ortools-clone/examples/java/Knapsack.java

// Copyright 2010-2018 Google LLC
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import com.google.ortools.algorithms.KnapsackSolver;

/**
 * Sample showing how to model using the knapsack solver.
 *
 */

public class Knapsack {
  static { System.loadLibrary("jniortools"); }

  private static void solve() {
    KnapsackSolver solver =
        new KnapsackSolver(KnapsackSolver.SolverType
                               .KNAPSACK_MULTIDIMENSION_BRANCH_AND_BOUND_SOLVER,
                           "test");
    final long[] profits = {360, 83,  59,  130, 431, 67,  230, 52,  93,  125,
                            670, 892, 600, 38,  48,  147, 78,  256, 63,  17,
                            120, 164, 432, 35,  92,  110, 22,  42,  50,  323,
                            514, 28,  87,  73,  78,  15,  26,  78,  210, 36,
                            85,  189, 274, 43,  33,  10,  19,  389, 276, 312};

    final long[][] weights = {
        {7,  0,  30, 22, 80, 94, 11, 81, 70, 64, 59, 18, 0,  36, 3,  8,  15,
         42, 9,  0,  42, 47, 52, 32, 26, 48, 55, 6,  29, 84, 2,  4,  18, 56,
         7,  29, 93, 44, 71, 3,  86, 66, 31, 65, 0,  79, 20, 65, 52, 13}};

    final long[] capacities = {850};

    final long optimalProfit = 7534;
    System.out.println("Solving knapsack with " + profits.length + " items");

    solver.init(profits, weights, capacities);

    final long computedProfit = solver.solve();

    System.out.println("Optimal_Profit = " + computedProfit + "/" +
                       optimalProfit);
  }

  public static void main(String[] args) throws Exception { Knapsack.solve(); }
}