82 lines
2.5 KiB
C++
82 lines
2.5 KiB
C++
// Copyright 2010-2025 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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// [START program]
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// [START import]
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#include <stdlib.h>
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#include "absl/base/log_severity.h"
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#include "absl/log/globals.h"
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#include "absl/types/span.h"
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#include "ortools/base/init_google.h"
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#include "ortools/base/logging.h"
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#include "ortools/sat/cp_model.h"
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#include "ortools/sat/cp_model.pb.h"
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#include "ortools/sat/cp_model_solver.h"
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#include "ortools/util/sorted_interval_list.h"
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// [END import]
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namespace operations_research {
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namespace sat {
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void AssumptionsSampleSat() {
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// [START model]
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CpModelBuilder cp_model;
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// [END model]
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// [START variables]
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const Domain domain(0, 10);
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const IntVar x = cp_model.NewIntVar(domain).WithName("x");
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const IntVar y = cp_model.NewIntVar(domain).WithName("y");
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const IntVar z = cp_model.NewIntVar(domain).WithName("z");
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const BoolVar a = cp_model.NewBoolVar().WithName("a");
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const BoolVar b = cp_model.NewBoolVar().WithName("b");
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const BoolVar c = cp_model.NewBoolVar().WithName("c");
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// [END variables]
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// [START constraints]
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cp_model.AddGreaterThan(x, y).OnlyEnforceIf(a);
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cp_model.AddGreaterThan(y, z).OnlyEnforceIf(b);
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cp_model.AddGreaterThan(z, x).OnlyEnforceIf(c);
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// [END constraints]
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// Add assumptions
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cp_model.AddAssumptions({a, b, c});
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// Solving part.
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// [START solve]
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const CpSolverResponse response = Solve(cp_model.Build());
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// [END solve]
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// Print solution.
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// [START print_solution]
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LOG(INFO) << CpSolverResponseStats(response);
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if (response.status() == CpSolverStatus::INFEASIBLE) {
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for (const int index :
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response.sufficient_assumptions_for_infeasibility()) {
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LOG(INFO) << index;
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}
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}
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// [END print_solution]
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}
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} // namespace sat
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} // namespace operations_research
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int main(int argc, char* argv[]) {
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InitGoogle(argv[0], &argc, &argv, true);
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absl::SetStderrThreshold(absl::LogSeverityAtLeast::kInfo);
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operations_research::sat::AssumptionsSampleSat();
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return EXIT_SUCCESS;
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}
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// [END program]
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