alpar@906: /* -*- C++ -*-
alpar@906:  *
alpar@1956:  * This file is a part of LEMON, a generic C++ optimization library
alpar@1956:  *
alpar@2391:  * Copyright (C) 2003-2007
alpar@1956:  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
alpar@1359:  * (Egervary Research Group on Combinatorial Optimization, EGRES).
alpar@906:  *
alpar@906:  * Permission to use, modify and distribute this software is granted
alpar@906:  * provided that this copyright notice appears in all copies. For
alpar@906:  * precise terms see the accompanying LICENSE file.
alpar@906:  *
alpar@906:  * This software is provided "AS IS" with no warranty of any kind,
alpar@906:  * express or implied, and with no claim as to its suitability for any
alpar@906:  * purpose.
alpar@906:  *
alpar@906:  */
alpar@906: 
alpar@921: #ifndef LEMON_DIMACS_H
alpar@921: #define LEMON_DIMACS_H
marci@423: 
marci@423: #include <iostream>
marci@423: #include <string>
marci@423: #include <vector>
alpar@921: #include <lemon/maps.h>
deba@1993: #include <lemon/bits/invalid.h>
marci@423: 
alpar@1287: /// \ingroup dimacs_group
klao@442: /// \file
klao@442: /// \brief Dimacs file format reader.
klao@427: 
alpar@921: namespace lemon {
marci@423: 
alpar@1287:   ///
alpar@1287:   ///@defgroup dimacs_group DIMACS format
alpar@1287:   ///\brief Read and write files in DIMACS format
alpar@1287:   ///
alpar@1287:   ///Tools to read a graph from or write it to a file in DIMACS format
alpar@1287:   ///data
alpar@1287:   ///\ingroup io_group
marci@423: 
alpar@1287:   /// \addtogroup dimacs_group
jacint@575:   /// @{
jacint@575: 
jacint@575:   /// Dimacs min cost flow reader function.
jacint@575: 
jacint@575:   /// This function reads a min cost flow instance from dimacs format,
alpar@964:   /// i.e. from dimacs files having a line starting with
alpar@1946:   ///\code
alpar@964:   /// p "min"
alpar@1946:   ///\endcode
jacint@575:   /// At the beginning \c g is cleared by \c g.clear(). The edge
jacint@575:   /// capacities are written to \c capacity, \c s and \c t are set to
jacint@575:   /// the source and the target nodes resp. and the cost of the edges
jacint@575:   /// are written to \c cost.
marci@465:   ///
jacint@575:   /// \author Marton Makai
jacint@528:   template<typename Graph, typename CapacityMap, typename CostMap>
jacint@528:   void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity, 
jacint@528: 		  typename Graph::Node &s, typename Graph::Node &t, 
jacint@528: 		  CostMap& cost) {
jacint@528:     g.clear();
alpar@987:     typename CapacityMap::Value _cap;
alpar@987:     typename CostMap::Value _cost;
jacint@528:     char d;
jacint@528:     std::string problem;
jacint@528:     char c;
jacint@528:     int i, j;
jacint@528:     std::string str;
jacint@528:     int n, m; 
jacint@528:     typename Graph::Edge e;
jacint@528:     std::vector<typename Graph::Node> nodes;
jacint@528:     while (is>>c) {
jacint@528:       switch (c) {
jacint@528:       case 'c': //comment
jacint@528: 	getline(is, str);
jacint@528: 	break;
jacint@528:       case 'p': //problem definition
jacint@528: 	is >> problem >> n >> m;
jacint@528: 	getline(is, str);
jacint@528: 	nodes.resize(n+1);
jacint@528: 	for (int k=1; k<=n; ++k) nodes[k]=g.addNode();
jacint@528: 	break;
jacint@528:       case 'n': //node definition
jacint@528: 	if (problem=="sp") { //shortest path problem
jacint@528: 	  is >> i;
jacint@528: 	  getline(is, str);
jacint@528: 	  s=nodes[i];
jacint@528: 	}
jacint@528: 	if (problem=="max" || problem=="min") { //((max) or (min cost)) flow problem
jacint@528: 	  is >> i >> d;
jacint@528: 	  getline(is, str);
jacint@528: 	  if (d=='s') s=nodes[i];
jacint@528: 	  if (d=='t') t=nodes[i];
jacint@528: 	}
jacint@528: 	break;
jacint@528:       case 'a':
jacint@528: 	if ( problem == "max" || problem == "sp") {
jacint@528: 	  is >> i >> j >> _cap;
jacint@528: 	  getline(is, str);
jacint@528: 	  e=g.addEdge(nodes[i], nodes[j]);
marci@784: 	  //capacity.update();
jacint@528: 	  capacity.set(e, _cap);
jacint@575: 	} else {
jacint@575: 	  if ( problem == "min" ) {
jacint@575: 	    is >> i >> j >> _cap >> _cost;
jacint@575: 	    getline(is, str);
jacint@575: 	    e=g.addEdge(nodes[i], nodes[j]);
marci@784: 	    //capacity.update();
jacint@575: 	    capacity.set(e, _cap);
marci@784: 	    //cost.update();
jacint@575: 	    cost.set(e, _cost);
jacint@575: 	  } else {
jacint@575: 	    is >> i >> j;
jacint@575: 	    getline(is, str);
jacint@575: 	    g.addEdge(nodes[i], nodes[j]);
jacint@575: 	  }
jacint@528: 	}
jacint@528: 	break;
jacint@528:       }
jacint@528:     }
jacint@528:   }
jacint@528: 
jacint@528: 
jacint@575:   /// Dimacs max flow reader function.
jacint@575: 
jacint@575:   /// This function reads a max flow instance from dimacs format,
alpar@964:   /// i.e. from dimacs files having a line starting with
alpar@1946:   ///\code
alpar@964:   /// p "max"
alpar@1946:   ///\endcode
alpar@964:   ///At the beginning \c g is cleared by \c g.clear(). The
jacint@575:   /// edge capacities are written to \c capacity and \c s and \c t are
jacint@575:   /// set to the source and the target nodes.
jacint@575:   ///
jacint@575:   /// \author Marton Makai
jacint@575:   template<typename Graph, typename CapacityMap>
jacint@575:   void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity, 
jacint@575: 		  typename Graph::Node &s, typename Graph::Node &t) {
jacint@575:     NullMap<typename Graph::Edge, int> n;
jacint@575:     readDimacs(is, g, capacity, s, t, n);
jacint@575:   }
jacint@575: 
jacint@575: 
jacint@575:   /// Dimacs shortest path reader function.
jacint@575: 
jacint@575:   /// This function reads a shortest path instance from dimacs format,
alpar@964:   /// i.e. from dimacs files having a line starting with
alpar@1946:   ///\code
alpar@964:   /// p "sp"
alpar@1946:   ///\endcode
jacint@575:   /// At the beginning \c g is cleared by \c g.clear(). The edge
jacint@575:   /// capacities are written to \c capacity and \c s is set to the
jacint@575:   /// source node.
jacint@575:   ///
jacint@575:   /// \author Marton Makai
jacint@575:   template<typename Graph, typename CapacityMap>
jacint@575:   void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity, 
jacint@575: 		  typename Graph::Node &s) {
jacint@575:     NullMap<typename Graph::Edge, int> n;
jacint@575:     readDimacs(is, g, capacity, s, s, n);
jacint@575:   }
jacint@575: 
jacint@575: 
jacint@575:   /// Dimacs capacitated graph reader function.
jacint@575: 
jacint@575:   /// This function reads an edge capacitated graph instance from
jacint@575:   /// dimacs format.  At the beginning \c g is cleared by \c g.clear()
jacint@575:   /// and the edge capacities are written to \c capacity.
jacint@575:   ///
jacint@575:   /// \author Marton Makai
jacint@575:   template<typename Graph, typename CapacityMap>
jacint@575:   void readDimacs(std::istream& is, Graph &g, CapacityMap& capacity) {
jacint@575:     typename Graph::Node u;
jacint@575:     NullMap<typename Graph::Edge, int> n;
jacint@575:     readDimacs(is, g, capacity, u, u, n);
jacint@575:   }
jacint@575: 
jacint@575: 
jacint@575:   /// Dimacs plain graph reader function.
jacint@575: 
jacint@575:   /// This function reads a graph without any designated nodes and
jacint@575:   /// maps from dimacs format, i.e. from dimacs files having a line
alpar@964:   /// starting with
alpar@1946:   ///\code
alpar@964:   /// p "mat"
alpar@1946:   ///\endcode
alpar@964:   /// At the beginning \c g is cleared
jacint@575:   /// by \c g.clear().
jacint@575:   ///
jacint@575:   /// \author Marton Makai
jacint@575:   template<typename Graph>
jacint@575:   void readDimacs(std::istream& is, Graph &g) {
jacint@575:     typename Graph::Node u;
jacint@575:     NullMap<typename Graph::Edge, int> n;
jacint@575:     readDimacs(is, g, n, u, u, n);
jacint@575:   }
jacint@575:   
jacint@575: 
jacint@575: 
marci@423:   
jacint@528:   /// write matching problem
jacint@528:   template<typename Graph>
jacint@528:   void writeDimacs(std::ostream& os, const Graph &g) {
jacint@528:     typedef typename Graph::NodeIt NodeIt;
jacint@528:     typedef typename Graph::EdgeIt EdgeIt;  
jacint@528:     
jacint@528:     typename Graph::template NodeMap<int> nodes(g);
jacint@528: 
jacint@528:     os << "c matching problem" << std::endl;
jacint@528: 
jacint@528:     int i=1;
marci@778:     for(NodeIt v(g); v!=INVALID; ++v) {
jacint@528:       nodes.set(v, i);
jacint@528:       ++i;
jacint@528:     }    
jacint@528:     
jacint@528:     os << "p mat " << g.nodeNum() << " " << g.edgeNum() << std::endl;
jacint@528: 
marci@778:     for(EdgeIt e(g); e!=INVALID; ++e) {
alpar@986:       os << "a " << nodes[g.source(e)] << " " << nodes[g.target(e)] << std::endl; 
jacint@528:     }
jacint@528: 
jacint@528:   }
jacint@528: 
jacint@575:   /// @}
jacint@528: 
alpar@921: } //namespace lemon
marci@423: 
alpar@921: #endif //LEMON_DIMACS_H