75 lines
2.5 KiB
C#
75 lines
2.5 KiB
C#
// Copyright 2010-2018 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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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.IO;
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using System.Text.RegularExpressions;
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using Google.OrTools.ConstraintSolver;
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public class OrTools {
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private static long Solve(long num_buses_check = 0) {
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ConstraintSolverParameters sPrm = Solver.DefaultSolverParameters();
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sPrm.CompressTrail = 0;
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Solver solver = new Solver("OrTools",sPrm);
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//this works
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// IntVar[,] x = solver.MakeIntVarMatrix(2,2, new int[] {-2,0,1,2}, "x");
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//this doesn't work
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IntVar[,] x = solver.MakeIntVarMatrix(2, 2, new int[] { 0, 1, 2 }, "x");
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for (int w = 0; w < 2; w++) {
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IntVar[] b = new IntVar[2];
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for (int i = 0; i < 2; i++) {
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b[i] = solver.MakeIsEqualCstVar(x[w, i], 0);
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}
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solver.Add(solver.MakeSumGreaterOrEqual(b, 2));
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}
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IntVar[] x_flat = x.Flatten();
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DecisionBuilder db = solver.MakePhase(
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x_flat,
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Solver.CHOOSE_FIRST_UNBOUND,
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Solver.ASSIGN_MIN_VALUE);
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solver.NewSearch(db);
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while (solver.NextSolution()) {
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Console.WriteLine("x: ");
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for (int j = 0; j < 2; j++) {
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Console.Write("worker" + (j + 1).ToString() + ":");
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for (int i = 0; i < 2; i++) {
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Console.Write(" {0,2} ", x[j, i].Value());
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}
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Console.Write("\n");
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}
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Console.WriteLine("End at---->" + DateTime.Now);
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}
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Console.WriteLine("\nSolutions: {0}", solver.Solutions());
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Console.WriteLine("WallTime: {0}ms", solver.WallTime());
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Console.WriteLine("Failures: {0}", solver.Failures());
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Console.WriteLine("Branches: {0} ", solver.Branches());
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solver.EndSearch();
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return 1;
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}
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public static void Main(String[] args) {
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Console.WriteLine("Check for minimum number of buses: ");
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long num_buses = Solve();
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Console.WriteLine("\n... got {0} as minimal value.", num_buses);
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Console.WriteLine("\nAll solutions: ", num_buses);
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}
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}
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