77 lines
2.6 KiB
Java
77 lines
2.6 KiB
Java
// 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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// [START program]
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package com.google.ortools.constraintsolver.samples;
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// [START import]
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import com.google.ortools.Loader;
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import com.google.ortools.constraintsolver.DecisionBuilder;
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import com.google.ortools.constraintsolver.IntVar;
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import com.google.ortools.constraintsolver.Solver;
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import java.util.logging.Logger;
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// [END import]
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/** Simple CP Program.*/
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public class SimpleCpProgram {
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private SimpleCpProgram() {}
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private static final Logger logger = Logger.getLogger(SimpleCpProgram.class.getName());
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public static void main(String[] args) throws Exception {
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Loader.loadNativeLibraries();
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// Instantiate the solver.
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// [START solver]
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Solver solver = new 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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final long numVals = 3;
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final IntVar x = solver.makeIntVar(0, numVals - 1, "x");
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final IntVar y = solver.makeIntVar(0, numVals - 1, "y");
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final IntVar z = solver.makeIntVar(0, numVals - 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(new IntVar[] {x, y}));
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logger.info("Number of constraints: " + 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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final DecisionBuilder db = solver.makePhase(
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new IntVar[] {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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logger.info(
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String.format("Solution: %d\n x=%d y=%d z=%d", count, x.value(), y.value(), z.value()));
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}
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solver.endSearch();
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logger.info("Number of solutions found: " + solver.solutions());
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// [END print_solution]
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// [START advanced]
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logger.info(String.format("Advanced usage:\nProblem solved in %d ms\nMemory usage: %d bytes",
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solver.wallTime(), Solver.memoryUsage()));
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// [END advanced]
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}
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}
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// [END program]
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