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311 lines
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<div class="title">implied_bounds.h</div> </div>
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<a href="implied__bounds_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_IMPLIED_BOUNDS_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_IMPLIED_BOUNDS_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 <algorithm></span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <vector></span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="preprocessor">#include "absl/container/flat_hash_map.h"</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="int__type_8h.html">ortools/base/int_type.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="integral__types_8h.html">ortools/base/integral_types.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="base_2logging_8h.html">ortools/base/logging.h</a>"</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "<a class="code" href="strong__vector_8h.html">ortools/base/strong_vector.h</a>"</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "<a class="code" href="integer_8h.html">ortools/sat/integer.h</a>"</span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</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="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include "<a class="code" href="sat__base_8h.html">ortools/sat/sat_base.h</a>"</span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</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="l00029"></a><span class="lineno"> 29</span>  </div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</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="l00031"></a><span class="lineno"> 31</span> <span class="keyword">namespace </span>sat {</div>
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<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  </div>
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<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment">// For each IntegerVariable, the ImpliedBound class allows to list all such</span></div>
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<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// entries.</span></div>
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<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// This is meant to be used in the cut generation code when it make sense: if we</span></div>
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<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// have BoolVar => X >= bound, we can always lower bound the variable X by</span></div>
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<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">// (bound - X_lb) * BoolVar + X_lb, and that can lead to stronger cuts.</span></div>
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<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html"> 39</a></span> <span class="keyword">struct </span><a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html">ImpliedBoundEntry</a> {</div>
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<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="comment">// An integer variable in [0, 1]. When at 1, then the IntegerVariable</span></div>
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<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="comment">// corresponding to this entry must be greater or equal to the given lower</span></div>
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<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="comment">// bound.</span></div>
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<div class="line"><a name="l00043"></a><span class="lineno"><a class="line" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#aeed2f5711a316d7b21a6d36629af958f"> 43</a></span>  IntegerVariable <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#aeed2f5711a316d7b21a6d36629af958f">literal_view</a> = <a class="code" href="namespaceoperations__research_1_1sat.html#a5bd8c44473618b7eafd33ba978db2f06">kNoIntegerVariable</a>;</div>
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<div class="line"><a name="l00044"></a><span class="lineno"><a class="line" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#ac6420aaa41bdee5430eb0bb90df18c9e"> 44</a></span>  IntegerValue <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#ac6420aaa41bdee5430eb0bb90df18c9e">lower_bound</a> = IntegerValue(0);</div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  </div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="comment">// If false, it is when the literal_view is zero that the lower bound is</span></div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="comment">// valid.</span></div>
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<div class="line"><a name="l00048"></a><span class="lineno"><a class="line" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#a6d2822d5e07c3716efcdf73a4ae5eafc"> 48</a></span>  <span class="keywordtype">bool</span> <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#a6d2822d5e07c3716efcdf73a4ae5eafc">is_positive</a> = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  </div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="comment">// These constructors are needed for OR-Tools.</span></div>
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<div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#a9444514145a4699439477891643ac4e2"> 51</a></span>  <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#a9444514145a4699439477891643ac4e2">ImpliedBoundEntry</a>(IntegerVariable lit, IntegerValue lb, <span class="keywordtype">bool</span> positive)</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  : <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#aeed2f5711a316d7b21a6d36629af958f">literal_view</a>(lit), <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#ac6420aaa41bdee5430eb0bb90df18c9e">lower_bound</a>(lb), <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#a6d2822d5e07c3716efcdf73a4ae5eafc">is_positive</a>(positive) {}</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"><a class="line" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#a61c116a72051cf8d1b798d7352f98dbc"> 54</a></span>  <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#a61c116a72051cf8d1b798d7352f98dbc">ImpliedBoundEntry</a>()</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  : <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#aeed2f5711a316d7b21a6d36629af958f">literal_view</a>(<a class="code" href="namespaceoperations__research_1_1sat.html#a5bd8c44473618b7eafd33ba978db2f06">kNoIntegerVariable</a>), <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#ac6420aaa41bdee5430eb0bb90df18c9e">lower_bound</a>(0), <a class="code" href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#a6d2822d5e07c3716efcdf73a4ae5eafc">is_positive</a>(true) {}</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>  </div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="comment">// Maintains all the implications of the form Literal => IntegerLiteral. We</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="comment">// collect these implication at model loading, during probing and during search.</span></div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// TODO(user): This can quickly use up too much memory. Add some limit in place.</span></div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// In particular, each time we have literal => integer_literal we should avoid</span></div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// storing the same integer_literal for all other_literal for which</span></div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// other_literal => literal. For this we need to interact with the</span></div>
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<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// BinaryImplicationGraph.</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment">// TODO(user): This is a bit of a duplicate with the Literal <=> IntegerLiteral</span></div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment">// stored in the IntegerEncoder class. However we only need one side here.</span></div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// TODO(user): Do like in the DomainDeductions class and allow to process</span></div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// clauses (or store them) to perform more level zero deductions. Note that this</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// is again a slight duplicate with what we do there (except that we work at the</span></div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// Domain level in that presolve class).</span></div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="comment">//</span></div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="comment">// TODO(user): Add an implied bound cut generator to add these simple</span></div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// constraints to the LP when needed.</span></div>
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<div class="line"><a name="l00077"></a><span class="lineno"><a class="line" href="classoperations__research_1_1sat_1_1_implied_bounds.html"> 77</a></span> <span class="keyword">class </span><a class="code" href="classoperations__research_1_1sat_1_1_implied_bounds.html">ImpliedBounds</a> {</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keyword">public</span>:</div>
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<div class="line"><a name="l00079"></a><span class="lineno"><a class="line" href="classoperations__research_1_1sat_1_1_implied_bounds.html#a0664b5f76135ba014b22d1be698cdb85"> 79</a></span>  <span class="keyword">explicit</span> <a class="code" href="classoperations__research_1_1sat_1_1_implied_bounds.html#a0664b5f76135ba014b22d1be698cdb85">ImpliedBounds</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="l00080"></a><span class="lineno"> 80</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="l00081"></a><span class="lineno"> 81</span>  sat_solver_(<a class="code" href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a>->GetOrCreate<<a class="code" href="classoperations__research_1_1sat_1_1_sat_solver.html">SatSolver</a>>()),</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  integer_trail_(<a class="code" href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a>->GetOrCreate<<a class="code" href="classoperations__research_1_1sat_1_1_integer_trail.html">IntegerTrail</a>>()),</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  integer_encoder_(<a class="code" href="gurobi__interface_8cc.html#a0728f23c9a47655d38e0bf1a2f200bcf">model</a>->GetOrCreate<<a class="code" href="classoperations__research_1_1sat_1_1_integer_encoder.html">IntegerEncoder</a>>()) {}</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <a class="code" href="classoperations__research_1_1sat_1_1_implied_bounds.html#a524f691e9f750b9f09ae9393c7464dd1">~ImpliedBounds</a>();</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  </div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="comment">// Adds literal => integer_literal to the repository.</span></div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">//</span></div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="comment">// Not that it checks right aways if there is another bound on the same</span></div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="comment">// variable involving literal.Negated(), in which case we can improve the</span></div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="comment">// level zero lower bound of the variable.</span></div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1sat_1_1_implied_bounds.html#a6090e7a5aaf2ae687d3dab6e8ab31cab">Add</a>(<a class="code" href="classoperations__research_1_1sat_1_1_literal.html">Literal</a> <a class="code" href="optimization_8cc.html#af63dcc00f2023fdf498e0829e6fb8a6b">literal</a>, <a class="code" href="structoperations__research_1_1sat_1_1_integer_literal.html">IntegerLiteral</a> integer_literal);</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>  <span class="comment">// This must be called after first_decision has been enqueued and propagated.</span></div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="comment">// It will inspect the trail and add all new implied bounds.</span></div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="comment">//</span></div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="comment">// Preconditions: The decision level must be one (CHECKed). And the decision</span></div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="comment">// must be equal to first decision (we currently do not CHECK that).</span></div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1sat_1_1_implied_bounds.html#af55df3ca81000daf46c6096a71778c40">ProcessIntegerTrail</a>(<a class="code" href="classoperations__research_1_1sat_1_1_literal.html">Literal</a> first_decision);</div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  </div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="comment">// Returns all the implied bounds stored for the given variable.</span></div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="comment">// Note that only literal with an IntegerView are considered here.</span></div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keyword">const</span> std::vector<ImpliedBoundEntry>& <a class="code" href="classoperations__research_1_1sat_1_1_implied_bounds.html#a1abcc20de9ebbf211ba0e97710b4be4d">GetImpliedBounds</a>(IntegerVariable <a class="code" href="expr__array_8cc.html#a472a99923cbe11ae7b5a5d157d9ad465">var</a>);</div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  </div>
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<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">// Returns all the variables for which GetImpliedBounds(var) is not empty. Or</span></div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="comment">// at least that was not empty at some point, because we lazily remove bounds</span></div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="comment">// that become trivial as the search progress.</span></div>
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<div class="line"><a name="l00107"></a><span class="lineno"><a class="line" href="classoperations__research_1_1sat_1_1_implied_bounds.html#ad9f39b33797e085f172b1c042819b213"> 107</a></span>  <span class="keyword">const</span> std::vector<IntegerVariable>& <a class="code" href="classoperations__research_1_1sat_1_1_implied_bounds.html#ad9f39b33797e085f172b1c042819b213">VariablesWithImpliedBounds</a>()<span class="keyword"> const </span>{</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">return</span> has_implied_bounds_.<a class="code" href="classoperations__research_1_1_sparse_bitset.html#a1e5ae9fb14fd6b25919148ae8bbaf050">PositionsSetAtLeastOnce</a>();</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  }</div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  </div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <span class="comment">// Adds to the integer trail all the new level-zero deduction made here.</span></div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// This can only be called at decision level zero. Returns false iff the model</span></div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="comment">// is infeasible.</span></div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordtype">bool</span> <a class="code" href="classoperations__research_1_1sat_1_1_implied_bounds.html#a0e2d0bf17ef8f8ea329a2faec4583377">EnqueueNewDeductions</a>();</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  </div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="comment">// When a literal does not have an integer view, we do not add any</span></div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="comment">// ImpliedBoundEntry. This allows to create missing entries for a literal for</span></div>
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<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="comment">// which a view was just created.</span></div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="comment">//</span></div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="comment">// TODO(user): Implement and call when we create new views in the linear</span></div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="comment">// relaxation.</span></div>
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<div class="line"><a name="l00122"></a><span class="lineno"><a class="line" href="classoperations__research_1_1sat_1_1_implied_bounds.html#a2ae6fb4551f6640de5e5dcabf8930253"> 122</a></span>  <span class="keywordtype">void</span> <a class="code" href="classoperations__research_1_1sat_1_1_implied_bounds.html#a2ae6fb4551f6640de5e5dcabf8930253">NotifyNewIntegerView</a>(<a class="code" href="classoperations__research_1_1sat_1_1_literal.html">Literal</a> <a class="code" href="optimization_8cc.html#af63dcc00f2023fdf498e0829e6fb8a6b">literal</a>) {}</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  </div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keyword">private</span>:</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keyword">const</span> SatParameters& parameters_;</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <a class="code" href="classoperations__research_1_1sat_1_1_sat_solver.html">SatSolver</a>* sat_solver_;</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <a class="code" href="classoperations__research_1_1sat_1_1_integer_trail.html">IntegerTrail</a>* integer_trail_;</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <a class="code" href="classoperations__research_1_1sat_1_1_integer_encoder.html">IntegerEncoder</a>* integer_encoder_;</div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  </div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="comment">// TODO(user): Remove the need for this.</span></div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  std::vector<IntegerLiteral> tmp_integer_literals_;</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  </div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">// For each (Literal, IntegerVariable) the best lower bound implied by this</span></div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="comment">// literal. Note that there is no need to store any entries that do not</span></div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="comment">// improve on the level zero lower bound.</span></div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="comment">//</span></div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="comment">// TODO(user): we could lazily remove old entries to save a bit of space if</span></div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="comment">// many deduction where made at level zero.</span></div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  absl::flat_hash_map<std::pair<LiteralIndex, IntegerVariable>, IntegerValue></div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  bounds_;</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  </div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="comment">// Note(user): The plan is to use these during cut generation, so only the</span></div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="comment">// Literal with an IntegerView that can be used in the LP relaxation need to</span></div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="comment">// be kept here.</span></div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">//</span></div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="comment">// TODO(user): Use inlined vectors.</span></div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  std::vector<ImpliedBoundEntry> empty_implied_bounds_;</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <a class="code" href="classabsl_1_1_strong_vector.html">absl::StrongVector<IntegerVariable, std::vector<ImpliedBoundEntry></a>></div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  var_to_bounds_;</div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  </div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  <span class="comment">// Track the list of variables with some implied bounds.</span></div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <a class="code" href="classoperations__research_1_1_sparse_bitset.html">SparseBitset<IntegerVariable></a> has_implied_bounds_;</div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  </div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="comment">// TODO(user): Ideally, this should go away if we manage to push level-zero</span></div>
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<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="comment">// fact at a positive level directly.</span></div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <a class="code" href="classabsl_1_1_strong_vector.html">absl::StrongVector<IntegerVariable, IntegerValue></a> level_zero_lower_bounds_;</div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <a class="code" href="classoperations__research_1_1_sparse_bitset.html">SparseBitset<IntegerVariable></a> new_level_zero_bounds_;</div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  </div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">// Stats.</span></div>
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <a class="code" href="integral__types_8h.html#a7cde0074dfd288f2d70c0e035dacb28a">int64</a> num_deductions_ = 0;</div>
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <a class="code" href="integral__types_8h.html#a7cde0074dfd288f2d70c0e035dacb28a">int64</a> num_enqueued_in_var_to_bounds_ = 0;</div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span> };</div>
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  </div>
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> } <span class="comment">// namespace sat</span></div>
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> } <span class="comment">// namespace operations_research</span></div>
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<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  </div>
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<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="preprocessor">#endif </span><span class="comment">// OR_TOOLS_SAT_IMPLIED_BOUNDS_H_</span></div>
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<div class="ttc" id="abase_2logging_8h_html"><div class="ttname"><a href="base_2logging_8h.html">logging.h</a></div></div>
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<div class="ttc" id="abitset_8h_html"><div class="ttname"><a href="bitset_8h.html">bitset.h</a></div></div>
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<div class="ttc" id="aclassabsl_1_1_strong_vector_html"><div class="ttname"><a href="classabsl_1_1_strong_vector.html">absl::StrongVector</a></div><div class="ttdef"><b>Definition:</b> <a href="strong__vector_8h_source.html#l00076">strong_vector.h:76</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1_sparse_bitset_html"><div class="ttname"><a href="classoperations__research_1_1_sparse_bitset.html">operations_research::SparseBitset< IntegerVariable ></a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1_sparse_bitset_html_a1e5ae9fb14fd6b25919148ae8bbaf050"><div class="ttname"><a href="classoperations__research_1_1_sparse_bitset.html#a1e5ae9fb14fd6b25919148ae8bbaf050">operations_research::SparseBitset::PositionsSetAtLeastOnce</a></div><div class="ttdeci">const std::vector< IntegerType > & PositionsSetAtLeastOnce() const</div><div class="ttdef"><b>Definition:</b> <a href="bitset_8h_source.html#l00815">bitset.h:815</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_implied_bounds_html"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_implied_bounds.html">operations_research::sat::ImpliedBounds</a></div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8h_source.html#l00077">implied_bounds.h:77</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_implied_bounds_html_a0664b5f76135ba014b22d1be698cdb85"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_implied_bounds.html#a0664b5f76135ba014b22d1be698cdb85">operations_research::sat::ImpliedBounds::ImpliedBounds</a></div><div class="ttdeci">ImpliedBounds(Model *model)</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8h_source.html#l00079">implied_bounds.h:79</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_implied_bounds_html_a0e2d0bf17ef8f8ea329a2faec4583377"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_implied_bounds.html#a0e2d0bf17ef8f8ea329a2faec4583377">operations_research::sat::ImpliedBounds::EnqueueNewDeductions</a></div><div class="ttdeci">bool EnqueueNewDeductions()</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8cc_source.html#l00180">implied_bounds.cc:180</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_implied_bounds_html_a1abcc20de9ebbf211ba0e97710b4be4d"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_implied_bounds.html#a1abcc20de9ebbf211ba0e97710b4be4d">operations_research::sat::ImpliedBounds::GetImpliedBounds</a></div><div class="ttdeci">const std::vector< ImpliedBoundEntry > & GetImpliedBounds(IntegerVariable var)</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8cc_source.html#l00147">implied_bounds.cc:147</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_implied_bounds_html_a2ae6fb4551f6640de5e5dcabf8930253"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_implied_bounds.html#a2ae6fb4551f6640de5e5dcabf8930253">operations_research::sat::ImpliedBounds::NotifyNewIntegerView</a></div><div class="ttdeci">void NotifyNewIntegerView(Literal literal)</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8h_source.html#l00122">implied_bounds.h:122</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_implied_bounds_html_a524f691e9f750b9f09ae9393c7464dd1"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_implied_bounds.html#a524f691e9f750b9f09ae9393c7464dd1">operations_research::sat::ImpliedBounds::~ImpliedBounds</a></div><div class="ttdeci">~ImpliedBounds()</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8cc_source.html#l00020">implied_bounds.cc:20</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_implied_bounds_html_a6090e7a5aaf2ae687d3dab6e8ab31cab"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_implied_bounds.html#a6090e7a5aaf2ae687d3dab6e8ab31cab">operations_research::sat::ImpliedBounds::Add</a></div><div class="ttdeci">void Add(Literal literal, IntegerLiteral integer_literal)</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8cc_source.html#l00027">implied_bounds.cc:27</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_implied_bounds_html_ad9f39b33797e085f172b1c042819b213"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_implied_bounds.html#ad9f39b33797e085f172b1c042819b213">operations_research::sat::ImpliedBounds::VariablesWithImpliedBounds</a></div><div class="ttdeci">const std::vector< IntegerVariable > & VariablesWithImpliedBounds() const</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8h_source.html#l00107">implied_bounds.h:107</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_implied_bounds_html_af55df3ca81000daf46c6096a71778c40"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_implied_bounds.html#af55df3ca81000daf46c6096a71778c40">operations_research::sat::ImpliedBounds::ProcessIntegerTrail</a></div><div class="ttdeci">void ProcessIntegerTrail(Literal first_decision)</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8cc_source.html#l00169">implied_bounds.cc:169</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_integer_encoder_html"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_integer_encoder.html">operations_research::sat::IntegerEncoder</a></div><div class="ttdef"><b>Definition:</b> <a href="integer_8h_source.html#l00276">integer.h:276</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_integer_trail_html"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_integer_trail.html">operations_research::sat::IntegerTrail</a></div><div class="ttdef"><b>Definition:</b> <a href="integer_8h_source.html#l00540">integer.h:540</a></div></div>
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<div class="ttc" id="aclassoperations__research_1_1sat_1_1_literal_html"><div class="ttname"><a href="classoperations__research_1_1sat_1_1_literal.html">operations_research::sat::Literal</a></div><div class="ttdef"><b>Definition:</b> <a href="sat__base_8h_source.html#l00064">sat_base.h:64</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_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#l00057">sat_solver.h:57</a></div></div>
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<div class="ttc" id="anamespaceoperations__research_1_1sat_html_a5bd8c44473618b7eafd33ba978db2f06"><div class="ttname"><a href="namespaceoperations__research_1_1sat.html#a5bd8c44473618b7eafd33ba978db2f06">operations_research::sat::kNoIntegerVariable</a></div><div class="ttdeci">const IntegerVariable kNoIntegerVariable(-1)</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="aoptimization_8cc_html_af63dcc00f2023fdf498e0829e6fb8a6b"><div class="ttname"><a href="optimization_8cc.html#af63dcc00f2023fdf498e0829e6fb8a6b">literal</a></div><div class="ttdeci">Literal literal</div><div class="ttdef"><b>Definition:</b> <a href="optimization_8cc_source.html#l00084">optimization.cc:84</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1sat_1_1_implied_bound_entry_html_a6d2822d5e07c3716efcdf73a4ae5eafc"><div class="ttname"><a href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#a6d2822d5e07c3716efcdf73a4ae5eafc">operations_research::sat::ImpliedBoundEntry::is_positive</a></div><div class="ttdeci">bool is_positive</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8h_source.html#l00048">implied_bounds.h:48</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1sat_1_1_implied_bound_entry_html_a9444514145a4699439477891643ac4e2"><div class="ttname"><a href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#a9444514145a4699439477891643ac4e2">operations_research::sat::ImpliedBoundEntry::ImpliedBoundEntry</a></div><div class="ttdeci">ImpliedBoundEntry(IntegerVariable lit, IntegerValue lb, bool positive)</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8h_source.html#l00051">implied_bounds.h:51</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1sat_1_1_implied_bound_entry_html_ac6420aaa41bdee5430eb0bb90df18c9e"><div class="ttname"><a href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#ac6420aaa41bdee5430eb0bb90df18c9e">operations_research::sat::ImpliedBoundEntry::lower_bound</a></div><div class="ttdeci">IntegerValue lower_bound</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8h_source.html#l00044">implied_bounds.h:44</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1sat_1_1_implied_bound_entry_html_aeed2f5711a316d7b21a6d36629af958f"><div class="ttname"><a href="structoperations__research_1_1sat_1_1_implied_bound_entry.html#aeed2f5711a316d7b21a6d36629af958f">operations_research::sat::ImpliedBoundEntry::literal_view</a></div><div class="ttdeci">IntegerVariable literal_view</div><div class="ttdef"><b>Definition:</b> <a href="implied__bounds_8h_source.html#l00043">implied_bounds.h:43</a></div></div>
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<div class="ttc" id="astructoperations__research_1_1sat_1_1_integer_literal_html"><div class="ttname"><a href="structoperations__research_1_1sat_1_1_integer_literal.html">operations_research::sat::IntegerLiteral</a></div><div class="ttdef"><b>Definition:</b> <a href="integer_8h_source.html#l00153">integer.h:153</a></div></div>
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