: 
marci@266: // 	      pred.set(w, EAugOutEdgeIt(dfs));
marci@266: // 	      if (res_graph.valid(pred.get(v))) {
marci@266: // 		free.set(w, std::min(free.get(v), res_graph.free(dfs)));
marci@266: // 	      } else {
marci@266: // 		free.set(w, res_graph.free(dfs)); 
marci@266: // 	      }
marci@266: 	     
marci@266: // 	      n=w;
marci@266: // 	      if (T->get(w)) {
marci@266: // 		Number u=0;
marci@266: // 		for(InEdgeIt f=G->template first<InEdgeIt>(n); G->valid(f); G->next(f))
marci@266: // 		  u+=flow->get(f);
marci@266: // 		if (u<1) {
marci@266: // 		  __augment=true; 
marci@266: // 		  _augment=true;
marci@266: // 		  break; 
marci@266: // 		}
marci@266: // 	      }
marci@266: // 	    } else {
marci@266: // 	      res_graph.erase(dfs);
marci@266: // 	    }
marci@266: // 	  } 
marci@266: 
marci@266: // 	}
marci@266: 
marci@266: // 	if (__augment) {
marci@266: // 	  // typename EAugGraph::Node n=t;
marci@266: // 	  Number augment_value=free.get(n);
marci@266: // 	  while (res_graph.valid(pred.get(n))) { 
marci@266: // 	    EAugEdge e=pred.get(n);
marci@266: // 	    res_graph.augment(e, augment_value);
marci@266: // 	    n=res_graph.tail(e);
marci@266: // 	    if (res_graph.free(e)==0)
marci@266: // 	      res_graph.erase(e);
marci@266: // 	  }
marci@266: // 	}
marci@266:       
marci@266: //       }
marci@266:             
marci@266: //       return _augment;
marci@266: //     }
marci@174: //     void run() {
marci@266: //       //int num_of_augmentations=0;
marci@266: //       while (augmentOnShortestPath()) { 
marci@266: // 	//while (augmentOnBlockingFlow<MutableGraph>()) { 
marci@266: // 	//std::cout << ++num_of_augmentations << " ";
marci@266: // 	//std::cout<<std::endl;
marci@266: //       } 
marci@174: //     }
marci@266: // //     template<typename MutableGraph> void run() {
marci@266: // //       //int num_of_augmentations=0;
marci@266: // //       //while (augmentOnShortestPath()) { 
marci@266: // // 	while (augmentOnBlockingFlow<MutableGraph>()) { 
marci@266: // // 	//std::cout << ++num_of_augmentations << " ";
marci@266: // // 	//std::cout<<std::endl;
marci@266: // //       } 
marci@266: // //     } 
marci@174: //     Number flowValue() { 
marci@174: //       Number a=0;
marci@266: //       EdgeIt e;
marci@266: //       for(G->/*getF*/first(e); G->valid(e); G->next(e)) {
marci@266: // 	a+=flow->get(e);
marci@174: //       }
marci@174: //       return a;
marci@174: //     }
marci@174: //   };
marci@174: 
marci@174: 
marci@174: 
marci@266: 
marci@266: 
marci@266:   
marci@266: // //   template <typename Graph, typename Number, typename FlowMap, typename CapacityMap>
marci@266: // //   class MaxFlow2 {
marci@266: // //   public:
marci@266: // //     typedef typename Graph::Node Node;
marci@266: // //     typedef typename Graph::Edge Edge;
marci@266: // //     typedef typename Graph::EdgeIt EdgeIt;
marci@266: // //     typedef typename Graph::OutEdgeIt OutEdgeIt;
marci@266: // //     typedef typename Graph::InEdgeIt InEdgeIt;
marci@266: // //   private:
marci@266: // //     const Graph& G;
marci@266: // //     std::list<Node>& S;
marci@266: // //     std::list<Node>& T;
marci@266: // //     FlowMap& flow;
marci@266: // //     const CapacityMap& capacity;
marci@266: // //     typedef ResGraphWrapper<Graph, Number, FlowMap, CapacityMap > AugGraph;
marci@266: // //     typedef typename AugGraph::OutEdgeIt AugOutEdgeIt;
marci@266: // //     typedef typename AugGraph::Edge AugEdge;
marci@266: // //     typename Graph::NodeMap<bool> SMap;
marci@266: // //     typename Graph::NodeMap<bool> TMap;
marci@266: // //   public:
marci@266: // //     MaxFlow2(const Graph& _G, std::list<Node>& _S, std::list<Node>& _T, FlowMap& _flow, const CapacityMap& _capacity) : G(_G), S(_S), T(_T), flow(_flow), capacity(_capacity), SMap(_G), TMap(_G) { 
marci@266: // //       for(typename std::list<Node>::const_iterator i=S.begin(); 
marci@266: // // 	  i!=S.end(); ++i) { 
marci@266: // // 	SMap.set(*i, true); 
marci@266: // //       }
marci@266: // //       for (typename std::list<Node>::const_iterator i=T.begin(); 
marci@266: // // 	   i!=T.end(); ++i) { 
marci@266: // // 	TMap.set(*i, true); 
marci@266: // //       }
marci@266: // //     }
marci@266: // //     bool augment() {
marci@266: // //       AugGraph res_graph(G, flow, capacity);
marci@266: // //       bool _augment=false;
marci@266: // //       Node reached_t_node;
marci@266:       
marci@266: // //       typedef typename AugGraph::NodeMap<bool> ReachedMap;
marci@269: // //       BfsIterator4< AugGraph, AugOutEdgeIt, ReachedMap > bfs(res_graph);
marci@266: // //       for(typename std::list<Node>::const_iterator i=S.begin(); 
marci@266: // // 	  i!=S.end(); ++i) {
marci@269: // // 	bfs.pushAndSetReached(*i);
marci@266: // //       }
marci@269: // //       //bfs.pushAndSetReached(s);
marci@266: 	
marci@266: // //       typename AugGraph::NodeMap<AugEdge> pred(res_graph); 
marci@266: // //       //filled up with invalid iterators
marci@266:       
marci@266: // //       typename AugGraph::NodeMap<Number> free(res_graph);
marci@266: 	
marci@266: // //       //searching for augmenting path
marci@269: // //       while ( !bfs.finished() ) { 
marci@269: // // 	AugOutEdgeIt e=/*AugOutEdgeIt*/(bfs);
marci@269: // // 	if (e.valid() && bfs.isBNodeNewlyReached()) {
marci@266: // // 	  Node v=res_graph.tail(e);
marci@266: // // 	  Node w=res_graph.head(e);
marci@266: // // 	  pred.set(w, e);
marci@266: // // 	  if (pred.get(v).valid()) {
marci@266: // // 	    free.set(w, std::min(free.get(v), e.free()));
marci@266: // // 	  } else {
marci@266: // // 	    free.set(w, e.free()); 
marci@266: // // 	  }
marci@266: // // 	  if (TMap.get(res_graph.head(e))) { 
marci@266: // // 	    _augment=true; 
marci@266: // // 	    reached_t_node=res_graph.head(e);
marci@266: // // 	    break; 
marci@266: // // 	  }
marci@266: // // 	}
marci@266: 	
marci@269: // // 	++bfs;
marci@266: // //       } //end of searching augmenting path
marci@266: 
marci@266: // //       if (_augment) {
marci@266: // // 	Node n=reached_t_node;
marci@266: // // 	Number augment_value=free.get(reached_t_node);
marci@266: // // 	while (pred.get(n).valid()) { 
marci@266: // // 	  AugEdge e=pred.get(n);
marci@266: // // 	  e.augment(augment_value); 
marci@266: // // 	  n=res_graph.tail(e);
marci@266: // // 	}
marci@266: // //       }
marci@266: 
marci@266: // //       return _augment;
marci@266: // //     }
marci@266: // //     void run() {
marci@266: // //       while (augment()) { } 
marci@266: // //     }
marci@266: // //     Number flowValue() { 
marci@266: // //       Number a=0;
marci@266: // //       for(typename std::list<Node>::const_iterator i=S.begin(); 
marci@266: // // 	  i!=S.end(); ++i) { 
marci@266: // // 	for(OutEdgeIt e=G.template first<OutEdgeIt>(*i); e.valid(); ++e) {
marci@266: // // 	  a+=flow.get(e);
marci@266: // // 	}
marci@266: // // 	for(InEdgeIt e=G.template first<InEdgeIt>(*i); e.valid(); ++e) {
marci@266: // // 	  a-=flow.get(e);
marci@266: // // 	}
marci@266: // //       }
marci@266: // //       return a;
marci@266: // //     }
marci@266: // //   };
marci@266: 
marci@266: 
marci@174: } // namespace hugo
marci@174: 
marci@259: #endif //HUGO_EDMONDS_KARP_H