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203 lines
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<div class="headertitle"><div class="title">complete_optimizer.h</div></div>
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<a href="complete__optimizer_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// Copyright 2010-2021 Google LLC</span></div>
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<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// Licensed under the Apache License, Version 2.0 (the "License");</span></div>
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<div class="line"><a id="l00003" 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>
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<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment">// You may obtain a copy of the License at</span></div>
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<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment">//</span></div>
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<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div>
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<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment">//</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment">// distributed under the License is distributed on an "AS IS" BASIS,</span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
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<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment">// See the License for the specific language governing permissions and</span></div>
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<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment">// limitations under the License.</span></div>
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<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span> </div>
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<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment">// This file contains some BopOptimizerBase implementations that are "complete"</span></div>
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<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment">// solvers. That is, they work on the full problem, and can solve the problem</span></div>
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment">// (and prove optimality) by themselves. Moreover, they can be run for short</span></div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment">// period of time and resumed later from the state they where left off.</span></div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment">//</span></div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment">// The idea is that it is worthwhile spending some time in these algorithms,</span></div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment">// because in some situation they can improve the current upper/lower bound or</span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="comment">// even solve the problem to optimality.</span></div>
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<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="comment">//</span></div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment">// Note(user): The GuidedSatFirstSolutionGenerator can also be used as a</span></div>
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<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="comment">// complete SAT solver provided that we keep running it after it has found a</span></div>
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<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="comment">// first solution. This is the default behavior of the kNotGuided policy.</span></div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span> </div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="preprocessor">#ifndef OR_TOOLS_BOP_COMPLETE_OPTIMIZER_H_</span></div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="preprocessor">#define OR_TOOLS_BOP_COMPLETE_OPTIMIZER_H_</span></div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> </div>
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="preprocessor">#include <cstdint></span></div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#include <deque></span></div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> </div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="preprocessor">#include "<a class="code" href="bop__base_8h.html">ortools/bop/bop_base.h</a>"</span></div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="preprocessor">#include "<a class="code" href="bop__solution_8h.html">ortools/bop/bop_solution.h</a>"</span></div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="preprocessor">#include "<a class="code" href="bop__types_8h.html">ortools/bop/bop_types.h</a>"</span></div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="preprocessor">#include "ortools/sat/boolean_problem.pb.h"</span></div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="preprocessor">#include "<a class="code" href="encoding_8h.html">ortools/sat/encoding.h</a>"</span></div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="preprocessor">#include "<a class="code" href="sat__solver_8h.html">ortools/sat/sat_solver.h</a>"</span></div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> </div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceoperations__research.html">operations_research</a> {</div>
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="keyword">namespace </span>bop {</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> </div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment">// TODO(user): Merge this with the code in sat/optimization.cc</span></div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"><a class="line" href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html"> 44</a></span><span class="keyword">class </span><a class="code hl_class" href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html">SatCoreBasedOptimizer</a> : <span class="keyword">public</span> <a class="code hl_class" href="classoperations__research_1_1bop_1_1_bop_optimizer_base.html">BopOptimizerBase</a> {</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="keyword">public</span>:</div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> <span class="keyword">explicit</span> <a class="code hl_function" href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html#aeffc35852c293ffd40548c5a768c01cf">SatCoreBasedOptimizer</a>(<span class="keyword">const</span> std::string& <a class="code hl_function" href="classoperations__research_1_1bop_1_1_bop_optimizer_base.html#a24dcbf29c0d6cd766009a182a6484e3b">name</a>);</div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <a class="code hl_function" href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html#a07b11a8080040c4fb7cf9d098992468e">~SatCoreBasedOptimizer</a>() <span class="keyword">override</span>;</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> </div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="keyword">protected</span>:</div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html#a333c05e80843ee46f4428d3e6482b17e">ShouldBeRun</a>(<span class="keyword">const</span> <a class="code hl_class" href="classoperations__research_1_1bop_1_1_problem_state.html">ProblemState</a>& problem_state) <span class="keyword">const override</span>;</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <a class="code hl_enumeration" href="classoperations__research_1_1bop_1_1_bop_optimizer_base.html#a67a0db04d321a74b7e7fcfd3f1a3f70b">Status</a> <a class="code hl_function" href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html#a8330ac820f311aab1b9c2c8057cc2c3f">Optimize</a>(<span class="keyword">const</span> BopParameters& <a class="code hl_variable" href="cp__model__fz__solver_8cc.html#a10a1eab179b472c030bdc2a2efef7219">parameters</a>,</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="keyword">const</span> <a class="code hl_class" href="classoperations__research_1_1bop_1_1_problem_state.html">ProblemState</a>& problem_state, <a class="code hl_struct" href="structoperations__research_1_1bop_1_1_learned_info.html">LearnedInfo</a>* learned_info,</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <a class="code hl_class" href="classoperations__research_1_1_time_limit.html">TimeLimit</a>* <a class="code hl_variable" href="cp__model__solver_8cc.html#aec8af5c1be4e1b6d4330e1161028de21">time_limit</a>) <span class="keyword">override</span>;</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> </div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">private</span>:</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <a class="code hl_enumeration" href="classoperations__research_1_1bop_1_1_bop_optimizer_base.html#a67a0db04d321a74b7e7fcfd3f1a3f70b">BopOptimizerBase::Status</a> SynchronizeIfNeeded(</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> <span class="keyword">const</span> <a class="code hl_class" href="classoperations__research_1_1bop_1_1_problem_state.html">ProblemState</a>& problem_state);</div>
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<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> <a class="code hl_enumeration" href="classoperations__research_1_1sat_1_1_sat_solver.html#a67a0db04d321a74b7e7fcfd3f1a3f70b">sat::SatSolver::Status</a> SolveWithAssumptions();</div>
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<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> </div>
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<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> int64_t state_update_stamp_;</div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="keywordtype">bool</span> initialized_;</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="keywordtype">bool</span> assumptions_already_added_;</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <a class="code hl_class" href="classoperations__research_1_1sat_1_1_sat_solver.html">sat::SatSolver</a> solver_;</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <a class="code hl_typedef" href="namespaceoperations__research_1_1math__opt.html#ab61209db5b13f0d424da009e414298fc">sat::Coefficient</a> offset_;</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <a class="code hl_typedef" href="namespaceoperations__research_1_1math__opt.html#ab61209db5b13f0d424da009e414298fc">sat::Coefficient</a> lower_bound_;</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <a class="code hl_typedef" href="namespaceoperations__research_1_1math__opt.html#ab61209db5b13f0d424da009e414298fc">sat::Coefficient</a> upper_bound_;</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <a class="code hl_typedef" href="namespaceoperations__research_1_1math__opt.html#ab61209db5b13f0d424da009e414298fc">sat::Coefficient</a> stratified_lower_bound_;</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> std::deque<sat::EncodingNode> repository_;</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> std::vector<sat::EncodingNode*> nodes_;</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span>};</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> </div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span>} <span class="comment">// namespace bop</span></div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span>} <span class="comment">// namespace operations_research</span></div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> </div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><span class="preprocessor">#endif </span><span class="comment">// OR_TOOLS_BOP_COMPLETE_OPTIMIZER_H_</span></div>
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<div class="ttc" id="abop__base_8h_html"><div class="ttname"><a href="bop__base_8h.html">bop_base.h</a></div></div>
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<div class="ttc" id="abop__solution_8h_html"><div class="ttname"><a href="bop__solution_8h.html">bop_solution.h</a></div></div>
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<div class="ttc" id="abop__types_8h_html"><div class="ttname"><a href="bop__types_8h.html">bop_types.h</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1_time_limit_html"><div class="ttname"><a href="classoperations__research_1_1_time_limit.html">operations_research::TimeLimit</a></div><div class="ttdoc">A simple class to enforce both an elapsed time limit and a deterministic time limit in the same threa...</div><div class="ttdef"><b>Definition:</b> <a href="time__limit_8h_source.html#l00106">time_limit.h:106</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1bop_1_1_bop_optimizer_base_html"><div class="ttname"><a href="classoperations__research_1_1bop_1_1_bop_optimizer_base.html">operations_research::bop::BopOptimizerBase</a></div><div class="ttdef"><b>Definition:</b> <a href="bop__base_8h_source.html#l00043">bop_base.h:43</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1bop_1_1_bop_optimizer_base_html_a24dcbf29c0d6cd766009a182a6484e3b"><div class="ttname"><a href="classoperations__research_1_1bop_1_1_bop_optimizer_base.html#a24dcbf29c0d6cd766009a182a6484e3b">operations_research::bop::BopOptimizerBase::name</a></div><div class="ttdeci">const std::string & name() const</div><div class="ttdef"><b>Definition:</b> <a href="bop__base_8h_source.html#l00049">bop_base.h:49</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1bop_1_1_bop_optimizer_base_html_a67a0db04d321a74b7e7fcfd3f1a3f70b"><div class="ttname"><a href="classoperations__research_1_1bop_1_1_bop_optimizer_base.html#a67a0db04d321a74b7e7fcfd3f1a3f70b">operations_research::bop::BopOptimizerBase::Status</a></div><div class="ttdeci">Status</div><div class="ttdef"><b>Definition:</b> <a href="bop__base_8h_source.html#l00064">bop_base.h:64</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1bop_1_1_problem_state_html"><div class="ttname"><a href="classoperations__research_1_1bop_1_1_problem_state.html">operations_research::bop::ProblemState</a></div><div class="ttdef"><b>Definition:</b> <a href="bop__base_8h_source.html#l00114">bop_base.h:114</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1bop_1_1_sat_core_based_optimizer_html"><div class="ttname"><a href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html">operations_research::bop::SatCoreBasedOptimizer</a></div><div class="ttdef"><b>Definition:</b> <a href="complete__optimizer_8h_source.html#l00044">complete_optimizer.h:44</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1bop_1_1_sat_core_based_optimizer_html_a07b11a8080040c4fb7cf9d098992468e"><div class="ttname"><a href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html#a07b11a8080040c4fb7cf9d098992468e">operations_research::bop::SatCoreBasedOptimizer::~SatCoreBasedOptimizer</a></div><div class="ttdeci">~SatCoreBasedOptimizer() override</div><div class="ttdef"><b>Definition:</b> <a href="complete__optimizer_8cc_source.html#l00034">complete_optimizer.cc:34</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1bop_1_1_sat_core_based_optimizer_html_a333c05e80843ee46f4428d3e6482b17e"><div class="ttname"><a href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html#a333c05e80843ee46f4428d3e6482b17e">operations_research::bop::SatCoreBasedOptimizer::ShouldBeRun</a></div><div class="ttdeci">bool ShouldBeRun(const ProblemState &problem_state) const override</div><div class="ttdef"><b>Definition:</b> <a href="complete__optimizer_8cc_source.html#l00078">complete_optimizer.cc:78</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1bop_1_1_sat_core_based_optimizer_html_a8330ac820f311aab1b9c2c8057cc2c3f"><div class="ttname"><a href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html#a8330ac820f311aab1b9c2c8057cc2c3f">operations_research::bop::SatCoreBasedOptimizer::Optimize</a></div><div class="ttdeci">Status Optimize(const BopParameters &parameters, const ProblemState &problem_state, LearnedInfo *learned_info, TimeLimit *time_limit) override</div><div class="ttdef"><b>Definition:</b> <a href="complete__optimizer_8cc_source.html#l00083">complete_optimizer.cc:83</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1bop_1_1_sat_core_based_optimizer_html_aeffc35852c293ffd40548c5a768c01cf"><div class="ttname"><a href="classoperations__research_1_1bop_1_1_sat_core_based_optimizer.html#aeffc35852c293ffd40548c5a768c01cf">operations_research::bop::SatCoreBasedOptimizer::SatCoreBasedOptimizer</a></div><div class="ttdeci">SatCoreBasedOptimizer(const std::string &name)</div><div class="ttdef"><b>Definition:</b> <a href="complete__optimizer_8cc_source.html#l00024">complete_optimizer.cc:24</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_sat_solver_html"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_sat_solver.html">operations_research::sat::SatSolver</a></div><div class="ttdef"><b>Definition:</b> <a href="sat__solver_8h_source.html#l00061">sat_solver.h:61</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_sat_solver_html_a67a0db04d321a74b7e7fcfd3f1a3f70b"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_sat_solver.html#a67a0db04d321a74b7e7fcfd3f1a3f70b">operations_research::sat::SatSolver::Status</a></div><div class="ttdeci">Status</div><div class="ttdef"><b>Definition:</b> <a href="sat__solver_8h_source.html#l00183">sat_solver.h:183</a></div></div>
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<div class="ttc" id="acp__model__fz__solver_8cc_html_a10a1eab179b472c030bdc2a2efef7219"><div class="ttname"><a href="cp__model__fz__solver_8cc.html#a10a1eab179b472c030bdc2a2efef7219">parameters</a></div><div class="ttdeci">SatParameters parameters</div><div class="ttdef"><b>Definition:</b> <a href="cp__model__fz__solver_8cc_source.html#l00119">cp_model_fz_solver.cc:119</a></div></div>
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<div class="ttc" id="acp__model__solver_8cc_html_aec8af5c1be4e1b6d4330e1161028de21"><div class="ttname"><a href="cp__model__solver_8cc.html#aec8af5c1be4e1b6d4330e1161028de21">time_limit</a></div><div class="ttdeci">ModelSharedTimeLimit * time_limit</div><div class="ttdef"><b>Definition:</b> <a href="cp__model__solver_8cc_source.html#l02050">cp_model_solver.cc:2050</a></div></div>
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<div class="ttc" id="aencoding_8h_html"><div class="ttname"><a href="encoding_8h.html">encoding.h</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_1_1math__opt_html_ab61209db5b13f0d424da009e414298fc"><div class="ttname"><a href="namespaceoperations__research_1_1math__opt.html#ab61209db5b13f0d424da009e414298fc">operations_research::math_opt::Coefficient</a></div><div class="ttdeci">std::tuple< int64_t, int64_t, const double > Coefficient</div><div class="ttdef"><b>Definition:</b> <a href="sparse__collection__matchers_8h_source.html#l00061">sparse_collection_matchers.h:61</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_html"><div class="ttname"><a href="namespaceoperations__research.html">operations_research</a></div><div class="ttdoc">Collection of objects used to extend the Constraint Solver library.</div><div class="ttdef"><b>Definition:</b> <a href="dense__doubly__linked__list_8h_source.html#l00021">dense_doubly_linked_list.h:21</a></div></div>
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<div class="ttc" id="asat__solver_8h_html"><div class="ttname"><a href="sat__solver_8h.html">sat_solver.h</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1bop_1_1_learned_info_html"><div class="ttname"><a href="structoperations__research_1_1bop_1_1_learned_info.html">operations_research::bop::LearnedInfo</a></div><div class="ttdef"><b>Definition:</b> <a href="bop__base_8h_source.html#l00248">bop_base.h:248</a></div></div>
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