80 lines
2.9 KiB
C++
80 lines
2.9 KiB
C++
// Copyright 2010-2022 Google LLC
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
//
|
|
// Function for outputting an assignment problem in DIMACS format:
|
|
// http://lpsolve.sourceforge.net/5.5/DIMACS_asn.htm
|
|
//
|
|
#ifndef OR_TOOLS_EXAMPLES_PRINT_DIMACS_ASSIGNMENT_H_
|
|
#define OR_TOOLS_EXAMPLES_PRINT_DIMACS_ASSIGNMENT_H_
|
|
|
|
#include <cstdio>
|
|
#include <string>
|
|
|
|
#include "absl/status/status.h"
|
|
#include "absl/strings/str_format.h"
|
|
#include "ortools/base/file.h"
|
|
#include "ortools/base/helpers.h"
|
|
#include "ortools/base/logging.h"
|
|
#include "ortools/graph/ebert_graph.h"
|
|
#include "ortools/graph/linear_assignment.h"
|
|
|
|
namespace operations_research {
|
|
|
|
template <typename GraphType>
|
|
class LinearSumAssignment;
|
|
|
|
// Given a LinearSumAssigment object representing an assignment problem
|
|
// description, outputs the problem in DIMACS format in the output file.
|
|
// For a description of the format, see
|
|
// http://lpsolve.sourceforge.net/5.5/DIMACS_asn.htm
|
|
template <typename GraphType>
|
|
void PrintDimacsAssignmentProblem(
|
|
const LinearSumAssignment<GraphType>& assignment,
|
|
const TailArrayManager<GraphType>& tail_array_manager,
|
|
const std::string& output_filename);
|
|
|
|
template <typename GraphType>
|
|
void PrintDimacsAssignmentProblem(
|
|
const LinearSumAssignment<GraphType>& assignment,
|
|
const TailArrayManager<GraphType>& tail_array_manager,
|
|
const std::string& output_filename) {
|
|
File* output;
|
|
CHECK_OK(file::Open(output_filename, "w", &output, file::Defaults()));
|
|
const GraphType& graph(assignment.Graph());
|
|
std::string output_line =
|
|
absl::StrFormat("p asn %d %d\n", graph.num_nodes(), graph.num_arcs());
|
|
CHECK_OK(file::WriteString(output, output_line, file::Defaults()));
|
|
|
|
for (typename LinearSumAssignment<GraphType>::BipartiteLeftNodeIterator
|
|
node_it(assignment);
|
|
node_it.Ok(); node_it.Next()) {
|
|
output_line = absl::StrFormat("n %d\n", node_it.Index() + 1);
|
|
CHECK_OK(file::WriteString(output, output_line, file::Defaults()));
|
|
}
|
|
|
|
tail_array_manager.BuildTailArrayFromAdjacencyListsIfForwardGraph();
|
|
|
|
for (typename GraphType::ArcIterator arc_it(assignment.Graph()); arc_it.Ok();
|
|
arc_it.Next()) {
|
|
ArcIndex arc = arc_it.Index();
|
|
output_line = absl::StrFormat("a %d %d %d\n", graph.Tail(arc) + 1,
|
|
graph.Head(arc) + 1, assignment.ArcCost(arc));
|
|
CHECK_OK(file::WriteString(output, output_line, file::Defaults()));
|
|
}
|
|
}
|
|
|
|
} // namespace operations_research
|
|
|
|
#endif // OR_TOOLS_EXAMPLES_PRINT_DIMACS_ASSIGNMENT_H_
|