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<li class="navelem"><a class="el" href="dir_a7cc1eeded8f693d0da6c729bc88c45a.html">ortools</a></li><li class="navelem"><a class="el" href="dir_80dda7a75b0dfcf996988638a63eb03a.html">algorithms</a></li><li class="navelem"><a class="el" href="dir_0e6fac3eca8a8cfa47104a63e1a57f52.html">samples</a></li> </ul>
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<div class="title">Knapsack.java</div> </div>
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<a href="Knapsack_8java.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">// Copyright 2010-2018 Google LLC</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment">// you may not use this file except in compliance with the License.</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment">// You may obtain a copy of the License at</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">//</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">// See the License for the specific language governing permissions and</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">// limitations under the License.</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">// [START program]</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">// [START import]</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="keyword">import</span> <a class="code" href="namespacecom.html">com</a>.<a class="code" href="namespacecom_1_1google.html">google</a>.<a class="code" href="namespacecom_1_1google_1_1ortools.html">ortools</a>.<a class="code" href="namespacecom_1_1google_1_1ortools_1_1algorithms.html">algorithms</a>.<a class="code" href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html">KnapsackSolver</a>;</div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">import</span> java.util.ArrayList;</div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">// [END import]</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="classKnapsack.html"> 24</a></span> <span class="keyword">public</span> <span class="keyword">class </span><a class="code" href="classKnapsack.html">Knapsack</a> {</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <span class="keyword">static</span> {</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  System.loadLibrary(<span class="stringliteral">"jniortools"</span>);</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  }</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keyword">private</span> <span class="keyword">static</span> <span class="keywordtype">void</span> solve() {</div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="comment">// [START solver]</span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <a class="code" href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html">KnapsackSolver</a> solver = <span class="keyword">new</span> <a class="code" href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html">KnapsackSolver</a>(</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <a class="code" href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html">KnapsackSolver</a>.<a class="code" href="enumcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver_1_1SolverType.html">SolverType</a>.<a class="code" href="enumcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver_1_1SolverType.html#a01954933c623c5525a6c1cfdfaa05de7">KNAPSACK_MULTIDIMENSION_BRANCH_AND_BOUND_SOLVER</a>, <span class="stringliteral">"test"</span>);</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="comment">// [END solver]</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> </div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="comment">// [START data]</span></div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keyword">final</span> <span class="keywordtype">long</span>[] values = {360, 83, 59, 130, 431, 67, 230, 52, 93, 125, 670, 892, 600, 38, 48, 147,</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  78, 256, 63, 17, 120, 164, 432, 35, 92, 110, 22, 42, 50, 323, 514, 28, 87, 73, 78, 15, 26,</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  78, 210, 36, 85, 189, 274, 43, 33, 10, 19, 389, 276, 312};</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span> </div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keyword">final</span> <span class="keywordtype">long</span>[][] weights = {{7, 0, 30, 22, 80, 94, 11, 81, 70, 64, 59, 18, 0, 36, 3, 8, 15, 42, 9,</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  0, 42, 47, 52, 32, 26, 48, 55, 6, 29, 84, 2, 4, 18, 56, 7, 29, 93, 44, 71, 3, 86, 66, 31,</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  65, 0, 79, 20, 65, 52, 13}};</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">final</span> <span class="keywordtype">long</span>[] capacities = {850};</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// [END data]</span></div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// [START solve]</span></div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  solver.<a class="code" href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html#a4c448eb5e9b767c402d9c3b55ead64f3">init</a>(values, weights, capacities);</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keyword">final</span> <span class="keywordtype">long</span> computedValue = solver.<a class="code" href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html#a86b9400f19838acc60411703ece777c6">solve</a>();</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// [END solve]</span></div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="comment">// [START print_solution]</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  ArrayList<Integer> packedItems = <span class="keyword">new</span> ArrayList<Integer>();</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  ArrayList<Long> packedWeights = <span class="keyword">new</span> ArrayList<Long>();</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">int</span> totalWeight = 0;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  System.out.println(<span class="stringliteral">"Total value = "</span> + computedValue);</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < values.length; i++) {</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">if</span> (solver.<a class="code" href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html#a4289dd15929df6a7b20acbac3f6eae55">bestSolutionContains</a>(i)) {</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  packedItems.add(i);</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  packedWeights.add(weights[0][i]);</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  totalWeight = (int) (totalWeight + weights[0][i]);</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  }</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  }</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  System.out.println(<span class="stringliteral">"Total weight: "</span> + totalWeight);</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  System.out.println(<span class="stringliteral">"Packed items: "</span> + packedItems);</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  System.out.println(<span class="stringliteral">"Packed weights: "</span> + packedWeights);</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="comment">// [END print_solution]</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  }</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div><div class="line"><a name="l00070"></a><span class="lineno"><a class="line" href="classKnapsack.html#a448ef0fd2279d08c3f9dba7d0e8e774c"> 70</a></span>  <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="classKnapsack.html#a448ef0fd2279d08c3f9dba7d0e8e774c">main</a>(String[] args) <span class="keywordflow">throws</span> Exception {</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <a class="code" href="classKnapsack.html">Knapsack</a>.solve();</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  }</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> }</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// [END program]</span></div><div class="ttc" id="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver_html_a86b9400f19838acc60411703ece777c6"><div class="ttname"><a href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html#a86b9400f19838acc60411703ece777c6">com.google.ortools.algorithms.KnapsackSolver.solve</a></div><div class="ttdeci">long solve()</div><div class="ttdef"><b>Definition:</b> <a href="KnapsackSolver_8java_source.html#l00050">KnapsackSolver.java:50</a></div></div>
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<div class="ttc" id="classKnapsack_html_a448ef0fd2279d08c3f9dba7d0e8e774c"><div class="ttname"><a href="classKnapsack.html#a448ef0fd2279d08c3f9dba7d0e8e774c">Knapsack.main</a></div><div class="ttdeci">static void main(String[] args)</div><div class="ttdef"><b>Definition:</b> <a href="Knapsack_8java_source.html#l00070">Knapsack.java:70</a></div></div>
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<div class="ttc" id="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver_html_a4c448eb5e9b767c402d9c3b55ead64f3"><div class="ttname"><a href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html#a4c448eb5e9b767c402d9c3b55ead64f3">com.google.ortools.algorithms.KnapsackSolver.init</a></div><div class="ttdeci">void init(long[] profits, long[][] weights, long[] capacities)</div><div class="ttdef"><b>Definition:</b> <a href="KnapsackSolver_8java_source.html#l00046">KnapsackSolver.java:46</a></div></div>
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<div class="ttc" id="namespacecom_html"><div class="ttname"><a href="namespacecom.html">com</a></div></div>
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<div class="ttc" id="classKnapsack_html"><div class="ttname"><a href="classKnapsack.html">Knapsack</a></div><div class="ttdoc">Sample showing how to model using the knapsack solver.</div><div class="ttdef"><b>Definition:</b> <a href="Knapsack_8java_source.html#l00024">Knapsack.java:24</a></div></div>
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<div class="ttc" id="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver_html_a4289dd15929df6a7b20acbac3f6eae55"><div class="ttname"><a href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html#a4289dd15929df6a7b20acbac3f6eae55">com.google.ortools.algorithms.KnapsackSolver.bestSolutionContains</a></div><div class="ttdeci">boolean bestSolutionContains(int item_id)</div><div class="ttdef"><b>Definition:</b> <a href="KnapsackSolver_8java_source.html#l00054">KnapsackSolver.java:54</a></div></div>
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<div class="ttc" id="enumcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver_1_1SolverType_html"><div class="ttname"><a href="enumcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver_1_1SolverType.html">com.google.ortools.algorithms.KnapsackSolver.SolverType</a></div><div class="ttdef"><b>Definition:</b> <a href="KnapsackSolver_8java_source.html#l00058">KnapsackSolver.java:58</a></div></div>
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<div class="ttc" id="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver_html"><div class="ttname"><a href="classcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver.html">com.google.ortools.algorithms.KnapsackSolver</a></div><div class="ttdef"><b>Definition:</b> <a href="KnapsackSolver_8java_source.html#l00011">KnapsackSolver.java:11</a></div></div>
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<div class="ttc" id="namespacecom_1_1google_1_1ortools_html"><div class="ttname"><a href="namespacecom_1_1google_1_1ortools.html">com.google.ortools</a></div></div>
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<div class="ttc" id="enumcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver_1_1SolverType_html_a01954933c623c5525a6c1cfdfaa05de7"><div class="ttname"><a href="enumcom_1_1google_1_1ortools_1_1algorithms_1_1KnapsackSolver_1_1SolverType.html#a01954933c623c5525a6c1cfdfaa05de7">com.google.ortools.algorithms.KnapsackSolver.SolverType.KNAPSACK_MULTIDIMENSION_BRANCH_AND_BOUND_SOLVER</a></div><div class="ttdeci">KNAPSACK_MULTIDIMENSION_BRANCH_AND_BOUND_SOLVER</div><div class="ttdef"><b>Definition:</b> <a href="KnapsackSolver_8java_source.html#l00063">KnapsackSolver.java:63</a></div></div>
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<div class="ttc" id="namespacecom_1_1google_1_1ortools_1_1algorithms_html"><div class="ttname"><a href="namespacecom_1_1google_1_1ortools_1_1algorithms.html">com.google.ortools.algorithms</a></div><div class="ttdef"><b>Definition:</b> <a href="KnapsackSolver_8java_source.html#l00009">KnapsackSolver.java:9</a></div></div>
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