39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
#include "optimizer.h"
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namespace operations_research {
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void BasicExample() {
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// Create the linear solver with the GLOP backend.
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std::unique_ptr<MPSolver> solver(MPSolver::CreateSolver("SCIP"));
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if (!solver) {
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LOG(WARNING) << "SCIP solver unavailable.";
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return;
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}
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// Create the variables x and y.
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MPVariable* const x = solver->MakeIntVar(0.0, 1, "x");
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MPVariable* const y = solver->MakeIntVar(0.0, 2, "y");
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LOG(INFO) << "Number of variables = " << solver->NumVariables();
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// Create a linear constraint, 0 <= x + y <= 2.
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MPConstraint* const ct = solver->MakeRowConstraint(0.0, 2.0, "ct");
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ct->SetCoefficient(x, 1);
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ct->SetCoefficient(y, 1);
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LOG(INFO) << "Number of constraints = " << solver->NumConstraints();
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// Create the objective function, 3 * x + y.
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MPObjective* const objective = solver->MutableObjective();
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objective->SetCoefficient(x, 3);
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objective->SetCoefficient(y, 1);
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objective->SetMaximization();
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solver->Solve();
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LOG(INFO) << "Solution:" << std::endl;
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LOG(INFO) << "Objective value = " << objective->Value();
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LOG(INFO) << "x = " << x->solution_value();
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LOG(INFO) << "y = " << y->solution_value();
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}
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} // namespace operations_research
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