# HG changeset patch
# User Antal Nemes <thoneyvazul@gmail.com>
# Date 2010-11-15 22:23:35
# Node ID 70bee017b584c6c4e3dd4013e37a4d875dbbe0f0
# Parent  1937b6455b7d0cff4f1e21bdd7c5a66b4c1af1cf

Port max. card. search alg. from svn -r3512 (#397) and (#56)

diff --git a/lemon/Makefile.am b/lemon/Makefile.am
--- a/lemon/Makefile.am
+++ b/lemon/Makefile.am
@@ -107,6 +107,7 @@
 	lemon/matching.h \
 	lemon/math.h \
 	lemon/min_cost_arborescence.h \
+	lemon/max_cardinality_search.h \
 	lemon/nauty_reader.h \
 	lemon/network_simplex.h \
 	lemon/pairing_heap.h \
diff --git a/lemon/max_cardinality_search.h b/lemon/max_cardinality_search.h
new file mode 100644
--- /dev/null
+++ b/lemon/max_cardinality_search.h
@@ -0,0 +1,786 @@
+/* -*- C++ -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library
+ *
+ * Copyright (C) 2003-2010
+ * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+#ifndef LEMON_MAX_CARDINALITY_SEARCH_H
+#define LEMON_MAX_CARDINALITY_SEARCH_H
+
+
+/// \ingroup search
+/// \file 
+/// \brief Maximum cardinality search in undirected digraphs.
+
+#include <lemon/bin_heap.h>
+#include <lemon/bucket_heap.h>
+
+#include <lemon/error.h>
+#include <lemon/maps.h>
+
+#include <functional>
+
+namespace lemon {
+
+  /// \brief Default traits class of MaxCardinalitySearch class.
+  ///
+  /// Default traits class of MaxCardinalitySearch class.
+  /// \param Digraph Digraph type.
+  /// \param CapacityMap Type of capacity map.
+  template <typename GR, typename CAP>
+  struct MaxCardinalitySearchDefaultTraits {
+    /// The digraph type the algorithm runs on. 
+    typedef GR Digraph;
+
+    template <typename CM>
+    struct CapMapSelector {
+
+      typedef CM CapacityMap;
+
+      static CapacityMap *createCapacityMap(const Digraph& g) {
+	return new CapacityMap(g);
+      }
+    };
+
+    template <typename CM>
+    struct CapMapSelector<ConstMap<CM, Const<int, 1> > > {
+
+      typedef ConstMap<CM, Const<int, 1> > CapacityMap;
+
+      static CapacityMap *createCapacityMap(const Digraph&) {
+	return new CapacityMap;
+      }
+    };
+
+    /// \brief The type of the map that stores the arc capacities.
+    ///
+    /// The type of the map that stores the arc capacities.
+    /// It must meet the \ref concepts::ReadMap "ReadMap" concept.
+    typedef typename CapMapSelector<CAP>::CapacityMap CapacityMap;
+
+    /// \brief The type of the capacity of the arcs.
+    typedef typename CapacityMap::Value Value;
+
+    /// \brief Instantiates a CapacityMap.
+    ///
+    /// This function instantiates a \ref CapacityMap.
+    /// \param digraph is the digraph, to which we would like to define
+    /// the CapacityMap.
+    static CapacityMap *createCapacityMap(const Digraph& digraph) {
+      return CapMapSelector<CapacityMap>::createCapacityMap(digraph);
+    }
+
+    /// \brief The cross reference type used by heap.
+    ///
+    /// The cross reference type used by heap.
+    /// Usually it is \c Digraph::NodeMap<int>.
+    typedef typename Digraph::template NodeMap<int> HeapCrossRef;
+
+    /// \brief Instantiates a HeapCrossRef.
+    ///
+    /// This function instantiates a \ref HeapCrossRef. 
+    /// \param digraph is the digraph, to which we would like to define the 
+    /// HeapCrossRef.
+    static HeapCrossRef *createHeapCrossRef(const Digraph &digraph) {
+      return new HeapCrossRef(digraph);
+    }
+    
+    template <typename CapacityMap>
+    struct HeapSelector {
+      template <typename Value, typename Ref>
+      struct Selector { 
+        typedef BinHeap<Value, Ref, std::greater<Value> > Heap;
+      };
+    };
+
+    template <typename CapacityKey>
+    struct HeapSelector<ConstMap<CapacityKey, Const<int, 1> > > {
+      template <typename Value, typename Ref>
+      struct Selector {
+        typedef BucketHeap<Ref, false > Heap;
+      };
+    };
+
+    /// \brief The heap type used by MaxCardinalitySearch algorithm.
+    ///
+    /// The heap type used by MaxCardinalitySearch algorithm. It should
+    /// maximalize the priorities. The default heap type is
+    /// the \ref BinHeap, but it is specialized when the
+    /// CapacityMap is ConstMap<Digraph::Node, Const<int, 1> >
+    /// to BucketHeap.
+    ///
+    /// \sa MaxCardinalitySearch
+    typedef typename HeapSelector<CapacityMap>
+    ::template Selector<Value, HeapCrossRef>
+    ::Heap Heap;
+
+    /// \brief Instantiates a Heap.
+    ///
+    /// This function instantiates a \ref Heap. 
+    /// \param crossref The cross reference of the heap.
+    static Heap *createHeap(HeapCrossRef& crossref) {
+      return new Heap(crossref);
+    }
+
+    /// \brief The type of the map that stores whether a node is processed.
+    ///
+    /// The type of the map that stores whether a node is processed.
+    /// It must meet the \ref concepts::WriteMap "WriteMap" concept.
+    /// By default it is a NullMap.
+    typedef NullMap<typename Digraph::Node, bool> ProcessedMap;
+
+    /// \brief Instantiates a ProcessedMap.
+    ///
+    /// This function instantiates a \ref ProcessedMap. 
+    /// \param digraph is the digraph, to which
+    /// we would like to define the \ref ProcessedMap
+#ifdef DOXYGEN
+    static ProcessedMap *createProcessedMap(const Digraph &digraph)
+#else
+    static ProcessedMap *createProcessedMap(const Digraph &)
+#endif
+    {
+      return new ProcessedMap();
+    }
+
+    /// \brief The type of the map that stores the cardinalities of the nodes.
+    /// 
+    /// The type of the map that stores the cardinalities of the nodes.
+    /// It must meet the \ref concepts::WriteMap "WriteMap" concept.
+    typedef typename Digraph::template NodeMap<Value> CardinalityMap;
+
+    /// \brief Instantiates a CardinalityMap.
+    ///
+    /// This function instantiates a \ref CardinalityMap. 
+    /// \param digraph is the digraph, to which we would like to define the \ref 
+    /// CardinalityMap
+    static CardinalityMap *createCardinalityMap(const Digraph &digraph) {
+      return new CardinalityMap(digraph);
+    }
+
+
+  };
+  
+  /// \ingroup search
+  ///
+  /// \brief Maximum Cardinality Search algorithm class.
+  ///
+  /// This class provides an efficient implementation of Maximum Cardinality 
+  /// Search algorithm. The maximum cardinality search first chooses any 
+  /// node of the digraph. Then every time it chooses one unprocessed node
+  /// with maximum cardinality, i.e the sum of capacities on out arcs to the nodes
+  /// which were previusly processed.
+  /// If there is a cut in the digraph the algorithm should choose
+  /// again any unprocessed node of the digraph.
+
+  /// The arc capacities are passed to the algorithm using a
+  /// \ref concepts::ReadMap "ReadMap", so it is easy to change it to any 
+  /// kind of capacity.
+  ///
+  /// The type of the capacity is determined by the \ref 
+  /// concepts::ReadMap::Value "Value" of the capacity map.
+  ///
+  /// It is also possible to change the underlying priority heap.
+  ///
+  ///
+  /// \param GR The digraph type the algorithm runs on. The value of
+  /// Digraph is not used directly by the search algorithm, it 
+  /// is only passed to \ref MaxCardinalitySearchDefaultTraits.
+  /// \param CAP This read-only ArcMap determines the capacities of 
+  /// the arcs. It is read once for each arc, so the map may involve in
+  /// relatively time consuming process to compute the arc capacity if
+  /// it is necessary. The default map type is \ref
+  /// ConstMap "ConstMap<concepts::Digraph::Arc, Const<int,1> >". The value
+  /// of CapacityMap is not used directly by search algorithm, it is only 
+  /// passed to \ref MaxCardinalitySearchDefaultTraits.  
+  /// \param TR Traits class to set various data types used by the 
+  /// algorithm.  The default traits class is 
+  /// \ref MaxCardinalitySearchDefaultTraits 
+  /// "MaxCardinalitySearchDefaultTraits<GR, CAP>".  
+  /// See \ref MaxCardinalitySearchDefaultTraits 
+  /// for the documentation of a MaxCardinalitySearch traits class.
+
+#ifdef DOXYGEN
+  template <typename GR, typename CAP, typename TR>
+#else
+  template <typename GR, typename CAP = 
+	    ConstMap<typename GR::Arc, Const<int,1> >,
+	    typename TR = 
+            MaxCardinalitySearchDefaultTraits<GR, CAP> >
+#endif
+  class MaxCardinalitySearch {
+  public:
+
+    typedef TR Traits;
+    ///The type of the underlying digraph.
+    typedef typename Traits::Digraph Digraph;
+    
+    ///The type of the capacity of the arcs.
+    typedef typename Traits::CapacityMap::Value Value;
+    ///The type of the map that stores the arc capacities.
+    typedef typename Traits::CapacityMap CapacityMap;
+    ///The type of the map indicating if a node is processed.
+    typedef typename Traits::ProcessedMap ProcessedMap;
+    ///The type of the map that stores the cardinalities of the nodes.
+    typedef typename Traits::CardinalityMap CardinalityMap;
+    ///The cross reference type used for the current heap.
+    typedef typename Traits::HeapCrossRef HeapCrossRef;
+    ///The heap type used by the algorithm. It maximizes the priorities.
+    typedef typename Traits::Heap Heap;
+  private:
+    // Pointer to the underlying digraph.
+    const Digraph *_graph;
+    // Pointer to the capacity map
+    const CapacityMap *_capacity;
+    // Indicates if \ref _capacity is locally allocated (\c true) or not.
+    bool local_capacity;
+    // Pointer to the map of cardinality.
+    CardinalityMap *_cardinality;
+    // Indicates if \ref _cardinality is locally allocated (\c true) or not.
+    bool local_cardinality;
+    // Pointer to the map of processed status of the nodes.
+    ProcessedMap *_processed;
+    // Indicates if \ref _processed is locally allocated (\c true) or not.
+    bool local_processed;
+    // Pointer to the heap cross references.
+    HeapCrossRef *_heap_cross_ref;
+    // Indicates if \ref _heap_cross_ref is locally allocated (\c true) or not.
+    bool local_heap_cross_ref;
+    // Pointer to the heap.
+    Heap *_heap;
+    // Indicates if \ref _heap is locally allocated (\c true) or not.
+    bool local_heap;
+
+  public :
+
+    typedef MaxCardinalitySearch Create;
+ 
+    ///\name Named template parameters
+
+    ///@{
+
+    template <class T>
+    struct DefCapacityMapTraits : public Traits {
+      typedef T CapacityMap;
+      static CapacityMap *createCapacityMap(const Digraph &) {
+       	LEMON_ASSERT(false,"Uninitialized parameter.");
+	return 0;
+      }
+    };
+    /// \brief \ref named-templ-param "Named parameter" for setting 
+    /// CapacityMap type
+    ///
+    /// \ref named-templ-param "Named parameter" for setting CapacityMap type
+    /// for the algorithm.
+    template <class T>
+    struct SetCapacityMap 
+      : public MaxCardinalitySearch<Digraph, CapacityMap, 
+                                    DefCapacityMapTraits<T> > { 
+      typedef MaxCardinalitySearch<Digraph, CapacityMap, 
+                                   DefCapacityMapTraits<T> > Create;
+    };
+
+    template <class T>
+    struct DefCardinalityMapTraits : public Traits {
+      typedef T CardinalityMap;
+      static CardinalityMap *createCardinalityMap(const Digraph &) 
+      {
+	LEMON_ASSERT(false,"Uninitialized parameter.");
+	return 0;
+      }
+    };
+    /// \brief \ref named-templ-param "Named parameter" for setting 
+    /// CardinalityMap type
+    ///
+    /// \ref named-templ-param "Named parameter" for setting CardinalityMap 
+    /// type for the algorithm.
+    template <class T>
+    struct SetCardinalityMap 
+      : public MaxCardinalitySearch<Digraph, CapacityMap, 
+                                    DefCardinalityMapTraits<T> > { 
+      typedef MaxCardinalitySearch<Digraph, CapacityMap, 
+                                   DefCardinalityMapTraits<T> > Create;
+    };
+    
+    template <class T>
+    struct DefProcessedMapTraits : public Traits {
+      typedef T ProcessedMap;
+      static ProcessedMap *createProcessedMap(const Digraph &) {
+       	LEMON_ASSERT(false,"Uninitialized parameter.");
+	return 0;
+      }
+    };
+    /// \brief \ref named-templ-param "Named parameter" for setting 
+    /// ProcessedMap type
+    ///
+    /// \ref named-templ-param "Named parameter" for setting ProcessedMap type
+    /// for the algorithm.
+    template <class T>
+    struct SetProcessedMap 
+      : public MaxCardinalitySearch<Digraph, CapacityMap, 
+                                    DefProcessedMapTraits<T> > { 
+      typedef MaxCardinalitySearch<Digraph, CapacityMap, 
+                                   DefProcessedMapTraits<T> > Create;
+    };
+    
+    template <class H, class CR>
+    struct DefHeapTraits : public Traits {
+      typedef CR HeapCrossRef;
+      typedef H Heap;
+      static HeapCrossRef *createHeapCrossRef(const Digraph &) {
+     	LEMON_ASSERT(false,"Uninitialized parameter.");
+	return 0;
+      }
+      static Heap *createHeap(HeapCrossRef &) {
+       	LEMON_ASSERT(false,"Uninitialized parameter.");
+	return 0;
+      }
+    };
+    /// \brief \ref named-templ-param "Named parameter" for setting heap 
+    /// and cross reference type
+    ///
+    /// \ref named-templ-param "Named parameter" for setting heap and cross 
+    /// reference type for the algorithm.
+    template <class H, class CR = typename Digraph::template NodeMap<int> >
+    struct SetHeap
+      : public MaxCardinalitySearch<Digraph, CapacityMap, 
+                                    DefHeapTraits<H, CR> > { 
+      typedef MaxCardinalitySearch< Digraph, CapacityMap, 
+                                    DefHeapTraits<H, CR> > Create;
+    };
+
+    template <class H, class CR>
+    struct DefStandardHeapTraits : public Traits {
+      typedef CR HeapCrossRef;
+      typedef H Heap;
+      static HeapCrossRef *createHeapCrossRef(const Digraph &digraph) {
+	return new HeapCrossRef(digraph);
+      }
+      static Heap *createHeap(HeapCrossRef &crossref) {
+	return new Heap(crossref);
+      }
+    };
+
+    /// \brief \ref named-templ-param "Named parameter" for setting heap and 
+    /// cross reference type with automatic allocation
+    ///
+    /// \ref named-templ-param "Named parameter" for setting heap and cross 
+    /// reference type. It can allocate the heap and the cross reference 
+    /// object if the cross reference's constructor waits for the digraph as 
+    /// parameter and the heap's constructor waits for the cross reference.
+    template <class H, class CR = typename Digraph::template NodeMap<int> >
+    struct SetStandardHeap
+      : public MaxCardinalitySearch<Digraph, CapacityMap, 
+                                    DefStandardHeapTraits<H, CR> > { 
+      typedef MaxCardinalitySearch<Digraph, CapacityMap, 
+                                   DefStandardHeapTraits<H, CR> > 
+      Create;
+    };
+    
+    ///@}
+
+
+  protected:
+
+    MaxCardinalitySearch() {}
+
+  public:      
+    
+    /// \brief Constructor.
+    ///
+    ///\param digraph the digraph the algorithm will run on.
+    ///\param capacity the capacity map used by the algorithm.
+    ///When no capacity map given, a constant 1 capacity map will
+    ///be allocated.
+#ifdef DOXYGEN
+    MaxCardinalitySearch(const Digraph& digraph,
+			 const CapacityMap& capacity=0 ) :
+#else
+    MaxCardinalitySearch(const Digraph& digraph,
+			 const CapacityMap& capacity=*static_cast<const CapacityMap*>(0) ) :
+#endif
+      _graph(&digraph),
+      _capacity(&capacity), local_capacity(false),
+      _cardinality(0), local_cardinality(false),
+      _processed(0), local_processed(false),
+      _heap_cross_ref(0), local_heap_cross_ref(false),
+      _heap(0), local_heap(false)
+    { }
+
+    /// \brief Destructor.
+    ~MaxCardinalitySearch() {
+      if(local_capacity) delete _capacity;
+      if(local_cardinality) delete _cardinality;
+      if(local_processed) delete _processed;
+      if(local_heap_cross_ref) delete _heap_cross_ref;
+      if(local_heap) delete _heap;
+    }
+
+    /// \brief Sets the capacity map.
+    ///
+    /// Sets the capacity map.
+    /// \return <tt> (*this) </tt>
+    MaxCardinalitySearch &capacityMap(const CapacityMap &m) {
+      if (local_capacity) {
+	delete _capacity;
+	local_capacity=false;
+      }
+      _capacity=&m;
+      return *this;
+    }
+
+    /// \brief Returns a const reference to the capacity map.
+    ///
+    /// Returns a const reference to the capacity map used by
+    /// the algorithm.
+    const CapacityMap &capacityMap() const {
+      return *_capacity;
+    }
+
+    /// \brief Sets the map storing the cardinalities calculated by the 
+    /// algorithm.
+    ///
+    /// Sets the map storing the cardinalities calculated by the algorithm.
+    /// If you don't use this function before calling \ref run(),
+    /// it will allocate one. The destuctor deallocates this
+    /// automatically allocated map, of course.
+    /// \return <tt> (*this) </tt>
+    MaxCardinalitySearch &cardinalityMap(CardinalityMap &m) {
+      if(local_cardinality) {
+	delete _cardinality;
+	local_cardinality=false;
+      }
+      _cardinality = &m;
+      return *this;
+    }
+
+    /// \brief Sets the map storing the processed nodes.
+    ///
+    /// Sets the map storing the processed nodes.
+    /// If you don't use this function before calling \ref run(),
+    /// it will allocate one. The destuctor deallocates this
+    /// automatically allocated map, of course.
+    /// \return <tt> (*this) </tt>
+    MaxCardinalitySearch &processedMap(ProcessedMap &m) 
+    {
+      if(local_processed) {
+	delete _processed;
+	local_processed=false;
+      }
+      _processed = &m;
+      return *this;
+    }
+
+    /// \brief Returns a const reference to the cardinality map.
+    ///
+    /// Returns a const reference to the cardinality map used by
+    /// the algorithm.
+    const ProcessedMap &processedMap() const {
+      return *_processed;
+    }
+
+    /// \brief Sets the heap and the cross reference used by algorithm.
+    ///
+    /// Sets the heap and the cross reference used by algorithm.
+    /// If you don't use this function before calling \ref run(),
+    /// it will allocate one. The destuctor deallocates this
+    /// automatically allocated map, of course.
+    /// \return <tt> (*this) </tt>
+    MaxCardinalitySearch &heap(Heap& hp, HeapCrossRef &cr) {
+      if(local_heap_cross_ref) {
+	delete _heap_cross_ref;
+	local_heap_cross_ref = false;
+      }
+      _heap_cross_ref = &cr;
+      if(local_heap) {
+	delete _heap;
+	local_heap = false;
+      }
+      _heap = &hp;
+      return *this;
+    }
+
+    /// \brief Returns a const reference to the heap.
+    ///
+    /// Returns a const reference to the heap used by
+    /// the algorithm.
+    const Heap &heap() const {
+      return *_heap;
+    }
+
+    /// \brief Returns a const reference to the cross reference.
+    ///
+    /// Returns a const reference to the cross reference
+    /// of the heap.
+    const HeapCrossRef &heapCrossRef() const {
+      return *_heap_cross_ref;
+    }
+
+  private:
+
+    typedef typename Digraph::Node Node;
+    typedef typename Digraph::NodeIt NodeIt;
+    typedef typename Digraph::Arc Arc;
+    typedef typename Digraph::InArcIt InArcIt;
+
+    void create_maps() {
+      if(!_capacity) {
+	local_capacity = true;
+	_capacity = Traits::createCapacityMap(*_graph);
+      }
+      if(!_cardinality) {
+	local_cardinality = true;
+	_cardinality = Traits::createCardinalityMap(*_graph);
+      }
+      if(!_processed) {
+	local_processed = true;
+	_processed = Traits::createProcessedMap(*_graph);
+      }
+      if (!_heap_cross_ref) {
+	local_heap_cross_ref = true;
+	_heap_cross_ref = Traits::createHeapCrossRef(*_graph);
+      }
+      if (!_heap) {
+	local_heap = true;
+	_heap = Traits::createHeap(*_heap_cross_ref);
+      }
+    }
+    
+    void finalizeNodeData(Node node, Value capacity) {
+      _processed->set(node, true);
+      _cardinality->set(node, capacity);
+    }
+
+  public:
+    /// \name Execution control
+    /// The simplest way to execute the algorithm is to use
+    /// one of the member functions called \ref run().
+    /// \n
+    /// If you need more control on the execution,
+    /// first you must call \ref init(), then you can add several source nodes
+    /// with \ref addSource().
+    /// Finally \ref start() will perform the computation.
+
+    ///@{
+
+    /// \brief Initializes the internal data structures.
+    ///
+    /// Initializes the internal data structures, and clears the heap.
+    void init() {
+      create_maps();
+      _heap->clear();
+      for (NodeIt it(*_graph) ; it != INVALID ; ++it) {
+	_processed->set(it, false);
+	_heap_cross_ref->set(it, Heap::PRE_HEAP);
+      }
+    }
+    
+    /// \brief Adds a new source node.
+    /// 
+    /// Adds a new source node to the priority heap.
+    ///
+    /// It checks if the node has not yet been added to the heap.
+    void addSource(Node source, Value capacity = 0) {
+      if(_heap->state(source) == Heap::PRE_HEAP) {
+	_heap->push(source, capacity);
+      } 
+    }
+    
+    /// \brief Processes the next node in the priority heap
+    ///
+    /// Processes the next node in the priority heap.
+    ///
+    /// \return The processed node.
+    ///
+    /// \warning The priority heap must not be empty!
+    Node processNextNode() {
+      Node node = _heap->top(); 
+      finalizeNodeData(node, _heap->prio());
+      _heap->pop();
+      
+      for (InArcIt it(*_graph, node); it != INVALID; ++it) {
+	Node source = _graph->source(it);
+	switch (_heap->state(source)) {
+	case Heap::PRE_HEAP:
+	  _heap->push(source, (*_capacity)[it]);
+	  break;
+	case Heap::IN_HEAP:
+	  _heap->decrease(source, (*_heap)[source] + (*_capacity)[it]);
+	  break;
+	case Heap::POST_HEAP:
+	  break;
+	}
+      }
+      return node;
+    }
+
+    /// \brief Next node to be processed.
+    ///
+    /// Next node to be processed.
+    ///
+    /// \return The next node to be processed or INVALID if the 
+    /// priority heap is empty.
+    Node nextNode() { 
+      return !_heap->empty() ? _heap->top() : INVALID;
+    }
+ 
+    /// \brief Returns \c false if there are nodes
+    /// to be processed in the priority heap
+    ///
+    /// Returns \c false if there are nodes
+    /// to be processed in the priority heap
+    bool emptyQueue() { return _heap->empty(); }
+    /// \brief Returns the number of the nodes to be processed 
+    /// in the priority heap
+    ///
+    /// Returns the number of the nodes to be processed in the priority heap
+    int emptySize() { return _heap->size(); }
+    
+    /// \brief Executes the algorithm.
+    ///
+    /// Executes the algorithm.
+    ///
+    ///\pre init() must be called and at least one node should be added
+    /// with addSource() before using this function.
+    ///
+    /// This method runs the Maximum Cardinality Search algorithm from the 
+    /// source node(s).
+    void start() {
+      while ( !_heap->empty() ) processNextNode();
+    }
+    
+    /// \brief Executes the algorithm until \c dest is reached.
+    ///
+    /// Executes the algorithm until \c dest is reached.
+    ///
+    /// \pre init() must be called and at least one node should be added
+    /// with addSource() before using this function.
+    ///
+    /// This method runs the %MaxCardinalitySearch algorithm from the source 
+    /// nodes.
+    void start(Node dest) {
+      while ( !_heap->empty() && _heap->top()!=dest ) processNextNode();
+      if ( !_heap->empty() ) finalizeNodeData(_heap->top(), _heap->prio());
+    }
+    
+    /// \brief Executes the algorithm until a condition is met.
+    ///
+    /// Executes the algorithm until a condition is met.
+    ///
+    /// \pre init() must be called and at least one node should be added
+    /// with addSource() before using this function.
+    ///
+    /// \param nm must be a bool (or convertible) node map. The algorithm
+    /// will stop when it reaches a node \c v with <tt>nm[v]==true</tt>.
+    template <typename NodeBoolMap>
+    void start(const NodeBoolMap &nm) {
+      while ( !_heap->empty() && !nm[_heap->top()] ) processNextNode();
+      if ( !_heap->empty() ) finalizeNodeData(_heap->top(),_heap->prio());
+    }
+    
+    /// \brief Runs the maximum cardinality search algorithm from node \c s.
+    ///
+    /// This method runs the %MaxCardinalitySearch algorithm from a root 
+    /// node \c s.
+    ///
+    ///\note d.run(s) is just a shortcut of the following code.
+    ///\code
+    ///  d.init();
+    ///  d.addSource(s);
+    ///  d.start();
+    ///\endcode
+    void run(Node s) {
+      init();
+      addSource(s);
+      start();
+    }
+
+    /// \brief Runs the maximum cardinality search algorithm for the 
+    /// whole digraph.
+    ///
+    /// This method runs the %MaxCardinalitySearch algorithm from all 
+    /// unprocessed node of the digraph.
+    ///
+    ///\note d.run(s) is just a shortcut of the following code.
+    ///\code
+    ///  d.init();
+    ///  for (NodeIt it(digraph); it != INVALID; ++it) {
+    ///    if (!d.reached(it)) {
+    ///      d.addSource(s);
+    ///      d.start();
+    ///    }
+    ///  }
+    ///\endcode
+    void run() {
+      init();
+      for (NodeIt it(*_graph); it != INVALID; ++it) {
+        if (!reached(it)) {
+          addSource(it);
+          start();
+        }
+      }
+    }
+    
+    ///@}
+
+    /// \name Query Functions
+    /// The results of the maximum cardinality search algorithm can be 
+    /// obtained using these functions.
+    /// \n
+    /// Before the use of these functions, either run() or start() must be 
+    /// called.
+    
+    ///@{
+
+    /// \brief The cardinality of a node.
+    ///
+    /// Returns the cardinality of a node.
+    /// \pre \ref run() must be called before using this function.
+    /// \warning If node \c v in unreachable from the root the return value
+    /// of this funcion is undefined.
+    Value cardinality(Node node) const { return (*_cardinality)[node]; }
+
+    /// \brief The current cardinality of a node.
+    ///
+    /// Returns the current cardinality of a node.
+    /// \pre the given node should be reached but not processed
+    Value currentCardinality(Node node) const { return (*_heap)[node]; }
+
+    /// \brief Returns a reference to the NodeMap of cardinalities.
+    ///
+    /// Returns a reference to the NodeMap of cardinalities. \pre \ref run() 
+    /// must be called before using this function.
+    const CardinalityMap &cardinalityMap() const { return *_cardinality;}
+ 
+    /// \brief Checks if a node is reachable from the root.
+    ///
+    /// Returns \c true if \c v is reachable from the root.
+    /// \warning The source nodes are initated as unreached.
+    /// \pre \ref run() must be called before using this function.
+    bool reached(Node v) { return (*_heap_cross_ref)[v] != Heap::PRE_HEAP; }
+
+    /// \brief Checks if a node is processed.
+    ///
+    /// Returns \c true if \c v is processed, i.e. the shortest
+    /// path to \c v has already found.
+    /// \pre \ref run() must be called before using this function.
+    bool processed(Node v) { return (*_heap_cross_ref)[v] == Heap::POST_HEAP; }
+    
+    ///@}
+  };
+
+}
+
+#endif
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -31,6 +31,7 @@
   kruskal_test
   maps_test
   matching_test
+  max_cardinality_search_test
   max_clique_test
   min_cost_arborescence_test
   min_cost_flow_test
diff --git a/test/Makefile.am b/test/Makefile.am
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -33,6 +33,7 @@
 	test/kruskal_test \
 	test/maps_test \
 	test/matching_test \
+	test/max_cardinality_search_test \
 	test/max_clique_test \
 	test/min_cost_arborescence_test \
 	test/min_cost_flow_test \
@@ -85,6 +86,7 @@
 test_maps_test_SOURCES = test/maps_test.cc
 test_mip_test_SOURCES = test/mip_test.cc
 test_matching_test_SOURCES = test/matching_test.cc
+test_max_cardinality_search_test_SOURCES = test/max_cardinality_search_test.cc
 test_max_clique_test_SOURCES = test/max_clique_test.cc
 test_min_cost_arborescence_test_SOURCES = test/min_cost_arborescence_test.cc
 test_min_cost_flow_test_SOURCES = test/min_cost_flow_test.cc
diff --git a/test/max_cardinality_search_test.cc b/test/max_cardinality_search_test.cc
new file mode 100644
--- /dev/null
+++ b/test/max_cardinality_search_test.cc
@@ -0,0 +1,162 @@
+/* -*- mode: C++; indent-tabs-mode: nil; -*-
+ *
+ * This file is a part of LEMON, a generic C++ optimization library.
+ *
+ * Copyright (C) 2003-2010
+ * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
+ * (Egervary Research Group on Combinatorial Optimization, EGRES).
+ *
+ * Permission to use, modify and distribute this software is granted
+ * provided that this copyright notice appears in all copies. For
+ * precise terms see the accompanying LICENSE file.
+ *
+ * This software is provided "AS IS" with no warranty of any kind,
+ * express or implied, and with no claim as to its suitability for any
+ * purpose.
+ *
+ */
+
+#include <iostream>
+
+#include "test_tools.h"
+#include <lemon/smart_graph.h>
+#include <lemon/max_cardinality_search.h>
+#include <lemon/concepts/digraph.h>
+#include <lemon/concepts/maps.h>
+#include <lemon/concepts/heap.h>
+#include <lemon/lgf_reader.h>
+
+using namespace lemon;
+using namespace std;
+
+char test_lgf[] =
+  "@nodes\n"
+  "label\n"
+  "0\n"
+  "1\n"
+  "2\n"
+  "3\n"
+  "@arcs\n"
+  "    label capacity\n"
+  "0 1 0     2\n"
+  "1 0 1     2\n"
+  "2 1 2     1\n"
+  "2 3 3     3\n"
+  "3 2 4     3\n"
+  "3 1 5     5\n"
+  "@attributes\n"
+  "s 0\n"
+  "x 1\n"
+  "y 2\n"
+  "z 3\n";
+
+void checkMaxCardSearchCompile() {
+
+  typedef concepts::Digraph Digraph;
+  typedef int Value;
+  typedef Digraph::Node Node;
+  typedef Digraph::Arc Arc;
+  typedef concepts::ReadMap<Arc,Value> CapMap;
+  typedef concepts::ReadWriteMap<Node,Value> CardMap;
+  typedef concepts::ReadWriteMap<Node,bool> ProcMap;
+  typedef Digraph::NodeMap<int> HeapCrossRef;
+
+  Digraph g;
+  Node n,s;
+  CapMap cap;
+  CardMap card;
+  ProcMap proc;
+  HeapCrossRef crossref(g);
+  
+  typedef MaxCardinalitySearch<Digraph,CapMap>
+    ::SetCapacityMap<CapMap>
+    ::SetCardinalityMap<CardMap>
+    ::SetProcessedMap<ProcMap>
+    ::SetStandardHeap<BinHeap<Value,HeapCrossRef> >
+    ::Create MaxCardType;
+
+  MaxCardType maxcard(g,cap);
+  const MaxCardType& const_maxcard = maxcard;
+
+  const MaxCardType::Heap& heap_const = const_maxcard.heap();
+  MaxCardType::Heap& heap = const_cast<MaxCardType::Heap&>(heap_const);
+  maxcard.heap(heap,crossref);
+  
+  maxcard.capacityMap(cap).cardinalityMap(card).processedMap(proc);
+
+  maxcard.init();
+  maxcard.addSource(s);
+  n = maxcard.nextNode();
+   maxcard.processNextNode();
+   maxcard.start();
+   maxcard.run(s);
+   maxcard.run();
+ }
+
+ void checkWithIntMap( std::istringstream& input)
+ {
+   typedef SmartDigraph Digraph;
+   typedef Digraph::Node Node;
+   typedef Digraph::ArcMap<int> CapMap;
+
+   Digraph g;
+   Node s,x,y,z,a;
+   CapMap cap(g);
+
+   DigraphReader<Digraph>(g,input).
+     arcMap("capacity", cap).
+     node("s",s).
+     node("x",x).
+     node("y",y).
+     node("z",z).
+     run();
+
+   MaxCardinalitySearch<Digraph,CapMap> maxcard(g,cap);
+
+   maxcard.init();
+   maxcard.addSource(s);
+   maxcard.start(x);
+
+   check(maxcard.processed(s) and !maxcard.processed(x) and
+         !maxcard.processed(y), "Wrong processed()!");
+
+   a=maxcard.nextNode();
+   check(maxcard.processNextNode()==a,
+         "Wrong nextNode() or processNextNode() return value!");
+
+   check(maxcard.processed(a), "Wrong processNextNode()!");
+
+   maxcard.start();
+   check(maxcard.cardinality(x)==2 and maxcard.cardinality(y)>=4,
+         "Wrong cardinalities!");
+ }
+
+ void checkWithConst1Map(std::istringstream &input) {
+   typedef SmartDigraph Digraph;
+   typedef Digraph::Node Node;
+
+   Digraph g;
+   Node s,x,y,z;
+
+  DigraphReader<Digraph>(g,input).
+    node("s",s).
+    node("x",x).
+    node("y",y).
+    node("z",z).
+    run();
+
+  MaxCardinalitySearch<Digraph> maxcard(g);
+  maxcard.run(s);
+  check(maxcard.cardinality(x)==1 &&
+        maxcard.cardinality(y)+maxcard.cardinality(z)==3,
+        "Wrong cardinalities!");
+}
+
+int main() {
+
+  std::istringstream input1(test_lgf);
+  checkWithIntMap(input1);
+
+  std::istringstream input2(test_lgf);
+  checkWithConst1Map(input2);
+}