80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
// Copyright 2010-2021 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 <string>
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#include "ortools/constraint_solver/constraint_solver.h"
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// [END import]
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namespace operations_research {
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void SimpleCpProgram() {
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// Instantiate the solver.
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// [START solver]
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Solver solver("CpSimple");
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// [END solver]
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// Create the variables.
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// [START variables]
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const int64_t num_vals = 3;
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IntVar* const x = solver.MakeIntVar(0, num_vals - 1, "x");
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IntVar* const y = solver.MakeIntVar(0, num_vals - 1, "y");
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IntVar* const z = solver.MakeIntVar(0, num_vals - 1, "z");
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// [END variables]
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// Constraint 0: x != y..
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// [START constraints]
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solver.AddConstraint(solver.MakeAllDifferent({x, y}));
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LOG(INFO) << "Number of constraints: "
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<< std::to_string(solver.constraints());
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// [END constraints]
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// Solve the problem.
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// [START solve]
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DecisionBuilder* const db = solver.MakePhase(
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{x, y, z}, Solver::CHOOSE_FIRST_UNBOUND, Solver::ASSIGN_MIN_VALUE);
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// [END solve]
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// Print solution on console.
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// [START print_solution]
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int count = 0;
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solver.NewSearch(db);
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while (solver.NextSolution()) {
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++count;
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LOG(INFO) << "Solution " << count << ":" << std::endl
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<< " x=" << x->Value() << " y=" << y->Value()
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<< " z=" << z->Value();
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}
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solver.EndSearch();
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LOG(INFO) << "Number of solutions found: " << solver.solutions();
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// [END print_solution]
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// [START advanced]
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LOG(INFO) << "Advanced usage:" << std::endl
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<< "Problem solved in " << std::to_string(solver.wall_time())
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<< "ms" << std::endl
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<< "Memory usage: " << std::to_string(Solver::MemoryUsage())
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<< "bytes";
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// [END advanced]
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}
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} // namespace operations_research
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int main(int argc, char** argv) {
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operations_research::SimpleCpProgram();
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return EXIT_SUCCESS;
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}
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// [END program]
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