edmonds-matching-algorithm/example.cpp

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2023-11-04 17:12:18 +01:00
#include <iostream> // For writing to the standard output.
#include <fstream> // For reading input files.
#include "graph.hpp"
int main(int argc, char** argv)
{
if (argc != 2)
{
std::cout << "Expected one argument, found " << argc - 1 << std::endl;
return EXIT_FAILURE; // return 1 would do the same, but is way too easy to mix up!
}
std::fstream input_file_graph{argv[1]};
ED::Graph const graph = ED::Graph::read_dimacs(input_file_graph);
ED::Graph greedy_matching_as_graph{graph.num_nodes()};
for (ED::NodeId node_id = 0; node_id < graph.num_nodes(); ++node_id)
{
if (greedy_matching_as_graph.node(node_id).neighbors().empty())
{
for (ED::NodeId neighbor_id : graph.node(node_id).neighbors())
{
if (greedy_matching_as_graph.node(neighbor_id).neighbors().empty())
{
greedy_matching_as_graph.add_edge(node_id, neighbor_id);
break; // Do not add more edges incident to this node!
}
}
}
}
std::cout << greedy_matching_as_graph;
return EXIT_SUCCESS;
}