51 lines
2.1 KiB
C++
51 lines
2.1 KiB
C++
// Copyright 2010-2022 Google LLC
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef OR_TOOLS_ALGORITHMS_SET_COVER_READER_H_
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#define OR_TOOLS_ALGORITHMS_SET_COVER_READER_H_
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#include "absl/strings/string_view.h"
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#include "ortools/algorithms/set_cover_model.h"
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namespace operations_research {
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// Readers for set covering problems at
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// http://people.brunel.ac.uk/~mastjjb/jeb/orlib/scpinfo.html
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// All the instances have either the Beasley or the rail format.
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// There is currently NO error handling, as the files are in a limited number.
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// TODO(user): add proper error handling.
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// Also, note that the indices in the files, when mentioned, start from 1, while
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// SetCoverModel starts from 0, The translation is done at read time.
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// Reads a rail set cover problem create by Beasley and returns a SetCoverModel.
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// The format of all of these 80 data files is:
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// number of rows (m), number of columns (n)
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// for each column j, (j=1,...,n): the cost of the column c(j)
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// for each row i (i=1,...,m): the number of columns which cover
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// row i followed by a list of the columns which cover row i
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SetCoverModel ReadBeasleySetCoverProblem(absl::string_view filename);
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// Reads a rail set cover problem and returns a SetCoverModel.
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// The format of these test problems is:
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// number of rows (m), number of columns (n)
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// for each column j (j=1,...,n): the cost of the column, the
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// number of rows that it covers followed by a list of the rows
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// that it covers.
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SetCoverModel ReadRailSetCoverProblem(absl::string_view filename);
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} // namespace operations_research
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#endif // OR_TOOLS_ALGORITHMS_SET_COVER_READER_H_
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