c34026b101
note: done using ```sh git grep -l "2010-2024 Google" | xargs sed -i 's/2010-2024 Google/2010-2025 Google/' ```
88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
// Copyright 2010-2025 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.
|
|
|
|
// [START program]
|
|
// [START import]
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
|
|
#include <algorithm>
|
|
|
|
#include "ortools/base/logging.h"
|
|
#include "ortools/sat/cp_model.h"
|
|
#include "ortools/sat/cp_model.pb.h"
|
|
#include "ortools/sat/cp_model_solver.h"
|
|
#include "ortools/util/sorted_interval_list.h"
|
|
// [END import]
|
|
|
|
namespace operations_research {
|
|
namespace sat {
|
|
|
|
void CpSatExample() {
|
|
// [START model]
|
|
CpModelBuilder cp_model;
|
|
// [END model]
|
|
|
|
// [START variables]
|
|
int64_t var_upper_bound = std::max({50, 45, 37});
|
|
const Domain domain(0, var_upper_bound);
|
|
const IntVar x = cp_model.NewIntVar(domain).WithName("x");
|
|
const IntVar y = cp_model.NewIntVar(domain).WithName("y");
|
|
const IntVar z = cp_model.NewIntVar(domain).WithName("z");
|
|
// [END variables]
|
|
|
|
// [START constraints]
|
|
cp_model.AddLessOrEqual(2 * x + 7 * y + 3 * z, 50);
|
|
cp_model.AddLessOrEqual(3 * x - 5 * y + 7 * z, 45);
|
|
cp_model.AddLessOrEqual(5 * x + 2 * y - 6 * z, 37);
|
|
// [END constraints]
|
|
|
|
// [START objective]
|
|
cp_model.Maximize(2 * x + 2 * y + 3 * z);
|
|
// [END objective]
|
|
|
|
// Solving part.
|
|
// [START solve]
|
|
const CpSolverResponse response = Solve(cp_model.Build());
|
|
// [END solve]
|
|
|
|
// [START print_solution]
|
|
if (response.status() == CpSolverStatus::OPTIMAL ||
|
|
response.status() == CpSolverStatus::FEASIBLE) {
|
|
// Get the value of x in the solution.
|
|
LOG(INFO) << "Maximum of objective function: "
|
|
<< response.objective_value();
|
|
LOG(INFO) << "x = " << SolutionIntegerValue(response, x);
|
|
LOG(INFO) << "y = " << SolutionIntegerValue(response, y);
|
|
LOG(INFO) << "z = " << SolutionIntegerValue(response, z);
|
|
} else {
|
|
LOG(INFO) << "No solution found.";
|
|
}
|
|
// [END print_solution]
|
|
|
|
// Statistics.
|
|
// [START statistics]
|
|
LOG(INFO) << "Statistics";
|
|
LOG(INFO) << CpSolverResponseStats(response);
|
|
// [END statistics]
|
|
}
|
|
|
|
} // namespace sat
|
|
} // namespace operations_research
|
|
|
|
int main() {
|
|
operations_research::sat::CpSatExample();
|
|
return EXIT_SUCCESS;
|
|
}
|
|
// [END program]
|