4f381f6d07
* bump abseil to 20250814 * bump protobuf to v32.0 * cmake: add ccache auto support * backport flatzinc, math_opt and sat update
70 lines
2.1 KiB
Go
70 lines
2.1 KiB
Go
// 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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// The solution_hinting_sample_sat command is an example of setting solution hints on the model.
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package main
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import (
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"fmt"
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log "github.com/golang/glog"
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"github.com/google/or-tools/ortools/sat/go/cpmodel"
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cmpb "github.com/google/or-tools/ortools/sat/proto/cpmodel"
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)
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func solutionHintingSampleSat() error {
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model := cpmodel.NewCpModelBuilder()
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domain := cpmodel.NewDomain(0, 2)
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x := model.NewIntVarFromDomain(domain).WithName("x")
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y := model.NewIntVarFromDomain(domain).WithName("y")
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z := model.NewIntVarFromDomain(domain).WithName("z")
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model.AddNotEqual(x, y)
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model.Maximize(cpmodel.NewLinearExpr().AddWeightedSum([]cpmodel.LinearArgument{x, y, z}, []int64{1, 2, 3}))
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// Solution hinting: x <- 1, y <- 2
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hint := &cpmodel.Hint{Ints: map[cpmodel.IntVar]int64{x: 7}}
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model.SetHint(hint)
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m, err := model.Model()
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if err != nil {
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return fmt.Errorf("failed to instantiate the CP model: %w", err)
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}
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response, err := cpmodel.SolveCpModel(m)
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if err != nil {
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return fmt.Errorf("failed to solve the model: %w", err)
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}
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fmt.Printf("Status: %v\n", response.GetStatus())
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if response.GetStatus() == cmpb.CpSolverStatus_OPTIMAL {
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fmt.Printf(" x = %v\n", cpmodel.SolutionIntegerValue(response, x))
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fmt.Printf(" y = %v\n", cpmodel.SolutionIntegerValue(response, y))
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fmt.Printf(" z = %v\n", cpmodel.SolutionIntegerValue(response, z))
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}
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return nil
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}
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func main() {
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if err := solutionHintingSampleSat(); err != nil {
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log.Exitf("solutionHintingSampleSat returned with error: %v", err)
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}
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}
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// [END program]
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