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<div class="title">restart.h</div> </div>
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<a href="restart_8h.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>
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<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>
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<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>
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<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>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment">//</span></div>
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<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>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">//</span></div>
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<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>
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<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>
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<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>
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<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>
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<div class="line"><a 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 name="l00013"></a><span class="lineno"> 13</span>  </div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#ifndef OR_TOOLS_SAT_RESTART_H_</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#define OR_TOOLS_SAT_RESTART_H_</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>  </div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <vector></span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>  </div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="preprocessor">#include "<a class="code" href="sat_2model_8h.html">ortools/sat/model.h</a>"</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include "<a class="code" href="sat__decision_8h.html">ortools/sat/sat_decision.h</a>"</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor">#include "<a class="code" href="sat__parameters_8pb_8h.html">ortools/sat/sat_parameters.pb.h</a>"</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#include "<a class="code" href="bitset_8h.html">ortools/util/bitset.h</a>"</span></div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "<a class="code" href="running__stat_8h.html">ortools/util/running_stat.h</a>"</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  </div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="keyword">namespace </span><a class="code" href="namespaceoperations__research.html">operations_research</a> {</div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keyword">namespace </span>sat {</div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  </div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// Contain the logic to decide when to restart a SAT tree search.</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"><a class="line" href="classoperations__research_1_1sat_1_1_restart_policy.html"> 29</a></span> <span class="keyword">class </span><a class="code" href="classoperations__research_1_1sat_1_1_restart_policy.html">RestartPolicy</a> {</div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="classoperations__research_1_1sat_1_1_restart_policy.html#a9e7b052f019c35f495540b10825bd183"> 31</a></span>  <span class="keyword">explicit</span> <a class="code" href="classoperations__research_1_1sat_1_1_restart_policy.html#a9e7b052f019c35f495540b10825bd183">RestartPolicy</a>(<a class="code" href="classoperations__research_1_1sat_1_1_model.html">Model</a>* <a class="code" href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a>)</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  : parameters_(*(<a class="code" href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a>->GetOrCreate<SatParameters>())),</div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  decision_policy_(<a class="code" href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a>->GetOrCreate<<a class="code" href="classoperations__research_1_1sat_1_1_sat_decision_policy.html">SatDecisionPolicy</a>>()) {</div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <a class="code" href="classoperations__research_1_1sat_1_1_restart_policy.html#a372de693ad40b3f42839c8ec6ac845f4">Reset</a>();</div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  }</div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  </div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="comment">// Resets the policy using the current model parameters.</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1sat_1_1_restart_policy.html#a372de693ad40b3f42839c8ec6ac845f4">Reset</a>();</div>
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<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  </div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="comment">// Returns true if the solver should be restarted before the next decision is</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="comment">// taken. Note that this will return true just once and then assumes that</span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">// the search was restarted and starts worrying about the next restart.</span></div>
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<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  <span class="keywordtype">bool</span> <a class="code" href="classoperations__research_1_1sat_1_1_restart_policy.html#a9a4dbc2c6849f437d4f08288eeffbfed">ShouldRestart</a>();</div>
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<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  </div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="comment">// This will be called by the solver engine after each conflict. The arguments</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="comment">// reflect the state of the solver when the conflict was detected and before</span></div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// the backjump.</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1sat_1_1_restart_policy.html#a6656a848070cf8e91a9af92feee0477c">OnConflict</a>(<span class="keywordtype">int</span> conflict_trail_index, <span class="keywordtype">int</span> conflict_decision_level,</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordtype">int</span> conflict_lbd);</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="comment">// Returns the number of restarts since the last Reset().</span></div>
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<div class="line"><a name="l00052"></a><span class="lineno"><a class="line" href="classoperations__research_1_1sat_1_1_restart_policy.html#aea2ab8041aa76772ba75a3ca8c2cfd81"> 52</a></span>  <span class="keywordtype">int</span> <a class="code" href="classoperations__research_1_1sat_1_1_restart_policy.html#aea2ab8041aa76772ba75a3ca8c2cfd81">NumRestarts</a>()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> num_restarts_; }</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  </div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="comment">// Returns a string with the current restart statistics.</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  std::string <a class="code" href="classoperations__research_1_1sat_1_1_restart_policy.html#a3b30aa3a72ace837ddc29fd371c6e46e">InfoString</a>() <span class="keyword">const</span>;</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  </div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keyword">const</span> SatParameters& parameters_;</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="classoperations__research_1_1sat_1_1_sat_decision_policy.html">SatDecisionPolicy</a>* decision_policy_;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  </div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">int</span> num_restarts_;</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordtype">int</span> conflicts_until_next_strategy_change_;</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keywordtype">int</span> strategy_change_conflicts_;</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  </div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  <span class="keywordtype">int</span> strategy_counter_;</div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  std::vector<SatParameters::RestartAlgorithm> strategies_;</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  </div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <span class="keywordtype">int</span> luby_count_;</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordtype">int</span> conflicts_until_next_restart_;</div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  </div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <a class="code" href="classoperations__research_1_1_running_average.html">RunningAverage</a> dl_running_average_;</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <a class="code" href="classoperations__research_1_1_running_average.html">RunningAverage</a> lbd_running_average_;</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <a class="code" href="classoperations__research_1_1_running_average.html">RunningAverage</a> trail_size_running_average_;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> };</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  </div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// Returns the ith element of the strategy S^univ proposed by M. Luby et al. in</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// Optimal Speedup of Las Vegas Algorithms, Information Processing Letters 1993.</span></div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="comment">// This is used to decide the number of conflicts allowed before the next</span></div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="comment">// restart. This method, used by most SAT solvers, is usually referenced as</span></div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">// Luby.</span></div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// Returns 2^{k-1} when i == 2^k - 1</span></div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="comment">// and SUniv(i - 2^{k-1} + 1) when 2^{k-1} <= i < 2^k - 1.</span></div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="comment">// The sequence is defined for i > 0 and starts with:</span></div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">// {1, 1, 2, 1, 1, 2, 4, 1, 1, 2, 1, 1, 2, 4, 8, ...}</span></div>
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<div class="line"><a name="l00085"></a><span class="lineno"><a class="line" href="namespaceoperations__research_1_1sat.html#ab89c95fd9e5fe8176a7807d92872972e"> 85</a></span> <span class="keyword">inline</span> <span class="keywordtype">int</span> <a class="code" href="namespaceoperations__research_1_1sat.html#ab89c95fd9e5fe8176a7807d92872972e">SUniv</a>(<span class="keywordtype">int</span> i) {</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  DCHECK_GT(i, 0);</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">while</span> (i > 2) {</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keyword">const</span> <span class="keywordtype">int</span> most_significant_bit_position =</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <a class="code" href="namespaceoperations__research.html#a2f9ef253c023106392eb1495a277616b">MostSignificantBitPosition64</a>(i + 1);</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">if</span> ((1 << most_significant_bit_position) == i + 1) {</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">return</span> 1 << (most_significant_bit_position - 1);</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  }</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  i -= (1 << most_significant_bit_position) - 1;</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  }</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordflow">return</span> 1;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span> }</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  </div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> } <span class="comment">// namespace sat</span></div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> } <span class="comment">// namespace operations_research</span></div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  </div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="preprocessor">#endif // OR_TOOLS_SAT_RESTART_H_</span></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_restart_policy_html_a9a4dbc2c6849f437d4f08288eeffbfed"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_restart_policy.html#a9a4dbc2c6849f437d4f08288eeffbfed">operations_research::sat::RestartPolicy::ShouldRestart</a></div><div class="ttdeci">bool ShouldRestart()</div><div class="ttdef"><b>Definition:</b> <a href="restart_8cc_source.html#l00081">restart.cc:81</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_restart_policy_html"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_restart_policy.html">operations_research::sat::RestartPolicy</a></div><div class="ttdef"><b>Definition:</b> <a href="restart_8h_source.html#l00029">restart.h:29</a></div></div>
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<div class="ttc" id="asat_2model_8h_html"><div class="ttname"><a href="sat_2model_8h.html">model.h</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">The vehicle routing library lets one model and solve generic vehicle routing problems ranging from th...</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="aclassoperations__research_1_1sat_1_1_restart_policy_html_aea2ab8041aa76772ba75a3ca8c2cfd81"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_restart_policy.html#aea2ab8041aa76772ba75a3ca8c2cfd81">operations_research::sat::RestartPolicy::NumRestarts</a></div><div class="ttdeci">int NumRestarts() const</div><div class="ttdef"><b>Definition:</b> <a href="restart_8h_source.html#l00052">restart.h:52</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_restart_policy_html_a9e7b052f019c35f495540b10825bd183"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_restart_policy.html#a9e7b052f019c35f495540b10825bd183">operations_research::sat::RestartPolicy::RestartPolicy</a></div><div class="ttdeci">RestartPolicy(Model *model)</div><div class="ttdef"><b>Definition:</b> <a href="restart_8h_source.html#l00031">restart.h:31</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_1_1sat_html_ab89c95fd9e5fe8176a7807d92872972e"><div class="ttname"><a href="namespaceoperations__research_1_1sat.html#ab89c95fd9e5fe8176a7807d92872972e">operations_research::sat::SUniv</a></div><div class="ttdeci">int SUniv(int i)</div><div class="ttdef"><b>Definition:</b> <a href="restart_8h_source.html#l00085">restart.h:85</a></div></div>
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<div class="ttc" id="asat__parameters_8pb_8h_html"><div class="ttname"><a href="sat__parameters_8pb_8h.html">sat_parameters.pb.h</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_model_html"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_model.html">operations_research::sat::Model</a></div><div class="ttdoc">Class that owns everything related to a particular optimization model.</div><div class="ttdef"><b>Definition:</b> <a href="sat_2model_8h_source.html#l00038">sat/model.h:38</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_sat_decision_policy_html"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_sat_decision_policy.html">operations_research::sat::SatDecisionPolicy</a></div><div class="ttdef"><b>Definition:</b> <a href="sat__decision_8h_source.html#l00034">sat_decision.h:34</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_html_a2f9ef253c023106392eb1495a277616b"><div class="ttname"><a href="namespaceoperations__research.html#a2f9ef253c023106392eb1495a277616b">operations_research::MostSignificantBitPosition64</a></div><div class="ttdeci">int MostSignificantBitPosition64(uint64 n)</div><div class="ttdef"><b>Definition:</b> <a href="bitset_8h_source.html#l00231">bitset.h:231</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_restart_policy_html_a3b30aa3a72ace837ddc29fd371c6e46e"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_restart_policy.html#a3b30aa3a72ace837ddc29fd371c6e46e">operations_research::sat::RestartPolicy::InfoString</a></div><div class="ttdeci">std::string InfoString() const</div><div class="ttdef"><b>Definition:</b> <a href="restart_8cc_source.html#l00173">restart.cc:173</a></div></div>
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<div class="ttc" id="agurobi__interface_8cc_html_a0728f23c9a47655d38e0bf1a2f200bcf"><div class="ttname"><a href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a></div><div class="ttdeci">GRBmodel * model</div><div class="ttdef"><b>Definition:</b> <a href="gurobi__interface_8cc_source.html#l00195">gurobi_interface.cc:195</a></div></div>
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