96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
//=======================================================================
|
|
// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
|
|
//
|
|
// Distributed under the Boost Software License, Version 1.0. (See
|
|
// accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
//=======================================================================
|
|
|
|
#ifdef _MSC_VER
|
|
#define _CRT_SECURE_NO_WARNINGS
|
|
#endif
|
|
|
|
#include <boost/config.hpp>
|
|
#include <iostream>
|
|
#include <string>
|
|
#include <boost/graph/edmonds_karp_max_flow.hpp>
|
|
#include <boost/graph/adjacency_list.hpp>
|
|
#include <boost/graph/read_dimacs.hpp>
|
|
#include <boost/graph/graph_utility.hpp>
|
|
|
|
// Use a DIMACS network flow file as stdin.
|
|
// edmonds-karp-eg < max_flow.dat
|
|
//
|
|
// Sample output:
|
|
// c The total flow:
|
|
// s 13
|
|
//
|
|
// c flow values:
|
|
// f 0 6 3
|
|
// f 0 1 6
|
|
// f 0 2 4
|
|
// f 1 5 1
|
|
// f 1 0 0
|
|
// f 1 3 5
|
|
// f 2 4 4
|
|
// f 2 3 0
|
|
// f 2 0 0
|
|
// f 3 7 5
|
|
// f 3 2 0
|
|
// f 3 1 0
|
|
// f 4 5 4
|
|
// f 4 6 0
|
|
// f 5 4 0
|
|
// f 5 7 5
|
|
// f 6 7 3
|
|
// f 6 4 0
|
|
// f 7 6 0
|
|
// f 7 5 0
|
|
|
|
int
|
|
main()
|
|
{
|
|
using namespace boost;
|
|
|
|
typedef adjacency_list_traits < vecS, vecS, directedS > Traits;
|
|
typedef adjacency_list < listS, vecS, directedS,
|
|
property < vertex_name_t, std::string >,
|
|
property < edge_capacity_t, long,
|
|
property < edge_residual_capacity_t, long,
|
|
property < edge_reverse_t, Traits::edge_descriptor > > > > Graph;
|
|
|
|
Graph g;
|
|
|
|
property_map < Graph, edge_capacity_t >::type
|
|
capacity = get(edge_capacity, g);
|
|
property_map < Graph, edge_reverse_t >::type rev = get(edge_reverse, g);
|
|
property_map < Graph, edge_residual_capacity_t >::type
|
|
residual_capacity = get(edge_residual_capacity, g);
|
|
|
|
Traits::vertex_descriptor s, t;
|
|
read_dimacs_max_flow(g, capacity, rev, s, t);
|
|
|
|
#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
|
|
std::vector<default_color_type> color(num_vertices(g));
|
|
std::vector<Traits::edge_descriptor> pred(num_vertices(g));
|
|
long flow = edmonds_karp_max_flow
|
|
(g, s, t, capacity, residual_capacity, rev, &color[0], &pred[0]);
|
|
#else
|
|
long flow = edmonds_karp_max_flow(g, s, t);
|
|
#endif
|
|
|
|
std::cout << "c The total flow:" << std::endl;
|
|
std::cout << "s " << flow << std::endl << std::endl;
|
|
|
|
std::cout << "c flow values:" << std::endl;
|
|
graph_traits < Graph >::vertex_iterator u_iter, u_end;
|
|
graph_traits < Graph >::out_edge_iterator ei, e_end;
|
|
for (boost::tie(u_iter, u_end) = vertices(g); u_iter != u_end; ++u_iter)
|
|
for (boost::tie(ei, e_end) = out_edges(*u_iter, g); ei != e_end; ++ei)
|
|
if (capacity[*ei] > 0)
|
|
std::cout << "f " << *u_iter << " " << target(*ei, g) << " "
|
|
<< (capacity[*ei] - residual_capacity[*ei]) << std::endl;
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|