push_relabel_max_flow

[anonymous]

if you use the code below the bug would be happened：

#include <iostream>

#include <boost/config.hpp>

#include <boost/graph/boykov_kolmogorov_max_flow.hpp>
#include <boost/graph/push_relabel_max_flow.hpp>
#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>

/*
,
boost::property <boost::vertex_color_t, boost::default_color_type,
boost::property <boost::vertex_distance_t, long,
boost::property <boost::vertex_predecessor_t, Traits::edge_descriptor > > >
*/
typedef boost::adjacency_list_traits<boost::vecS, boost::vecS, boost::directedS> Traits;
typedef boost::adjacency_list<boost::listS, boost::vecS, boost::directedS,
	boost::property < boost::vertex_name_t, std::pair<int,int>,
	boost::property < boost::vertex_color_t, boost::default_color_type,
	boost::property < boost::vertex_distance_t, long,
	boost::property < boost::vertex_predecessor_t, Traits::edge_descriptor >  > > >,
	boost::property < boost::edge_capacity_t, double,
	boost::property < boost::edge_residual_capacity_t, double,
	boost::property < boost::edge_reverse_t, Traits::edge_descriptor> > >
> Graph;

void AddEdge(	Traits::vertex_descriptor &v1,
				Traits::vertex_descriptor &v2,
				boost::property_map < Graph, boost::edge_reverse_t >::type &rev,
				const double capacity, 
				Graph &g)
{
	Traits::edge_descriptor e1 = boost::add_edge(v1, v2, g).first;
	Traits::edge_descriptor e2 = boost::add_edge(v2, v1, g).first;
	boost::put(boost::edge_capacity, g, e1, capacity);
	boost::put(boost::edge_capacity, g, e2, capacity);

	rev[e1] = e2;
	rev[e2] = e1;
	
}

int main(int argc, char* argv[])
{
	Graph g;
	boost::property_map < Graph, boost::edge_reverse_t >::type rev = get(boost::edge_reverse, g);
	std::pair<int, int> point1(0, 0);
	std::pair<int, int> point2(1, 0);
	std::pair<int, int> point3(1, 1);
	std::pair<int, int> point4(0, 1);

	Graph::vertex_descriptor u = boost::add_vertex(point1, g);
	Graph::vertex_descriptor v = boost::add_vertex(point2, g);
	Graph::vertex_descriptor w = boost::add_vertex(point3, g);
	Graph::vertex_descriptor x = boost::add_vertex(point4, g);

	//boost::add_edge(u, v, g);
	AddEdge(u, v, rev, 10.1, g);
	AddEdge(u, w, rev, 10.2, g);
	AddEdge(v, x, rev, 8.1, g);
	AddEdge(w, x, rev, 6.2, g);

	//double flow = boost::boykov_kolmogorov_max_flow(g, u, x);
	double flow = boost::push_relabel_max_flow(g, u, x);
	//double flow = boost::edmonds_karp_max_flow(g, u, x);
	boost::property_map < Graph, boost::vertex_color_t >::type
		vertex_color = get(boost::vertex_color, g);
	boost::graph_traits < Graph >::vertex_iterator u_iter, u_end;
	for (boost::tie(u_iter, u_end) = vertices(g); u_iter != u_end; ++u_iter)
	{
		std::cout << "ver: " << *u_iter << " " << vertex_color[*u_iter] << std::endl;
	}

	return 0;
}

[www.362783516@…]

if you change the code the bug would not be happened AddEdge(u, v, rev, 8.1, g); AddEdge(u, w, rev, 6.2, g); AddEdge(v, x, rev, 10.1, g); AddEdge(w, x, rev, 10.2, g); I don't know why.

[murrayc@…]

It would be helpful if you described what bug you are experiencing. For instance, what you expect to happen, and what actually happens.